1 May 2014 Semiconductor saturable absorber mirror passively Q-switched 2.97 μm fluoride fiber laser
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Abstract
A diode-cladding-pumped mid-infrared passively Q-switched Ho3+-doped fluoride fiber laser using a reverse designed broad band semiconductor saturable mirror (SESAM) was demonstrated. Nonlinear reflectivity of the SESAM was measured using an in-house Yb3+-doped mode-locked fiber laser at 1062 nm. Stable pulse train was produced at a slope efficient of 12.1% with respect to the launched pump power. Maximum pulse energy of 6.65 μJ with a pulse width of 1.68 μs and signal to noise ratio (SNR) of ~50 dB was achieved at a repetition rate of 47.6 kHz and center wavelength of 2.971 μm. To the best of our knowledge, this is the first 3 μm region SESAM based Q-switched fiber laser with the highest average power and pulse energy, as well as the longest wavelength from mid-infrared passively Q-switched fluoride fiber lasers.
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Jianfeng Li, Hongyu Luo, Yulian He, Yong Liu, Binbin Luo, Zhongyuan Sun, Lin Zhang, Sergei K. Turitsyn, "Semiconductor saturable absorber mirror passively Q-switched 2.97 μm fluoride fiber laser", Proc. SPIE 9135, Laser Sources and Applications II, 913504 (1 May 2014); doi: 10.1117/12.2053893; https://doi.org/10.1117/12.2053893
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