半导体激光密集谱合束中VBG的热效应
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摘要
研究并分析了半导体激光密集谱合束技术中体布拉格光栅(VBG)的热效应问题。为了提高半导体激光器的输出功率及其电光转换效率,利用COMSOL软件模拟了半导体激光器中VBG在自由传导散热和水循环冷却两种条件下的温度分布,通过对比这两种条件下VBG温度对其中心波长漂移量及输出功率的影响,分析了VBG热效应变化。模拟与实验结果表明,水循环冷却可以有效将VBG的温度从390.44 K降低到299.09 K,减小了VBG的波长漂移量,有效抑制了VBG的热效应问题。因此合理控制VBG的温度,可提高半导体激光器的输出功率和电光转换效率。
The thermal effect of the volume Bragg grating(VBG) in semiconductor laser dense spectrum combining technology was studied and analyzed. In order to improve the output power and electro-optic conversion efficiency of the semiconductor laser, the temperature distributions of VBG in the semiconductor laser under free conduction cooling and water cycle cooling were simulated by COMSOL software. The variation of VBG thermal effect was analyzed by comparing the effects of VBG temperature on the central wavelength drift and output power under the two conditions. The simulation and experiment results show that the temperature of the VBG is reduced from 390.44 K to 299.09 K effectively under water cycle cooling, the wavelength drift of VBG is reduced, and the VBG thermal effect is suppressed effectively. Therefore reasonably controling the temperature of the VBG can improve the output power and the electro-optic conversion efficiency of the semiconductor laser.
The thermal effect of the volume Bragg grating(VBG) in semiconductor laser dense spectrum combining technology was studied and analyzed. In order to improve the output power and electro-optic conversion efficiency of the semiconductor laser, the temperature distributions of VBG in the semiconductor laser under free conduction cooling and water cycle cooling were simulated by COMSOL software. The variation of VBG thermal effect was analyzed by comparing the effects of VBG temperature on the central wavelength drift and output power under the two conditions. The simulation and experiment results show that the temperature of the VBG is reduced from 390.44 K to 299.09 K effectively under water cycle cooling, the wavelength drift of VBG is reduced, and the VBG thermal effect is suppressed effectively. Therefore reasonably controling the temperature of the VBG can improve the output power and the electro-optic conversion efficiency of the semiconductor laser.
引文
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[10] ZHU H B, LIU X C, ZHANG Y W, et al. kW-class fiber-coupled diode laser source based on dense spectral multiplexing of an ultra-narrow channel spacing [J].Optics Express, 2018, 26(19): 24723-24733.
[11] HENGESBACH S, HOLLY C, KRAUCH N, et al. High-power dense wavelength division multiplexing (HP-DWDM) of frequency stabilized 9xx diode laser bars with a channel spacing of 1.5 nm [J]. Proceedings of SPIE-the International Society for Optical Engineering, 2014, 8965: 89650C-1-89650C-9.
[12] ZHU H B, LIN X C, HAO M M, et al. Design and optimization of the combination film in 10 kW diode laser cladding source [J]. Proceedings of SPIE, 2015, 9621: 96210K-1-96210K-10.
[13] KOENNING T, ALEGRIA K, WANG Z L, et al. Macro-channel cooled, high power, fiber coupled diode lasers exceeding 1.2 kW of output power [J]. Procee-dings of SPIE, 2011, 7918: 79180E-1-79180E-8.
[2] VIJAYAKUMAR D, JENSEN O B, OSTENDORF R, et al. Spectral beam combining of a 980 nm tapered diode laser bar[J]. Optics Express, 2010, 18(2):893-898.
[3] BECKER F, NEUMANN B, WINKELMANN L, et al. Multi-kW CW fiber oscillator pumped by wavelength stabilized fiber coupled diode lasers [J]. Proceedings of SPIE, 2013, 8601: 860131-1-860131-9.
[4] VOLODIN B L, DOLGY S V, MELNIK E D, et al. Wavelength stabilization and spectrum narrowing of high-power multimode laser diodes and arrays by use of volume Bragg gratings[J]. Optics Letters, 2004, 29(16): 1891-1893.
[5] 刘莉,谭吉春,郑光威,等.基于体布拉格光栅的波束合成技术研究及实现[J].国防科技大学学报,2010,32(2):157-162.LIU L, TAN J C, ZHENG G W, et al. Research and implementation of volume Bragg gratings for beam combination [J]. Journal of National University of Defense Technology, 2010, 32(2): 157-162(in chinese).
[6] PE?ANO J, SPRANGLE P, TING A, et al. Optical quality of high-power laser beams in lenses [J]. Journal of the Optical Society of America: B, 2009, 26(3): 503-510.
[7] MAHDIEH M H, JAFARABADI M A, AHMADINEJAD E, et al. Thermal lens effect induced by high power diode laser beam in liquid ethanol and its influence on a probe laser beam quality [J]. Proceedings of SPIE, 2015, 9255:925531-1-925531-7.
[8] K?HLER B, NOESKE A, KINDERVATER T, et al. 11 kW direct diode laser system with homogenized 55×20 mm2 Top-Hat intensity distribution[J]. Proceedings of SPIE, 2007, 6456: 64560O-1-64560O-12.
[9] HENGESBACH S, KRAUCH N, HOLLY C, et al. High-power dense wavelength division multiplexing of multimode diode laser radiation based on volume Bragg gratings [J]. Optics Letters, 2013, 38(16):3154-3157.
[10] ZHU H B, LIU X C, ZHANG Y W, et al. kW-class fiber-coupled diode laser source based on dense spectral multiplexing of an ultra-narrow channel spacing [J].Optics Express, 2018, 26(19): 24723-24733.
[11] HENGESBACH S, HOLLY C, KRAUCH N, et al. High-power dense wavelength division multiplexing (HP-DWDM) of frequency stabilized 9xx diode laser bars with a channel spacing of 1.5 nm [J]. Proceedings of SPIE-the International Society for Optical Engineering, 2014, 8965: 89650C-1-89650C-9.
[12] ZHU H B, LIN X C, HAO M M, et al. Design and optimization of the combination film in 10 kW diode laser cladding source [J]. Proceedings of SPIE, 2015, 9621: 96210K-1-96210K-10.
[13] KOENNING T, ALEGRIA K, WANG Z L, et al. Macro-channel cooled, high power, fiber coupled diode lasers exceeding 1.2 kW of output power [J]. Procee-dings of SPIE, 2011, 7918: 79180E-1-79180E-8.