Continuous wave, Q-switched and mode-locked operation of alaser-pumped Nd:LNA laser

A linear cavity Nd:LNA laser pumped by a Ti:sapphire laser was investigated in a continuous wave (CW), Q-switched and mode-locked regime. A parallel study using a Nd:YAG crystal was also conducted using the same optics and intercavity elements. The slope efficiencies obtained with a 5% output coupler in CW operation are 41 and 55% for Nd:LNA (λ~1.054 nm) and Nd:YAG (λ~1.065 nm), respectively. Mode locking was achieved with a 360-MHz intracavity phase modulator and led to a relative improvement of the Nd:LNA versus the Nd:YAG device. In the Q-switched mode with an intracavity acoustooptic modulator, the performance of the two lasers is almost identical. With 300 mW of absorbed pump power at λ~800 nm, peak powers ~130 W were achieved in a 65-ns pulse with a 5% output coupler     

LD抽运的Nd:YAG单频倍频激光器

在20mm激光腔内,Nd:YAG一端切成布氏角,与倍频晶体KTP组合构成双折射滤波片选择单纵模.用国产激光二极管(LD)纵向抽运,在会聚抽运光功率为500mW时,获得4mW单频连续运转的532nm绿光输出,同时获得约50mW的单频连续1064nm红外输出.     

Efficient, scalable, internally folded Nd:YAG laser end-pumped bylaser diodes

A scalable diode-pumped Nd:YAG laser is described in which the gain element resembles a penta-prism. This design allows longitudinal pumping along five separate axes. Using five high-power single stripe laser diodes, 4.16 W of absorbed power produced 2.3 W CW at 1.06 μm. The slope efficiency was 56%, the output was plane polarized, and the laser operated in the TEM₀₀ mode. The threshold power, was 48 mW. No evidence of thermal saturation was observed up to the maximum pump power. With an intracavity KTP crystal, 431 mW of CW amplitude-stable output at 532 nm was generated. Repetitive Q-switched operation is also reported     

二极管泵浦Nd:YAG/LBO连续波蓝光激光器

报道了一种半导体二极管(LD)泵浦Nd：YAG晶体，LBO腔内倍频实现了稳定的连续波473hm蓝光激光器，采用简单、结构紧凑的平凹腔设计，当注入功率为17W时，单向获得了234mW的单模蓝光输出。     

LD泵浦的Nd∶YAG腔内倍频激光器及其模式

用KTP晶体研制成LD泵浦的YAG腔内倍频激光器,得到0.532μm连续绿色线偏振激光输出,阈值泵浦功率为41mW,输出功率为1.4mW,斜效率为1.7％。研究了泵浦光对倍频激光横模的影响。     

激光二极管抽运的Nd:NYW/LBO绿光激光器

报道了用激光二极管(LD)抽运的掺钕钨酸钇钠[Nd3 :NaY(WO4)2](简称Nd:NYW)绿光激光器。腔内采用Ⅰ类临界相位匹配LBO(LiB3O5)作为倍频晶体,阈值抽运功率为410mW,在抽运功率为1.5W时获得了87mW的530nm连续激光输出,基频光-光转换效率大于25%,斜率效率为7.98%。     

全固态复合内腔和频613nm连续波橙光激光器

报道了全固态连续波613nm橙光激光器,橙激光是分别由Nd:YAG和Nd:YVO4晶体的1444nm和1064nm谱线非线性和频产生的,两条谱线在各自晶体对应能级跃迁分别为4F3/2-4I13/2和4F3/2-4I11/2.实验中采用复合腔结构,利用KTP晶体Ⅱ类临界相位进行内腔和频,当注入到Nd:YAG和Nd:YVO4晶体的泵浦功率分别为20W和10W时,获得344mW的TEM00连续波613nm橙激光输出.4h功率稳定度优于±2.8%.     

激光二极管端面泵浦的多晶Nd:YAG 1.32μm连续激光器

本文报道了激光二极管端面泵浦的多晶Nd：YAG(Polycrystalline Nd:YAG ceramic)1．32μm连续激光器的实验研究．在泵浦功率为2．1W时，激光达到阈值开始输出；在泵浦功率为9W时，输出功率达到690mW，斜率效率为11％．据我们所知，这是目前报道的功率最大的多晶Nd：YAGl．32μm连续激光器。     

激光二极管抽运复合腔和频连续波589 nm激光器

报道了一种利用复合腔进行腔内和频的589nm激光器.激光器由两个子谐振腔组成.在两个子谐振腔中,分别利用两个激光二极管(LD)抽运Nd∶YAG晶体和Nd∶YVO4晶体,并分别选择1319 nm波长(对应Nd∶YAG晶体的4F3/2→4I13/2跃迁)与1064 nm波长(对应Nd∶YVO4晶体的4F3/2→4I11/2跃迁)振荡进行和频.通过谐振腔的优化设计,实现了腔内两个波长较好的模式与增益匹配.在两个子腔的交叠部分,利用BiB3O6(BIBO)晶体Ⅰ类临界相位匹配进行腔内和频,得到和频激光输出.当Nd∶YAG与Nd∶YVO4晶体上抽运功率分别为750 mW和600 mW时,获得了24 mW,589 nm黄橙激光输出.该输出激光光束质量好、噪声低.     

LD泵浦Nd:YAG人眼安全波段1.44μm激光器

利用808 nm LD作泵浦源,通过合理的谐振腔镜膜层设计,实现了Nd:YAG的4Fa/2→4I13/2能级跃迁,获得了1.44 μm人眼安全波段激光的连续和脉冲运转.在泵浦功率为1.5 W的条件下,激光器连续运转时,腔内放入布氏片,获得268 mW的稳定TEM00模线偏振激光输出,激光阈值380 mW,斜效率达23.9%,M2因子小于1.3.用新型饱和吸收体V:YAG代替布氏片垂直于光路放置,获得了平均输出功率36 mW,脉冲宽度106 ns,脉冲重复频率52 kHz仍然是线偏振的激光输出,相应脉冲峰值功率和单脉冲能量分别为6.5 W和0.69μJ.     

LD抽运被动调Q Nd:YAG/GdV04内腔式喇曼激光器

为了研究LD抽运的被动调Q Nd:YAG/GdVO4内腔式喇曼激光器的输出特性,采用Nd:YAG作为激光介质,GdV04晶体作为喇曼介质,分别用两块不同初始透过率的Cr<'4+>:YAG晶体,得到并比较了采用不同初始透过率的Cr<'4+>:YAG晶体时被动调Q喇曼激光器的性能.测量了平均输出功率、脉冲宽度和脉冲重复率随...     

全固体化Nd：YVO_4单频绿光激光器

采用“面对面”激光二极管泵浦Ｎｄ：ＹＶＯ４和ＫＴＰ内腔倍频，获得单横模单纵横绿光输出。阈值泵浦功率为１２ｍｗ，实测的单端绿光最大单横模输出为７．３ｍｗ，最大单纵模输出为１．５ｍｗ，光光转换效率为１．９％。全固化系统设计小型紧凑，运转可靠。     

全固态Cr:LiSAF/LBO腔内倍频蓝光激光器

本文报道了利用最大输出功率为650mW的全固态Nd:YVO4/LB0671nm红光激光器作为泵浦源,纵向泵浦Cr:LiSAF,利用LBO腔内倍频,获得430nm的连续蓝光输出的实验研究,并解释了当泵浦功率继续增大时,输出功率下降的原因。在泵浦功率为560mW时,获得了最大输出功率为9mW的430nm蓝光输出,激光的阈值为230mW。     

Cr~(4+)∶YAG被动调QNd∶YAG陶瓷激光器的研究

介绍了近几年迅速发展的一种新型激光介质———透明Nd∶YAG多晶陶瓷的发展状况,对比分析了多晶陶瓷与单晶的光谱特性、激光特性和连续实验研究情况。并对钛宝石激光器调谐至808 nm,端面抽运Nd∶YAG陶瓷被动调Q全固态激光器的脉冲运转进行了较为详细的理论分析和实验研究。采用初始透射率为90%的Cr4+∶YAG可饱和吸收晶体,被动调Q的阈值功率为119 mW,当端面抽运功率为465 mW时,获得波长为1064 nm,脉宽为16ns,重复频率为18.18 kHz,单脉冲能量为3.4μJ,平均输出功率为61 mW的稳定调Q激光输出。采用不同初始透射率的Cr4+∶YAG晶体进行了实验和对比分析。     

850mW全固态腔内和频554．9nm连续黄光激光器

报道了全固态连续波554．9nm黄光激光器,黄激光是分别由Nd：YAG和Nd：YVO4晶体的1342nm和946nm谱线非线性和频产生,两条谱线在各自晶体对应能级跃迁分别为^4F3/2-^4I11／2和^4F3／2-^4I9/2。实验中采用复合折叠腔结构,利用LBO晶体I类临界相位进行内腔和频,当注入到Nd：YAG和Nd：YVO4晶体的泵浦功率分别为20W和8W时,获得850mW的TEMoo连续波554．9nm黄激光输出。4小时功率稳定度优于±2．5%.     

Generation of blue light at 469 nm by efficient frequency doublingof diode-pumped Nd:YAG laser

Efficient operation of a diode-pumped Nd:YAG laser at 938.5 nm is reported. A continuous wave output power of 3.9 W is obtained. Single-pass frequency doubling in periodically poled KTiOPO₄ (KTP) delivered a power of 88 mW at 469 nm. By intracavity frequency doubling an output of 200 mW in the blue region is achieved     

Dual-wavelength coupled-cavity Ti:sapphire laser with active mirrorfor enhanced red operation and efficient intracavity sum frequencygeneration at 459 nm

Sum frequency generation at 459 nm is demonstrated in a dual-wavelength coupled-cavity Ti:sapphire laser operating simultaneously at 808 nm and 1.06 μm. Enhanced operation of the Ti:sapphire laser at 1.06 μm is provided by a diode-pumped Nd:YAG active mirror. Comparable intracavity power is produced at both wavelengths, and 109 mW at 459 nm was generated with an intracavity KTP crystal. The 459-nm linewidth is 1 pm, and the conversion efficiency is 16%     

Mode-locked operation of a Nd:YLF laser and amplification in aQ-switched Nd:glass slab laser

A Nd:YLF laser pumped with a CW dye laser and acoustooptically mode locked at 38 MHz has an output power of 130 mW and a pulse length of 60 ps. Insertion of intracavity etalons and misaligning the mode locker allows for stable operation with a continuous range of pulse lengths from 60 ps to 4 ns. The 1.053-μm emission permits amplification of these pulses in a Q-switched Nd:phosphate glass slab laser oscillator up to intensities limited by optical damage     

Cr:YAG被动调Q全固态473 nm蓝光激光器

报道了LD抽运，Cr:YAG被动调Q，Nd:YAG/LBO结构的473 nm全固态蓝光激光器。在注入抽运功率为1600 mW时，得到平均功率9.1mW，脉冲宽度14.5 ns，重复频率4.19 kHz，峰值功率近150 W的被动调Q蓝光脉冲输出。     

Tunable laser-diode-pumped Nd:YAG microcrystal lasers at 1.4 μm

TEM₀₀ laser operation of a monolithic Nd:YAG crystal laser has been achieved on three transitions at 1.414 μm, 1.444 μm and at 1.431 μm with laser diode pumping at 808 nm. The laser threshold was 1.5 W and the maximum output power 50 mW. The gain linewidths at 1.414 μm and 1.444 μm were determined by means of temperature tuning the microcrystal lasers. Calculations for designing tunable single frequency microcrystal lasers have been performed