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Kai Wang Huan-yu Li Jian-ping Li Zhi-gang Zhang Ning Zhang Lu Chai Qing-yue Wang 《Optics Communications》2006,265(2):369-372
Recently, the semiconductor saturable absorber mirror (SESAM) has become a key component of passive mode-locked solid-state lasers. Here we present a simple method based on the reflection Z-scan technique to measure the key optical parameters of SESAM such as saturation fluence and modulation depth. The experimental results demonstrate that our method is able to perform with a high accuracy of 10−4 and a dynamic range of over four orders of magnitude. 相似文献
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Jianming Dai Weili Zhang Lizhe Zhang Lu Chai Yong Wang Zhigang Zhang Qirong Xing Ching-yue Wang Kenji Torizuka Tadashi Nakagawa Takeyoshi Sugaya 《Optics & Laser Technology》2001,33(2)
In this paper, a self-starting, diode-pumped self-mode-locked Cr:LiSGAF laser, which produced a stable pulse train of 45 fs duration with about 20 mW-average power at the repeated rate of 90 MHz, was presented. Self-mode-locked operation can be obtained whether there is the semiconductor saturable absorber mirror (SESAM) in the Cr:LiSGAF laser cavity or not, and with the SESAM in the cavity, the self-mode-locked operation could self-start. The shortest pulses, as short as 38 fs, which were not very stable, were obtain with the SESAM in the cavity. 相似文献
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半导体可饱和吸收镜被动锁模侧面抽运Nd:YAG激光器研究 总被引:2,自引:0,他引:2
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. 相似文献
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Pumped by a 940 nm fiber-coupled diode laser, a passively mode-locked Yb:YAG thin disk oscillator was demonstrated with a semiconductor saturable absorber mirror(SESAM). 12.1 W mode-locked pulses were obtained with pulse duration of 698 fs at the repetition rate of 57.43 MHz. Measurement showed that the beam quality was close to the diffraction limit. 相似文献
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报道了一种具有热稳腔设计实现1064 nm皮秒脉冲激光输出的被动锁模Nd∶YVO4激光器。并在此基础上,不改变锁模条件激光模式的同时引入Herriott型多程腔来增加腔长,使总腔长达到38.7 m。采用光纤耦合输出的808 nm激光二极管对Nd∶YVO4晶体进行端面抽运,以半导体可饱和吸收镜作为被动锁模元件,获得了重复频率低至3.9 MHz的皮秒激光脉冲,脉宽为60 ps。在泵浦功率为10 W时,平均输出功率为2.6 W,对应单脉冲能量0.67 μJ,x和y方向的光束质量因子分别为1.01和1.11。 相似文献
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The efficient cw mode locking (cw-ML) regime was demonstrated in Nd:YVO4 laser by means of saturable absorber mirror (SAM). The 0.3-at.% Nd3+ doped 10-mm-long YVO4 crystal end pumped by 20-W diode module with a beam shaper was applied as a gain medium located in the close vicinity to
the rear flat mirror of the first arm of Z-type resonator of 316 cm total length with two curved mirrors of 100-cm curvature
radii. The SAM of 2%-saturable absorptance and saturation fluence of 50 μJ/cm2 was mounted at the opposite end of a resonator. The developed “dynamically stable” cavity design mitigates detrimental role
of thermal aberration in gain medium, enforcing clean perfect mode locking even for the highest pump densities. The cw-ML
pulses with 47.5 MHz repetition rate and pulse durations in the range of 15–20 ps were observed for a wide range of pump powers
and output coupler losses. In the best case, for 32% of output coupler transmission, up to 6.2 W of average power with near
35% slope efficiency was achieved. The thresholds for Q-switched ML, cw-ML regimes were 2.67 W and 6.13 W of pump power, respectively.
For the maximum pump power of 20 W we obtained 133 nJ of pulse energy with 16-ps pulse duration, resulting in a peak power
higher than 8 kW. The threshold energy density at SAM giving the QML regime was estimated to be about 30 μJ/cm2, threshold of cw-ML regime was 220 μJ/cm2. 相似文献
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基于半导体可饱和吸收镜(SESAM)的负克尔效应,对含SESAM的五镜腔进行了理论计算和分析.结果表明,由于SESAM的负克尔效应,与没有SESAM的相比,锁模激光器的稳区在上稳区的内边缘有明显扩展,这使得激光器锁模启动的工作点更加靠近直流运转时的稳区边缘,从而获得更大的非线性因子.这说明SESAM的可饱和吸收机理具有锁模自启动效应外,其负克尔效应也有助于锁模的自启动.
关键词:
半导体可饱和吸收镜
负克尔效应
五镜腔 相似文献