共查询到20条相似文献,搜索用时 15 毫秒
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钛宝石激光器中用优化Gires-Tournois镜产生15 fs脉冲 总被引:4,自引:0,他引:4
根据飞秒脉冲锁模钛宝石激光器脉冲压缩的要求,介绍了负色散镜补偿色散的基本原理及其特点。详细阐述了优化Gires-Tournois(OG-T)镜的设计过程,并通过计算机优化得到理想设计膜系。采用离子束溅射的方法镀制了优化Gires—Tournois镜。测量了优化Gires-Tournois镜(编号为OGT#1)的透射率和群延迟色散,并与设计值进行了比较,分析了实测值产生偏差的原因,从而对镀膜参量进行了相应的调整,制造了第二批优化Gires—Tournois镜(编号为OGT#2)。将优化Gires—Tournois镜用于钛宝石激光器振荡级内,单程5次通过三个优化Gires-Tournois镜,补偿了激光器腔内色散,实现了飞秒锁模脉冲运转。用OGT#1先进行了实验,获得32fs的脉冲和46nin的光谱宽度。用调整参量后的OGT#2进行了实验,获得了15fs的超短脉冲和91nm的光谱宽度。实验很好的验证了负色散镜补偿色散的优点,为国内啁啾镜的研制创造了条件。 相似文献
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We demonstrated the generation and characterization of 9.7 fs, 180 J pulses centered at 385 nm via the frequency doubling of few-cycle near-infrared pulses. Both moderate conversion efficiency(9.5%) and broad phase matching bandwidth(20 nm) were achieved by shaping the spectra of the fundamental pulses. The strong intensity dependence of second-order harmonic generation and well controlled material dispersion ensured the inexistence of satellite pulses, which was confirmed by the self-diffractio... 相似文献
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OPA泵浦保偏光子晶体光纤产生超连续谱和非线性特性的研究 总被引:4,自引:8,他引:4
采用波长可调光参量放大器作为泵浦源,对保偏光子晶体光纤的超连续谱的产生和非线性特性进行了实验研究.将光参量放大器产生的中心波长为1.27 μm,脉宽约为250 fs,重复频率为250 kHz和单脉冲能量只有92 nJ的光脉冲耦合进0.2 m长的保偏光子晶体光纤,实验中观察到了光谱展宽和非线性效应,在1.3 μm 波长区域获得了谱宽为83 nm (1.2486 ~1.3318 μm)的超连续谱. 相似文献
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LI Yuhua LOU Caiyun WU Jian WU Boyu GAO Yizhi 《Chinese Journal of Lasers》1998,7(4):303-307
1IntroductionHighspedandlargecapacityaretheevidentfeaturesoftheinternationalopticalcommunicationresearch.However,thehighestb... 相似文献
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High-Repetition-Rate and High-Beam-Quality Laser Pulses with 1.5 MW Peak Power Generation from a Two-Stage Nd:YVO_4 Amplifier 下载免费PDF全文
We develop a two-stage end-pumped Nd:YVO_4 amplifier seeded by a passively Q-switched microchip laser. An average output power of 13.5 W with repetition rate up to 7 kHz and pulse duration of ~1.24 ns is obtained,corresponding to a pump extraction efficiency of 16.1%(19.5% for the second stage) and peak power of ~1.5 MW.The beam quality factors at maximum output power are measured to be M_x~2= 1.56 and M_y~2= 1.48. We introduce an analytical model to estimate gain and beam quality after amplification. This model focuses on the influence of ratio of seed spot radius to pump spot radius when designing an amplifier. Moreover, our experiments reveal that the re-imaging system in the double-pass configuration can be used to enhance the beam quality. 相似文献
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High Power Er/Yb Codoped Double Clad Fiber Pulsed Amplifier Based on an All-Fiber Configuration 下载免费PDF全文
We report an all-fiber two-stage high power pulsed amplifier, seeded with a 1550nm, 1 kHz repetition rate rectangular pulse, and based on Er/Yb co-doped double clad fiber. All the characteristics are measured in the experiment. The maximal slope efficiency is 22.56%, which is the highest we know of at such a low repetition rate, and the maximal output signal power is 1W. The various factors that affect the pulsed amplifier performance are analyzed. A high output power while keeping high power conversion efficiency can be obtained with careful selection of the input power, pump power and repetition rate. The experimental results show that the crucial parameters should be optimized when designing all-fiber pulsed amplifiers. 相似文献
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以非线性薛定谔方程为模型,采用分步傅里叶方法对光纤放大器中自相似脉冲的传输特性进行详细的研究,结果表明:抛物型的自相似脉冲可以在不包含高阶色散的光纤放大器系统中稳定传输;当系统的高阶色散(如:三阶色散)不容忽略时,自相似脉冲在光纤放大器中传输时将在脉冲沿出现抖动现象,导致脉冲的抛物线形状产生畸变. 相似文献
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用于光孤子通信的理想分布式放大器 总被引:1,自引:0,他引:1
光孤子通讯的一个重要的问题是如何提高光孤子通讯的站间距离,降低线路成本,本文从降低信号在线路中的起伏入手,通过理论分析和计算机模拟,提出了用于孤子通讯的理想分布式光纤放大器的设想,借以降低噪声和提高泵浦站间距,降低线路成本,并对一些设计参数对系统的影响进行了讨论。 相似文献
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We show both numerically and experimentally that through appropriately selecting the output coupling position and strength in a mode-locked fiber laser, one can effectively manage the nonlinearity of the cavity. By implementing the technique together with cavity dispersion management in an erbium-doped fiber laser, we have achieved stable mode-locked pulses with a single-pulse energy of 2.08 nJ and pulse width of 46.2 fs directly from the laser. 相似文献
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《中国光学快报(英文版)》2018,(11)
44.6 fs pulses from a 257 MHz, mode-locked non-polarization maintaining Er-doped fiber laser based on a biased nonlinear amplifying loop mirror are reported. The output power is 104 mW and the single-pulse energy is 0.4 nJ.The minimum pulse duration of the direct output is 44.6 fs, which is the shortest in this kind of laser. 相似文献
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We report the generation of optical pulses with an energy of 0. 55 m^3 and duration of 1.6-cycle (4.4 fs) at repetition rate of 1 kHz using a differentially pumped hollow fiber and chirped mirrors. Compared to the statically gasfilled scheme, the differentially pumping hollow fiber is demonstrated to support more energy output with higher transmission efficiency, and to increase the spectral broadening due to a reduction of ionization defocusing in plasma at the fiber entrance. The differentially pumping technique is proved to be an effective way to obtain optical pulses with mono-cycle and higher energy. 相似文献
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基于描述脉冲放大过程的时间相关非线性辐射迁移方程,对不同形状脉冲经掺镱光纤放大器传输后的功率特性进行了分析,该方程同时考虑了光与介质的相互作用.数值结果表明,在相同的脉冲能量下,不同形状脉冲经放大器放大后的功率增益随入射脉冲形状不同而不同,并且功率增益的差异在脉冲前沿比较大.这使得放大器输出脉冲峰值向前沿的偏移量以及峰值功率的放大倍数都与脉冲形状有关.尤其是当入射脉冲的能量较大时,不同形状脉冲的峰值功率的放大倍数明显不同,以超高斯脉冲为最大,高斯脉冲、双曲正割脉冲次之,洛伦兹脉冲最小. 相似文献
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Ultrashort high-energy electron beams are generated by focusing fs Ti:sapphire laser pulses on a thin metal tape at normal incidence. At laser intensities above 1016 W/cm2 , the fs laser plasma ejects copious amounts of electrons in a direction parallel to the target surface. These electrons are directly detected by means of a backside illuminated X-ray CCD, and their energy spectrum is determined with an electrostatic analyzer. The electrons were observed for two laser polarization directions, parallel and perpendicular to the observation direction. At the maximum applied intensity of 2×1017 W/cm2, the energy distribution peaks at around 35 keV with a hot tail detectable up to about 300 keV. The number of electrons per shot at 35 keV is about 5×108 per sterad per keV. Quasi-monoenergetic electron pulses with a relative energy spread of 1% were produced by using a 50-m slit in the beam path after the analyzer. This approach offers great potential for time-resolved studies of plasma, liquid, and surface structures with atomic-scale spatial resolution. PACS 41.75.Fr; 52.38.Kd; 52.70.Nc 相似文献