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用于惯性约束核聚变激光驱动器的激光二极管抽运Nd,Y:CaF_2激光放大器的实验研究 被引量:2

Experimental study of diode-pumped Nd, Y:CaF_2 amplifier for inertial confinement fusion laser driver
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摘要 对Nd,Y:CaF_2晶体作为激光放大器的增益介质进行了报道.研制了一台采用激光二极管面阵五向水平侧面抽运Ф5 mm×70 mm Nd,Y:CaF_2的激光放大器,对其进行了实验研究.测量了Nd,Y:CaF_2晶体的吸收谱、发射谱、以及放大器的荧光分布.在相同的抽运功率下,测量了Nd,Y:CaF_2与Nd:Glass放大器分别工作在10 Hz和1 Hz重复频率时的小信号增益,在抽运功率为9.63 kW时,Nd,Y:CaF_2放大器的小信号增益达6.12,为Nd:Glass的1.5倍.与Nd:Glass相比,Nd,Y:CaF_2晶体的重复工作频率不仅大大提高,而且增益性能也更强.测量了种子光和经Nd,Y:CaF_2放大器后的光谱,能量放大前后光谱几乎无变化. In a conventional laser-driven inertial confinement fusion(ICF), Nd-doped phosphate glass is used as a gain medium.However, the repetition frequency operation of such a laser system is restricted by the low thermal conductivity of the phosphate glass. To attain a high ICF performance, the laser driver must be able to operate at a repetition frequency of no less than 10 Hz. Typically, an Nd-doped laser glass operates at a repetition frequency well below 10 Hz. In this paper,an Nd,Y:CaF2 crystal is taken as a gain medium for the laser amplifier, and experiments are carried out to demonstrate the capability of Nd,Y:CaF2 crystal to act as a gain medium for ICF laser driver. A laser-diode plane-array five-direction horizontal-side-pumped Nd,Y:CaF2 laser amplifier Ф5 mm × 70 mm is developed and an experimental study is carried out. The absorption spectrum and emission spectrum of Nd,Y:CaF2 crystal and the fluorescence distribution of the amplifier are measured. The Nd:CaF2 co-doped with Y3+ions results in a broad absorption band, which makes the laser diode pumping more efficient. The strongest excitation band peak is centered around 796 nm. The small signal gains of Nd,Y:CaF2 and Nd:Glass working respectively at repetition frequencies of 10 and 1 Hz under the same pump power are measured. The small signal gain of Nd,Y:CaF2 amplifier reaches 6.12 under a pump power of 9.63 kW, which is 1.5 times that of Nd:Glass amplifier. The measurements of the spectrum of the seed beam and the spectrum from Nd,Y:CaF2 amplifier show that the signals have no change before and after being amplified. Most likely the Nd,Y:CaF2 crystal is a promising laser material for repetitive ICF laser drivers.
出处 《物理学报》 SCIE EI CAS CSCD 北大核心 2016年第20期108-112,共5页 Acta Physica Sinica
基金 国家重大科研仪器设备研制专项(批准号:ZDYZ2013-2) 科技部创新人才推进计划重点领域创新团队(批准号:2014RA4051) 中国科学院青年创新促进会资助的课题~~
关键词 激光放大器 侧面抽运 小信号增益 ND Y:CaF2 laser amplifier sidepumped small signal gain Nd Y:CaF2
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参考文献15

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