1mJ窄线宽掺镱脉冲光纤放大器
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摘要
通过将固体激光器种子源与光纤放大技术相结合的方式,报道了一个单脉冲能量约为1 mJ,同时窄线宽保持在约0.1 nm的大模场面积的掺镱脉冲光纤放大器。不同于传统固体种子源一级大芯径光纤放大结构,所采用的两级掺镱双包层光纤(YDCF)放大结构空间耦合调节更简单。放大过程中采用了多种非线性效应抑制方法,放大输出光中未出现明显的SBS、SRS等非线性效应,信噪比超过30 dB。放大后平均功率10.07 W,相比0.38 W的种子光提高了14.23 dB。在10 kHz重复频率下,单脉冲能量约1 mJ,输出光脉宽50 ns,放大输出光束质量M~2=3.72。所实现的毫焦量级窄线宽脉冲光纤放大器可运用于激光遥感、激光测量及非线性频率变换等应用领域。
By combining a large mode area(LMA) Yb-doped double cladding fiber(YDCF) amplifier with a solid state seed laser, an fiber amplifier, whose single pulse power was about 1 mJ and narrow linewidth was about 0.1 mJ, was reported. Different from the traditional one-stage fiber amplifer with solid state laser seed source, a two-stage large diameter fiber amplifer was used in the YDCF amplification system. The two-stage fiber amplifer was much simpler in the aspect of coupling the spatial seed light into the fiber. A variety of methods were used to suppress nonlinear effects during the amplification process. Obvious nonlinear effects such as SBS, SRS, were not observed in the output, with the SNR exceeding 30 dB. After YDCF amplification system, the output average power was amplified to10.07 W. Compared to the power of seed, which was about 0.38 W, the output was increased by 14.23 dB.At the pulse repetition rate of 10 kHz, the pulse energy is about 1 mJ, with the pulse width of 50 ns. The beam quality M~2 of the output laser is 3.72. The pulsed fiber amplifier with narrow linewidth and high pulse energy will be very useful in many practical applications, such as laser remote sensing, laser measurement and nonlinear frequency conversion and so on.
By combining a large mode area(LMA) Yb-doped double cladding fiber(YDCF) amplifier with a solid state seed laser, an fiber amplifier, whose single pulse power was about 1 mJ and narrow linewidth was about 0.1 mJ, was reported. Different from the traditional one-stage fiber amplifer with solid state laser seed source, a two-stage large diameter fiber amplifer was used in the YDCF amplification system. The two-stage fiber amplifer was much simpler in the aspect of coupling the spatial seed light into the fiber. A variety of methods were used to suppress nonlinear effects during the amplification process. Obvious nonlinear effects such as SBS, SRS, were not observed in the output, with the SNR exceeding 30 dB. After YDCF amplification system, the output average power was amplified to10.07 W. Compared to the power of seed, which was about 0.38 W, the output was increased by 14.23 dB.At the pulse repetition rate of 10 kHz, the pulse energy is about 1 mJ, with the pulse width of 50 ns. The beam quality M~2 of the output laser is 3.72. The pulsed fiber amplifier with narrow linewidth and high pulse energy will be very useful in many practical applications, such as laser remote sensing, laser measurement and nonlinear frequency conversion and so on.
引文
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[2]Bai Yan,Yang Chunmei,Wu Zhe,et al.Microtopography experiment of laser ablation on surface of special-shaped solid wood[J].Optics and Precision Engineering,2016,24(10s):123-128.(in Chinese)白岩,杨春梅,吴哲,等.激光烧蚀实木异型表面的微观形貌实验[J].光学精密工程,2016,24(10s):123-128.
[3]Li Yizhe,Xue Bin,Zhao Yiyi.Development of wide field of view technology of synthetic aperture lidar[J].Optics and Precision Engineering,2016,24(10s):300-308.(in Chinese)李一哲,薛斌,赵意意.合成孔径激光雷达大视场技术综述[J].光学精密工程,2016,24(10s):300-308.
[4]Ye C,Gong M,Yan P,et al.Linearly polarized single transverse mode high energy multi-ten nanosecond fiber amplifier with 50W average power[J].Optics Express,2006,14(17):7604.
[5]Wang X,Zhou P,Su R,et al.A 280 W high average power,single-frequency all-fiber nanosecond pulsed laser[J].Laser Physics,2013,23(1):015101.
[6]Fang Q,Shi W,Fan J.700-kW-peak-power monolithic nanosecond pulsed fiber laser[J].Photonics Technology Letters IEEE,2014,26(16):1676-1678.
[7]Zhao Xinghai,Gao Yang,Xu Meijian,et al.Power delivery characteristics of fibers for high-peak power pulse laser[J].Infrared and Laser Engineering,2008,37(3):444-448.(in Chinese)赵兴海,高杨,徐美健,等.高峰值功率脉冲激光的光纤传能特性[J].红外与激光工程,2008,37(3):444-448.
[8]Wang C,Zhang Q,Mou C,et al.Spectral polarization spreading behaviors in stimulated Brillouin scattering of fibers[J].IEEE Photonics Journal,2017,9(1):1-11.
[9]Liu Guangbo,Yang Yifeng,Wang Jianhua,et al.Stimulated Brillouin scattering enhancement factor improvement in a11.6-GHz-linewidth 1.5-kW Yb-doped fiber amplifier[J].Chinese Physics Letters,2016,33(7):94-97.
[10]Chen Xuekun,Zhang Lu,Wu Zhiyong,et al.Coupling efficiency of free-space laser coupling into single mode fiber and photonic crystal fiber[J].Chinese Optics,2013,6(2):208-215.(in Chinese)陈雪坤,张璐,吴志勇,等.空间激光与单模光纤和光子晶体光纤的耦合效率[J].中国光学,2013,6(2):208-215.
[11]Liao Suying,Gong Mali.New progress of large mode area fibers[J].Infrared and Laser Engineering,2011,40(3):455-462.(in Chinese)廖素英,巩马理.大模场光纤研究的新进展[J].红外与激光工程,2011,40(3):455-462.
[12]Huang Xiaodong,Zhang Xiaomin,Wang Jianjun,et al.Stimulated Brillouin scattering in high-power fiber amplifier[J].Infrared and Laser Engineering,2011,40(11):2124-2128.(in Chinese)黄小东,张小民,王建军.等.高功率光纤放大器中的受激布里渊散射[J].红外与激光工程,2011,40(11):2124-2128.
[13]Zhang H T,Zheng C,Yan P,et al.13.9-mJ all fiber wide band ytterbium-doped fiber amplifier 13.9-mJ all fiber wide band ytterbium-doped fiber amplifier[J].Laser Physics Letters,2012,9(10):744-747.
[14]Liu Liang,Cui Junwei,Li Wenjing,et al.Yb3+-doped double-clad quasi-continuous wave fiber laser pumped by laser diode[J].Chinese Optics,2012,5(6):663-670.(in Chinese)刘亮,崔俊伟,李文景,等.LD泵浦的准连续输出双包层掺镱光纤激光器[J].中国光学,2012,5(6):663-670.