Laser characteristics of Cr:Nd:GdCOB self-frequency-doubling crystal

The phase matching angle of GdCOB crystal is calculated. By using Xenon flash lamp as pump source, we have realized the free run from 1.06 μm to 0.53 μm in self-frequency-doubling Cr:Nd:GdCOB (bi-doped) crystal and Nd:GdCOB (uni-doped) crystal. The experimental results show that the threshold energies for bi-doped crystal and uni-doped crystal are 0.92 J and 1.00 J, respectively; when the pump energy is 10 J, the output energies of green laser for two kinds of crystals are 2.46 mJ and 1.96 mJ, respectively. The output energy of Cr:Nd:GdCOB crystal has an increase of 25% in comparison to that of Nd:Gd:COB crystal. In addition, we discuss ways to improve efficiency.     

染料激光抽运Nd:YCOB自倍频激光器

Ｎｄ：ＹＣａ４Ｏ（ＢＯ３）３（简称Ｎｄ：ＹＣＯＢ）是一种新型自倍频激光复合功能晶体,利用Ｄａｔａｃｈｒｏｍ－５０００型染料激光器作为抽运源,横向抽运钕离子原子比为８％的Ｎｄ：ＹＣＯＢ获得了５３０．２ｎｍ绿色自倍频激光输出。在样品未镀膜的情况下阈值抽运量小于２ｍＪ,绿光输出能量最大为１．０３ｍＪ,能量转换效率约为３．３％。     

New green self-frequency-doubling diode-pumped Nd:Ca4GdO(BO3)3 laser

3+ :Ca₄GdO(BO₃)₃ (Nd:GdCOB). 21 mW of green cw laser emission for an absorbed pump power of 820 mW were achieved under laser diode-pumping. 64 mW of green cw laser output were obtained with 1 W of absorbed pump power under titanium-sapphire pumping. Its availability in large-size crystals with good optical quality makes Nd:GdCOB a true challenger to the best SFD laser crystal reported so far: Nd:YAl₃(BO₃)₄ (Nd:YAB or NYAB). Received: 2 March 1998/Revised version: 20 May 1998     

用Cr4+:YAG晶体实现Nd3+:YAG 0.946 μm激光被动调Q运转

以Cr4+:YAG晶体作为可饱和吸收体,氙灯作为抽运源,实现了Nd3+:YAG晶体在0.946 μm波长处的调Q运转.激光脉冲宽度为38 ns,能量为1.7 mJ.     

A Highly Efficient SHG in CPM, Nd:YAG/LBO Laser

An energy conversion efficiency of 65.3% for second harmonic generation (SHG) from 1.06 μm to 0.53 μ m has been achieved by intracavity frequency doubling (IFD) in LiB 3O 5(LBO) crystal and a colliding pulse mode locked (CPM) Nd:YAG pulsed laser with a convex antiresonant ring (ARR) unstable resonator. For a fundamental wave with 20.2 mJ energy, 10 ps duration and a energy stability of 96.4%, a green output energy of 13.2 mJ was obtained. The energy conversion efficiency in IFD is much higher than that in extracavity frequency doubling (EFD) which is only 33.87%.     

受激布里渊散射相位共轭光泵浦的高效率光学参量振荡器

报道了在Ｎｄ：ＹＡＧ１．０６μｍ激光器上，用受激布里渊散射（ＳＢＳ）后向放大输出作泵浦光源，用光学参量振荡（ＯＰＯ）的方法，获得１．５７μｍ激光输出，最大输出能量为２１．６ｍＪ，相应的转换效率为３２％，并与直接用Ｎｄ：ＹＡＧ１．０６μｍ激光泵浦结果相比较，效率提高１．９倍，阈值降低１．７倍，实验结果与理论分析符合的较好。     

种子注入环形腔人眼安全KTP参变振荡器的研究

利用电光调Q的Nd:YAG激光器抽运非临界相位匹配(θ=90°,φ=0°)环形腔KTP光学参变振荡器(OPO),实现了高能量人眼安全波段的1.57μm激光输出。理论与实验结果表明,减小谐振腔长度和注入种子源激光可以有效降低阈值,提高输出能量。当Nd:YAG激光器抽运能量为88mJ时,注入种子源功率由0mW增加到6mW,输出能量由8.8mJ增加到14mJ。当抽运能量为167.7mJ,注入种子源功率达到6mW时,最大输出能量达到46mJ,峰值功率7.44MW。     

基于差频技术产生4μm波长光波混频系统的特性分析

介绍了一种基于差频技术产生4μm中红外激光输出的技术方案。将Nd：YAG激光器产生的1．06μm和1．44μm的激光直接注入LiNbO3晶体中进行差频，从而得到4μm的激光输出。导出了处理三波耦合的耦合波方程，并作了计算分析。结果表明，该方案在4．04μm波长处的激光输出可达40-50mJ。     

利用KTP晶体实现1.08μmNd：YAP激光器锁模

本文描述了利用ＫＴＰ晶体和腔的基波输出镜构成非线性镜实现１．０８μｍＮｄ：ＹＡＰ激光器的被动锁模。实验表明，这种新的锁模技术比用染料作可饱和吸收体的被动锁模技术有很多突出的优点，具有很大的发展潜力。实验测得锁模时基波１．０８μｍ输出２．４ｍＪ，二次谐波０．５４μｍ输出０．５ｍＪ（同样条件下的静态输出为２．５ｍＪ），基波脉冲的平均脉宽为４０ｐｓ。     

An investigation on laser-diode-array pumped Nd: glass slab laser

Ａｎｉｎｖｅｓｔｉｇａｔｉｏｎｏｎｌａｓｅｒ－ｄｉｏｄｅ－ａｒｒａｙｐｕｍｐｅｄＮｄ：ｇｌａｓｓｓｌａｂｌａｓｅｒ￥ＨＵＷｅｎｔａｏ；ＺＨＯＵＦｕｚｈｅｎｇ；ＣＨＥＮＹｏｕｍｉｎｇ；ＪＩＡＮＧＺｈｏｎｇｈｏｎｇ（ＳｈａｎｇｈａｉＩｎｓｔｉｔｕｔｅｏｆ...     

1064nm纳秒激光脉冲激发的外腔式PbWO4拉曼激光器

研究了外腔式PbWO4拉曼激光器在纳秒脉冲抽运下的输出特性。利用主动调Q的Nd:YAG激光器产生的脉冲宽度为31.4ns,最大输出能量为200mJ的1064nm激光作为抽运源。拉曼激光谐振腔采用的是平凹腔设计。测量了输出的拉曼光脉宽与抽运能量的关系,分析了输出的拉曼光脉冲波形图和光谱图,测量了输出的拉曼光脉冲能量与抽运能量的关系,计算了转换效率与抽运能量的关系。当注入抽运光能量达到42mJ时,得到了一阶斯托克斯光脉冲的最大能量和转换效率分别为10mJ和24%,获得外腔式PbWO4拉曼激光器的一阶斯托克斯光脉冲波长为1177.6nm,典型的一阶斯托克斯光脉冲脉宽为20ns。     

新型晶体Nd:S-VAP激光特性研究

测量了 Nd:S-VAP[Nd:Sr₅(VO₄)₃F]晶体的吸收光谱特性,在583.0nm 和809.0nm处有强烈的吸收峰.用可调谐染料激光泵浦实现了低阈值、高效率的激光运转.在透射率15%的平-平腔情况下,斜率效率为50%,阈值2mJ,倍频绿光的中心波长为536.0nm,线宽为1.4nm.采用φ4mm×30mm 的氙灯泵浦,实现了自由运转和染料片调 Q 运转.阈值为130mJ,斜效率为1.3%.测量了不同腔长、不同染料片小信号透射率情况下的输出能量、脉冲宽度以及光束发散角和偏振特性等.     

All-solid-state intracavity frequency-doubled Nd:Y<Subscript>0.36</Subscript>Gd<Subscript>0.64</Subscript>VO<Subscript>4</Subscript>-GdCa<Subscript>4</Subscript>O(BO<Subscript>3</Subscript>)<Subscript>3</Subscript> green laser under direct 880 nm pumping

We report a green laser at 532 nm generation by intracavity frequency doubling of a continuous wave (CW) laser operation of a 1064 nm Nd:Y_0.36Gd_0.64VO₄ laser under in-band diode pumping at 880 nm. An GdCa₄O(BO₃)₃ (GdCOB) crystal, cut for critical type I phase matching at room temperature is used for second harmonic generation of the laser. At an incident pump power of 17.8 W, as high as 2.92 W of CW output power at 532 nm is achieved. The optical-to-optical conversion efficiency is up to 16.4%, and the fluctuation of the green output power was better than 2.5% in the given 30 min.     

激光二极管列阵侧面泵浦Nd：YLF激光器

报道准连续６０Ｗ激光二极管列阵侧面泵浦Ｎｄ：ＹＬＦ固体激光器的研究结果，当器件的动转重复频率为３０Ｈｚ时，得到４．４ｍＪ的１．０４７μｍ激光输出，光－光转换效率达到１８．３％，斜率效率达２４．４％。声光和电光调Ｑ，得到能量为２．２ｍＪ，脉宽分别为５０ｎｓ和３０ｎｓ的脉冲输出。     

激光自倍频晶体研究和应用进展

激光自倍频晶体是一类同时具有激光和非线性效应的复合功能晶体。以激光自倍频晶体制作的全固态激光器具有体积小,调整方便,稳定性高等优点。自1970年代以来,以LiNbO3,YAl3(BO3)4倍频晶体为基质的激光自倍频晶体实现了自倍频激光运转。近年来,以RECa4O(BO3)3(RECOB)为基质的激光自倍频晶体受到重视和广泛研究。本文从对激光晶体、非线性光学晶体及激光自倍频晶体的基本要求出发,在综述激光自倍频晶体研究历史的基础上,讨论了激光自倍频晶体中的基波和倍频光,探讨了NYAB和Nd:GdCOB一类晶体中晶体长度,Nd3+浓度和效率之间的关系。理论估算表明,当浓度适当,晶体长度10mm时,这两类晶体的光–光转换效率可达30%以上。本文总结了NYAB系列晶体的研究历程及RECOB系列激光自倍频研究的思路及取得的成果。在最近10年中,利用山东大学生长的Yb:YAB晶体,获得1.1 W自倍频绿光,光光转换效率为10%;在RECOB体系中,比较了各种晶体的特点,选定Nd:GdCOB为主要研究对象,经过晶体掺钕浓度和长度关系,位相匹配方向、膜系及热工程等多方面研究,获得了1.36 W的545 nm绿光输出,光–光转换效率为17.1%;输出功率为1.03 W时,半小时功率波动不超过1%。这是目前为止,Nd3+离子激光自倍频晶体的最好结果。文章最后介绍了激光自倍频晶体的可能应用。通过理论和实验分析,认为到目前为止Nd:GdCOB是以Nd3+为激活离子最后的激光自倍频晶体,而在Yb3+为激活离子时,Yb:YAB晶体最佳。     

LD泵浦Nd：BGO晶体的自调Q激光器

首次实现了ＬＫ泵浦Ｎｄ∶ＢＧＯ固体激光器的１．０６４μｍ的激光输出，泵浦阈值功率为２５ｍＷ，在连续运转状态下得到最大为４０ｍＷ的ＴＥＭ００模输出，光－光效率为１３．３％，根据法拉第磁光效庆理论，了ＬＤ泵浦Ｎｄ∶ＢＧＯ自调Ｑ激光器的各种参数，并研制成该激光器，在该器件中，作为损耗调制元件的磁光调制器就是绕有线圈的Ｎｄ∶ＢＧＯ晶体本身，实验在重复率为１ＫＨｚ的条件下得到了ＦＷＨＭ为１００ｎｓ的稳定脉冲     

Xenon Flash Lamp Pumped Miniature Nd:S-VAP Pulsed Laser

ＸｅｎｏｎＦｌａｓｈＬａｍｐＰｕｍｐｅｄＭｉｎｉａｔｕｒｅＮｄ：Ｓ－ＶＡＰＰｕｌｓｅｄＬａｓｅｒＸｅｎｏｎＦｌａｓｈＬａｍｐＰｕｍｐｅｄＭｉｎｉａｔｕｒｅＮｄ：Ｓ－ＶＡＰＰｕｌｓｅｄＬａｓｅｒ￥ＺＨＡＯＳｈｅｎｇｚｈｉ；ＷＡＮＧＱｉｎｇｐｕ；ＺＨＡＮ...     

多波长半导体激光阵列端泵Nd:YAG脉冲激光器

研制了无温控多波长激光二极管阵列端面泵浦Nd：YAG电光调Q激光器。采用4 000 W多波长准连续激光二极管阵列作为泵浦源,快轴准直镜与透镜导管作为泵浦耦合系统,端面泵浦φ6 mm×60 mm的Nd：YAG晶体,并采用RTP晶体进行电光调Q实验。在重复频率5 Hz、室温（25℃）时,激光器获得了最大输出能量74.4 mJ、脉宽15 ns的1 064 nm脉冲激光输出,光光转换效率达到11%。在25~55℃的工作温度下,对多波长LDA的光谱特征与激光器的输出特性作了测试,激光器输出能量随着工作温度的上升而先迅速下降再逐步保持稳定,当重复频率分别为5 Hz和10 Hz时,激光器对应的最低输出能量分别为48 mJ与37 mJ。     

Study of passive Q-switching for flash-lamp-pumped 1.34-μm Nd:GdVO4 laser

The static laser performance of a-growth Nd:GdVO4 crystal (a-cut, 4 × 4 × 25 (mm)) at 1.34μm pumped by flash-lamp is investigated with different transmissions of output couplers. With the output coupler transmission of T = 30%, the static output energy of 148 mJ is obtained when the pump energy is 35.2 J,and the corresponding electric-optical conversion efficiency is 0.42%. The Q-switched output of lasers with the output wavelength ranging from 1.3 to 1.6 μm can be realized by using Co2+ :LaMgAl11O19 (Co:LMA)as saturable absorber. A flash-lamp-pumped, passively Q-switched Nd:GdVO4 laser with Co:LMA as saturable absorber is demonstrated in plano-concave laser cavity. With the cavity length of 16.3 cm and pump energy of 19.8 J, the single-pulse output energy, pulse width, and peak power are obtained to be 4m J, 80 ns, and 5 × 104 W, respectively.     

Nd：S—FAP晶体1.328μm激光特性研究

用染料激光和氙灯泵浦实现了ＮｄＳ－ＦＡＰ晶体低阈值、高效率的１．３２８μｍｍ激光运转。在透过率７％的平－平腔情况下，染料激光泵浦斜效率为３８％，阈值４．５ｍＪ，倍频红光波长为０．６６４μｍ，线宽１．３ｎｍ；采用氙灯泵浦（４×３０ｍｍ），实现了１．３２８μｍ自由运转，阈值为２４０ｍＪ，斜效率为０．８５％。测量了不同腔长，不同透过率情况的输出能量、光束发散角和偏振特性等。