• Title/Summary/Keyword: optical pulse amplification

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Four-pass dye laser amplifier for the direct pulsed amplification of a tunable narrow-bandwidth continuous-wave laser (좁은 선폭을 갖는 파장가변 연속파 레이저의 펄스형 증폭을 위한 사중경로 색소 레이저 증폭기)

  • 이재용;이해웅;유용심;한재원
    • Korean Journal of Optics and Photonics
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    • v.10 no.2
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    • pp.162-168
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    • 1999

  • A new design of four-pass dye laser amplifier affording a narrow-bandwidth pulsed output is demonstrated to suppress the amplified spontaneous emission(ASE) carried by the amplifier output and reduce the possibility of parasitic oscillation in the amplifier. By the direct pulsed amplification of a cw 100 mW dye laser under a Q-switched doubled Nd:YAG laser pumping with energy of 5.6 mJ/pulse, high-peak-power pulsed output with 1.5-mJ energy in 130-MHz bandwidth is obtained corresponding to a power gain greater than $2{\times}10^6$ and an energy efficiency of 27%. The ASE ratio in the four-pass amplifier output is dramatically reduced by using a diffraction grating in the amplifier. Compared with the results obtained from the normal operation of the amplifier with no frequency-selective device, the ASE ratio is reduced by a factor in excess of 10 to remain under 1.5% of the amplifier output whereas the total output energy is slightly increased by ~4%.

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A Study on the Optimization and the Transient Phenomena of the $Pr^{3+}$ doped Fiber Amplifier ($Pr^{3+}$이 도핑된 광섬유증폭기의 최적화 및 과도현상에 관한 연구)

  • 이재명;지명훈;염진용;이영우
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2001.05a
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    • pp.333-336
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    • 2001

  • The transient response in PDFA(Praseodymium-Doped Fiber Amplifier) is theoretically investigated. The PDFA has the spectral gain band in 1.3${\mu}{\textrm}{m}$. The transient model includes the transient buildup of the population inversion, the pump power, and the signal power and their transient variation along the fiber amplifier. The numerical analysis of transient model can predict the gain saturation, the variation of pump power and the gain as a function of the fiber length. It also shows the gain saturation and recovery effects depending on the pumping rate lead to distortion and saturation in the amplification of optical pulse. The results of numerical analysis, for the case of the Pr ion concentration of 1000ppm and the pump power of 0.5W the gain saturation is obtained 30dB at the length of 5m and the saturation time of upper level is 250 $mutextrm{s}$.

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