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  

Experimental study of diode-pumped Nd, Y:CaF_2 amplifier for inertial confinement fusion laser driver

作　　者：唐熊忻[1,2,3] 邱基斯[1,2,3] 樊仲维[1,2] 王昊成[1,2] 刘悦亮[1] 刘昊[1,2] 苏良碧[4,5] 

机构地区：[1]中国科学院光电研究院,北京100094 [2]国家半导体泵浦激光工程技术研究中心,北京100094 [3]中科和光(天津)应用激光技术研究所有限公司,天津300304 [4]中国科学院上海硅酸盐研究所人工晶体研究中心,上海201899 [5]中国科学院透明光功能无机材料重点实验室,上海201899

出　　处：《物理学报》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~~

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.

关 键 词：激光放大器 侧面抽运 小信号增益 ND Y:CaF2 

分 类 号：TL632[核科学技术—核技术及应用]