共查询到19条相似文献,搜索用时 78 毫秒
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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
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结合特殊的谐振腔设计和半导体可饱和吸收镜,建成了一台低阈值的自启动掺钛宝石激光器 . 分别用3%和12%的输出耦合镜,获得了阈值低至390mW和600mW的稳定锁模脉冲输出. 采 用12%输出耦合镜,在12W抽运时,输出平均功率为114mW,对应的典型脉宽为17fs,谱宽 为47nm. 相对于以往的低阈值克尔透镜锁模激光器,锁模工作的范围区域加宽,减小了操作 难度,提高了稳定性.
关键词:
低阈值
半导体可饱和吸收镜
克尔透镜锁模
掺钛蓝宝石激光器 相似文献
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由于超短脉冲激光器的谐振腔大都采用多镜折叠的形式,像散已成为影响锁模激光器性能优劣的重要问题.本文提出了一种基于传播圆补偿像散的被动锁模激光器谐振腔设计方法,该方法简单、直观、高效,容易找到补偿像散的最佳位置.理论研究表明,当SESAM位于子午和弧矢传播圆交汇处附近时,SESAM处的子午光斑和弧矢光斑大小几乎相等,像散得到补偿.该谐振腔对外界干扰引起的腔镜振动和热透镜焦距的变化均不敏感,谐振腔的抗干扰性很强.实验研究表明,当SESAM位于子午和弧矢传播圆交汇处附近时,锁模激光器可获得稳定连续的锁模激光脉冲,且激光器的抗干扰性很强.本文的理论研究与实验结果相一致. 相似文献
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电光腔倒空激光二极管抽运Nd:YAG锁模激光器 总被引:1,自引:0,他引:1
设计了一个简单的直腔。将电光腔倒空与激光二极管端面抽运Nd:YAG半导体可饱和吸收镜锁模激光器结合,实现了锁模脉冲的产生、放大和输出。在连续抽运功率5W的条件下。获得了脉冲宽度为11ps的锁模单脉冲输出和脉冲宽度为200ns的调Q脉冲输出,腔倒空单脉冲能量为30nJ,重复频率为10Hz。连续锁模运转时单个锁模脉冲的能量约为2nJ。利用腔倒空将单脉冲的能量提高了15倍左右。文章详细讨论了腔倒空脉冲及调Q脉冲的产生机理,并分析了加在电光晶体上的高压电脉冲以及偏振片的偏振度对腔倒空脉冲及调Q脉冲的影响。 相似文献
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对半导体抽运的Yb∶YAG克尔透镜锁模激光器进行理论分析计算,分析五镜谐振腔和四镜谐振腔的稳区不同,利用稳区范围变化对五镜谐振腔稳定锁模机理做出合理解释.详细计算分析Yb∶YAG激光器内克尔调制效应对锁模的影响,获得最佳腔参量.在腔内没有插入硬光阑的情况下,利用五镜腔实现了Yb∶YAG晶体克尔透镜锁模运转.理论分析和实验结果相符. 相似文献
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Sub-two-cycle pulses from a Kerr-lens mode-locked Ti:sapphire laser 总被引:15,自引:0,他引:15
Morgner U Kärtner FX Cho SH Chen Y Haus HA Fujimoto JG Ippen EP Scheuer V Angelow G Tschudi T 《Optics letters》1999,24(6):411-413
Pulses shorter than two optical cycles with bandwidths in excess of 400 nm have been generated from a Kerr-lens mode-locked Ti:sapphire laser with a repetition rate of 90 MHz and an average power of 200 mW. Low-dispersion prisms and double-chirped mirrors provide broadband controlled dispersion and high reflectivity. These pulse durations are to our knowledge the shortest ever generated directly from a laser oscillator. 相似文献
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A stable continuous wave mode-locked picosecond Ti:sapphire laser by using a fast
semiconductor saturable absorber mirror (SESAM) is demonstrated. The laser delivers
pulse width of 20 ps at a central wavelength of 813 nm and a repetition rate of 100
MHz. The maximum output power is 1.34 W with pump power of 7 W which corresponds to
an optical--optical conversion efficiency of 19.1%. 相似文献
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A Kerr-lens mode-locked Ti:sapphire laser operating in a
non-soliton regime is demonstrated. Dispersive wave generation is
observed as a result of third order dispersion in the vicinity of
zero dispersion. The characteristics of the Ti:sapphire laser
operating in a positive dispersion regime are presented, where the
oscillator directly generates pulses with duration continuously
tunable from 0.37~ps to 2.11~ps, and 36~fs pulses are achieved after
extracavity compression. The oscillation is numerically simulated
with an extended nonlinear Schr?dinger equation, and the
simulation results are in good agreement with the experimental
results. 相似文献
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《中国物理 B》2019,(9)
We report a direct blue-diode-pumped wavelength tunable Kerr-lens mode-locked Ti: sapphire laser.Central wavelength tunability as broad as 89 nm(736–825 nm) is achieved by adjusting the insertion of the prism.Pulses as short as 17 fs are generated at a central wavelength of 736 nm with an average output power of 31 mW.The maximum output power is 46.8 mW at a central wavelength of 797 nm with a pulse duration of 46 fs. 相似文献
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We report an enhancement cavity for femtosecond Ti:sapphire laser at the repetition rate of 170 MHz. An enhancement factor of 24 is obtained when the injecting pulses have an average power of 1 W and a pulse duration of 80 fs. By placing a BBO crystal at the focus of the cavity, we obtain a 392-m W intracavity doubled-frequency laser, corresponding to a conversion efficiency of 43%. The output power has a long-term stability with a root mean square(RMS) of 0.036%. 相似文献
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Theoretical studies on beam parameters of a self-start ring cavity Ti:sapphire laser¥ZHANGGuizhong;ZHENGXuemei;WANGQingyue(De... 相似文献
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We experimentally and numerically demonstrated that self-focusing acts as a slow-varying control parameter that suppresses the transient chaos to reach a stable mode-locking (ML) state in a self-starting Kerr-lens mode-locked Ti:sapphire laser without external modulation and feedback control. Based on Fox–Li’s approach, including the self-focusing effect, the theoretical simulation reveals that the self-focusing effect is responsible for the self-adaptation. The self-adaptation occurs at the boundary between the chaotic and continuous output regions in which the laser system begins with a transient chaotic state with fractal correlation dimension, and then evolves with reducing dimension into the stable ML state. 相似文献
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通过在钛宝石激光腔内引入望远镜长腔系统增加腔长,实现了重复频率低到10?MHz的飞秒激光振荡,在5?W的抽运功率下获得了平均输出功率200?mW、单脉冲能量20?nJ的稳定输出. 在此基础上分析了腔内不同色散情况下的输出脉冲光谱和脉宽特性,结果表明在腔内存在一定负色散的情况下,锁模脉宽可接近转换极限,最短脉宽可达56?fs. 而在正色散的情况下,锁模输出的脉宽较宽,并且随着腔内正色散的增多,脉宽可到大于600?fs,锁模光谱也呈马鞍形.
关键词:
钛宝石激光器
飞秒脉冲
低重复频率
望远镜腔 相似文献