Yb3+-doped fiber amplifier for low repeat frequency pulse
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1.
Southwest Insistute of Technical Physics, Chengdu 610041, China;
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2.
School of Electronics and Information Engineering, Sichuan University, Chengdu 610041, China
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Received Date:
2008-11-08
Accepted Date:
2008-12-22
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Abstract
In order to study a two-stage Yb3+-doped fiber amplifier for low repetition frequency pulses,a pulse driven laser diode was used as the seed source to obtain rectangle optical pulses with repetition rate of 100Hz,full width at half maximum(FWHM)of 100ns and energy of 30nJ.In the first stage,8.2 μJ pulse energy was obtained by a single mode Yb3+-doped fiber amplifier,in which amplified spontaneous emission was restrained efficiently by means of the method of round-trip amplification. Pumped by 980nm high power multimode laser diodes,the second stage was a double clad Yb3+-doped fiber amplifier with 15 μm fiber core diameter.242μJ output pulse energy was obtained at 7.3W pump power.The FWHM was compressed to 29ns.A near diffraction limited beam was produced from the amplifier with quasi-single mode output.The results shows that the high pulse energy fiber laser has advantage of simple all fiber structure.
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