Journal
REVIEW OF SCIENTIFIC INSTRUMENTS
Volume 76, Issue 6, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1931205
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We describe the design and operation of a spatially-filtered Raman/fluorescence spectrometer that incorporates a pulsed 532 nm laser excitation source and a synchronized and electronically gated CCD detector. This system permits the suppression of undesired continuous radiation from various sources by a factor of up to 50 000 providing the possibility of acquiring Raman signals at temperatures exceeding 5 000 K. We present performance comparisons of this system with that of a state-of-the-art conventional CW system using a 458 nm excitation source. We also demonstrate that the pulsed system is capable of suppressing an impurity-induced (single nitrogen defects) fluorescence in diamond, and further suggest that this capability can be used to suppress the stress-induced fluorescence in diamond that may appear at pressures near or above 150 GPa. This work suggests that Raman spectroscopy under conditions of very high temperatures (to 5000 K) and/or ultrahigh pressures (to 300 GPa) is entirely viable. (c) 2005 American Institute of Physics.
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