共查询到17条相似文献,搜索用时 62 毫秒
1.
2.
3.
以不同滤波器带宽下获得的全正色散光纤激光器耗散孤子作为啁啾脉冲放大(CPA)系统的种子脉冲, 研究了光栅对和光纤展宽器CPA系统输出脉冲的可压缩性. 结果表明, 对于大能量耗散孤子种子脉冲, 当CPA系统采用正色散光纤展宽器时, 光纤群速色散与自相位调制之间的相互作用不仅可抑制耗散孤子脉冲光谱调制的影响, 还可使脉冲在光纤展宽器中自相似演化, 从而可提高CPA输出脉冲的可压缩性. 通过优化光纤展宽器长度, 对于耗散孤子种子源, 采用光纤展宽器的CPA系统输出脉冲可压缩性与主脉冲所占脉冲总能量之比均优于采用光栅对展宽器时的情况. 相似文献
4.
在啁啾脉冲放大(CPA)系统中, 脉冲的展宽是实现安全有效放大的重要保证. 本文介绍了一种新型的由色散棱镜与光栅组合而成的反射式棱栅对展宽器. 并利用光线追迹法对色散进行了数值模拟, 测量实验结果验证了理论计算的正确性. 在此基础上, 分析了以棱栅对为展宽器和ZF7玻璃材料为压缩器的下啁啾(down-chirped)脉冲放大系统中的色散比较传统的上啁啾脉冲放大系统, 结果表明棱栅对可以同时提供负的二阶色散和三阶色散, 这样能更好地补偿放大器中材料的高阶色散, 从而获得近傅里叶变换极限的压缩脉冲. 此外以块材料作为压缩器不仅提高了传输效率, 而且简化了实验装置, 增强了系统的稳定性. 这样的展宽压缩组合在高重复频率的飞秒啁啾脉冲放大系统中具有明显优势.
关键词:
反射式棱栅对
啁啾脉冲放大
色散
飞秒脉冲 相似文献
5.
6.
啁啾高斯脉冲通过增益色散介质的传输特性 总被引:1,自引:1,他引:0
采用复数波数定义和衍射积分方法,研究了啁啾高斯脉冲在增益色散介质中的传输特性,给出了介质增益谱为洛仑兹分布时的频谱分布以及时空分布的传输解析公式,详细分析了传输过程中光场的频谱和时空分布、脉宽和频谱变化以及谱移等特性。结果表明,啁啾高斯光束在介质中传输时其时间波形仍保持高斯分布不变,但在传输过程中其脉宽会发生变化。在传输过程中,啁啾参量会影响谱宽的减小程度以及谱移的幅度。啁啾参量越大,脉宽展宽和谱宽压窄的效果越明显,同时,随着传输距离的增大,光谱谱移也越明显。对于给定的啁啾参量,随着传输距离的增大,谱移将最终趋于一恒定值。 相似文献
7.
8.
在数太瓦钛宝石啁啾脉冲放大系统中(极光Ⅱ升级装置),对多脉冲序列的放大过程进行了详细的实验研究,获得了多脉冲序列的放大输出.每一个放大脉冲串中包含有19个独立的飞秒单脉冲,其相邻间隔为14.8 ns,对应的重复频率为67.5 MHz.脉冲串的总能量约为122 mJ,各单脉冲能量从20 mJ指数衰减至0.5 mJ,脉宽约为60fs,对应的峰值功率约为1011—1010W.这种脉冲序列在产生长寿命激光等离子体、激光微加工等方面有重要应用前景. 相似文献
9.
10.
11.
We derive an analytical expression for the expected root-mean-square (rms) pulse broadening with considering the combined effects of all-order polarization mode dispersion (PMD), group velocity dispersion (GVD) and frequency chirp. It is shown that two commonly used first-order PMD compensators lose their efficiency quickly with chirp parameter increasing if GVD is ignored. When GVD is added, prechirp technique is helpful for the enhancement of PMD tolerance for both uncompensated case and first-order compensators when GVD and PMD coefficient satisfy some special relationship. 相似文献
12.
Zhenhong Sun Lu Chai Zhigang Zhang Chingyue Wang Weili Zhang Xudong Xie Xiaojun Huang Xiaodong Yuan 《Optics & Laser Technology》2007,39(1):29-33
In this paper, based on ray tracing, the approach of mutual compensation that introduced properly the negative third-order dispersion to balance the higher-order dispersion in the chirped pulse amplification (CPA) system with regenerative amplifier is presented. A shorter pulse with near-transform-limitation can be generated by this method than by the conventional approach that zeros the second- and the third-order dispersion successively in the CPA system. 相似文献
13.
14.
High-dispersive mirror for pulse stretcher in femtosecond fiber laser amplification system
下载免费PDF全文
![点击此处可从《中国物理 B》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Wenjia Yuan 《中国物理 B》2022,31(8):87801-087801
We present a high-dispersive multilayer mirror for pulse stretching in a femtosecond fiber laser amplification system. The designed mirror contains 54 layers with a total physical thickness of 7.3 μm, which can provide a positive group delay dispersion (GDD) of 600 fs2 and a high reflectance over 99.9% from 1010 to 1070 nm. The samples were prepared by dual ion beam sputtering. The measured transmittance matches well with the theoretical result. The GDD characteristics of samples were tested by home-made white light interferometer. The measured GDD is higher than the design results, an average GDD of +722 fs2 from 1010 nm to 1070 nm. The mirrors were employed in a Yb-doped large-mode-area photonic crystal fiber amplification system. An input pulse compressed by the gratings with autocorrelation function of 83 fs is obtained with a stretched FWHM of 1.29 ps after 28 bounces between the dispersive mirrors. The results show that the multilayer dispersive mirror could be an effective and promising technique for pulse stretching in femtosecond amplification systems. 相似文献
15.
Effects of pulse chirp on supercontinuum produced in dispersion decreasing fibre 总被引:1,自引:0,他引:1
下载免费PDF全文
![点击此处可从《中国物理》网站下载免费的PDF全文](/ch/ext_images/free.gif)
The supercontinuum (SC) source plays a key role in wavelength division multiplexing over the optical time division multiplexing (WDM/OTDM) transmission system. The SC produced in dispersion decreasing fibre (DDF) is wider and flatter than that produced in dispersion shifted fibre (DSF). In this paper, a SC producing process in DDF is numerically simulated, the effects of pump pulse chirp on the SC width and flatness are initially studied and the corresponding theoretical explanations are given. Particularly, we have analysed and compared the evolutions of the SC along DDF pumped by different chirp pulses. Several valuable conclusions are obtained. 相似文献
16.