• Title/Summary/Keyword: stimulated brillouin scattering

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Stimulated Raman scattering at 1.54${\mu}m$ and Brillouin scattering at 1.06${\mu}m$ in $CH_4$ under 5 Hz repetition rate (반복률과 라만매질 압력에 따른 1.54 ${\mu}m$ 전방, 후방 유도라만 및 1.06${\mu}m$ Brillouin 산란광의 출력특성)

  • 최영수;전용근;김재기
    • Korean Journal of Optics and Photonics
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    • v.10 no.2
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    • pp.95-101
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    • 1999

  • We have studied the 1.54$\mu\textrm{m}$ forward and backward stimulated Raman scattering (SRS) and stimulated Brillouin scattering (SRS) for various $CH_4$pressures by 1.06$\mu\textrm{m}$ Q-switched Nd:YAG laser pumping under a repetition rate of Hz in single pass. We obtained that the output of backward SRS was more efficient than that of the forward SRS. The output energy and conversion efficiency of forward and backward SRS were higher than those of SBS since SRS is a steady state, but SBS is a transient state. In a $CH_4$gas uncirculating system, the output energy of the backward SRS and SBS were reduced the about 47% due to a thermal heating of $CH_4$medium in a focusing region for a repetition rate of 5 Hz. But, the output energy of forward SRS was slightly enhanced by about 8.5% due to the increase of the undepleted pump beam in the backward SRS generation. Inthe Raman half resonator using a dichromatic focusing lens, the conversion efficiency of SRS was more than 37% for a input pump laser energy of 40 mJ.

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Experiment of Distributed Optical Fiber Sensor Using Spatially-Selective Brillouin Scattering (공간 선택적 브릴루앙 산란을 이용한 분포형 광섬유 센서의 실험)

  • Seo, Min-Sung;Yun, Seung-Chul;Hyun, Jin-Young;Park, Hee-Gap
    • Korean Journal of Optics and Photonics
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    • v.17 no.3
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    • pp.223-230
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    • 2006

  • We demonstrate a distributed fiber sensor system based on spatially-selective Brillouin scattering, using a single laser diode as a light source whose optical frequency is directly modulated by the injection current. The pump and the counter-propagating probe lights, which are sinusoidally frequency-modulated, are superposed in the fiber so that stimulated Brillouin scattering takes places only at a specific location along the fiber. Brillouin gain peak position is controlled by varying the modulation frequency. Distributions of Brillouin shift frequency are measured for the case of concatenated optical fibers of two different kinds and also for the case of temperature distribution. The temperature coefficient of the Brillouin shift frequency is measured to be $1.33MHz/^{\circ}C$.

  • https://doi.org/10.3807/KJOP.2006.17.3.223 인용 PDF KSCI

Multiple Brillouin Stokes Generation Utilizing a Linear Cavity Erbium-Doped Fiber Laser

  • AL-Mansoori, Mohammed Haydar;Noordin, Nor Kamariah;Saripan, M. Iqbal;Mahdi, Mohd Adzir
    • Journal of Communications and Networks
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    • v.10 no.1
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    • pp.1-4
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    • 2008

  • This paper reports the design of a multiwavelength fiber laser source that utilizes a linear cavity of hybrid Brillouin/Erbium fiber laser (BEFL). The output power, threshold power and free running cavity modes were investigated against the pump powers. The structure exhibited low threshold operation of 4 mW at 2.3 mW injected Brillouin pump power. The optimization of Brillouin pump wavelength, power and Erbium gain led to a maximum possible number of channels generated. Simultaneous and stable operation of 21 channels with 10.88 GHz channels spacing were obtained from this architecture at 1 mW injected Brillouin pump power and 90 m W Erbium doped fiber pump power in the 1555 nm region.

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