Abstract

We report on the development of a simple, rugged fiber-optic probe for process Raman measurements, in which laser line rejection is based on an absorptive longpass filter made from a direct bandgap CdTe semiconductor. The probe can be used with a fixed wavelength laser at 830 nm, and Raman spectra can be recorded down to 200 cm^-1 from the laser line. The filter thickness can be adjusted for final turning of the filter edge, as the edge slope is almost independent of thickness in the range 0.1 to 1 mm. Other properties of the probe, such as its signal-to-noise ratio and signal-to-background ratio, are shown to compare well with those of a state-of-the-art probe based on holographic notch filter techniques.

Miniaturized 7-in-1 fiber-optic Raman probe

Bohong Zhang, Rex E. Gerald, and Jie Huang
Opt. Lett. 47(21) 5561-5564 (2022)

Fiber Raman background study and its application in setting up optical fiber Raman probes

Jiaying May and Ying-Sing Li
Appl. Opt. 35(15) 2527-2533 (1996)

Optical Fiber Probe for Biomedical Raman Spectroscopy

Jason T. Motz, Martin Hunter, Luis H. Galindo, Joseph A. Gardecki, John R. Kramer, Ramachandra R. Dasari, and Michael S. Feld
Appl. Opt. 43(3) 542-554 (2004)

Micro-optical fiber probe for use in an intravascular Raman endoscope

Yuichi Komachi, Hidetoshi Sato, Katsuo Aizawa, and Hideo Tashiro
Appl. Opt. 44(22) 4722-4732 (2005)

Long fiber-optic remote Raman probe for detection and identification of weak scatterers

Christian L. Schoen, Thomas F. Cooney, Shiv K. Sharma, and David M. Carey
Appl. Opt. 31(36) 7707-7715 (1992)