共查询到20条相似文献,搜索用时 140 毫秒
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通过研究发现双包层结构能降低石英基光子晶体光纤损耗,并制备一种高非线性双包层结构石英基光子晶体光纤来进行实验研究.使用钛宝石飞秒激光器将实验室自制的石英基光子晶体光纤在反常色散区泵浦,研究不同的泵浦功率和泵浦波长对中红外超短脉冲孤子的影响,并分析了石英基高非线性光子晶体光纤中红外超短脉冲孤子产生的物理机理.结合实验发现在泵浦功率为827 nm,功率从0.1 W增加到0.42 W时,中红外第一个孤子随功率增加从1933 nm移动到2403 nm,可调范围达到470 nm,为石英基光子晶体光纤产生宽带可调超短脉冲源创造了很好的条件. 相似文献
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赵伯林 《激光与光电子学进展》1982,19(6):17
最近,以产生稳定可调谐超短光脉冲列为目的,正在活跃地开展锁模连续波染料激光器的研究工作。但是,其波长范围只限于可见光区,在考虑超短光脉冲列的应用时,把波长范围扩展到波长更短的紫外区这一问题,可以说是重要的研究课题之一。 相似文献
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为了研究全光波长转换的实现方法,采用色散位移光纤中脉冲光和连续波间的交叉相位调制效应,使得连续波产生频移和展宽,然后利用光纤光栅滤波,得到了重复频率为57.97MHz、脉冲宽度为2ns的转换脉冲,这与抽运脉冲重复频率、脉冲宽度基本相同,而且连续波可调范围是1537nm~1560nm。结果表明,基于色散位移光纤中交叉相位调制效应的波长转换具有较宽的波长转换范围和较快的转换速度,是一种简单、高效和通用的波长转换技术。 相似文献
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文章研究了构成光纤环的色散渐减光纤三阶色散分别为正、负以及忽略三阶色散情况
下,超短脉冲在光纤环中的传输特性,通过比较发现脉冲内拉曼散射与负的三阶色散相互作用更有利于飞秒脉冲的传输与压缩,从而使飞秒光脉冲在环形腔中的传输特性得到极大改善。 相似文献
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光子晶体光纤中高阶色散和非线性对压缩脉冲对的影响 总被引:1,自引:0,他引:1
数值模拟了光子晶体光纤中波长位于反常色散区的高阶孤子泵浦脉冲与波长在正常色散区的信号脉冲通过交叉相位调制作用,产生的压缩脉冲对.首先讨论了在高阶色散影响下,飞秒脉冲基于交叉相位作用,弱脉冲产生的压缩脉冲对不再保持对称不变,产生蓝移.此外,考虑高阶非线性效应的影响,飞秒信号脉冲从正常色散区频移到反常色散区,产生的压缩脉冲由两个演变成一个,受拉曼红移影响较大,同时脉冲的峰值功率显著增加. 相似文献
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将钛宝石激光器产生的飞秒激光脉冲泵浦实验室自制的高非线性双折射光子晶体光纤,脉冲的中心波长为820 nm,位于光子晶体光纤的接近于零色散的反常色散区.实验结果表明:随着泵浦功率的增加,一阶孤子的中心波长发生了红移,同时产生的色散波的中心波长则发生蓝移进入可见光区.当泵浦功率达到0.45 W时,色散波与残余泵浦的输出功率比为42.67,色散波的带宽达到81 nm,而处于近红外波段的红移孤子带宽可达231 nm.利用高非线性光子晶体光纤产生近红外波段宽带孤子和可见区高效色敬波的实验对飞秒激光频率转换和光谱展宽具有很好的借鉴意义. 相似文献
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Wen Hua Cao Kam-Tai Chan 《Quantum Electronics, IEEE Journal of》2001,37(5):725-732
A simple technique for the simultaneous generation of bright and dark soliton trains from continuous-wave (CW) light is proposed and demonstrated theoretically. It is based on the optical switching characteristics of a nonlinear-optical loop mirror (NOLM) through which the CW signal is switched by a pump pulse train at another wavelength by the creation of cross-phase modulation-induced phase bias between the counter-propagating CW components. The transmitted and reflected signals exiting from the NOLM can then evolve, respectively, into bright and dark soliton trains in fibers with the appropriate group-velocity dispersion at the signal wavelength. Numerical simulations indicate that the generated solitons can be narrower than the pump pulses and that the scheme permits the conversion of nearly all of the CW energy into the soliton train energy without generating pulse pedestals 相似文献
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提出并实验探究了基于同步脉冲诱导的中红外差频产生技术,利用高速光电探测器将泵浦光脉冲转换为超短电信号,使其驱动宽带的幅度调制器,作用于可调谐连续激光器上,从而实现双色脉冲的稳定时域同步。利用了同步脉冲诱导的非线性差频过程,有效降低了光参量下转换的泵浦阈值,能够获得瓦量级的中红外超短脉冲输出,最大泵浦光转换效率达60%,且中心波长在3000~3175 nm范围内可调谐。得益于全保偏光纤架构,平均功率的不稳定度(STD/MEAN)在1 h内低至0.07%,展现了优异的长期稳定性。此外,该方案利用光-电-光高速调制实现高精度脉冲同步,免除了复杂的反馈电路,具有结构简单、即插即用、鲁棒性强的特点,为拓展中红外光源在野外的应用奠定了基础。 相似文献
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飞秒光参量放大技术是一种获得宽带飞秒脉冲的有效手段.首先介绍了飞秒光参量放大技术的基本原理,并通过数值模拟显示了群速度失配及位相失配对信号转换过程的影响.数值计算结果表明:群速度失配及位相失配会导致转换效率下降,群速度失配还会导致脉冲发生畸变.其次,综述了该技术在超短脉冲特别是周期量级脉冲产生方面的研究进展,并介绍了Baltuska等设计的可以产生3.9 fs脉冲的非共线光参量放大装置.其中,详细讨论了超连续白光注入源、泵浦光角色散以及晶体选择三方面内容.最后介绍了该技术在高能飞秒脉冲产生方面取得的最新研究进展. 相似文献
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AlGaAs DH lasers with strong RF modulation superimposed on the relatively low dc bias below the oscillation threshold were demonstrated to be feasible for generation of a train of approximately 30 ps optical pulses at a repetitive frequency of sub-GHz range. The pulse envelope width was measured by three different methods: a fast response photodetector, the second-harmonic generation (SHG) correlation method, and an ultrafast streak camera. The results of the SHG correlation and the streak camera agreed fairly well. In order to explain the generation mechanism and the characteristics of these ultrashort optical pulses in a highly RF modulated semiconductor diode laser, the rate equation analysis was performed and the results were generally in good agreement with the experiment. Furthermore, from the computer simulation for the analysis of the SHG correlation traces, it was inferred that an individual ultrashort optical pulse has internal substructures made of fluctuating fields whose spike widths were of the order of subpicoseconds, due to the randomness of the phases among lasing modes. 相似文献
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Razzari L. Liberale C. Cristiani I. Tediosi R. Degiorgio V. 《Quantum Electronics, IEEE Journal of》2003,39(11):1486-1491
An optical wavelength converter based on second-order cascaded interactions in a waveguide is presented. The conversion mechanism relies on the combination of amplification and nonlinear dephasing of a signal field in the presence of a strong pump field at the phase-matching wavelength for second-harmonic generation. The considered scheme of the device is that of a Mach-Zehnder interferometer. The performance is numerically evaluated in the pulsed regime. A wide conversion bandwidth and high conversion efficiency is found. An operating regime can be found in which a significant reshaping of the output pulses, with respect to input pulses, can be observed. 相似文献
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Masao Kato 《Lightwave Technology, Journal of》2006,24(2):805-809
Wavelength-tunable multicolor optical pulse generation based on the self-frequency shift of a Raman soliton was demonstrated. An ellipse polarized pump source, a highly birefringent (HB) optical fiber, and a highly nonlinear dispersion-shifted fiber were used to generate Raman soliton pulses. The wavelength was tuned by controlling the polarization of the pump source. Raman soliton pulses with six different colors and low wavelength crosstalk under 20 dB have been successfully generated. 相似文献