Probe And Enhancement Of SBS Based Phonons In Infrared Fibers Using Waveguide Coupled External Radiation

C. Yu; Yat C. Chong; C. K. Fong

doi:10.1117/12.951397

2 June 1989 Probe And Enhancement Of SBS Based Phonons In Infrared Fibers Using Waveguide Coupled External Radiation

C. Yu, Yat C. Chong, C. K. Fong

Proceedings Volume 1048, Infrared Fiber Optics; (1989) https://doi.org/10.1117/12.951397
Event: OE/LASE '89, 1989, Los Angeles, CA, United States

Abstract

Interaction of GHz and MHz radiation with CO2 laser propagation in a silver halide fiber using sBs based phonon coupling is furthet investigated. The external signal serves to both probe and enhance laser generated sBs phonons in the fiber. Efficient coupling of microwave radiation into the fiber is accomplished by placing the fiber in a hollow metallic waveguide, designed and constructed to transmit the dominant mode in the 0.9-2.0 GHz band. MHz radiation is conveniently coupled into the fiber using the guided microwave radiation as carrier. Phonon emissions from the fiber under CO2 laser pumping are first established on a spectrum analyzer; low frequency generators ale then tuned to match these frequencies and their maximum interaction recorded. Such interactions are systematically studied by monitoring the amplitude and waveform of the reflected and transmitted laser pulse at various power levels and frequencies of the externally coupled radiation. A plot of reflected laser power versus incident laser power reveals a distinct sBs generated phonon threshold. Variouslaunch directions of the GHz and MHz radiation with respect to the direction of laser propagation are realized to verify theory governing sBs interactions. The MHz radiation and its associated phonons in the fiber are convenient tools for probing sBs related phenomenon in infrared fibers.

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C. Yu, Yat C. Chong, and C. K. Fong "Probe And Enhancement Of SBS Based Phonons In Infrared Fibers Using Waveguide Coupled External Radiation", Proc. SPIE 1048, Infrared Fiber Optics, (2 June 1989); https://doi.org/10.1117/12.951397

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KEYWORDS

Optical fibers

Phonons

Microwave radiation

Fiber lasers

Pulsed laser operation

Infrared radiation

Waveguides

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