A simple Raman probe was realized using a single flexible hollow waveguide (HW). A HW coated with a silver film, which had reasonable transmission and little optical background noise, was used as a bidirectional transmission fiber for both the excitation and collection of Raman scattered light. The HW itself generated no Raman scattering or fluorescence noise during transmission. A complex filtering system at the end of the waveguide was thus unnecessary. In addition, the measured Raman spectra showed better signal-to-noise ratios than a conventional Raman fiber probe. The HW’s suitability as a Raman fiber probe was also demonstrated.
© 2005 Optical Society of America
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(120.4820) Instrumentation, measurement, and metrology : Optical systems
(140.3510) Lasers and laser optics : Lasers, fiber
(300.6450) Spectroscopy : Spectroscopy, Raman
Optical Coherence Tomography
Yuichi Komachi, Hidetoshi Sato, Yuji Matsuura, Mitsuno Miyagi, and Hideo Tashiro, "Raman probe using a single hollow waveguide," Opt. Lett. 30, 2942-2944 (2005)