中间镜式半导体可饱和吸收镜在Nd∶YVO4激光器中被动调Q特性研究

利用一种新型的中间镜式半导体可饱和吸收镜,成功实现了二极管泵浦Nd∶YVO4激光器调Q运转,获得的最短脉冲宽度为8.3 ns,最大平均输出功率为135 mW,重复频率在400 KHz到2 MHz之间.利用这种吸收体被动调Q得到的重复频率大大高于所知的大多数吸收体所进行的被动调Q的重复频率.     

连续锁模Nd：YVO4激光器实现1 GHz高频输出

LD抽运全固体Nd:YVO4激光器在连续锁模状态运转下获得了高达1 GHz的重复频率.实验中采用半导体可饱和吸收镜作为锁模元件.利用透过率只有0.8%的输出镜以及可获得较小抽运光斑的2 W LD作为抽运源来优化激光器设计,有效地抑制了调Q锁模状态的运转.低的激光器振荡阈值（35 mW）和连续锁模阈值(0.8 W)显示了饱和吸收体低的插入损耗和激光器合理的设计.在最大抽运1.6 W时获得了210 mW的平均输出功率.     

Efficient Mode-locked and Q-switched Nd∶YVO4 Laser with Semiconductor Saturable Absorber Mirror

We reported an efficient diode pumped Nd∶YVO4 1 064 nm laser passively mode-locked and Q-switched by a semiconductor saturable absorber mirror(SESAM). At the incident pump power of 7.5 W, 2.81 W average output power was obtained during stable CW mode locking with a repetition rate of 111 MHz. The optical conversion efficiency was 37.5%, and the slope efficiency was 39%. So far as we know, this is the highest optical-optical conversion efficiency with a SESAM at home.     

SESAM锁模OP-VECSELs技术

综述了半导体可饱和吸收镜(SESAM)锁模光抽运垂直外腔面发射半导体激光器的理论,分析总结了相关实验技术手段,对SESAM锁模OP-VECSELs的最新研究成果作了介绍.     

Passively Q-switched Er-doped fiber laser using a semiconductor saturable absorber mirror

A passively Q-switched Er-doped fiber laser using a semiconductor saturable absorber mirror (SESAM) is demonstrated. Q-switching is observed with the output power produced at a slope efficiency of 29.4% with respect to the absorbed pump power. The maximum average output power of 8.37 mW is achieved. The pulse repetition frequency obtained can be turned from 1.72 to 7.95 kHz. The pulse energy of 17.2 nJ has been obtained at the pump power of 46.75 mW, and the pulse width is 30 μs.     

Laser-diode end-pumped intracavity frequency doubling semiconductor saturable absorber mirror passively mode-locked picosecond lasers

A diode pumped Nd:YVO₄ semiconductor saturable absorber mirror (SESAM) passive mode-locked intracavity frequency doubled laser was studied. A type II phase matching KTiOPO₄(KTP) crystal and a type I phase matching LiB₃O₅ (LBO) frequency doubling crystal were respectively inserted in the cavity. With a pump power of 4.5 W, a 90 mW output of frequency doubled beam and 29.7 ps pulse duration were achieved with frequency doubled by KTP. With the same pump power a 140 mW output of frequency doubled beam and 3.67 ps pulse duration were achieved with LBO.     

用半导体可饱和吸收镜进行LD泵浦Yb∶YAG激光器被动锁模研究

采用不同的半导体可饱和吸收镜,实现了940nm半导体直接泵浦Yb∶YAG激光器被动锁模,得到了输出中心波长分别在1030nm和1050nm,光谱半宽(FWHM)分别为1nm和2nm的稳定锁模脉冲序列,其重复频率分别为190. 24MHz和178. 6MHz 泵浦光为4W时,两种波长的平均输出功率分别为80mW和60mW。     

飞秒激光作用蓝宝石光纤产生超连续谱的研究

对飞秒激光作用蓝宝石光纤产生超连续谱进行了实验研究。选用脉冲宽度为50 fs的飞秒激光器作为泵浦光,9 cm蓝宝石光纤为非线性介质;当激光器中心波长分别为1200 nm、1300 nm、1400 nm、1500 nm时,在蓝宝石光纤输出端均可获得红外和可见波段的超连续光源;为了寻求可见波段更好的超连续光源输出,在实验装置中加入半导体可饱和吸收体（SESAM）,利用光纤端面和SASEM构成谐振腔,通过SESAM的反馈实现多次作用光纤。结果表明,在可见波段内能够获得460~780 nm平坦稳定的超连续光源输出。     

半导体激光器端面泵浦Nd:YAG激光器用In0.25Ga0.75As吸收体被动锁模兼做输出镜

用金属有机气相淀积方法生长了一种新型的吸收体--低温InGaAs (LT-In0.25 Ga0.75 As).用这种吸收体兼做输出镜,实现了1.06μm半导体端面泵浦Nd∶YAG激光器被动锁模,脉冲宽度为皮秒量级,重复率为150MHz.     

自锁模Cr4+∶YAG激光器的色散补偿研究

从棱镜对补偿色散的原理出发,介绍了Cr4+∶ YAG锁模激光器中色散补偿的特点,发现熔融石英作为色散补偿元件,不仅可以完全补偿二阶色散,而且三阶色散也得到了一定的补偿,并得到了脉冲宽度最小为65 fs,中心波长为1520 nm,重复频率为120 MHz的脉冲序列.