热释电效应对光折变全息光栅读出的影响

先用两束０.２７ｍＷ的６３２.８ｎｍＨｅ-Ｎｅ激光在掺Ｍｎ的ＫＮＳＢＮ晶体中记录光折变全息光栅，再用波长为６２１.８ｎｍ的准连续染料激光读出，观察到衍射光信号有一个从初始最大值衰减到稳定最小值的暂态过程．初始值对稳定值的比可达７.５以上．这一现象可用热释电效应的影响进行解释 关键词：     

激光二极管抽运Nd∶YVO_4晶体1342nm和671nm激光器研究

报道了激光二极管抽运的Ｎｄ∶ＹＶＯ４晶体１３４２和６７１ｎｍ激光特性．１３４２ｎｍ激光最大输出功率为１７５Ｗ，光光转换效率为３２１％，斜效率为４３％．利用Ⅰ类非临界相位匹配ＬＢＯ晶体腔内倍频，当输入抽运功率为６Ｗ时，获得功率为５０２ｍＷ的６７１ｎｍ激光输出，光光转换效率超过８３％；当６７１ｎｍ激光输出功率为４００ｍＷ时，短期的不稳定度小于２％．     

激光二极管直接耦合泵浦的高效率Nd：YVO4／KTP腔内倍频激光器

使激光二极管的发光光面紧贴Ｎｄ：ＹＶＯ４激光晶体，“面对面”直接耦合泵浦，采用ＫＴＰ晶体腔内倍频，在５０３ｍＷ的泵浦功率下，获得５３２ｎｍ基横模绿光输出约７３ｍＷ，光光总体转换效率为１４．５％。     

全光纤波长可调谐调Q激光器

实现了全光纤波长可调谐主动调Ｑ和自调Ｑ激光脉冲输出。波长可调谐范围为５．７ｎｍ。主动调Ｑ激光脉冲的最高峰值功率可达２．６Ｗ,平均功率１ｍＷ。观察到了自调Ｑ现象,且对自调Ｑ现象给予了初步的解释。     

高掺杂Yb3+:磷酸盐玻璃实现高效率、可调谐连续激光运转

采用９４０ｎｍ掺杂蓝宝石激光器作抽运光源,对掺杂的质量分数为１９％高掺杂浓度的Ｙｂ＾３＋磷酸盐玻璃激光器进行了实验研究,获得了１６５ｍＷ的连续激光输出,其中心波长位于１．０５３ｕｍ。实现了同类激光器中５７．８％的高斜率效率,光－光转换效率为３４．２％。激光输出在１．０３８～１．０６４ｕｍ范围内实现了可调谐。     

LD泵浦Nd∶YVO_4/KTP/BBO紫外激光器

本文报道在国内首次实现的ＬＤ泵浦的四倍频连续紫外激光器的实验结果．首先研究了ＬＤ泵浦的Ｎｄ∶ＹＶＯ４激光器,在普通平－平腔结构下,得到斜效率５５．６８％,激光输出波长１０６４ｎｍ;利用ＫＴＰ作为倍频晶体,实现腔内倍频,在泵浦功率１１．８５Ｗ时得到绿光（５３２ｎｍ）输出１．３５Ｗ,光－光转换效率１１％;用ＢＢＯ晶体进行外腔谐振倍频,得到紫外光（２６６ｎｍ）输出     

激光二极管泵浦的准连续运转飞秒Cr:LiSAF激光器

报道国内第一台用６７０ｎｍ激光二极管泵浦的准连续锁模运转的Ｃｒ：ＬｉＳＡＦ激光器。对于连续运转,泵浦阈值功率２４０ｍＷ,当吸收功率为３６８ｍＷ的输出,输出波长８５０ｎｍ,斜效率为３．５％。在准连续运转（１００ＨＺ,占空比１／５时）,泵清阈值功率４５ｍＷ,斜效率为９．８％,用染料作为锁模妄动介质,实现了准连续锁模运转,光脉冲输出的中心波长为８５０ｎｍ。     

高效率低阈值Nd：S－FAP晶体激光特性

测量了新型晶体Ｎｄ：Ｓ－ＦＡＰ［Ｎｄ：Ｓｒ＿５（ＰＯ＿４）＿３Ｆ］的吸收光谱特性，它具有宽的有效吸收带，在５７５．０ｎｍ和８０５．４ｎｍ处有二个强的吸收峰．用可调谐染料激光器测量了５７５．０ｎｍ处的吸收系数为１９．７ｃｍ￣（－１），用波长为５７５．０ｎｍ的的染料激光作泵浦源，实现了１．０５９μｍ的全偏振光输出，最低闽值为２．５ｍＪ，斜效率为４９％。用ＫＴＰ倍频获得的绿光的波长为０．５２９５μｍ，峰值半宽度为１．０ｎｍ。     

可用于钕玻璃激光系统的自锁模飞秒激光器

描述了用激光二极管抽运的全固体Ｎｄ：ＬＭＡ自锁模飞秒激光振荡器,通过理论计算和分析,在其腔内加入－非线性系数较大的介质,同时对腔结构进行优化设计,实现了自锁模。它直接产生波长为１０５４ｎｍ的激光,输出激光脉冲的宽度达６１０ｆｓ,光谱宽度为２．１ｎｍ,输出功率达１５ｍＷ。     

铌酸钾锂晶全及其宽带二次谐波产生

报道了利用引上提拉法生长晨线性光学晶体铌酸钾锂,并且其实现了对准连续可调谐钛宝激光倍频。在波长为８９０－９５２ｎｍ范围内,通过室温下非监界相位匹配,得到４４５－４７６ｎｍ的二次谐波。抽运光强为１４４－２６９ｎＷ,二次谐波强度为０．５８－１．７３ｍＷ,倍频效率可达０．６５％。     

A Microchip Tunable Blue Laser Source Based upon Cr:LiSAF in Contact with KN Crystal

In this paper, a microchip laser consisted of 2.2% doped Cr:LiSAF crystal and NCPM KN(KNbO3) crystal and pumped by a 679 nm laser diode is reported. The maximal output of TEM00 4.76 mW of blue laser at 431.7 nm is obtained with the absorption power of 304.6 mW. The laser shows a threshold of 76.2 mW and slope efficiency of 2.08%. Continuous-wave tunable output is demonstrated in the blue region of 423.4～445.5 nm through only changing temperature of KN crystal controlled by PID controller.     

A Microchip Tunable Blue Laser Source Based upon Cr∶LiSAF in Contact with KN Crystal

In this paper, a microchip laser consisted of 2.2% doped Cr∶LiSAF crystal and NCPM KN(KNbO3) crystal and pumped by a 679 nm laser diode is reported. The maximal output of TEM00 4.76 mW of blue laser at 431.7 nm is obtained with the absorption power of 304.6 mW. The laser shows a threshold of 76.2 mW and slope efficiency of 2.08%. Continuous-wave tunable output is demonstrated in the blue region of 423.4～445.5 nm through only changing temperature of KN crystal controlled by PID controller.     

490-nm generation by sum-frequency mixing of diode pumped Nd:GdVO<Subscript>4</Subscript>-Nd:YLF lasers

We report a continuous-wave (CW) blue laser emission by sum-frequency mixing in Nd:GdVO₄ and Nd:YLF crystals. Using type-I critical phase-matching (CPM) LBO crystal, a blue laser at 490 nm is obtained by 1063 and 908 nm intracavity sum-frequency mixing. The maximum laser output power of 118 mW is obtained when an incident pump laser of 18.2 W is used. At the output power level of 118 mW, the output stability is better than 4.2%.     

Intracavity sum-frequency generation of CW blue light in Nd:LuVO<Subscript>4</Subscript> laser

We report for the first time a continuous-wave (CW) blue laser emission by sum-frequency mixing in Nd:LuVO₄ crystal. Using type-I critical phase-matching (CPM) LBO crystal, a blue laser at 493 nm is obtained by 1066 and 916 nm intracavity sum-frequency mixing. The maximum laser output power of 520 mW is obtained when an incident pump laser of 18.2 W is used. At the output power level of 520 mW, the output stability is better than 2.8%. The beam quality M ² value is are about 1.22 and 1.31 in both horizontal and vertical dimensions respectively.     

A Micro Blue-violet Laser by Frequency Doubling of Semiconductor Laser

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Diode-pumped Pr(3+):KY(3)F(10) red laser

We report the first observation to our knowledge of room-temperature continuous-wave laser operation of a Pr(3+):KY(3)F(10) single crystal at 644.5 nm, pumped by a blue GaN laser diode emitting at 446 nm. With a 2.5% transmission output coupler and a nonoptimized optical cavity, an output power of 39 mW was obtained at 644.5 nm with a laser threshold of 125 mW and a differential slope efficiency of 23%.     

494 nm blue laser based on sum-frequency mixing of diode pumped Nd<Superscript>3+</Superscript> lasers

We report for the first time a continuous-wave (CW) blue radiation at 494 nm by intracavity sumfrequency generation of 912 nm Nd:GdVO₄ laser and 1079 nm Nd:YAlO₃ (Nd:YAP) laser. Using type-I critical phase matching LiB₃O₅ (LBO) crystal, 494 nm blue laser was obtained by 912 and 1079 nm intra-cavity sum-frequency mixing, and output power of 179 mW was demonstrated. At the output power level of 179 mW, the output power stability is better than 3.5% and laser beam quality M ₂ factor is 1.21.     

Intracavity-frequency-doubling of a 946 nm Nd:YAG laser with cadmium mercury thiocyanate crystal

We report the intracavity-frequency-doubling of a 946 nm Nd:YAG laser with a CMTC crystal at room temperature. A cw output power of 1.64 mW of blue light at 473 nm is obtained. To our knowledge, this is the first time that CMTC crystal has been used to frequency double a 946 nm Nd:YAG laser.     

基于单块周期极化铌酸锂晶体级联三倍频的440 nm蓝光固体激光器

阐述了一种基于单块周期极化铌酸锂晶体级联三倍频实现440 nm蓝光输出的实验方案。根据周期极化铌酸锂晶体的Sellmeier方程以及倍频与和频的相位匹配条件,在一块周期极化铌酸锂晶体上设计了两段不同的极化周期,使其在同一工作温度下能分别实现倍频与和频,在先后经过倍频与和频后,实现级联三倍频输出。实验采用Nd: YAG产生的1319 nm光作为基频光,重频400 Hz,脉宽110 ns,横向和纵向光束质量因子分别为1.81和2.65。耦合进周期极化铌酸锂晶体后,出射光中检测到660 nm的红光和440 nm的蓝光。通过调整工作温度和入射基频光功率,得到2.4 mW的最大蓝光输出,此时工作温度55.5 ℃,基频光功率530 mW。实验结果验证了单块晶体实现级联三倍频440 nm蓝光输出的可行性。     

Efficient intracavity second-harmonic generation at 930 nm in a BiB<Subscript>3</Subscript>O<Subscript>6</Subscript> crystal

It is reported that efficient continuous-wave (CW) blue laser generation at 465 nm in a BiB₃O₆ (BiBO) crystal at type-I phase matching direction performed with a diode-pumped Nd³⁺:YAlO₃ (Nd:YAP) laser. With incident pump power of 18.4 W, output power of 823 mW at 465 nm has been obtained using a 10 mm-long BiBO crystal. At the output power level of 823 mW, the output stability is better than 2.3%.