We report on the feasibility of MIL-101(Cr) (MIL: Materials of Institute Lavoisier) and MIL-101(Cr)-NH2 as novel saturable absorbers for the development of passively Q-switched nanosecond mid-infrared fiber laser systems. The MIL101(Cr) and MIL-101(Cr)-NH2 are prepared using hydrothermal synthesis method and their modulation depths are measured to be 24.09% and 22.83%, respectively. We employ them separately as SAs to achieve passively Q-switched fiber lasers operating at 2.8 μm, for the first time, to the best of our knowledge. Stable Q-switched pulse operation is realized with the shortest pulse duration of 0.75 μs at a repetition rate of 162.58 kHz when using MIL-101(Cr) as a SA. It generates the maximum average output power of 524.4 mW, pulse energy of 2.72 μJ and peak power of 3.43 W at the launched pump power of 3.64 W. In addition, we replace the MIL-101(Cr) with MIL-101(Cr)-NH2 and nanosecond pulses with a pulse duration of 0.79 μs and average output power of 479.5 mW are obtained. The corresponding pulse energy and peak power are 2.27 μJ and 2.87 W, respectively. Our results show that the MIL-101(Cr) and MIL-101(Cr)- NH2 are promising stable SAs for nanosecond laser pulses generation at 3 μm.
Based on Michelson interferometer principle and controlled via an elaborately designed computer program, the variation
of interference order, which contains the information of refractive index and its variation, can be detected by an optical
power meter and a CCD camera. According to the relation between the increment of interference order and the change in
optical path difference, the refractive index of photopolymer samples can be calculated in an accurate way. Typical
measurements of the refractive index of our photopolymer samples are 1.547 and 1.583 at wavelength 532nm and 457
nm, respectively.
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