Overview:

The Terahertz region of the electromagnetic spectrum, which spans from 300 GHz to 10 THz, has attracted a lot of attention in recent years due to potential applications in the commercial, scientific, and government arenas. The following list is just a sample of the areas where terahertz imaging and sensing can yield new technical capability and new business opportunities:

• Food and Medicine: Mammography, Dentistry (detection of tooth decay), Medical diagnostics (early detection of skin cancer, bone density), Endoscopy, Food industry process control (moisture detection), Pharmaceutical process control (pill inspection)

• Government: Home land Security - concealed weapon identification, detection of suicide bombers, biological threat detection, NASA - detection of voids in the space shuttle foam, Air Force - high rate and secure data transfer, flame analysis (rocket or jet engine burn optimization), Army - seeing through sand storms, TSA - passenger screening, hidden weapons detection, contraband detection

• Scientific: Earth remote sensing, Astrophysics (THz astronomy), Chemistry, Environmental sensing (pollution detection), Plasma diagnostics, Biochemistry (DNA analysis)

The workshop’s technical level is intended for a general scientific audience.  The speakers are selected from academia, industry and government, and who will be covering topics in terahertz generation, detection, and its applications.

Target Audience:

The workshop is targeted towards working engineers and scientists, local industry professionals, and graduate students unfamiliar with the Terahertz field, who want to learn more about the technologies and potential applications of this rapidly growing field.

Handouts:

Printed copies of the speakers Power Point slides will be provided to all registered attendees in advance of the talks.

Talk Schedule:

Day 1, Wed. October 12, 7:00 PM, Lecture 1:

Title: “Terahertz Transceivers and Potential Applications”, Dr. Eric Mueller, Coherent Inc

Abstract: A great deal of work has been performed in THz imaging utilizing short-pulse broad-band THz transceivers.  More recently groups have begun to do similar imaging work with CW THz sources.  While much of that work has utilized incoherent detectors, some  groups have started to use fully-coherent transceivers to realize more than 10 orders of magnitude improvement in available dynamic range.  This talk will provide an overview of THz transceiver technologies with an emphasis on fully-coherent CW transceivers, and include a review of material properties in the THz band.  Background motivation for CW imaging will be presented along with both amplitude and phase-contrast CW THz images.

Biography: Dr. Mueller has a PhD. in Physics from the University of Massachusetts. His PhD. work included: the first identification of D-centers (two electrons bound to one donor center) in semiconductor quantum wells (SQW), the first measurements of the central-cell correction for donors in SQWs, and the first use of a SQW as a THz heterodyne receiver.   After completing his PhD., Dr. Mueller accepted a position at the Submillimeter Technology Laboratory (STL) at UMass-Lowell and an Adjunct Professorship in the Physics Department. During his tenure at STL he made a number of individual contributions including: developing the world's first coherent THz laser radar, co-inventing the etalon diplexer, inventing a new type of single-sideband receiver, developing a THz sideband-generator-based laser radar, and developing  a model required to begin the detailed design of the 2.5 THz space laser.  Dr. Mueller left UMass in 1996 to be part of the startup of DeMaria Electro-Optic Systems (DEOS). While at DEOS, and subsequently Coherent, Dr. Mueller has helped  in building a substantial development group and scientific CO2/THz product portfolio for Coherent.  Dr. Mueller has provided oversight to the team's activities, managed a number of programs, and authored a number of key patents. Some of the programs are: LLO (the 2.5 THz space laser which is now in-orbit), the NIST laser leak detector ATP, the NASA/Goddard Space Flight Center tunable THz laser program (this program won the 2001 Tibbetts award for "Exemplifying Excellent in SBIR Research"), the NASA/Marshall Space Flight Center air-cooled THz laser program, the SALTI program (Synthetic Aperture LADAR for Tactical Imaging - this will be the world's first flight laser SAR), and Whisper (a special purpose commercial laser-based system).  Dr. Mueller serves on the program committees for a number of topical conferences including the Military Sensing Symposium on Active E-O Systems and the newly formed THz section of CLEO.  In 2004 Dr. Mueller was elected to the Connecticut Academy of Science and Engineering in recognition of "his pioneering work in CW THz sources and transceivers".  Dr. Mueller is a member of the Technology Advisory Council of Coherent, Inc.

Day 1, Wed. October 12, 8:15 PM, Lecture 2:

Title: “Chemical Recognition and Remote Sensing in the THz Spectral Region”, Dr. Mark G. Allen, Physical Science Inc.

Abstract: New sources in the THz spectral region  permit accessing the unique spectroscopic signatures of gases, liquids, and solid materials.  In many cases, these spectroscopic signatures may be probed while the material is enclosed in a package that is opaque to traditional light sources.  Thus, new opportunities for chemically-specific sensors in both in-situ and stand-off, or remote sensing, configurations are possible.  This tutorial will begin by exploring the intra- and inter-molecular origin of spectroscopic signatures in selected gases, liquids, and solids.  It will also describe the transmission spectra of many common packaging materials and highlight spectral regions where through-packaging inspection of chemical substances may be possible.  Much basic spectroscopic data in the THz region is acquired through laboratory studies using pulsed, broadband THz sources derived from mode-locked visible lasers.  The tutorial will explore the use of laser-based THz sources for quantitative spectroscopic measurements, including the time-domain formulation of the complex Beer's Law, methods for optimal numerical filtering of frequency inversions, and experimental methods for reliable and repeatable spectroscopic measurements of condensed phase materials in time-domain measurement systems.  Differential Absorption LIDAR techniques are being adapted for use as  standoff sensors in the THz spectral region.  The tutorial will discuss general approaches to this problem, especially with respect to THz emitter selection, atmospheric spectral windows for long-distance transmission, and signal processing algorithms.  The use of THz QCL's in these applications will be analyzed in detail.

Biography: Dr. Allen received his B.S. with honors in Mechanical Engineering in 1981 from the University of Kentucky.  He received M.S. (1982) and Ph.D. (1987) degrees) in Mechanical Engineering from Stanford University under the guidance of Prof. Ronald K. Hanson.  Since joining Physical Sciences Inc. in 1987, Dr. Allen has continued his research in the development of laser and optical devices, sensor systems, and measurement techniques.  He is currently Vice-President of Photonics at PSI, where he directs research and development of advanced sensor and optical components for defense, security, environmental, medical, and industrial applications.  Dr. Allen is leading the development of practical applications of room-temperature laser technologies based on quantum cascade laser technology for 4.5 - 100 microns, interband cascade technology for 2 - 5 microns, and engineered optical materials for Difference-Frequency-Generation in the 2 - 5 microns spectral region.  He is an author of over 170 papers and presentations in laser-based sensors and spectroscopy.  Dr. Allen is a Fellow of the Optical Society of America, former Chair of the OSA Optical Science Division, and founding co-chair of the OSA Topical Meeting on Optical Terahertz Science and Technology.

Day 2, Wed. October 19, 7:00 PM, Lecture 3:

Title: “Terahertz Radiation in Ferroelectric Crystals: Spectroscopy, Coherent Control, Polaritonics, and Applications”, Dr. David Ward, Harvard University

Abstract: When terahertz radiation propagates in an ionic crystal the electromagnetic field couples to the phonon modes of the crystal resulting in an admixture of photons and phonons known as phonon-polaritons.  The variation of the index of refraction from the ionic displacements associated with the phonon component of the mixture can be imaged using standard techniques of phase-to-amplitude imaging and facilitates direct observation of the electromagnetic wave as it propagates through the host crystal.  If a ferroelectric crystal is employed, then optical laser light can generate the terahertz radiation through impulsive stimulated Raman scattering or difference frequency mixing.  This is easily implemented with a standard Ti:Saph amplified laser system.  Patterning of the host crystal facilitates an all-optical, single crystal platform providing generation, guidance, signal processing, and detection of terahertz radiation and requires no free space propagation.  Further, optical pulse shaping enables coherent control over the terahertz waveforms generated.  These polaritonic devices fill the gap between electronics and photonics.  Generation, propagation, guidance, control, and detection of terahertz radiation in ferroelectric crystals, as well as applications, will be presented.

Biography: David W. Ward received his B.S. degree in physics in 1999 from the College of Charleston and his Ph.D. in physical chemistry in 2005 from the Massachusetts Institute of Technology.  Dr. Ward is a co-founder of the field of polaritonics, which is an intermediate frequency regime between electronics and photonics where signals are manifest as admixtures of photons and phonons.  He is presently a postdoctoral fellow at Harvard University.  His interests are in terahertz technology, negative refraction, nanophotonics, single molecule detection, and finite-difference time-domain and molecular dynamics simulations.  Dr. Ward received the Qauttrochi scholarship as an undergraduate and was a finalist for the Truman Fellowship.  He is a member of the American Physical Society, the Optical Society of America, and the Materials Research Society.

Day 2, Wed. October 19, 8:15 PM, Lecture 4:

Title: “TBD”, Prof. James Kolodzey, ECE Dept., University of Delaware

 

Day 3, Wed. October 26, 7:00 PM, Lecture 5:

Title: “Generating, Guiding, and Detecting Terahertz Radiation”, Dr. Jason Deibel, EE & CS Dept., Rice University

Abstract: The terahertz (THz) region of the electromagnetic spectrum (100 GHz to 10 THz) remained relatively unexplored until developments in  ultra fast laser technology provided techniques for the generation and detection of THz radiation. As most dielectric materials are transparent at these frequencies and metals are opaque, there has been considerable interest in developing THz technology as an imaging technique for biomedical, industry, and security applications. The high temporal resolution and broad fractional bandwidth associated with THz radiation has also generated interest within the spectroscopy community.  In order to develop applications based on terahertz technology, attention must be devoted to several basic yet integral aspects of working with radiation in this regime.  During this workshop session, methods for the generation and detection of terahertz radiation will be covered, including the use of photoconductive antennas, electro-optic materials, and semiconductors.   We will also briefly focus on my own research in terahertz emission spectroscopy which is not only an effective method of testing novel terahertz sources, but it is also is an effective tool for investigating the various mechanisms responsible for terahertz generation and for characterizing material properties.   The second half of the session will be spent discussing the guided propagation of terahertz waves.  The development of terahertz waveguides has been stymied by the difficulty in finding a structure and material that exhibits low loss and dispersion at terahertz frequencies. Recently, our group at Rice University showed that simple metal wires  could be effective terahertz waveguides that exhibit very low loss and dispersion. Using this method, the very first terahertz endoscope was developed and demonstrated. Along with these results, I will present Finite Element Method (FEM) simulation results of the propagation of terahertz waves along metal wires.

Biography: Jason A. Deibel received the B.A. degree in both physics (with honors) and mathematics with a history minor from Transylvania University, Lexington, KY in 1997, and the Ph.D. degree in applied physics from the University of Michigan, Ann Arbor, MI in 2004. His dissertation focused on the use of nonlinear optical polymers in ultrafast electro-optic sampling measurements.  He is currently a post-doctoral Research Associate in the Department of Electrical and Computer Engineering at Rice University, Houston, TX, working with Professor Daniel Mittleman on various aspects of terahertz imaging and spectroscopy. His research interests include terahertz emission spectroscopy of novel inorganic and organic semiconductors, photoconductive antenna design, and finite element method simulations of terahertz guided wave propagation.  Dr. Deibel is a member of the Optical Society of America and the IEEE Lasers and Electro-Optics Society and is currently a Director of Central Intelligence Postdoctoral Fellow.

Day 3, Wed. October 26, 8:15 PM, Lecture 6:

Title: “DOD Terahertz Applications”, Dr. Sumanth Kaushik, MIT Lincoln Lab, Lexington, MA

Day 4, Wed. November 2, 7:00 PM, Lecture 7:

Title: “Low-Noise Terahertz Receivers for Space Science and Terrestrial Imaging Applications”, Prof. K. Sigfrid Yngvesson, EE & CS Dept, UMASS, Amherst

Abstract: This talk will review recent progress related to low-noise Terahertz (THz) receivers. The last decade has seen the development of Hot Electron Bolometer (HEB) receivers with superconducting (especially NbN) elements that have decreased the noise temperatures obtained above 1 THz by about an order-of-magnitude compared with earlier technology (Schottky-barrier diode mixers).  The University of Massachusetts has led the installation of a 1.2 THz to 1.5 THz HEB receiver based on the AST/RO 1.7 meter diameter telescope at the South Pole. Developments in Europe have led to THz HEB receivers that will be launched on the Herschel spacecraft in 2007. We will briefly discuss the design of such receivers, the current state-of-the-art, and the ultimate limits to their noise temperature due to quantum noise.  The above astronomical application developments have also resulted in the availability of a new low noise detector technology that can be applied in terrestrial systems. For example, UMass has demonstrated a THz focal plane array  as a prototype for future arrays needed for imaging systems that can produce THz images at video rates. Early results obtained with such a system will be discussed, and other possible applications for the new technology will be identified.

Biography: Professor  Sigfrid  Yngvesson  received  his  graduate  degrees  in Physical  Electronics  (Tekn.lic.,  1965,  and  Tekn.Dr.,  1968,  resp.)  from  the  Department  of  Electrical Engineering at Chalmers University of Technology, Gothenburg, Sweden. He has done research  in  the  Physics  Department  at  the  University  of  California,  Berkeley  (1964-1966, and  1968-1970)  and  has  been  teaching  at  the University of Massachusetts, Amherst, since 1970, where he became a full professor in 1978. Professor Yngvesson was elected a fellow of the Institute of Electrical and Electronics Engineers (IEEE) in 1998. His field is microwave, millimeter wave and  submillimeter  wave  (terahertz) devices  and  applications,  especially  low  noise  receivers  with applications to astronomy and space science.  In the last fifteen years  his research has primarily dealt with the development and application of hot electron bolometer heterodyne receivers for the terahertz frequency range.  He also works on microwave applications to Chemical engineering problems in catalysis. He is the author of “Microwave Semiconductor Devices”, a text and reference book (Kluwer Academic Publishers, 1991)  as well as over 50  papers in refereed journals.

Day 4, Wed. November 2, 7:50 PM, Lecture 8:

Title: “Measurement Aspects of Terahertz Technologies”, Dr. Eyal Gerecht, NIST

Abstract: Imaging and spectroscopy at terahertz frequencies (defined roughly as 300 GHz – 3 THz) have great potential for both healthcare and homeland security applications. Terahertz frequencies correspond to the rotational energy level transitions of important molecules in biology and astrophysics. Terahertz radiation (T-rays) can penetrate clothing and, to some extent, can also penetrate biological materials, and because of their shorter wavelengths they offer higher spatial resolution than microwaves or millimeter waves.  However, development of terahertz technologies is impeded or even prevented by the lack of standards and the inability to perform precise measurements to characterize noise, power, dielectric constants, and scattering parameters of systems and components operating at terahertz frequencies. Without noise characterization capability, for example, it is impossible to separate signal from background. This problem is particularly challenging in the terahertz range, which lies between the microwave/millimeter-wave range and the infrared range, both of which have well developed methods and technology for measuring noise and sensitivity. However, neither set of tools for noise measurements can be extended directly to terahertz frequencies.  In addition, the dominant source for noise in electronic systems at terahertz frequencies, other than thermal noise, which is dominant at microwave and millimeter-wave frequencies, is quantum noise due to vacuum fluctuations, which dominates at optical frequencies.  In the terahertz range, both quantum and thermal noise are important and must be dealt with. Similar arguments can be applied to power and material measurements at terahertz frequencies.  I will discuss in detail measurement techniques currently available at terahertz frequencies. In addition, I will describe the work in progress at NIST aimed to provide better tools for the development of terahertz technologies in the future.

Biography: Dr. Eyal Gerecht received his Ph.D. degrees in Electrical and Computer Engineering from the University of Massachusetts at Amherst in 1998. In 1998, he joined the Department of Physics and Astronomy at the University of Massachusetts at Amherst as a Senior Postdoctoral Research Associate. Since 2000, he has been a physicist in the Electromagnetics Division at the National Institute of Standards and Technology, Boulder, CO. developing a number of terahertz technologies for imaging and spectroscopy for homeland security and biomedical applications.  Dr. Eyal Gerecht is one of the US leaders in the development of the near quantum-noise limited phonon-cooled HEB mixer receivers, funded primarily by NASA and NSF. Dr. Gerecht is a Co-PI of the successful development and installation (in 2002-2003) at the US South Pole Station of the 1.25 THz to 1.5 THz spectroscopical receiver system (TREND).

Day 4, Wed. November 2, 8:40 PM, Lecture 9:

Title: “High Power THz Generation”, Dr. Gwyn Williams, Jefferson Lab

Abstract:           Light is one of our prime tools for understanding both the form and function of materials ranging from superconductors to proteins, yet there is a gap in the electromagnetic spectrum between electronics and photonics at frequencies around 1 THz.  Recently at Jefferson Lab, (Nature 420 153-156 (2002)), we demonstrated the production of THz light that was 10,000 times brighter than any previous source. We have subsequently taken this work to higher powers and constructed a user facility for its exploitation.  We will discuss the physics of the new generation of accelerator-based light sources which we used for these experiments, and further describe future possibilities for yet higher power.

Biography: Gwyn Williams is a Senior Physicist and Basic Research Program Manager at the Free Electron Laser facility (FEL) at Jefferson Lab in Newport News, Virginia, and a Fellow of the American Physical Society.  He is also head of the JLab high power THz facility.  Since obtaining his PhD from Sheffield University in the UK in 1971, Gwyn has co-authored 220 research publications, most of them in the surface science area, and several book chapters.  The bulk of his career has been at Brookhaven National Laboratory but 5 years ago he moved to Jefferson Lab in Virginia.  Gwyn’s research has involved understanding the fundamental physical behavior of materials and surfaces via photoemission studies of the electronic structure, and infrared studies of the vibrational dynamics of adsorbates.  His research has motivated a lifelong parallel development of ultra-bright light sources as probes, a path that recently took him into the THz regime using the ultrafast facilities that are part of the FEL facility.  He was the 1990 recipient of an R&D 100 Award for developing a wavefront dividing interferometer for use with ultrabright sources.  His current research programs involve studies of the frequency dependent conductivity of gold nanowires on vicinal silicon surfaces and of the dynamics of bonding vibrational modes in both time and frequency domains.  Gwyn currently serves on a number of scientific advisory committees for large facilities around the world, has served as editor for several journals, and currently is on the editorial board of the Review of Scientific Intrsuments, and Synchrotron Radiation News.

Day 5, Wed. November 9, 7:00 PM, Lecture 10:

Title: “Terahertz Technology in Outer and Inner Space”, Dr. Peter Siegel, Caltech (Beckman Institute)

Abstract: After more than 30 years of niche applications in the space sciences area, the field of Terahertz Technology is entering a true Renaissance.  While major strides continue to be made in submillimeter wave astronomy and spectroscopy, the past few years have seen an unprecedented expansion of terahertz applications, components and instruments.  Broad popular interest in this unique frequency domain has emerged for the first time, spanning applications as diverse as biohazard detection and tumor recognition.  Already there are groups around the world who have applied specialized Terahertz techniques to disease diagnostics, recognition of protein structural states, monitoring of receptor binding, performing label-free DNA sequencing and visualizing contrast in otherwise uniform tissue.  A commercial terahertz imaging system has recently started tests in a hospital environment and new high sensitivity imagers with much deeper penetration into tissue have begun to emerge.  Solicitations for more sophisticated instruments and enabling terahertz components have filtered into US agency proposal calls from DoD and NASA, to NSF and NIH, and many new research groups have sprung up, both in this country and in Europe and Asia.  This talk will broadly survey terahertz technology from its cradle applications in space science and spectroscopy to more recent biomedical and chemical uses.

Biography: Peter H. Siegel obtained a BS in astronomy and physics from Colgate University, Hamilton NY in 1976, a Masters in Physics and a PhD in Electrical Engineering from Columbia University in 1978 and 1983 respectively. He has been involved in the analysis and development of millimeter-and submillimeter-wave sensors for nearly 30 years. He began his career in millimeter wave technology in 1975 as a summer student at the NASA Goddard Institute for Space Studies in New York City, working with astronomer Patrick Thaddeus and electrical engineer Tony Kerr on low noise receivers. In 1983 he moved up in frequency to the submillimeter, working as a National Research Council Fellow on THz planar antenna arrays. From 1984-87 Dr. Siegel was employed at the National Radio Astronomy Observatory where he worked with Sandy Weinreb and the millimeter wave receiver group in Charlottesville Virginia, maintaining the Kitt Peak National Radio Observatory. He moved to JPL in 1987 to work on advanced technology development for NASA astrophysics applications.

Day 5, Wed. November 9, 8:15 PM, Lecture 11:

Title: “Terahertz Quantum Cascade Lasers”, Prof. Qing Hu, EE & CS, MIT

Abstract: Terahertz frequencies are among the most underdeveloped of the electromagnetic spectra, even though their potential usefulness can have a major impact on many areas of life today.  This underdevelopment is primarily due to the lack of coherent solid-state THz sources.  Unipolar lasers based on intersubband transitions of semiconductor quantum wells were proposed for long-wavelength sources and amplifiers as early as in the 1970s.  Electrically pumped intersubband-transition lasers (known as quantum-cascade lasers (QCLs)) at ~4-µm wavelength were first developed at Bell Laboratories in 1994.  However, the development of their THz counterparts turned out to be much more difficult, because of two unique challenges at THz frequencies.  First, the energy level separations that correspond to THz frequencies are quite narrow (~10 meV).  Thus, the selective depopulation mechanism based on energy-sensitive LO-phonon scattering, which has been widely used in mid-infrared QCLs, is not applicable.  Second, low-loss optical mode confinement is difficult to implement at THz frequencies.  In October 2001, almost eight years after the initial development of QCLs, the first QCL operating below 4.4 THz, was developed.   This laser was based on a chirped superlattice structure that had been successfully developed at mid-infrared frequencies.  Mode confinement in this THz QCL was achieved using a double-surface plasmon waveguide grown on a semi-insulating (SI) GaAs substrate.  Shortly afterward, THz QCLs based on a bound-to-continuum intersubband transition were also developed, which have yielded higher operating temperatures and greater output power levels than those based on chirped-superlattice structures.  Our group at MIT has pursued a different approach to achieve lasing at THz frequencies.  We have investigated possibilities of using fast LO-phonon scattering to depopulate the lower radiative level, and using double-sided metal-metal waveguides for THz mode confinement.  In November 2002, a 3.4-THz QCL was developed in which the depopulation of the lower radiative level was achieved through resonant LO-phonon scattering.  Following our initial success in developing the 3.4-THz laser, we demonstrated the first terahertz QCL that uses a double-sided metal-metal waveguide for mode confinement.  Based on this metal-metal waveguide structure and using improved gain media that reduced the lasing threshold current densities, we have achieved several records in the performance of THz QCLs.  Meanwhile, our collaborators in Europe have successfully pumped a superconducting heterodyne receiver using one of the our THz QCLs as the local oscillator, and they have achieved a record-low receiver noise temperature of 1400 K at 2.8 THz.  For sensing and local-oscillator applications, our collaborators at University of Colorado have demonstrated frequency/phase locking of our THz QCLs with a FWHM linewidth of 65 kHz, obtained over an indefinitely long period of time.  This rapid development is encouraging and we are optimistic that THz QCLs will find immediate applications in imaging experiments.

Biography: Prof. Qing Hu received his Ph.D. in physics from Harvard University in 1987. After a three-year postdoctoral research experience at U. C. Berkeley, he joined the faculty of Electrical Engineering and Computer Science at MIT in 1990, and has been there ever since.

Directions:

The workshop is located at MIT Lincoln Laboratory, 244 Wood Street, Lexington, MA 0242. Driving directions to Lincoln Laboratory from interstate I-95/Route128: From Exit 31B, Take Exit 31B onto Routes 4/225 towards Bedford - Stay in right lane. Use Right Turning Lane (0.3 mile from exit) to access Hartwell Ave. at 1st Traffic Light. Follow Hartwell Ave. to Wood St. (~1.3 miles). Turn Left on to Wood Street and Drive for 0.3 of a mile. Turn Right into MIT Lincoln Lab, at the Wood Street Gate. From Exit 30B  Take Exit 30B on to Route 2A - Stay in right lane. Turn Right on to Mass. Ave (~ 0.4 miles - opposite Minuteman Tech.).  Follow Mass. Ave for ~ 0.4 miles. Turn Left on to Wood Street and Drive for 1.0 mile. Turn Left into MIT Lincoln Lab, at the Wood Street Gate.

For more information on the technical content of the Terahertz Systems Workshop: please contact Matthew Emsley, Chair, Central New England LEOS Chapter at memsley@ieee.org, or Farhad Hakimi, Chair, Terahertz Systems Workshop, fhakimi@draper.com, or William H. Nelson, Co-Chair, Terahertz Systems Workshop, at w.nelson@ieee.org, or visit the IEEE website at http://www.ieeeboston.org.

Course Fee Schedule:

On-line Registration and Payment

On-line registration is closed for this course.  You may register on-site.  If you have any questions, please call the office at 781-245-5405.

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Updated Thursday June 28, 2007