Kerr-lens mode-locked polycrystalline Cr:ZnS femtosecond laser pumped by a monolithic Er:YAG laser |
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| Affiliation: | 1. School of Physics and Optoelectronic Engineering, Xidian University, Xi'an 710071, China;
2. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
3. Department of Physics, Tianshui Normal University, Tianshui 741000, China;
4. Department of Opto-Electronics, Beijing Institute of Technology, Beijing 100081, China |
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| Abstract: | We demonstrated a Kerr-lens mode-locked polycrystalline Cr:ZnS laser pumped by a narrow-linewidth linearpolarised monolithic Er:YAG nonplanar ring oscillator operated at 1645 nm. With a 5-mm-thick sapphire plate for intracavity dispersion compensation, a compact and stable Kerr-lens mode-locking operation was realised. The oscillator delivered 125-fs pulses at 2347 nm with an average power of 80 m W. Owing to the special polycrystalline structure of the Cr:ZnS crystal, the second to fourth harmonic generation was observed by random quasi-phase-matching. |
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| Keywords: | middle-infrared laser mode-locked laser polycrystalline Cr:ZnS |
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