Journal
MEASUREMENT SCIENCE AND TECHNOLOGY
Volume 25, Issue 9, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0957-0233/25/9/095201
Keywords
PZT; creep; control; cavity; CRDS; spectroscopy
Funding
- NCRR NIH HHS [P41 RR013461] Funding Source: Medline
- NIGMS NIH HHS [R21 GM111242, P41 GM103483] Funding Source: Medline
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Cavity ring-down spectrometers typically employ a PZT stack to modulate the cavity transmission spectrum. While PZTs ease instrument complexity and aid measurement sensitivity, PZT hysteresis hinders the implementation of cavity-length-stabilized, data-acquisition routines. Once the cavity length is stabilized, the cavity's free spectral range imparts extreme linearity and precision to the measured spectrum's wavelength axis. Methods such as frequency-stabilized cavity ring-down spectroscopy have successfully mitigated PZT hysteresis, but their complexity limits commercial applications. Described herein is a single-laser, model-based, closed-loop method for cavity length control.
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