平均功率近2 W的被动锁模皮秒掺镱光纤激光器

报道了一个三级主振荡功率放大(MOPA)结构的瓦级皮秒光纤激光器.第一级利用半导体可饱和吸收镜(SESAM)和光纤光栅组成线性腔,构建了一个低功率的被动锁模掺Yb3+光纤激光器,其最大平均输出功率为9.2 mW,作为整个激光器的种子源;第二级采用单模掺镱光纤放大器对种子光进行预放大,得到108 mW平均输出功率;第三级采用带树状耦合器的双包层掺镱光纤放大器进行功率放大,获得了1.9 W平均输出功率.得到的脉冲脉宽36 ps,中心波长1064 nm,重复频率29.6 MHz,峰值功率1.8 kW,相应的单脉冲能量为61 nJ.实验中观察到种子源输出光谱中有一个凹陷,这是由于光纤光栅反射率过高并且带宽较窄引起的.     

激光二极管抽运掺Yb3+光纤放大器获得2.41W超短脉冲输出

对国产掺镱(Yb3 )双包层大模场面积光纤超短脉冲放大器进行了系统的实验研究。以自己搭建的脉冲宽度为2.3ps,重复频率为95MHz的全固态锁模激光器作为种子源,以976nm大功率光纤耦合激光二极管为抽运源,以1.6m国产掺Yb3 双包层大模场面积光纤为增益介质,在11.2W的入纤抽运功率下,将平均功率为100mW的脉冲种子光放大到平均功率2.41W,单脉冲能量达到了25nJ,放大后脉冲的宽度(时域宽度)和光谱都有所展宽。     

基于6H-SiC衬底外延石墨烯的被动锁模掺镱光纤激光器

报道了6H-SiC衬底外延生长的石墨烯作为可饱和吸收体,环形腔结构的全正色散被动锁模掺镱光纤激光器。在注入抽运功率为250mW时,得到稳定的重复频率为1.05MHz的自锁模脉冲,平均输出功率为6mW;当注入抽运功率增加到480mW时,最大平均输出功率为20mW,相应的最高单脉冲能量为19nJ,激光脉冲宽度约为520ps。     

2.5 GHz and 5 GHz harmonic mode-locking of a diode-pumped bulkerbium-ytterbium glass laser at 1.5 microns

Third-order harmonic mode locking of a diode-laser pumped bulk Er:Yb:glass laser by frequency modulation with a lithium niobate modulator is reported. Stable pulses at a repetition rate of 2.5 and 5 GHz with a pulse duration down to 9.6 ps are obtained. The average output power is 3 mW, the pulse peak power is 120 mW at 2.5 GHz repetition rate, and the pulses are approximately 1.4 times transform limited. The pulse duration can be increased up to 30 ps by decreasing the mode-locker drive power     

CW injection seeding of a modelocked semiconductor laser

The authors extended the injection locking technique to control the output of a modelocked semiconductor laser with an external continuous-wave (CW) signal. With this injection seeding technique, over 8 mW of average power in 30 ps pulses with side cluster suppression of over 20 dB was obtained from an actively modelocked AlGaAs semiconductor laser. This average output power compares favorably with the 12 mW W output power of the extended resonator. The frequency spectrum of the laser is determined by the background noise level as set by the spontaneous emission. Injection seeding overrides the noise and concentrates over 99% of the available energy in a single nearly transform-limited pulse     

瓦级输出全光纤结构2.0μm掺铥皮秒脉冲光纤激光器

研制了高功率全光纤结构2μm波段掺铥皮秒脉冲光纤激光器。该激光器采用了主振荡功率放大(MOPA)结构设计,种子源采用790nm的多模半导体激光器作为抽运源、双包层掺铥光纤作为激光增益介质、半导体可饱和吸收镜(SESAM)作为锁模器件,从而实现了重复频率为10.4MHz的皮秒激光脉冲输出,其最大平均输出功率为15mW。种子源经过一级掺铥光纤放大器后,获得了1.1W高平均功率输出,相应的单脉冲能量高达105nJ,激光脉冲宽度为9ps,峰值功率为11.6kW。此时测得激光脉冲的中心波长为1963nm,3dB光谱带宽为0.5nm。     

NdLMA激光器的附加脉冲锁模

用半导体激光泵浦ＮｄＬＭＡ激光器在１．０５４μｍ波长处获得连续６５０ｍＷ的激光输出，斜效率达３３％。利用一个包含光纤的非线性外腔，实现了自启动的ＮｄＬＭＡ附加脉冲锁模，输出平均功率为５８ｍＷ的接近带宽转移极限的１．８ｐｓ超短脉冲激光     

基于SESAM的全光纤被动锁模光纤激光器

研究实现了一种主振荡功率放大（MOPA）结构的高功率全光纤皮秒级被动锁模掺镱（Yb3+）光纤激光器。种子源为基于半导体可饱和吸收镜（SESAM）的锁模光纤激光器,其为线性腔结构,输出功率为5.97 mW;预放大级采用单模掺镱光纤进行放大,之后经过4倍重复频率倍增系统和两级双包层掺镱光纤放大器,最终实现了平均功率74.3 W,中心波长1063.4 nm,脉冲宽度7.0 ps,重复频率68 MHz的锁模脉冲激光输出。实验中通过对种子光的处理和光纤长度的控制,未出现受激布里渊散射（SBS）、受激拉曼散射（SRS）等非线性效应。     

354.7nm ps强紫外激光

用两块Ⅱ类KDP晶体对主被动锁模YAG激光输出进行倍频及和频,在入射光强度为1.27GW/cm~2条件下,得到脉冲宽度为32ps、峰值功率30MW、平均功率60mW和重复率为20Hz的稳定的354.7nm激光。     

基于石墨烯的被动锁模掺铒光纤孤子激光器

报道了石墨烯作为可饱和吸收体的被动锁模掺铒光纤孤子激光器。采用环形腔结构,在抽运功率为370.4mW时,产生了重复率为3.16MHz,脉宽约为1.32ps,平均输出功率为1.07mW的锁模脉冲,其单脉冲能量为0.338nJ,并观察到激光中心波长在1556.72～1558.76nm之间可调。基于Ginzburg-Landau方程进行了数值模拟,得到的结果和实验一致。     

百皮秒激光脉冲的全光纤放大及应用

为了得到高单脉冲能量的百皮秒激光脉冲,采用自制的被动锁模掺镱光纤激光器获得了100ps的激光脉冲输出,在此基础上采用两级全光纤结构主振荡功率放大器进行功率放大,其中预放大级采用7m纤芯的双包层掺镱光纤做增益介质,得到平均功率160mW的稳定脉冲输出;主放大级采用20m纤芯的双包层掺镱光纤做增益介质,在抽运功率逐步增加到35.37W时,输出功率达到了16.60W,相应的单脉冲能量为1.63J,峰值功率为16.61kW。此外,主放大级输出的激光通过自制的模场转换器与光子晶体光纤(纤芯4.6m)成功熔接,得到了2.85W的白光超连续光谱,光谱波长覆盖了600nm~1700nm的检测范围。结果表明,此激光可用于超连续谱光源的产生。     

LD泵浦Nd:Gd0.42Y0.58VO4/Cr4 :YAG被动调Q锁模激光器

报道了一种激光二极管（LD）泵浦Nd：Gd0.42Y0.58VO4/Cr^4＋：YAG/KTP结构的被动调Q锁模绿光激光器,采用简单、结构紧凑的平凹腔设计.在注入泵浦功率7.8 W时,调Q锁模绿光平均输出功率为200 mW,调制深度约为40%,脉冲包络重复频率200 kHz,半高宽度100 ns.     

Q-switched and Mode-locked Characteristics of Cr4+:YAG Crystal

The passively Q-switched and mode-locked(QML) characteristics in a diode-pumped Nd:GdVO4 laser with Cr4 :YAG saturable absorbers have been demonstrated. A maximum average output power of 710 mW has been obtained in the QML laser. The maximum energy of a single Q-switched pulse is 52.5 μJ,with the corresponding pulse width of 30 ns and the peak power of 1.75 kW,at the incident pump power of 7.75 W. The repetition rates of the Q-switched envelope and the mode-locked laser pulse are 16.7 kHz and 680 MHz,respectively.     

Q-switched and Mode-locked Characteristics of Cr^4＋： YAG Crystal

The passively Q-switched and mode-locked （QML） characteristics in a diode-pumped Nd： GdVO4 laser with Cr^4＋： YAG saturable absorbers have been demonstrated. A maximum average output power of 710 mW has been obtained in the QML laser. The maximum energy of a single Q-switched pulse is 52.5μJ, with the corresponding pulse width of 30 ns and the peak power of 1.75 kW, at the incident pump power of 7. 75 W. The repetition rates of the Q-switched envelope and the mode-locked laser pulse are 16.7 kHz and 680 MHz, respectively.     

重复率YAG激光脉冲同步泵浦染料激光器

用热稳定腔主被动锁模重复率脉冲YAG激光器的倍频光,同步泵浦R6G染料激光器。获得平均功率14mW,单脉冲峰值功率大于5MW,单脉冲宽度28ps,脉冲列重复率为20pps。可调范围为555.0至586.5nm,谱线宽度约0.1nm,最窄谱宽为0.04nm,转换效率11％的可调谐激光。     

Simple repetition rate tunable picosecond pulse-generating 10 GHz laser

A compact, passively fundamental-mode-locked, optically pumped Er:Yb:glass laser where the pulse repetition rate is continuously tunable in the range 8.8-13.3 GHz is demonstrated. The average output power exceeds 20 mW, and the pulse duration is between 1.7 and 1.9 ps over the whole tuning range. Tuning is turnkey and the main laser parameters remain unchanged during tuning.     

550～689nm重复率YAG激光同步泵浦染料激光器

用重复率脉冲锁模YAG激光同步泵浦四种激光染料,获得脉冲重复率20Hz、峰值功率MW级、平均功率mW级、脉宽30ps染料激光。波长复盖范围为550.0～689.0nm,谱线宽度0.05nm。实验比较了L_D=1/2L_PF和L_D=L_P两种匹配腔的输出特性。     

High-power, mode-locked Nd:fibre laser pumped by aninjection-locked diode array

A neodymium-doped fibre laser has been actively mode-locked to produce pulses shorter than 120 ps using an intracavity acousto-optic loss modulator. The laser operated at 1.088 μm at an average power of 5 mW when pumped by an injection-locked diode array, which coupled approximately 40 mW of 0.82 μm into the fibre. A peak pulse power of 1 kW was obtained in Q-switched operation     

非线性光纤环形镜掺铒光纤激光器的实验研究

为了研究掺铒光纤激光器超短脉冲的产生,采用增益平坦型掺铒光纤放大器、两个偏振控制器以及3个耦合器,利用非线性光纤环形镜加成脉冲锁模技术,通过改变偏振控制器的方向,获得最大输出功率为0.6mW的脉冲输出,对应的光谱宽度9nm、中心波长1561nm、脉冲宽度434ps、脉冲的重复频率为1.1MHz.该脉冲经过掺铒光纤放大器放大后,最大输出功率为10.8mW.放大后锁模脉冲的中心波长保持不变、光谱带宽稍有变窄、输出功率明显增大、脉冲宽度展宽为495ps.实验结果表明,采用商用的掺铒光纤放大器可实现结构简单、调节方便的掺铒光纤激光器超短脉冲输出,且掺铒光纤激光器可以实现自启动,并长时间稳定锁模工作.     

Compact long-life high PRF 722.9 nm neutral lead vapor laser

Several new construction techniques for a compact long-life high pulse-repetition frequency (PRF) 722.9 nm neutral lead vapor laser are described. A quartz discharge envelope, coaxial oven, and controlled semiself-heating techniques were employed. An average laser output power of 90 mW at a pulse repetition rate of 5 kHz has been obtained with a discharge efficiency of 0.03 percent.