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针对常规连续激光泵浦钛宝石激光振荡器不能自启动锁模的缺点,采用倍频飞秒光纤激光同步泵浦,通过调节振荡器腔长与泵浦腔长匹配,实现了飞秒钛宝石激光的自启动锁模。实验中采用3.4 W的倍频掺镱光纤激光同步泵浦钛宝石激光振荡器,获得了平均功率大于130 mW、重复频率75 MHz、光谱宽度大于47 nm、脉冲宽度17 fs的锁模脉冲输出,不仅能够稳定可靠地实现自启动锁模,解决了常规钛宝石激光振荡器锁模启动的困难,而且还具有同步输出1040,800,520 nm三束飞秒激光的特点,为进一步开展飞秒激光相干合成以及光参量放大等研究提供了优势基础。 相似文献
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飞秒激光脉冲的载波包络相移测量与控制是实现阿秒脉冲与光学原子钟的重要内容,在利用光子晶体光纤扩展飞秒钛宝石激光振荡器光谱的研究基础上,通过自参考技术测量并优化了该激光输出脉冲的载波包络相移所引起的拍频信号.实验上采用半导体抽运的倍频Nd:YVO4532nm激光器作为抽运源,对钛宝石激光器所产生的平均功率500mW、脉宽18fs的光脉冲进行拍频测量后观察到约23MHz的频移,对应于每周期053π的载波包络相移.飞秒激光脉冲载波包络相移测量的实现对于进一步利用电子反馈系统精确控制载波包络相移,从而得到高稳定的飞秒激光频率梳具有重要意义.
关键词:
载波包络相移
光子晶体光纤
飞秒
超连续 相似文献
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对作者所提出的无干涉条纹直接电场重构测量飞秒脉冲的振幅和相位的新方法作出进一步理论分析,并通过实验测量说明该方法的优越性.该方法克服了传统的SPIDER方法的弊病,能得到一组无干涉条纹的图像,排除传统方法必须使用傅里叶变换滤波消除干涉条纹而引进的系统误差,使得该方法能够采用较简便设备且能较准确测量飞秒脉冲强度轮廓和相位.最后给出同一条件下新方法和传统SPIDER方法分别重构的脉冲强度自相关曲线与实验测量结果的比较,以说明新方法的有效性和优越性. 相似文献
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G. Stibenz C. Ropers Ch. Lienau Ch. Warmuth A.S. Wyatt I.A. Walmsley G. Steinmeyer 《Applied physics. B, Lasers and optics》2006,83(4):511-519
We discuss and compare four methods for measuring the width and pulse profile of ultrashort pulses. For our comparison, we use stable sub-7 fs pulses from a Ti:sapphire oscillator. Interferometric autocorrelation, spectral phase interferometry for direct electric-field reconstruction (SPIDER), a spatially-encoded variant of SPIDER, and interferometric frequency-resolved optical gating (IFROG) are utilized for characterizing pulses from the oscillator. The methods are found to agree within 5% as far as determination of the pulse width is concerned. However, differences are observed in the satellite structure reconstructed by either method. The current state of the art of measuring ultrashort pulses with these methods is reviewed and current limitations, in particular for characterizing complex pulse shapes, are discussed. PACS 06.60.Jn; 07.60.Ly; 42.65.Re; 42.79.Hp 相似文献
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T. Fuji A. Unterhuber V.S. Yakovlev G. Tempea A. Stingl F. Krausz W. Drexler 《Applied physics. B, Lasers and optics》2003,77(1):125-128
Ultra-broad and smooth spectra are generated directly from a mirror-dispersion-controlled Kerr-lens mode-locked Ti:sapphire oscillator. The full width at half maximum of the spectrum is 277 nm. The pulse width is evaluated as 6.5 fs by using both interferometric autocorrelation and spectral phase interferometry for electric-field reconstruction. This compact, user-friendly source opens the door to routine implementation of ultra-high-resolution as well as spectroscopic optical coherence tomography in a clinical environment. PACS 42.60.By; 42.65.Re 相似文献
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In this paper, we report theoretical analysis of third order interferometric autocorrelation to achieve enhanced sensitivity towards pulse chirp and asymmetry. The analysis is based on interferometric correlative envelope (ICE) functions and ICE difference signals derived from interferometric autocorrelation signals. The third order ICE signals are compared with second order ICE signals obtained from a second order interferometric autocorrelation signals. It is shown that one out of six third order ICED signals may be used to obtain simultaneous detection and measurement of pulse chirp as well as pulse asymmetry of the chirped ultrashort laser pulse. This is in contrast to use of two out of three second order ICED signals for simultaneous detection of pulse chirp and asymmetry. 相似文献
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A simple method that uses envelope functions of unbalanced interferometric (auto/cross) correlation signals has been presented
for simultaneous visual detection of pulse chirp and asymmetry, without direction-of-time ambiguity in ultrashort laser pulses.
The ambiguity issues of unbalanced interferometric correlation envelope (ICE) difference signals have been studied. It is
found that unbalanced ICE difference signals are visually different corresponding to practically indistinguishable unbalanced
interferometric autocorrelation (IAC) signals for a distinct symmetric–asymmetric pulse pair with identical intensity autocorrelation
and power spectra. The theoretical analysis of ICE signals is supported by experimental unbalanced IAC signals obtained using
200 fs laser pulses from a cw mode-locked Nd:phosphate laser oscillator.
PACS 42.65.Re; 42.50.Hz; 07.60.Ly 相似文献
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We report a static single-shot configuration for measuring the sonogram trace of an ultrashort optical pulse. When it is combined with a CCD camera, the instrument provides an intuitive video-rate monitor of the pulse chirp, and it is equally compatible with a high-repetition-rate mode-locked oscillator and a low-repetition-rate amplified source. The performance of the instrument is described, and iterative retrieval of the measured sonogram trace, which yields complete and unambiguous pulse characterization, is demonstrated. 相似文献
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Using a variational method, we have investigated the propagation characteristics of a chirped optical pulse in anomalously dispersive media possessing saturating nonlinearity. For the special case of uniform loss less media, the dynamics of the temporal width of the pulse is shown to be equivalent to an oscillator of unit mass which is executing its motion under some effective potential well. The potential is examined and four different types of behavior of the pulse width are noticed. The role of saturation parameter and the initial chirp in determining the propagation characteristics have been examined. It is found that, both high value of chirp and saturation are detrimental to stable pulse propagation. Particularly, the effect of chirp becomes severe with the increase in the value of saturation. We have shown that incorporation of saturation in the nonlinearity leads to the existence of bistable soliton. For the case of a lossy medium, net broadening of width takes place over many cycles of oscillation. The net broadening decreases with the increase in the value of saturation. 相似文献
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Effect of initial chirp on near-infrared supercontinuum generation by a nanosecond pulse in a nonlinear fiber amplifier 下载免费PDF全文
Theoretical and experimental research on the effect of initial chirp on near-infrared supercontinuum generation by a nanosecond pulse in a nonlinear fiber amplifier is carded out. The complex Ginzburg-Landau equation is used to simulate the propagation of the pulse in the fiber amplifier and the results show that pulses with negative initial chirp produce the widest supercontinuum and pulses with positive initial chirp produce the narrowest supercontinuum when the central wavelength of the pump lies in the normal dispersion region of the gain fiber. A self-made line width narrowing system is utilized to control the initial chirp of the nanosecond pump pulse and a four-stage master oscillator power amplifier configuration is adopted to produce a high power near-infrared suppercontinuum. The experimental results are in good agreement with simulations which can provide some guidance on further optimization of the system in future work. 相似文献
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基于飞秒锁模固态激光系统,推导了激光脉冲的振幅、脉宽的倒数、啁啾、频率、中心位置和位相的运动方程.在低的白噪声的假设下,估算了含啁啾的钛宝石激光器中由放大的自发辐射引起的时基抖动.结果表明:对于一台脉冲轮廓为sech2(1763t/τ)的确定的锁模固态激光系统,时基抖动近似为净群速延迟色散(GDD)的线性函数,且随着GDD的增加而变大;然而,即便在GDD被完全补偿的情况下,时基抖动也不会是零
关键词:
时基抖时
放大的自发辐射
飞秒锁模固态激光系统 相似文献
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T. Sekikawa T. Ohno T. Yamazaki Y. Nabekawa S. Watanabe 《Applied physics. B, Lasers and optics》2000,70(7):S233-S237
The fifth harmonic pulses of an intense femtosecond Ti:sapphire laser were experimentally shown to be negatively chirped by using an LiF plate as a positive dispersive medium. The chirp of the harmonic pulse originates from the intensity-dependent atomic dipole phase, which is estimated to be proportional to 25 Up, where Up is the ponderomotive energy. Consequently, we have succeeded in compressing the chirped pulses to 13 fs by compensating the intrinsic negative chirp. Chirp effects of the fundamental laser on the pulse width of the fifth harmonic were consistent with the negative chirp of the fifth harmonic. 相似文献