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Facilities and Equipment
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HIGP's Vibrational Spectroscopy Laboratory specializes in both Continuous Wave (CW) and pulsed Laser-Raman and luminescence spectroscopy. Currently our facility has a state-of-art time-resolved micro-Raman mutichannel spectrograph, consisting of a SPEX triplemate spectrometer, two liquid-nitrogen cooled CCD Raman detectors (from Photometrics and Princeton Instruments) and two intensified gated diode array detectors (from Princeton Instruments and EG&G PARC, respectively). The diode array detectors are mounted on two portable Spex spectrometers (model 1681 and 270-M), respectively. Two Brimrose Acousto-Optic Tunable filters (visible and near IR, respectively) are available for conducting tests of spectral imaging. We have a fully automated Spex double monochromator (Spex Model 1403 with a Datamate computer), Spectra-Physics CW Ar+ and Kr+ ion lasers as well as a Quanta-Ray pulsed Nd:YAG UV-visible system with 10 nano-sec wide pulses as well as a Spectra-Physics model RS-4 Raman shifter. Dual Boxcar integrators for time resoled fluorescence and Raman spectroscopy. Laboratory also has a BOMEM FT Raman / IR system equipped with a CW ND:YAG laser and IR microscope. One atomic Force microscope (AFM) and a laser scanning confocal microscope LSCM) are also available.
Scientists in the Raman Laboratory have also developed a transportable Mie-Rayleigh Raman lidar facility. The system has a range of about 12 km and a spatial resolution of about 3 meters. It incorporates a sophisticated multi-wavelength solid-state laser and a computer-controlled scanner, which enables flexible pointing of the laser. Using the scanner, we are able to construct three-dimensional maps of important constituents of the atmosphere, such as water vapor.
HIGP facilities also include a cryogenic environment chamber for spectral measurement of materials at low temperatures.
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Stand-off Pulsed Raman Spectroscopic Laboratory Prototype: This particular piece of instrumentation is one of the University of Hawai'i's two stand-off pulsed Raman spectroscopic systems. It is based on a 5-inch Maksutov-Cassegrain telescope and a small (4-inch diameter) Newtonian telescope receiver. When functioning in unison these systems are capable of measuring the Raman spectra of minerals located at a distance of 4.5 to 66 meters from the telescope. This is done via excitation of the source of interest (rocks, sediments, minerals, and/or organics) by two continuous wave (CW) Argon-ion and frequency doubled Nd:YAG (532 nm) pulsed (20 Hz) lasers.
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Field-Protable Stand-off Pulsed Raman Spectroscopic System: This system is very similar to the stand-off laboratory prototype above. The only difference is a smaller (volumetrically 5X smaller) and more efficient spectrograph (f/2.2) has been used. The advantage of this setup is a greatly improved light throughput (a factor of 4 greater). |
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Continuous Wave Telescopic Raman Spectroscopic System: Instead of a pulsed laser, this instrument uses a continuous wave laser. Raman spectra recorded from this system are relatively easy to compare to the pulsed system spectra from the two instruments above. |
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Combined Stand-off LIBS and Pulsed Raman Spectroscopic System: This system is capable of determining mineralogical information as well as major element composition. |
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RAMAN HOME | PUBLICATIONS | USES | CURRENT WORK | FACILITIES & EQUIPMENT |
For more information on the Raman Spectroscopy Laboratory at HIGP contact Dr. Shiv Sharma.
Webpage maintained by Josh Cahill.
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