Abstract

Sensitivity often restricts remote Raman spectrometers to operate at ranges inside their very large hyperfocal distances. Operation against a daylit background then requires minimizing the system etendue. This can be done by focusing the system at the range of interest; the depth of field is then etendue limited and varies with the square of the range. For the usual case of depth of field limited sampling depth, this cancels the inverse square range effect on signal strength, making the signal range independent (if atmospheric absorption is neglected). This concept is proven analytically and experimentally.

© 1974 Optical Society of America

Collector Size or Range Independence of SNR in Fixed-Focus Remote Raman Spectrometry

T. Hirschfeld
Appl. Opt. 13(7) 1615-1617 (1974)

Pulsed Dye Laser System for Raman and Luminescence Spectroscopy

M. I. Bell and R. N. Tyte
Appl. Opt. 13(7) 1610-1614 (1974)

Operation and Performance of a Lunar Laser Ranging Station

E. C. Silverberg
Appl. Opt. 13(3) 565-574 (1974)

Remote Atmospheric Sensing with an Airborne Laser Absorption Spectrometer

R. T. Menzies and M. T. Chahine
Appl. Opt. 13(12) 2840-2849 (1974)

Focused, Multiple-Pass Cell for Raman Scattering

R. A. Hill and D. L. Hartley
Appl. Opt. 13(1) 186-192 (1974)