飞秒光脉冲的产生,放大和压缩

评述了飞秒光脉冲研究的现状，其包括同步泵浦连续染料激光器、对碰锁模环形染料激光器、飞秒光脉冲的多级放大和超短光脉冲的压缩．     

YAG激光同步泵浦染料激光器产生38fs光脉冲

研究表明,不用碰撞脉冲锁模技术,而由一台简单的线型腔染料激光器,就可成功地产生短达38飞秒的光脉冲。这种激光器用六镜折叠腔,其中有Rh6G和DOPCI两个喷流和一个棱镜对色散补偿器,用连续锁模Nd:YAG激光器的倍频输出同步泵浦。染料激光脉冲的平均功率为20mW,脉冲重复频率近100MHz。     

多波长钛宝石飞秒激光技术研究

报道了一种新的交叉锁模多波长钛宝石飞秒激光器的设计原理。该激光器能够同步产生两列或三列飞秒光脉冲。持续期短到２５ｆｓ的双波长脉冲调谐在７５５－８４８ｎｍ之间,同步精度约１０ｆｓ。     

GHz重复频率亚百飞秒克尔透镜锁模Yb:CaYAlO4激光器

GHz重复频率飞秒激光具有高单纵模功率和高采样速率等优点,在科学前沿和工业加工等领域具有重要的应用价值.受限于锁模原理和泵浦源的可用功率, GHz重复频率克尔透镜锁模激光器的平均输出功率通常仅为数十到百毫瓦量级,限制了其直接应用.基于此,本文报道了利用高功率单模光纤激光器泵浦的GHz重复频率高功率克尔透镜锁模飞秒激光器.通过合理的腔模设计,构建了四镜环形腔结构,使晶体中激光模式可以和整形后的泵浦光形成良好匹配,以利于软孔克尔透镜锁模的实现.在8 W的泵浦功率下,首次在Yb:CaYAlO₄激光器中实现了GHz重复频率的亚百飞秒高功率锁模运转,平均输出功率为2.1 W,重复频率为1.8 GHz,脉冲宽度为88 fs,对应峰值功率大于10 kW.该实验结果表明Yb:CaYAlO₄晶体具有产生GHz重复频率高功率飞秒激光的潜力,高功率短脉宽GHz飞秒激光器可为光学频率梳和微加工等领域提供优质光源.     

飞秒被动锁模光纤激光器的稳定性研究

从广义非线性薛定谔锁模方程出发，运用数值方法分别研究了泵浦光功率和非线性饱和吸收体对飞秒被动锁模光纤激光器工作特性的影响，并得到了激光器在基阶脉冲重复频率下稳态输出的最高输入泵浦功率和其对应的非线性饱和吸收体稳定工作区间。该研究结果为进一步优化设计最高泵浦功率、非线性饱和吸收体开关以及提高被动锁模光纤激光器的稳定工作性能都具有指导意义。     

用腔倒空Nd：YAG激光器对fs超短脉冲的同步放大

实现了用腔倒空Nd:YGA激光器对fs超短脉冲放大器的同步泵浦。由碰撞锁模环形染料激光器产生的80fs脉冲经二级染料放大后,实现放大倍数6.2×10~4,输出超短脉冲峰值功率～2×10~7W。     

同步泵浦染料激光中的频率啁啾计算

利用光场的自洽模型，将同步泵浦染料激光器的输出光脉冲的频率啁啾β作为光波场的位相参数，推导出适合于同步泵浦染料激光器的锁模方程．由此方程出发，求出输出光脉冲频率啁啾β的解析表达式，为实验上减小脉冲的频率啁啾，获得符合变换极限的短脉冲提供依据．     

19飞秒激光脉冲的产生与测量

本文介绍产生19飞秒激光脉冲的被动锁模四棱镜补偿群速度分散的环型染料激光器的特点;讨论了二次谐波强度自相关法和二次谐波干涉自相关法。用该激光器产生的超短而高稳定的光源对同步扫描条纹相管作了评价。     

应用于量子通信中的1．55μm波段光孤子脉冲源的研制

在连续变量的量子通信中，光孤子压缩纠缠态是一种重要的传输载体，大功率飞秒脉冲的产生是整个工作的基础。本文介绍了作为光孤子源的Cr^4＋：YAG飞秒脉冲激光器的研制。我们采用Z形折迭腔，通过光学ABCD矩阵分析法，得出了谐振腔稳定工作的最优化光路参数。应用1．06μm波段的Nd：YAG激光器作为泵浦源，以布儒斯特角切割的Cr^4＋：YAG晶体作为激光工作物质，以半导体可饱和吸收镜（SBR）作为锁模元件，     

同步泵浦-被动锁模染料激光器的基本方程及其解

利用自洽模型,推导出同步泵浦-被动锁模染料激光器的基本方程,并求出该系统输出的光脉冲宽度的解析表达式。由此,对这类混合锁模激光器系统的特性作了理论解析。 关键词：     

基于石墨烯的1 064 nm连续锁模超短脉冲激光器

介绍了利用沉积在增透镜上的石墨烯薄膜作为可饱和吸收体、808 nm激光二极管端面泵浦Nd∶YVO4晶体的1 064 nm连续锁模激光输出特性。采用W型折叠谐振腔结构,在808 nm泵浦功率为8.0 W时,有稳定的连续锁模脉冲输出,平均输出功率达到185 mW;当抽运功率增加到16.0 W时,获得了中心波长1 063.4 nm、脉冲宽度为518 fs、重复频率为66.7 MHz、最大平均输出功率为323 mW的百飞秒量级超短脉冲激光输出。实验结果表明:石墨烯具有优良的可饱和吸收性,在1 064 nm波段能够实现高功率、百飞秒量级连续锁模脉冲激光输出。     

Diode-laser pumped high-power and actively mode-locked Nd:YLF laser with fast switching

In an actively mode-locked laser, self-phase modulation can make pulse shorter at the expanse of causing instability at high pumping power. Using fast switching on the acousto-optic modulator, we can generate an actively mode-locked pulse train with shorter pulse width and higher average power than that driven by a sinusoidal signal. A 9-ps pulse train was generated in a mode-locked laser with an average power of 600 mW whose power level, to our knowledge, is the highest for diode-pumped and mode-locked Nd:YLF lasers.     

Dual picosecond dye lasers synchronously pumped by a mode locked cw yag laser

The performance of a novel dual dye laser system synchronously pumped by the frequency doubled output of a mode-locked CW-YAG laser is evaluated in relation to pulsewidth, pulse substructure, pulse spectral width and timing jitter. The behavior of the system is adequately described by a theoretical model which includes the time dependent gain and losses due to frequency bandwidth, cavity length mismatch and output coupler. The jitter is significantly reduced from that obtained with CW gas laser pumping as a result of the shorter pump pulse (50 ns instead of ≈100 ps). A routine operating condition uses 2-plate birefringen filters, 0.8 W pump power at 532 nm, to yield two 2.0 ps pulses having a cross correlation width of 3.8 ps, and 30 mW average power from each laser.     

Dual-wavelength synchronously mode-locked Nd:CNGG laser

We have experimentally demonstrated a dual-wavelength synchronously mode-locked Nd:CNGG laser based on the semiconductor saturable absorber mirror technique. Mode locking was achieved simultaneously on two gain bands of the crystal that have a central wavelength separation of 2.4 nm. The fundamental mode-locked pulse train has a repetition rate of 88 MHz and pulse duration of 5 ps, with an average output power of approximately 90 mW. Autocorrelation measurements show that each of the synchronously mode-locked pulses consists of a train of quasi-periodic beat pulses with a 660 fs pulse width and a 0.63 THz repetition rate.     

Nd:YVO4自受激拉曼激光器调Q锁模特性

利用Nd:YVO4激光晶体的自受激拉曼效应,结合Cr:YAG被动锁模技术和倍频技术,实现了结构紧凑的1176 nm和588 nm黄光锁模激光输出。激光器为LD端面泵浦,三镜折叠腔结构,并且采用了透过率为10%的输出镜。Nd:YVO4晶体长度为10 mm,Nd3+离子掺杂质量分数为0.2%,Cr:YAG晶体的初始透过率为67%。10 W激光泵浦时,1176 nm激光平均输出功率为123 mW,调Q包络宽度为6 ns,调Q包络内的锁模脉冲重复频率高达1 GHz。588.2 nm 黄光的平均输出功率为8 mW。     

激光二极管端面泵浦的调Q内腔倍频Nd：YAG激光器

报道了用两个１．５Ｗ激光二极管偏振耦合端面泵浦的声光调Ｑ内腔倍频Ｎｄ：ＹＡＧ激光器。输出５３２ｎｍ绿光重复频率１ＫＨｚ时，最大峰值功率为２．２３ＫＷ，最窄脉宽为１８ｎｓ，平均功率４０ｍＷ。最高重复频率３０ＫＨｚ。重复频率１５ｋＨＺ时，最高平均率１２８ｍＷ。对声光调Ｑ内倍频Ｎｄ：ＹＡＧ激光器的动态特性进行了理论分析及计算。     

The first-stokes pulse generation in Nd:KGW intracavity driven by a diode-pumped passively Q-switched Nd:YAG/Cr<Superscript>4+</Superscript>:YAG laser

The operation of an all solid-state pulsed Nd:KGW Raman laser pumped by compact passively Q-switched Nd:YAG/Cr:YAG laser is demonstrated. The first-Stokes radiation of stimulated Nd:KGW Raman scattering at the 1178 nm is generated. The average output power of 336 mW at Stokes wavelength was obtained under the laser diode pump power of 5.74 W. The corresponding optical efficiency from the diode light to the Raman output is 9.85%. The pulse width of 1.65 ns and a pulse repetition rate of 10 kHz were also obtained.     

LD泵浦Nd：YAG激光器的连续激光输出和高重复率调Q

用连续输出１Ｗ国产多量子阱激光二极管列阵（ＭＱＷ－ＬＤＡ）泵浦Ｎｄ：ＹＡＧ固体激光器，连续激光输出最大功率为１１２ｍｗ，光－光效率为１０．６％，斜效率为２０％．实现了连续泵浦高重复频率（１ｋＨｚ，４ｋＨｚ，１０ｋＨｚ）调Ｑ输出，最大峰值功率为３５５Ｗ，最大平均功率为４３．７ｍｗ．     

880 nm LD pumped passive Q-switched and mode-locked Nd:YVO<Subscript>4</Subscript> laser using a single-walled carbon nanotube saturable absorber

We report a 880 nm LD pumped passive Q-switched and mode-locked Nd:YVO₄ laser using a single-walled carbon nanotube saturable absorber (SWCNT-SA). At the pump power of 7.78 W, the average out-put power of 330 mW of Q-switched and mode-locked laser with optical conversion efficiency of 4.2% was generated. The repetition rate and pulse width of the Q-switched envelope were 33 kHz and 5.6 μs, respectively. The repetition rate and pulse energy of the mode-locked pulse within the Q-switched envelope were 80 MHz and 4.1 nJ, respectively.