Author Affiliations
Abstract
Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
Large aperture Nd:phosphate laser glass is a key optical element for an inertial confinement fusion (ICF) facility. N31, one type of neodymium doped phosphate glasses, was developed for high peak power laser facility applications in China. The composition and main properties of N31 glass are given, together with those of LHG-8, LG-770, and KGSS- 0180 Nd:phosphate laser glasses, from Hoya and Schott, and from Russia. The technologies of pot melting, continuous melting, and edge cladding of large size N31 phosphate laser glass are briefly described. The small signal gain profiles of N31 glass slabs from both pot melting and continuous melting at various values of the pumping energy of the xenon lamp are presented. N31 glass is characterized by a stimulated emission cross section of 3:8 10??20 cm2 at 1053 nm, an absorption coefficient of 0.10–0.15% cm??1 at laser wavelength, small residual stress around the interface between the cladding glass and the laser glass, optical homogeneity of 2 10??6 in a 400 mm aperture, and laser damage threshold larger than 42 J/cm2 for a 3 ns pulse width at 1064 nm wavelength.
neodymium phosphate laser glass large aperture glass ICF facility High Power Laser Science and Engineering
2014, 2(1): 010000e1
中国科学院 上海光学精密机械研究所， 上海 201800
在概述国内外高功率激光钕玻璃的发展及其主要性质的基础上，重点论述了上海光学精密机械研究所在大口径N31高功率激光钕玻璃半连续熔炼工艺、连续熔炼工艺、包边工艺等方面的研究进展。报道了半连续熔炼工艺制备的不同Nd2O3浓度N31钕玻璃的光吸收损耗和荧光寿命及小信号增益系数，并给出了这些钕玻璃坯片小信号增益系数的波动范围。通过对半连续熔炼和连续熔炼工艺制备的N31激光钕玻璃主要性能的比较，证明连续熔炼工艺制备的N31钕玻璃的主要性能指标与半连续熔炼的性能相当。对于400 mm大口径N31钕玻璃坯片的包边进行了模拟考核，结果表明,采用现有包边工艺的钕玻璃可以承受1 000次高功率氙灯辐射。
高功率激光 钕玻璃 大口径 惯性约束聚变 high power laser neodymium laser glass large aperture inertial confinement fusion 强激光与粒子束
2011, 23(10): 2560
1 中国科学院 上海光学精密机械研究所,上海 201800
2 美国Kigre公司,Hilton Head South Carolina 29926
旋光玻璃广泛用于激光的调制、偏转、开关和高功率激光系统的隔离器。旋光玻璃的主要性质为费尔德常数。含高顺磁离子的旋光玻璃具有大的费尔德常数,可见区高透过等优点。具有较大磁矩和较低f-d跃迁能隙的顺磁离子铽应具有大的费尔德常数。本工作以高Tb2O3含量的Tb2O3-B2O3-Al2O3-SiO2为基本系统。研究玻璃的形成;测定了不同Tb3+离子浓度时的费尔德常数,符合线性关系;调整玻璃组成以避免析晶,发展了波长632 nm的费尔德常数为75.1-116.4 rad/(T·m)的TG20,TG28,TG32旋光玻璃系列。建立了10升规模铂坩埚高温熔炉,成形和退火设备。形成口径30 cm旋光玻璃的生产能力。产品的1054 nm光吸收小于0.008 cm-1,1 ns的激光破坏阈值大于8 J/cm2,透过波前畸变小于五分之一波长。所制造的旋光玻璃已用于美国Lawrence Livermore国家实验室,中国“神光Ⅱ”升级,英国Rutherford实验室的Vulcan Laser System和CNRS CEA Luli等高功率激光系统。
光学材料 光学玻璃 费尔德常数 旋光玻璃 顺磁离子 氧化铽
Author Affiliations
Abstract
1 Shanghai Institute of Optics &
2 Fine Mechanics, Chinese Academy of Sciences, Shanghai, 201800
The effects of Al2O3, Yb2O3, Er2O3 and OH- on spectral properties of P2O5.Na2O.SrO.Al2O3.Yb2O3.Er2O3 erbium phosphate glass were studied. 5, 8, and 13 mol% Al2O3, 4, 5, 6, 7 and 8 mol% Yb2O3 and 0.05, 0.2, and 0:4 mol% Er2O3 were used. It was found that Al2O3 can improve fluorescent lifetime of Er3+ ions, but the integrated absorption cross section of Er3+ ions decreases with the increase of Al2O3 concentration. Evaluating from energy transfer efficiency of Yb3+ to Er3+ and spectral parameters of Yb3+ and Er3+, we conclude that 6 mol% Yb2O3 and 0:4 mol% Er2O3 are needed for LD pumped microchip laser applications. OH- groups in glass affect greatly fluorescent intensity and lifetime of Er3+, Yb3+:phosphate glass. The OH- absorption coefficient at 3000 cm^(-1) should be less than 1 cm^(-1) for laser applications. Pumped with a 2-W, 974-nm InGaAs laser diode, CW laser centered at 1530 nm with slope efficiency of 10:6 % and maximum output of 43 mW was achieved in our 2-mm-thick Er3+, Yb3+:phosphate glass at room temperature.
160.5690 rare earth doped materials 300.6170 spectra 140.3500 lasers erbium Chinese Optics Letters
2003, 1(1): 0137
研制了三种具有高受激发射截面、热光稳定的磷酸盐激光玻璃.给出主要光谱参数和激光性能.该玻璃已获应用.
磷酸盐激光玻璃
鉴别了磷酸盐玻璃中由水引起的六条红外光谱吸收带;确定了3.47μm吸收带吸收系数与Nd3+荧光寿命的关系;详细测定了熔炼过程中水含量的变化.结果表明,干燥气体停止鼓泡以后玻璃水含量明显增加.应用RAP法消除了磷酸盐激光玻璃中的水,易制得K3.47μmOH=1的玻璃.
在氟磷酸盐激光玻璃中,由分相和析晶产生的固体夹杂物是光散射和激光损伤的主要原因。Fe、Cu;Ni、Si等杂质的不均匀沉积作用,使激光破坏阈值进一步降低。
氟磷玻璃作为光学玻璃及激光工作物质,正在获得应用。在研究Al(PO_3)_3系统玻璃的生成及结构的基础上,本文研究了光学及其它物理性质。Al(PO_3)_3含量低的氟磷玻璃,网络结构受到极大的破坏,处于破坏区,性质变化及各种氟化物对性质的影响与处于破坏区的氧化物玻璃相似。LiF、MgF_2和AlF_3等氟化物的特殊作用在物理性质变化方面也得到反映。同时,与硅酸盐和硼酸盐等玻璃生成体含量高的玻璃比较,静电吸引力对Al(PO_3)_3含量低的氟磷玻璃的性质变化起着更大的作用。文中表示所研究玻璃在n_d～v_d图中的位置,给出低Al(PO_3)_3含量玻璃中的部分性质,与文献数据进行比较,并把部分性质的变化与Al(PO_3)_3含量相联系.
