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高功率2 μm波长可调谐的超短脉冲激光具有峰值功率高、脉冲宽度窄、波长可调谐等优势,在医疗手术、大气通信、光电对抗等领域具有广泛的应用。利用高峰值功率的掺铒光纤放大器泵浦高非线性光纤,在全光纤化结构中获得了1895~2165 nm可调谐的拉曼孤子输出。采用啁啾脉冲放大技术对拉曼孤子的脉冲能量进行提升,放大后拉曼孤子的单脉冲能量为1.56 μJ,平均功率达到50.6 W,脉冲宽度为83 ps。经过光栅对压缩后,脉冲宽度降低至1.23 ps,平均功率为22 W,峰值功率达到0.55 MW。放大后的脉冲仍具有波长调谐的能力,当输出功率为5 W和50.6 W时,脉冲的波长调谐范围分别为38 nm和8 nm。 相似文献
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用半导体激光器作调制器的双波长可调谐锁模光纤激光器 总被引:5,自引:2,他引:3
提出一种用法布里—珀罗腔半导体激光器(F—PLD)作调制器,用线性凋啾光栅(LCFG)进行波长选择的双波长环形腔主动锁模光纤激光器。利用线性凋啾光栅在腔内的色散效应使两个波长的光脉冲通过饵光纤(EDF)时在时域上分开,从而威小了不同波长的光脉冲同时通过饵光纤时造成的竞争,因此可以在室温下获得波长间隔较小的稳定的双波长光脉冲输出。实验中成功地获得了重复频率约为2GHz,波长间隔为0.92nm的稳定双波长光脉冲,并通过调谐线性凋啾光栅中心波长的位置使激光波长可以在约3nm范围内调谐。 相似文献
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报道了两个增益开关调制的法布里-珀罗半导体激光器互注入锁定实验方案,可产生双波长可调谐光脉冲。该装置对两个结构基本相同的法布里珀罗半导体激光器做增益开关调制,产生多模光脉冲输出;然后利用两个光纤光栅作为滤波元件,通过调节可调谐光延迟线(VODL2),可使得双波长光脉冲在两个法布里-珀罗激光器之间相互注入锁定.从而在输出端得到高边模抑制比的双波长光脉冲输出。然后再通过应力作用在两个光纤光栅上以改变它们的反射波长和适当调整另一个可调谐光延迟线(VODLI)长度.可得到不同的双波长的光脉冲输出,而重复频率保持524.6MHz不变。在13.2nm调谐范围内边模抑制比高于25dB.系统稳定且波长调节方便。 相似文献
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基于多模光纤滤波器的可调谐掺铒光纤激光器 总被引:1,自引:0,他引:1
研究了一种新型、全光纤、宽带可调谐环形腔掺铒光纤激光器。该激光器利用由单模-多模-单模光纤组成的滤波器实现波长可调谐及激光器的全光纤结构。该滤波器将多模光纤缠绕在偏振控制器上,两端分别与一段单模光纤相连,通过调整偏振控制器的状态,实现了中心波长1542~1560nm的不同激光输出。单波长连续可调谐激光器的波长可调范围为18nm,边模抑制比大于40dB,3dB线宽为0.096nm;进一步调整偏振控制器的状态和抽运功率,实验同时得到了连续可调谐的双波长、三波长等多波长激光输出。对于可调谐的多波长激光器,通过调整偏振控制器的状态,可实现波长间隔及输出中心波长两者可调。 相似文献
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可调谐光纤激光器可广泛应用于光纤通信、光纤传感、激光光谱、精密测量和激光加工等诸多领域。针对目前可调谐激光器在调谐性、灵活性、稳定性和多波长功率均衡性等方面的不足,提出一类新型的基于数字微镜器件(DMD)的多波长宽带可调谐光纤激光器。该激光器利用关键器件DMD作为波长调谐器,掺铒光纤作为激光增益介质,通过巧妙的光学设计,实现仅利用一块DMD芯片独立、灵活、稳定调谐多波长激光输出的目的。该激光器具有3个输出通道,各通道之间独立开关控制,每个通道均可实现波长在1530~1560nm之间的连续可调谐输出,波长调谐精度0.055nm/pixel,边模抑制比大于55dB,激光输出功率最大值为10mW,2h内的中心波长漂移小于0.02nm。 相似文献
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A novel colliding-enhanced Cr:LiSAF broad-band phase-conjugate resonator (PCR) has been investigated theoretically and experimentally. This kind of PCR is a low initiating threshold resonator. It can produce self-Q-switching narrow pulse with about 35 ns duration (FWHM), efficiently correct intracavity phase aberrations, and severalfold improve output laser beam quality. 相似文献
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J. Hebling 《Applied physics. B, Lasers and optics》1988,47(3):267-272
The behaviour of an excimer-laser-pumped distributed feedback dye laser (ELP DFDL) using a mixture of saturable absorber and laser dye as an active medium was studied. In a DFDL self-Q-switching occurs because of the population inversion dependence of the feedback. If the DFDL contains absorber saturation of the absorption by the leading edge of the created laser pulse also causes Q-switching. As a result of this double self-Q-switching, mixing a saturable absorber into the laser dye, the laser pulses become shorter and more stable. This was demonstrated experimentally. Mixing Rhodamine B into the dye solution of a Coumarin 153 ELP DFDL, a six-fold reduction in the pulse duration and a more than two-fold reduction in the pulse energy instability were observed. The experimental results were in good qualitative agreement with the predictions of a simple rate equation model. 相似文献
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Fuyun Lü 《中国光学快报(英文版)》2006,4(11)
In this paper, the generation of dual-wavelength stable nanosecond pulses by a laser diode pumped Ybdoped double-clad fiber laser is presented. In the experiment, the fiber laser with two-mirror cavity is approved which operates in a self-Q-switching regime. The Q-switching mechanism is based on stimulatedBrillouin scattering (SBS). When the pump power achieves the SBS threshold, the fiber laser changes from the start resonator to the SBS resonator. With different reflectivities of the second mirror, stable dual-wavelength pulses with the pulse width range from 10 ns to less than 2 ns are obtained. The resultwas explained theoretically by birefringency (including stochastic birefringency and bend birefringency). 相似文献
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本文报导了在同样气压等条件下,喇曼池的聚焦透镜对自调Q及BDN调Q甲烷喇曼激光器的影响,并对两者进行了比较。 相似文献
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We report experimental and theoretical evidence of the existence of extreme value events in the form of scarce and randomly emerging giant pulses in the femtosecond (self-pulsing or Kerr-lens mode-locked) Ti:sapphire laser. This laser displays complex dynamical behavior, including deterministic chaos, in two different regimes. The extreme value pulses are observed in the chaotic state of only one of these two regimes. The observations agree with the predictions of a well-tested theoretical model that does not include noise or self-Q-switching into its framework. This implies that, in this laser, the extreme effects have a nontrivial dynamical origin. The Ti:sapphire laser is hence revealed as a new and convenient system for the study of these effects. 相似文献
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The influence of the feedback strength on the output intensity dynamics of anti-reflection coated broad area lasers in a Fourier-optical transverse-mode selective external 4f-setup is investigated numerically and experimentally. At certain pump current conditions the broad area laser (BAL) is operating in a repetitive self-Q-switching mode emitting 1-3 ns pulses at repetition rates of 200-500 MHz. Moreover the influence of longitudinal mode conditions on the BAL’s output dynamics is investigated. 相似文献
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通过在稳定连续波运转的Yb:YAG 激光器中插入不同掺杂浓度的新型钠、镱共掺的氟化钙晶体的对比性实验,证明了镱、钠共掺的氟化钙晶体在1050nm具有明显的可饱和吸收作用,从而解释了该晶体作为增益介质在该波段总是趋于自调Q运转的原因.Yb3+离子是该晶体可饱和吸收作用的主要因素,但是共掺入适当的Na离子可以明显改善晶体的调Q效果.优化共掺镱、钠离子的浓度和比例后的氟化钙晶体能够作为1050nm波段激光器的被动Q开关.
关键词:
镱、钠共掺氟化钙
可饱和吸收体
调Q 相似文献
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以电磁学的基础概念为出发点,系统性地阐述了脉冲功率产生过程的基本原理。采用统一的理论模型,描述了电磁能量的储存、传输和释放过程的物理规律。从特征阻抗的角度论述了储能器件、传输器件及开关等脉冲功率系统核心元素之间的区别与联系。在此基础上,解说了几种典型脉冲功率发生器的电路方法及其工作原理,它们包括脉冲形成线法、脉冲压缩法和场通量压缩法。 相似文献