采用飞秒光纤激光同步泵浦的自启动锁模钛宝石激光研究

针对常规连续激光泵浦钛宝石激光振荡器不能自启动锁模的缺点,采用倍频飞秒光纤激光同步泵浦,通过调节振荡器腔长与泵浦腔长匹配,实现了飞秒钛宝石激光的自启动锁模。实验中采用3.4 W的倍频掺镱光纤激光同步泵浦钛宝石激光振荡器,获得了平均功率大于130 mW、重复频率75 MHz、光谱宽度大于47 nm、脉冲宽度17 fs的锁模脉冲输出,不仅能够稳定可靠地实现自启动锁模,解决了常规钛宝石激光振荡器锁模启动的困难,而且还具有同步输出1040,800,520 nm三束飞秒激光的特点,为进一步开展飞秒激光相干合成以及光参量放大等研究提供了优势基础。     

宽带扩展腔产生15飞秒光脉冲实验研究

用３ｍｍ长的钛宝石短棒和改进的非对称Ｚ型折叠腔结构进行自锁模实验，以石英棱镜对作为腔内色散补偿元件，在５Ｗ氩离子激光泵浦下，实现低阈值泵浦自锁模运转。在腔内不加任何调制元件的情况下实现软光阑锁模，获得最短脉冲宽度为１５ｆｓ，光谱宽度为８０ｎｍ，输出平均功率４００ｍＷ。     

自锁模钛宝石激光器谐振腔的像差研究

论述自锁模钛宝石激光器谐振腔的像差补偿问题，分析了“Ｘ”型与“Ｚ”型谐振腔彗差的大小，由此对这两种腔作出比较，指出“Ｘ”型腔的优点，在这样设计的激光器上，获得了１９ｆｓ激光脉冲输出，功率为３２０ｍＷ，中心波长为７８４ｎｍ，全半宽度为４２ｎｍ。     

半导体激光泵浦预激光锁模调Q固体激光器研究

报道半导体激光侧面泵浦预激光锁模调Ｑ的Ｎｄ：ＹＡＧ固体板条激光器，预激光锁模调Ｑ的激光脉冲宽度为３６ｐｓ，调Ｑ包纤各心的锁模单脉冲能量超过７μＪ，相应的峰值功率达２００ｋＷ。     

自锁模Cr：LiSAF激光器的实验研究

以功率为９００ｍＷ，波长为４８８ｎｍ的单线氩离子激光作为泵浦源，在腔内不加任何主动调制器和可饱和吸收体的情况下实现了Ｃｒ：ＬｉＳＡＦ激光器的飞秒级自锁模运转，得到了脉冲宽度为４０ｆｓ，重复频率为１００ＭＨｚ，平均输出功率为４５ｍＷ的稳定的锁模脉冲序列。     

钛宝石激光抽运的被动锁模Tm:YAG陶瓷激光实验研究

本文采用连续钛宝石激光作抽运,掺杂浓度为6 at.%、长度为2.7 mm的Tm:YAG陶瓷作增益介质,通过引入半导体饱和吸收体获得了稳定的被动锁模运转.实验中获得的激光锁模功率为116.5 mW,中心波长为2007 nm,重复频率为109 MHz,通过自行搭建的腔外非共线强度自相关测量得到的脉冲宽度是55 ps.     

SESAM实现Nd:YAG激光器被动锁模研究及皮秒脉冲测量

分析了1.06 μm半导体可饱和吸收镜(SESAM)结构及被动锁模基本原理,利用SESAM实现了脉冲式Nd:YAG激光器1.06μm激光的被动锁模,获得了稳定的皮秒激光脉冲序列输出,脉冲序列的能量为45mJ.实验上还研究了腔长对SESAM锁模效果的影响.提出一种基于迈克耳逊干涉仪的皮秒光脉冲测量方法--二次谐波自相关单次测量法,分析这种测量方法的原理并构建实验装置对SESAM被动锁模Nd:YAG激光器的皮秒激光脉冲进行测量,测得激光脉冲宽度为43.6 ps.二次谐波单次测量法具有精度较高,操作简单等优点.     

非线性放大环形镜“8”字腔光纤激光器实验研究

使用976 nm半导体激光器作为抽运源,对利用非线性放大环形镜（NALM）锁模运行的掺Yb3+光纤激光器进行了实验研究,获得了脉冲宽度43.6 ps,中心波长为1053.3 nm的锁模脉冲激光输出, 光谱宽度8 nm, 输出功率为0.2 mW, 重复频率为18.2 MHz, 经过放大, 通过光栅对腔外色散补偿,在腔外产生了宽度616 fs的脉冲激光.     

基于啁啾光纤布拉格光栅的掺镱保偏锁模光纤激光研究

利用啁啾光纤布拉格光栅作为光谱滤波器和色散控制元件来控制掺镱保偏锁模光纤激光的光谱形状和腔内色散.实验装置采用线性腔设计,利用半导体饱和吸收镜作为锁模器件,实现掺镱保偏光纤激光器的被动锁模激光输出.当泵浦功率为52 mW时,获得了脉冲宽度为4.26ps,重复频率为15.7 MHz,平均功率为9.8mW的稳定锁模脉冲激光输出.输出激光中心波长为1 030nm,3dB谱宽为7.2nm,对应理想傅里叶变换极限脉宽约为150fs.     

一种连续Nd：YAG激光锁模的新技术

本文首次报道了在连续运转的Ｎｄ：ＹＡＧ激光器上通过移动腔镜实现锁模的实验研究。获得平均宽度为６０ｐｓ的锁模脉冲序列。文中提出了实验结果的初步解释，表明这种锁模现象是一种增强的自锁模。     

Nd:LMA自锁模飞秒激光器腔结构最佳化设计

Nd:LMA晶体相对低的非线性折射率n₂,使得针对Ti:Sapphire自锁模激光器设计的腔,对Nd:LMA介质而言并没有提供足够的自幅度调制(SAM).为了在Nd:LMA激光器上实现自锁模,在腔内引入一个具有大的非线性系数n₂、快的响应时间的SF57介质,这样就使得激光腔的结构比较特殊.在这篇文章里利用ABCD传输矩阵对该激光器的结构从理论上进行了分析和计算,使腔结构达到了最佳化设计.     

二极管泵浦克尔透镜锁模Nd:YLF激光器

本文报道利用非线性光学玻璃SF57实现了二极管泵浦Nd:YLF激光器自启动克尔透镜锁模.现有二极管(LD)泵浦的固体激光器大多采用在增益介质的端面镀双色膜作为腔的一个反射镜,我们采用了一个分立的双色镜作为腔的反射镜避免了一系列的热问题.比如:热透镜,热致双折射,热膨胀等.从而改善了激光系统的稳定性,得到1.047μm光脉冲时间半宽为1.5ps,光谱宽度为231GHz,时间带宽积0.347表明脉冲接近变换极限.     

Kerr-lens mode-locked polycrystalline Cr:ZnS femtosecond laser pumped by a monolithic Er:YAG laser

We demonstrated a Kerr-lens mode-locked polycrystalline Cr:ZnS laser pumped by a narrow-linewidth linearpolarised monolithic Er:YAG nonplanar ring oscillator operated at 1645 nm. With a 5-mm-thick sapphire plate for intracavity dispersion compensation, a compact and stable Kerr-lens mode-locking operation was realised. The oscillator delivered 125-fs pulses at 2347 nm with an average power of 80 m W. Owing to the special polycrystalline structure of the Cr:ZnS crystal, the second to fourth harmonic generation was observed by random quasi-phase-matching.     

4.5MW小型化全固态腔倒空飞秒掺钛蓝宝石激光器

研制了国内首台腔倒空克尔透镜自锁模掺钛蓝宝石激光器,该激光采用二极管抽运的全固态连续波532nm激光抽运.在5.4W的抽运功率下,获得了峰值功率大于4.5MW、脉宽小于18fs的稳定锁模脉冲,其重复频率可低至20kHz,所占尺寸约53.5cm×20.5cm.据知,此结果是迄今重复率最低、结构最紧凑的声光腔倒空飞秒激光器件 关键词： 掺钛蓝宝石 腔倒空 飞秒脉冲 克尔透镜锁模     

Diode-pumped 65 fs Kerr-lens mode-locked Yb(3+):Lu(2)O(3) and nondoped Y(2)O(3) combined ceramic laser

Diode-pumped Kerr-lens mode-locked laser operation of Yb(3+):Lu(2)O(3) and nondoped Y(2)O(3) combined ceramics has been achieved; 65 fs pulses with an average power of 320 mW under 5 W of pump power were obtained at the center wavelength of 1032 nm. The spectral bandwidth and the time bandwidth product were 18.9 and 0.345 nm, respectively. To our knowledge, this is the first demonstration of a Kerr-lens mode-locked laser operation based on Yb(3+):Lu(2)O(3) ceramic.     

Diode-pumped Kerr-lens mode-locked femtosecond Yb:YAG ceramic laser

We experimentally demonstrated a diode-pumped Kerr-lens mode-locked femtosecond laser based on an Yb:YAG ceramic. Stable laser pulses with 97-fs duration, 2.8-nJ pulse energy, and 320-mW average power were obtained. The femtosecond oscillator operated at a central wavelength of 1049 nm and a repetition rate of 115 MHz. To the best of our knowledge, this is the first demonstration of a Kerr-lens mode-locked operation in a diode-pumped Yb:YAG ceramic laser with sub-100 fs pulse duration.     

Tunable second harmonic generation from a Kerr-lens mode-locked Yb:YCa_4O(BO_3)_3 femtosecond laser

We experimentally demonstrated a diode-pumped Kerr-lens mode-locked femtosecond(fs) laser with a self-frequency doubling Yb:YCa_4O(BO_3)_3 crystal.Sub-40 fs laser pulses were directly generated from the oscillator without extracavity compression.The central wavelength was tunable from 1039 nm to 1049 nm with a typical bandwidth of 35 nm and an average output power of 53 mW.For the first time,a self-frequency doubled second harmonic green laser with tunable range from 519 nm to 525 nm was observed.     

Diode-pumped sub-100 fs Kerr-lens mode-locked Yb3+:Sc2O3 ceramic laser

Diode-pumped Kerr-lens mode-locked laser operations of Yb3+:Sc2O3 ceramics have been achieved. 92 fs pulses with the average power of 850 mW under 3.89 W incident pump power were obtained at a center wavelength of 1042 nm. The optical-to-optical efficiency was 21.9%. 90 fs pulses with the average power of 160 mW were also obtained at a center wavelength of 1092 nm. To our knowledge, this is the first demonstration of a Kerr-lens mode-locked Yb3+:Sc2O3 laser.     

Ultralow-threshold Kerr-lens mode-locked Ti:Al(2)O(3) laser

An ultralow-threshold Kerr-lens mode-locked Ti:Al(2)O(3) laser achieved by use of an extended cavity design is demonstrated. Mode-locking thresholds as low as 156 mW are achieved. Pulses with durations as short as 14 fs and bandwidths of >100 nm with output powers of ~15 mW at 50-MHz repetition rates are generated by only 200 mW of pump power. Reducing the pump power requirements to a factor of 10x less than required by most conventional Kerr-lens mode-locked lasers permits inexpensive, low-power pump lasers to be used. This will facilitate the development of low-cost, high-performance femtosecond Ti:Al(2)O(3) laser technology.     

同步泵浦PML飞秒激光研究

采用CW锁模YAG倍频激光器同步泵浦PML飞秒染料激光器,产生了平均脉宽约55fs、功率为15mW的光脉冲。文章在理论和实验上还研究了同步泵浦飞秒激光脉冲产生技术。