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自启动,长时间稳定,低功率泵浦的超短脉冲掺钛蓝宝石激光器 总被引:2,自引:0,他引:2
接钛蓝宝石晶体具有宽增益带(660~1100um)和大的增益截面(~3×10-19cm2),因此用掺钛蓝宝石激光器极易产生超短脉冲、高功率激光。主动锁模、被动锁模、对撞脉冲锁模、耦合腔锁模(APM)以及同步泵浦锁模的掺钛蓝宝石激光器,都已实现超短脉冲激光输出。更引人瞩目的是在掺钛蓝宝石激光器上采用自锁模技术,来获得超短脉冲激光。自锁模掺钛蓝宝石激光器的结构简单、运行稳定,已被广泛应用。目前国际上自锁模掺钛蓝宝石激光器产生的最短脉冲为8.5fs’‘’,对应的光谱宽度为151urn。掺钛蓝宝石激光器能自锁模产生超短脉冲的机理一… 相似文献
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本文报道了同时采用Fabry-Perot标准具和光栅监测对撞脉冲锁模Nd:YAG激光器输出线宽的初步结果,通过改变泵浦能量获得0.11nm~0.25nm的激光线宽,表明了自相关调制在锁模激光脉冲线宽展宽中起着重要的作用;并对一些相关实验进行了观测。 相似文献
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回顾了短暂时间间隔测量的历史。条纹概念的引入、电光源和电子仪器的使用、激光的出现使能测量到的短暂时间间隔大大缩短。由于对撞脉冲锁模和啁啾脉冲压缩新概念的提出,人们将脉冲宽度压缩到了几个飞秒。介绍了自锁模钛宝石激光器的锁模、放大和调谐的工作原理以及飞秒技术在物理学、生物学、化学控制反应、光通讯等领域中的应用。 相似文献
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研究了用DODCI和DQOCI染料作为可饱和吸收体的对撞脉冲锁模环形染料激光器的运转特性。提供锁模脉冲宽度、激光器以稳定单脉冲工作的稳定性范围和阈值泵浦功率等,对吸收体染料浓度依赖关系的测试结果。表明了用此激光器,在低的泵浦功率(约2W)下,日常能产生脉宽为0.12ps、峰值功率为1kW的稳定脉冲。给出用光谱分辨的二次谐波自相关法测量输出脉冲的结果,证实在锁模脉冲中已发生频率调制。实验中发现用DQOCI染料作为可饱和吸收体时,激光输出光谱由黄光和红光两个分立部分构成。当黄光的振荡被抑制时,锁模稳定性改善且输出脉冲形状整齐、前后沿包含很小的能量。 相似文献
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Few-layer graphitic carbon nitride(g-C_3N_4) nanosheets were fabricated and utilized as a saturable absorber for mode-locking in an Er-doped fiber laser with net normal dispersion. The g-C_3N_4/polyvinyl alcohol(PVA) hybrid-film-based saturable absorber has a modulation depth of 4.01% and a saturation intensity of 7.5 MW/cm~2. By integrating g-C_3N_4-PVA mode-locker into the laser cavity, a mode-locked operation could be obtained. The achieved mode-locking pulse centered at 1530.3 nm has a pulse width of 530 ps. Its repetition rate is 40.8 MHz, and the corresponding signal-to-noise ratio is about 55 dB. 相似文献
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《中国物理快报》2016,(6)
A monolithically active-passive integrated colliding pulse mode-locked semiconductor laser is demonstrated in the InGaAsP/InP material system.The device is mode locked at the second harmonic passive mode-locking regime with a wide mode-locking range.Pulse trains with the repetition rate of 40 GHz,3-dB rf line width of 25 kHz,the pulse width of 2.5ps,and a nearly transform-limited time-bandwidth product of 0.53 are obtained. 相似文献
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分析了带非线性放大光纤环的全光纤激光器的自启动锁模特性,得到了计算该激光器中光脉冲的有效能量增益的理论模型.结果表明,激光器的自启动锁模同掺Er3+光纤的增益及纤芯的有效截面积有关,并计算了自启动锁模的阈值峰值功率大小.应用本文的理论模型能成功地解释观察到的实验现象. 相似文献
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A. K. Komarov 《Optics and Spectroscopy》2005,98(1):120-124
The dependence of the self-start of laser passive mode-locking on the peak intensity of initial pulses under conditions of high-order frequency dispersion of the refractive index is analyzed using numerical simulation and analytical calculations. It is found that frequency dispersion of this type can lead to generation bistability. Specifically, laser passive mode-locking requires the generation of a sufficiently intense seed pulse in the initial noise distribution of the field in the laser cavity; otherwise, no laser passive mode-locking occurs and a steady-state lasing mode with the entire laser cavity filled with radiation is established in the system after the transient process is completed. The revealed threshold dependence of the self-start of laser passive mode-locking on the intensity of the initial seed pulse is one of the possible factors preventing the generation of ultrashort pulses in Kerr-lens lasers. 相似文献
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We demonstrate the experimental observation of different operation states in erbium-doped fiber ring laser with normal cavity
dispersion. The Q-switching, Q-switching mode-locking (QML), continuous wave mode-locking (CML), harmonic mode-locking (HML),
double-pulse and multiple-pulse operation states can be manipulated by only adjusting the polarization controller with the
same pump power. The output spectral bandwidth and pulse width of operation states are measured. The central wavelength dynamics
of different operation states achieved by adjusting the polarization controller are also observed and analyzed. It is shown
that pulse width, polarization, chirp and stability of different operation states are diverse by using nonlinear polarization
rotation technique. 相似文献
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利用化学腐蚀法在光纤包层表面成功制备了调制深度为3.9%的单壁碳纳米管饱和吸收体.组建了环形腔结构的全光纤掺铒光纤激光器,以制备的单壁碳纳米管薄膜为锁模元件,利用倏逝场锁模实现了锁模输出.锁模脉冲的中心波长为1556 nm,3 dB光谱带宽为24 nm,脉冲宽度为147 fs,重复频率为150 MHz.在520mW抽运功率下,平均输出功率为21 mW,相应的单脉冲能量为0.14 nJ. 相似文献
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In this paper, we report on the generation and the stabilization of ultrafast optical pulse trains exceeding 100 GHz from monolithic mode-locked laser diodes (MLLDs) combined with some new techniques such as subharmonic synchronous mode-locking (SSML) and repetition-frequency multiplication (RFM) method. Key subjects to increase the pulse repetition frequencies of the MLLDs such as fast absorption recovery and harmonic mode-locking operation are discussed. 500 GHz optical pulse generation from a short-cavity, graded-index separated confinement heterostructure MLLD and THz-rate pulse generation by harmonic mode-locking are reported. We also demonstrate the stabilization of a 160 GHz MLLD by the SSML with subharmonic-frequency optical pulse injection and reveal that the SSML is very promising as a stabilization technique of the ultrafast MLLD beyond the limitations by the electronic device speed. A method to accurately measure the timing jitter of such ultrafast optical pulse train, all-optical down converting using a nonlinear optical device, is also presented. We also mention another choice for ultrafast optical pulse generation using the MLLD combined with a dispersive medium such as an optical fiber. We demonstrate here the generations of stable 84–256 GHz optical pulse trains by the RFM method of the MLLD stabilized by the SSML. 相似文献
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Mode-locked diode-pumped solid state lasers have become important sources for efficient and reliable short pulse generation. We review techniques for active mode-locking of diode-pumped lasers, highlighting techniques which have produced much shorter pulse durations than previous technologies and extended operating repetition rates to the several gigahertz regime. To achieve even shorter pulse durations a series of nonlinear passive mode-locking techniques have been developed. Self-starting additive pulse mode-locking, resonant passive mode-locking and self-mode-locking of diode-pumped solid-state lasers are described. 相似文献