偏硼酸钡晶体对染料激光倍频产生可调谐紫外激光

介绍了一种用氮分子激光泵浦的带有一级放大的染料激光器，再由ＢＢＯ晶体倍频，获得了波长为 ２１７．５ ｎｍ到 ３０９．０ ｎｍ的可调谐紫外相于光，并测得波长分别为４７０．０， ５０７．４， ５４６．０ ｎｍ，三处的倍频光最大信频转换效率为 ５％， ９％． １２％。分析表明，这些结果与理论相符合．     

准连续钛宝石激光器中调谐紫外光源的产生

利用两块β－ＢａＢ２ Ｏ４（ＢＢＯ）晶体有效实现对平均功率为４００ ｍ Ｗ 左右、重复频率为１０ ｋＨｚ的准连续调谐钛宝石激光的倍频,获得了波长范围为３６０～４７６ ｎｍ 的调谐紫外及可见光源;利用和频效应获得了调谐范围为２４０～２６０ ｎｍ 的三次谐波     

（C_6H_5）_3PO·p－ClC_6H_4OCH_2COOH的晶体结构

合成了（Ｃ６Ｈ５）３ＰＯ·ｐ－ＣｌＣ６Ｈ４ＯＣＨ２ＣＯＯＨ并解析了其单晶体结构。结果表明该晶体属于正交晶系，空间群是Ｐｂｃａ，ａ＝１．７１２２（４）ｎｍ，ｂ＝２．３８０３（７）ｎｍ，ｃ＝１．１３２８（４）ｎｍ，该晶体由三苯基氧膦和对氯苯氧乙酸组成，但晶体中对氯苯氧乙酸同单独的对氯苯氧乙酸晶体结构比较，相应的键长和键角有明显的差异。     

人工紫晶中的色心及其吸收光谱

本文报导了α－ＳｉＯ２：Ｆｅ（３＋）石英晶体的水热法Ｚ面生长技术，经Ｃｏ６０γ射线室温辐照赋色后晶体呈鲜艳的紫色，测试了着色晶体的色心吸收带，至四个主吸收带，峰值分别位于３４５ｎｍ，５５０ｎｍ，８２０ｎｍ和１４００ｎｍ，本文讨论了晶体色心的形成及模型，并用群论和分子轨道理论分析解释了色心吸收谱的实验结果。     

氩离子激光器的倍频系统

为了获得用于制取全息高频光栅的光源，研制了Ａｒ离子激光器的腔外二倍频系统。采用ＡＤＰ晶体的温度位相匹配法，以半导体致冷器作为冷源，石英晶振用作测温传感器，并将ＰＩＤ实时控制算法用于智能型精密测控温系统中，研制出了控温精度达 ０． ０５ ℃的恒温装置。成功地实现了氩离子激光器的腔外倍频系统，将波长为５１４．５ ｎｍ的可见光信频得到波长为２５７． ３ ｎｍ的远紫外相干光，用这种光源可制得超高频全息光栅。     

SYNTHESIS AND STRUCTURE OF HYDRATED LANTHANUM CARBONATE

以碳酸氢铵为沉淀剂合成了碳酸镧晶体。经Ｘ射线衍射测定，晶体属正交晶系，晶胞参数ａ＝０．８４８７ｎｍ，ｂ＝０．９５６４ｎｍ，ｃ＝０．４４８６ｎｍ。其结构与文献中提到的镧石型稀土碳酸盐的结构相接近。碳酸镧的红外光谱说明其内部存在着非等价的碳酸盐群。碳酸镧在热分解过程中，存在着稳定的中间产物Ｌａ２Ｏ３·ＣＯ２。     

TmxY1—xAl3（BO3）4晶体生长和光谱特性

用Ｋ２Ｍｏ３Ｏ１０－Ｂ２Ｏ３作助熔剂，采用缓慢降温自发成核的方法，生长了稀土四硼酸盐晶体ＴｍｘＹ１－ｘＡｌ３（ＢＯ３）４（简称ＴＹＡＢ），晶体尺寸为８×６×５ｍｍ３．对所获得晶体进行Ｘ射线结构分析，表明ＴＹＡＢ晶体属三方晶系，晶胞参数ａ＝９．２３７，ｃ＝７．１９２．测定了该晶体室温下的红外光谱、反射光谱、激发光谱及荧光光谱，当用２６１ｎｍ波长激发时，可产生３４５ｎｍ（３Ｐ０→３Ｈ４）蓝紫色及４５０ｎｍ（１Ｄ２→３Ｈ４）蓝绿色的荧光发射     

二水合磷酸钛晶胞参数计算及其X射线粉末图谱的指标化

采用伊滕（Ｉｔｏ）法，对无机离子交换剂Ｔｉ（ＨＰＯ４）２·２Ｈ２Ｏ的晶胞参数和衍射指标进行了计算．确定该晶体属单斜晶系，简单单斜点阵．晶胞参数为：ａ＝０．７１４ｎｍ，ｂ＝２．３０２ｎｍ，ｃ＝０．６８０ｎｍ，β＝１１１．４°     

水热晶化法合成BaHPO4单晶及结构研究

采用水热合成法成功地培养出一种新物相，ＢａＨＰＯ＿４羊晶体。四圆ｘ射线衍射结构测定证明，晶体属于正交晶系，空间群为Ｐｂｎｍ，晶胞参数ａ＝０．４６０５（１），ｂ＝１．４１７５，（３），ｃ＝１．７１８６（９）ｎｍ，晶胞体积Ｖ＝１．１２１９ｎｍ￣３．晶体由ＨＯＰＯ＿３基团和Ｂａ原子构成，结构中含有ＨＯＰＯ＿３基团构成的平行于（００１）方向的链，多组链再形成两组不同取向的片层结构。晶体结构解析的最终偏离因子Ｒ＝０．０６６：加权因子Ｒ＿ｗ＝０．０６６。     

7.5 mol% Nb:KTP晶体的主折射率温度系数的计算

阐述了７．５ｍｏｌ％Ｎｂ：ＫＴｉＯＰＯ４（Ｎｂ：ＫＴＰ）晶体在室温至１５０℃,波长分别为５３９．７５ｎｍ、６３２．８ｎｍ、１．０７９．５ｎｍ和１３４１．４ｎｍ下,主折射率温度系数的测量结果和计算结果,给出了计算７．５ｍｏｌ％Ｎｂ：ＫＴＰ晶体主折射率温度系数的两个表达式,分别用它们计算得该晶体的主折射率温度系数同实验测量值符合,最大偏差分别为１６．６％和１４％。通过比较ＫＴＰ和７．５％ｍｏｌ％Ｎｂ：ＫＴＰ晶体在这四个波长下主折射率温度系数可看出,两主折射率温度系数相当。     

LD侧面泵浦Nd:YAG1064 nm/532 nm/660 nm三波长激光器

理论上分析了实现双波长激光同时振荡腔镜反射率等需要满足的条件。实验中利用LD侧面泵浦单根Nd:YAG晶体,同时采用声光调Q与非线性频率变换技术,在3个子谐振腔组成的新型全固态激光实验系统中实现了1 064 nm/532 nm/660 nm三波长激光单独输出与同时输出。在泵浦功率103 W时,1 064 nm激光单独输出功率为15.5 W,532 nm和660 nm激光在声光调制频率分别为10.5 kHz和11.5 kHz时输出功率分别为4.7 W和1.6 W,转换效率分别为4.6%和1.6%。当三波长激光同时输出时,1 064 nm/532 nm/660 nm三波长激光输出功率分别为10.1 W、4.3 W和1.0 W,同时测量输出功率不稳定度均小于2.0%。理论与实验符合较好。     

飞秒激光脉冲倍频的实验研究

利用2mmKDP晶体对中心波长790nm、脉冲宽度75fs、晶体表面强度约1011W/cm2的超短超强激光脉冲进行了倍频实验研究。通过对基频脉冲能量及频率啁啾的优化,可以获得高于40%的能量转化效率。观测了基频脉冲频率啁啾对倍频光产生的影响,发现激光脉冲啁啾为零时对应的倍频转化效率最高;对于相同的光栅相对位置,正啁啾基频脉冲的倍频转化效率高于负啁啾。     

K2Al2B2O7(KABO)晶体的倍频性质

研究了KABO晶体的倍频性质 ,包括相位匹配角、非线性光学系数、容限角、走离角等 .当基频光为 6 .5mJ的10 6 4nm皮秒激光时 ,KABO晶体的倍频输出为 1.92mJ,相应转换效率为 2 9.5 % ,其有效非线性光学系数约为 0 .4pm V .     

高重复率LiF:F_2~-色心调Q的YAG倍频激光器

本文阐述了作者研制的LiF:F_2~-晶体色心调Q的YAG倍频激光器.该激光器输出高重复率、高峰值功率、窄脉宽的脉冲蓝绿激光,适用于机载激光雷达进行大面积、高深度、高精度的海洋探测.文中还介绍了这种激光器输出激光的偏振性、脉冲宽度和能量的稳定性等实验结果.     

Orthogonally linear polarized lasers(Ⅰ)--principle and devices

Two kinds of orthogonally polarized lasers, i.e. Zeeman dual-frequency lasers and four-frequency ring lasers (laser gyros) have been developed since the invention of lasers, in which circularly polarized lights oscillate. This paper summarizes recent progress of the study on orthogonally linear polarized lasers with the standing wave cavity. Firstly, the expression of producing orthogonally linear polarized lights in standing wave cavity, i.e. laser frequency splitting, is given. Almost all the birefringence effects made in laser cavity are used to produce orthogonally linear polarized lights. The effect includes quartz crystal birefringence effect, calcite birefringence effect,stress (photo-elastic) birefringence effect and electro-optical birefringence effect. Secondly, several physical phenomena of orthogonally linear polarized lasers are discovered such as aberrance of frequency splitting curves caused by optical activity of quartz crystal, order-passing of longitudinal modes with frequency splitting and strong modes competition. Finally, because the traditional Zeeman dual frequency laser cannot output frequency difference larger than 3 MHz, the approaches of obtaining larger frequency difference are studied. The sequential results, several kinds of orthogonally polarized lasers, are described, such as birefringence dual frequency lasers outputting a frequency difference from 40 MHz to hundreds of megahertz, birefringence-Zeeman dual frequency lasers outputting a frequency difference from 1 MHz to hundreds of megahertz, the LD pumped YAG birefringence dual frequency laser outputting frequency difference of several gigahertz, and the lasers whose longitudinal mode spacing is c/4L instead of c/2L.     

Orthogonally linear polarized lasers (I) — principle and devices

Two kinds of orthogonally polarized lasers, i.e. Zeeman dual-frequency lasers and four-frequency ring lasers (laser gyros) have been developed since the invention of lasers, in which circularly polarized lights oscillate. This paper summarizes recent progress of the study on orthogonally linear polarized lasers with the standing wave cavity. Firstly, the expression of producing orthogonally linear polarized lights in standing wave cavity, i.e. laser frequency splitting, is given. Almost all the birefringence effects made in laser cavity are used to produce orthogonally linear polarized lights. The effect includes quartz crystal birefringence effect, calcite birefringence effect, stress (photo-elastic) birefringence effect and electro-optical birefringence effect. Secondly, several physical phenomena of orthogonally linear polarized lasers are discovered such as aberrance of frequency splitting curves caused by optical activity of quartz crystal, order-passing of longitudinal modes with frequency splitting and strong modes competition. Finally, because the traditional Zeeman dual frequency laser cannot output frequency difference larger than 3 MHz, the approaches of obtaining larger frequency difference are studied. The sequential results, several kinds of orthogonally polarized lasers, are described, such as birefringence dual frequency lasers outputting a frequency difference from 40 MHz to hundreds of megahertz, birefringence-Zeeman dual frequency lasers outputting a frequency difference from 1 MHz to hundreds of megahertz, the LD pumped YAG birefringence dual frequency laser outputting frequency difference of several gigahertz, and the lasers whose longitudinal mode spacing is c4L instead of c2L.     

532 nm单频Nd:YVO4/KTP激光器及碘吸收谱线观测的研究

用Nd:YVO4/KTP内腔倍频激光器在515 mW抽运时,获得了40.4 mW的单频532 nm绿光.分析了获得单频运转的原因,并从理论上分析、实验中验证了用增加腔长的办法,可减小自由运转激光器的频率漂移.用其单频输出观测到1997年国际米定义咨询委员会(CCDM)推荐谱线以外的一些新的12吸收谱线.     

1319nm与660nm双波长Nd:YAG激光器的研究

为研究获得高功率红光的有效方法,研制了一种准连续输出1319nm与660nm双波长Nd:YAG激光器.文中分析了波长1319nm激光的辐射跃迁能级,论述了抑制1064nm激光的生成从而提高1319nm激光输出等关键技术,研究了光学镜片的镀膜参数与腔型结构,实现1319nm激光连续输出最高功率43W,以1319nm激光为基频,置入KTP晶体内腔倍频,并设置声光Q开关,获得660nm红光准连续输出2W,实现1319nm与660nm双波长输出.     

温度对LiNbO3晶体THz辐射产生效率的影响

利用超短激光脉冲泵浦电光晶体LiNbO₃产生脉冲THz辐射, 并用非线性光学差频原理解释了THz的产生机制. 改变泵浦激光能量, 实验结果表明, THz脉冲波形的最大振幅与泵浦激光能量为平方关系, 随泵浦能量的增大, 晶体温度逐渐升高, 增加了对所产生THz辐射的吸收, 并逐渐偏离平方关系. 通过降低晶体温度, 减小TO声子-极化子因非谐振衰减为两个声学声子而引起的THz吸收, 提高了THz的产生效率. 