Laser diode end-pumped passively Q-switched Tm,Ho:YLF laser with Cr:ZnS as a saturable absorber |
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| Authors: | Xinlu Zhang Xiujuan Bao Li Li Hong Li Jinhui Cui |
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| Institution: | 1. Institute of Electronics, Bulgarian Academy of Sciences, Tsarigradsko Chaussee 72, Sofia 1784, Bulgaria;2. Aix-Marseille University, CNRS, LP3 Laboratory, Marseille 13288, France;3. Institute of Experimental Pathology and Parasitology, Bulgarian Academy of Sciences, G. Bonchev Street, bl. 25, Sofia 1113, Bulgaria;4. Institute of Optical Materials and Technologies, Bulgarian Academy of Sciences, G. Bonchev Street, bl. 109, Sofia 1113, Bulgaria;1. College of Opto-electronics Engineering, Changchun University of Science and Technology, Changchun 130022, China;2. College of Science, Changchun University of Science and Technology, Changchun 130022, China;1. College of Opto-electronics Engineering, Changchun University of Science and Technology, Changchun 130022, China;2. College of Science, Changchun University of Science and Technology University, Changchun 130022, China;3. National Key Lab of High Power Semiconductor Lasers, Changchun University of Science and Technology, Changchun 130022, China;1. Senju Metal Industry Co., Ltd., 1 Matsuyama, Moka, Tochigi 321-4346, Japan;2. Department of Applied Chemistry, Kyushu Institute of Technology, 1-1 Sensui-cho, Tobata-ku, Kitakyushu 804-8550, Japan;1. Solid State Electronics Lab, TU Dresden–Helmholtzstrasse 18, 01062 Dresden, Germany;2. Chair of Metals Science and Technology, Friedrich-Alexander-Universität Erlangen-Nuremberg-Martensstrasse 5, 91058 Erlangen, Germany |
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| Abstract: | Output performance of a continuous-wave (CW) laser diode end-pumped passively Q-switched Tm,Ho:YLF laser is demonstrated with a Cr:ZnS crystal as the saturable absorber. We particularly investigate the influence of saturable absorber's position in the resonator when the Cr:ZnS crystal is placed close to and far from the laser beam waist. We compare the experimental results at the two different positions, and find that the laser shows unusual output characteristics when the Cr:ZnS saturable absorber is placed close to the beam waist. The pulse width and the pulse energy almost keep constant, measured about 1.25 μs and 4 μJ respectively, when the pump power is changed in the range of 1–1.9 W. Moreover, the pulse repetition frequency can be tuned between 1.3 kHz and 2.6 kHz by changing the pump power. The output wavelength of the passively Q-switched laser shifts to 2053 nm from 2067 nm in CW operation. |
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