Influence of transverse feedback on an optically pumped mirrorless sub-mm laser |
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| Affiliation: | 1. Laboratory of Micro-Nano Photonic and Optoelectronic Materials and Devices, Key Laboratory of Materials for High Power Laser, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China;2. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China;3. Shanghai Key Laboratory of All Solid-State Laser and Applied Techniques, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China;4. Shandong Advanced Optoelectronic Materials and Technologies Engineering, Laboratory of Qingdao, School of Mathematics and Physics, Qingdao University of Science and Technology, Qingdao 266061, China;1. State Key Laboratory of Crystal Materials and Institute of Crystal Materials, Shandong University, 27 Shanda Nanlu, Jinan 250100, China;2. School of Information Science and Engineering and Key Laboratory of Laser and Infrared System of Ministry of Education, Shandong University, Qingdao 266237, China;1. Research Center of Laser Crystal, Key Laboratory of Materials for High Power Laser, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China;2. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | The experimental study of short mirrorless 496 μm CH3F and 385 μm D2O lasers demonstrates the strong influence of transverse feedback on the emitted pulses in forward direction. The increase of transverse feedback leads to a new simple and passive method for pulse shortening, tail suppression and improvement of pulse structure without significant loss of sub-millimeter sub-mm peak power. Using a 0.4 J CO2 pump laser, monochromatic, linear polarized kW pulses with some 10 ns pulse length are observed. The reliability of tail elimination is tested with a highly sensitive superconducting bolometer detector. The new quenching method allows the generation of short, smooth single-pulses and offers other possibilities for the development and application of mirrorless sub-mm lasers. |
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