Experimental studies of high order soliton compression effect and gain characteristics in femtosecond laser pulses Er3+-doped fiber amplifier |
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Authors: | Dongfeng Liu Guofu Chen Jintao Bal and Xianhua Wang |
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Institution: | (1) State Key Laboratory of Transient Optics Technology, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, 710068 Xi’an, China |
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Abstract: | Seed laser pulses with average power of 146 μW and pulse duration of 480 fs were amplified to 14.5 mW. The pulse duration
was compressed to 260 fs using 6 m high concentration E3+
r -doped fiber under forward pumping. The amplified signal pulse energy was 0.691 nJ (corresponding to a peak power of 2 657.7
W) and the repetition rate was 20.84 MHz. Spectrum breakup was observed simultaneously. The spectrum of pulses amplified by
3 m E3+
r -doped fiber remains a single peak under different pump power. The amplified pulse duration was compressed abnormally with
the increasing pump power using the backward pumping; that is, the amplified pulses were compressed with the increasing pump
power under low pump power. When the pump power reached 38 mW, the shortest amplified pulse duration was 309 fs. With further
increase in pump power, the amplified pulses began broadening, accompanied by a single peak spectrum under different pump
power. |
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Keywords: | ultrafast optics transient optics femtosecond optics optical fiber amplifier femtosecond laser amplification laser technology soliton optical flber communication |
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