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16 December 2022 Passively mode-locking operation of infrared solid-state lasers with a nickel-cobalt layered double hydroxide nanosheets saturable absorber
Enlin Cai, Xiangpeng Cui, Leilei Guo, Xiaoyan Fan, Shuaiyi Zhang, Bin Zhao, Fei Lou
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Proceedings Volume 12501, Seventeenth National Conference on Laser Technology and Optoelectronics; 1250114 (2022) https://doi.org/10.1117/12.2656496
Event: Seventeenth National Conference on Laser Technology and Optoelectronics, 2022, Shanghai, China
Abstract
Due to the advantages of ultra-broad bandwidth absorption and easy fabrication, passively mode-locked ultrashort lasers using two-dimensional (2D) materials as saturable absorbers (SA) have attracted extensive attention in recent years. In this experiment, the structure and light absorption properties of 2D nickel-cobalt layered double metal hydroxide (NiCo-LDH) nanosheets are characterized. The nonlinear absorption coefficient of NiCo-LDH are measured by Z-scan method to be -1.1 cm/GW. Using the NiCo-LDH SA, passively mode-locking is realized in a Nd:YVO4 bulk laser near 1 μm, a Nd:Y0.15V0.85O4 bulk laser near 1.3 μm and a Tm:YAG ceramic bulk laser near 2 μm. In the 1 μm passively mode-locking experiment, a continuous wave mode-locking (CWML) laser is obtained at 1065.92 nm with a repetition rate of 69 MHz and a pulse width of 18.0 ps. To our knowledge, this is the first time a CWML laser has been obtained using a layered double hydroxides (LDHs) SA. In addition, Q-switched mode-locking (QML) lasers are obtained based on NiCo-LDH SA at 1.3 μm and 2 μm. The experiments demonstrate that NiCo-LDH mode locking is a very promising practical technique for directly generating ultrashort pulsed laser from a laser oscillator.
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Enlin Cai, Xiangpeng Cui, Leilei Guo, Xiaoyan Fan, Shuaiyi Zhang, Bin Zhao, and Fei Lou "Passively mode-locking operation of infrared solid-state lasers with a nickel-cobalt layered double hydroxide nanosheets saturable absorber", Proc. SPIE 12501, Seventeenth National Conference on Laser Technology and Optoelectronics, 1250114 (16 December 2022); https://doi.org/10.1117/12.2656496
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KEYWORDS
Lasers
Mode locking
Nanosheets
Crystals
2D materials
Absorption
Ceramics
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