激光二极管抽运的Nd∶YVO4 GaAs被动调Q激光器研究

报道了激光二极管端面抽运Nd∶YVO4 半导体材料GaAs被动调Q激光器运转。测量了不同透过率输出镜条件下 ,输出调Q脉冲的宽度、能量及脉冲重复率。在抽运功率为 4W时 ,得到了脉宽为 30ns、能量为 8μJ、重复率为6 0kHz的稳定的调Q脉冲。还就GaAs调Q机理进行了理论研究并对实验中的一些现象进行了分析讨论     

半导体可饱和吸收镜被动锁模侧面抽运Nd:YAG激光器研究

利用半导体可饱和吸收镜(SESAM)锁模技术实现的超快脉冲激光器具有结构简单紧凑、脉冲序列稳定等优势,在许多领域有着重要用途,自问世以来受到国内外的广泛关注.分析了SESAM被动锁模侧面抽运固体激光器的具体要求,进行了不同条件下的SESAM被动锁模侧面抽运Nd:YAG激光器实验.获得了最高平均功率9.5 W,脉冲重复频率71 MHz,单脉冲能量约141 nJ的皮秒激光脉冲.对SESAM被动锁模侧面抽运Nd:YAG激光器进行了实验和理论分析,对实现高功率连续超短脉冲激光器进行了探讨.     

High Power Continuous-Wave Actively Mode-Locked Diode-Pumped Nd:YAG Laser

We demonstrate a diode-pumped cw mode-locked Nd：YAG by an acousto-optic mode locker. A mode-locked pulse with duration of 345 ps and output power of 12 W is obtained. The resonator design shows three advantages： a larger mode volume, high stability against thermal lens fluctuations, and excellent beam quality with TE00 mode. Different from previous active mode locking designs, we employ a frequency stabilizer and a phase-lock loop circuit to ensure the mode locking stable operation.     

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。     

A Bidirectional, Diode-Pumped, Passively Mode-Locked Nd：YVO4 Ring Laser with a Low-Temperature-Grown Semiconductor Saturable Absorber Mirror

We report the operation of a bidirectional picosecond pulsed ring Nd：YVO4 laser based on a low-temperaturegrown semiconductor saturable absorber mirror. Except for the laser crystal, the six-mirror ring laser cavity has no intra-cavity elements such as focusing lens or mirror. The bidirectional mode locked pluses are obtained at the repetition rate of 117.5 MHz, pulse duration of 81 ps, power of 2 × 200 mW.     

Diode-Pumped Passively Q-switched Single-Frequency Nd:YAG Lasers

Laser-diode pumped passively Q-switched single-frequency Nd:YAG laser has been demonstrated with a Cr⁴⁺:YAG crystal as the saturable absorber. When pumped with a fiber-coupled CW laser diode, the laser produces pulses of 1.4-20.9 ns duration, with a repetition rate of 1.9-52.0 kHz. The highest peak power of 17.6 kW was obtained at an incident pump power of 1.8 W. The use of a Cr⁴⁺:YAG saturable absorber enables the laser to operate not only in a single-frequency mode but also linearly polarized. The mode selection mechanism is discussed.     

连续激光二极管泵浦Nd：YVO4激光器的腔内倍频

报道连续激光二极管泵浦的Ｎｄ：ＹＶＯ４激光器的腔内倍频实验结果，比较了不同掺杂浓度的Ｎｄ：ＹＶＯ４晶体的倍频输出功率，最大绿光输出功率为２２．２ｍＷ，光－光转换效率为３．５％，此外，还研究了腔内倍频的输出涨落特性。     

Passively Mode-Locked Femtosecond Disordered Crystal Laser with Nd:CGA as Gain Medium

We present a laser-diode-pumped passively mode-locked femtosecond disordered crystal laser by using Nd:CaGdAIO_4(Nd:CGA) as the gain medium.With a pair of SF6 prisms to control the dispersion compensation,laser pulses as siort as 850 fs at 1079 nm are obtained with a repetition rate of 124.6MHz.The measured threshold pump power is 1.45 W.A maximum average output power of 122 mW is obtained under the pump power of 5.9 W.These results show that Nd:CGA could be a promising laser medium for generating femtosecond ultrashort pulse at about 1 μm.     

Raman-Assisted Passively Mode-Locked Fiber Laser

We propose and demonstrate a Raman-assisted passively mode-locked Yb-doped fiber laser in a normal dispersion regime. A section of highly nonlinear fiber is adopted to enhance the nonlinearity to extend the bandwidth of the gain spectrum by the stimulated Raman effect. The mode-locked fiber laser emits a broad spectral bandwidth of 64 nm at the-20 dB level and a highly stable pulse operation with a signal-to-noise ratio of 77 dB.     

角锥棱镜腔激光二极管抽运被动调Q激光器

为了提高传导冷却条件下激光二极管(LD)侧向抽运被动调Q激光器的光束质量和输出稳定性,采用了两组半圆柱面激光二极管阵列侧向交错抽运两根串接的激光棒,实现了均匀抽运和散热。通过实验分析了横模结构对被动调Q稳定性的影响,设计了角锥棱镜-高斯输出镜非稳腔,在显著提高器件光束质量的同时,明显改善了被动调Q的稳定性,并保证了谐振腔的机械稳定性。在此基础上研制了一台重复频率20 Hz、单脉冲能量64 mJ、脉冲宽度7 ns、稳定性优于±5%、光束发散角0.6 mrad、光-光效率9.1%,且光轴指向稳定的工程实用器件。     

被动调Q自拉曼Nd:GdVO4激光器

对激光二极管(LD)抽运的自拉曼Nd:GdVO4被动调Q激光器进行了详细的理论和实验研究.实验中采用Nd:GdVO4晶体同时作为激光介质和拉曼晶体,分别用了两块不同初始透射率的Cr4 :YAG晶体,得到并比较了采用不同初始透射率的Cr4 :YAG晶体时被动调Q自拉曼激光器的性能.测量了平均输出功率、脉冲宽度和脉冲重复率随抽运功率的变化关系.当Cr4 :YAG的初始透射率为0.91,输入功率是5.7 W时,得到的拉曼光的最高功率为244.6 mW,相应的转换效率为4.3%.通过数值求解基频光和拉曼光空间分布的速率方程并应用到被动调Q自拉曼Nd:GdYO4激光器.获得的理论结果与实验结果大致相符.     

Diode-Pumped Monolithic Nd:LMA Laser

Ｄｉｏｄｅ－ＰｕｍｐｅｄＭｏｎｏｌｉｔｈｉｃＮｄ：ＬＭＡＬａｓｅｒ￥ＬＵＪｉａｎｇ；ＨＵＡＮＧＺｈａｏｍｉｎｇ；ＪＩＮＺｈｅｎｈｏｎｇ；ＷＡＮＧＹａｎｇｊｕｎ（ＯｐｔｉｃａｌＦｉｂｅｒＩｎｓｔｉｔｕｔｅ，，ＳｈａｎｇｈａｉＵｎｉｖｅｒｓｉｔｙｏｆＳｃ...     

Generation of 170-fs Laser Pulses at 1053nm by a Passively Mode-Locked Yb:YAG Laser

A novel method is developed to obtain 1.05μm laser operation with a Yb：YAG laser. By using a Yb：YAG crystal with proper length and doping concentration, a femtosecond Yb： YAG laser is realized at the central wavelength of 1053nm. The measured pulse duration and spectral bandwidth （FWHM） are 170fs and 7nm; the repetition rate is 80 MHz. Under a power pump of 2 W, an average mode-locking power of 180mW is achieved.     

二极管激光泵浦Nd：YVO4激光器的频率调谐特性研究

用加热法和压电陶瓷ＰＺＴ调腔的方法，实现二极管激光泵浦的单频运转１０６４ｎｍ２％Ｎｄ：ＹＶＯ４激光器调谐。调谐范围４７．４ＧＨｚ，增益峰漂移引起的激光频率温度系数２ｖ／２Ｔ＝－１．０４ＧＨｚ／℃，压电陶瓷调谐系数１５０ＭＨｚ／Ｖ。研究了加热影响件性能的情况。     

LD抽运Nd∶YVO4自喇曼倍频黄光激光器

报道了LD抽运的自喇曼c切Nd∶YVO4调Q腔内倍频黄光激光器.Nd∶YVO4晶体同时作为激光介质和喇曼晶体，通过声光调Q技术，产生了1 178.7 nm的喇曼激光，经过KTP腔内倍频，输出589.4 nm黄光.测量了平均输出功率随抽运功率和脉冲重复率的变化.典型的1 066.7 nm基频光、1 178.7 nm喇曼光和589.4 nm倍频光的脉冲宽度分别为24.9 ns、11.2 ns和6.8 ns.在脉冲重复率为15 kHz，抽运功率为7.56W时，产生了平均功率为151 mW的589.4 nm光的输出.     

激光二极管抽运的GaAs被动Q开关Nd：YVO4激光器

利用固体可饱和吸收体砷化镓（GaAs）作为被动调Q元件，实现了激光二极管抽运平－凹腔掺钕钒酸钇（Nd:YVO4）激光调Q运转，详细测量了砷化镓被动调QNd:YVO4激光输出特性，获得脉宽15ns，重复频率470kHz，光束质量M^2=1.31的激光输出，调Q激光运转阈值为500mW，并数值求解了砷化镓被动调Q速率方程，讨论了被动调Q机理以及调Q脉冲宽度和脉冲重复频率对抽运速率的依赖关系，理论计算结果与实验结果相一致。     

被动调Q自拉曼Nd∶GdVO4激光器

对激光二极管(LD)抽运的自拉曼Nd∶GdVO4被动调Q激光器进行了详细的理论和实验研究。实验中采用Nd∶GdVO4晶体同时作为激光介质和拉曼晶体,分别用了两块不同初始透射率的Cr4 ∶YAG晶体,得到并比较了采用不同初始透射率的Cr4 ∶YAG晶体时被动调Q自拉曼激光器的性能。测量了平均输出功率、脉冲宽度和脉冲重复率随抽运功率的变化关系。当Cr4 ∶YAG的初始透射率为0.91,输入功率是5.7 W时,得到的拉曼光的最高功率为244.6 mW,相应的转换效率为4.3%。通过数值求解基频光和拉曼光空间分布的速率方程并应用到被动调Q自拉曼Nd∶GdVO4激光器。获得的理论结果与实验结果大致相符。     

Passively Mode-Locked Quasi-Three-Level Nd:LuVO4Laser with Semiconductor Saturable Absorber Mirror

We demonstrate a passively a Z-folded resonator. Using device, we achieve stable cw average output power under cw mode-locked Nd：LuVO4 laser operating on the quasi-three-level at 916nm with a semiconductor saturable absorber mirror （SESAM） as the passive mode-locking mode locking with 6.7ps pulse duration at repetition rate of 133 MHz and 88mW the pump power of 17.1 W.     

激光二极管抽运的GaAs被动Q开关Nd∶YVO4激光器

利用固体可饱和吸收体砷化镓 (GaAs)作为被动调Q元件 ,实现了激光二极管抽运平凹腔掺钕钒酸钇(Nd∶YVO4)激光调Q运转 ,详细测量了砷化镓被动调QNd∶YVO4激光输出特性 ,获得脉宽 15ns,重复频率 4 70kHz,光束质量M2 =1.31的激光输出 ,调Q激光运转阈值为 5 0 0mW ,并数值求解了砷化镓被动调Q速率方程 ,讨论了被动调Q机理以及调Q脉冲宽度和脉冲重复频率对抽运速率的依赖关系 ,理论计算结果与实验结果相一致。