共查询到20条相似文献,搜索用时 15 毫秒
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The spatial chirp generated in the Ti:sapphire multipass amplifier is numerically investigated based on the onedimensional(1D) and two-dimensional(2D) Frantz–Nodvik equations. The simulation indicates that the spatial chirp is induced by the spatially inhomogeneous gain, and it can be almost eliminated by utilization of proper beam profiles and spot sizes of the signal and pump pulses, for example, the pump pulse has a top-hatted beam profile and the signal pulse has a super-Gaussian beam profile with a relatively larger spot size. In this way, a clear understanding of spatial chirp mechanisms in the Ti:sapphire multipass amplifier is proposed, therefore we can effectively almost eliminate the spatial chirp and improve the beam quality of a high-power Ti:sapphire chirped pulse amplifier system. 相似文献
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ZHU Xiaolei XU Shixiang LIU Yupu SHEN Xiaohua ZHANG Yinghua WANG Liushui LIN Zunqi 《Chinese Journal of Lasers》1998,7(4):298-302
The design and performance of a Ti:sapphire regenerative amplifier operating at 1. 056 μm are described. A laser pulse with an initial pulsewidth of 100 fs is amplified to ≥1.5 mJ in the amplifier after firstly stretched to 850 ps. The amplified pulse can be re-compressed to ~300 fs with energy of ~1 mJ. Loss of the spectrum happens in the regenerative cavity since bandwidth of the coat of optics in the cavity is not enough adequate. 相似文献
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According to laser beam transporting in a multipass Ti:sapphire amplifier based on a parabolic mirror, the influential factors to induce astigmatism are analyzed. The beam waists of the laser beam transporting in the multipass amplifier are calculated by ABCD law in sagittal and tangential planes, respectively, and are compared with each other. Our analyses of these influential factors provide valuable data to optimize this design of multipass Ti:sapphire amplifier, and our experimental results of getting Gaussian beam from such a kind of amplifier confirmed our theoretical analyses. 相似文献
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Jin Woo YoonSeong Ku Lee Tae Jun YuJae Hee Sung Tae Moon JeongJongmin Lee 《Current Applied Physics》2012,12(3):648-653
We design a two-stage non-collinear optical parametric chirped pulse amplifier using BBO crystals for a high-power Ti:sapphire laser system, and numerically analyze the output characteristics of the OPCPA system. We find optimal phase-matching conditions and calculate the parametric gains as a function of pump intensity and interaction length. By constructing a two-stage OPCPA system using two BBO crystals, we obtain 12 mJ output energy corresponding to a high gain of 107, a pulse duration of 37 fs, and a contrast ratio of 5×10−8. 相似文献
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要建造大功率超强激光系统,必须将nJ量级的种子进行放大,以得到mJ量级以及更高能量的激光输出.为达到这个目的,必须使种子能量指数增加,再生腔放大器是实现这一目的的良好途径;同时,为了得到更稳定的激光输出,须采用高重复频率的泵浦源.为此,设计了一种kHz重复频率激光泵浦的再生放大器,使用15 mJ的527 nm的绿光泵浦,得到了约2.3 mJ的800 nm放大激光输出,同时,对其输出激光的光谱特性进行了测量,将带宽为40 nm的种子注入后,得到了光谱带宽约为30 nm激光输出. 相似文献
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Birefringent plate design for broadband spectral shaping in a Ti:sapphire regenerative amplifier 总被引:1,自引:0,他引:1
Xiaoming Lu Chuang Li Yuxin Leng Cheng Wang Chunmei Zhang Xiaoyan Liang Ruxin Li Zhizhan Xu 《中国光学快报(英文版)》2007,5(8)
A method to design a birefringent plate (BP) for broadening spectrum in a regenerative amplifier is presented. Using this method, we design a quartz BP with thickness of 761μm inserted into a Ti:sapphire regenerative amplifier. The gain narrowing effect is reduced efficiently, and the experimental results agree with the calculation well. The bandwidth is broadened from 28 to 62 nm using the designed quartz BP and the pulses are compressed to ~ 23 fs. 相似文献
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讨论钛宝石再生放大器工作在1056nm波长时,获得稳定输出的条件,并在实验上成功地演示了稳定的放大脉冲输出,输出能量均方根起伏小于5%。 相似文献
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采用环形再生腔结构的啁啾脉冲放大技术方案, 在重复频率100 Hz,单脉冲能量33.1 mJ的532 nm激光抽运下, 从钛宝石激光中获得了单脉冲能量9.84 mJ的放大输出, 对应的斜效率达33.1%.在重复频率10 Hz的情况下, 同样获得了单脉冲能量为9.64 mJ, 对应斜效率达36.8%的高效率放大结果. 通过色散补偿压缩该啁啾激光脉冲后的单脉冲能量为6.36 mJ, 脉冲宽度为59.7 fs. 测量结果表明典型的能量不稳定度为1.85%.
关键词:
啁啾脉冲放大
再生放大
飞秒激光
环形腔 相似文献
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在常规重复频率77 MHz掺钛蓝宝石飞秒激光器的基础上,通过腔内引入Herriott型多通望远镜系统增加总腔长及对腔内色散的深入分析和实验控制,实现了低重复频率、高脉冲能量飞秒激光振荡的稳定运行.在连续功率8.2 W的532 nm激光抽运下,得到了重复频率11 MHz、单脉冲能量达72.73 nJ、对应峰值功率MW量级的结果.相对80 MHz重复频率下6.25 nJ的单脉冲能量及150 kW的峰值功率,其输出能力提高了约一个量级.
关键词:
飞秒激光
掺钛蓝宝石激光器
低重复频率
MW 相似文献
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l.IntroductionItiswe1lknownthatthetemperaturcofaso1id-statelasermediawillgethighwhenitispumPedbyflash-lamporlaser,x`hichwi1l1eadtohigheroscillationthersholdandlowerefficiency.Duetotheinhomogeneouspumpandtheinhomogeneouscool,thetem-Peraturedistributioninthemediabecomesinhomogeneoussothattherefractiveindexofthemediachangesinhomogeneouslyandtheheatlenseffectwillbegenerated,whichwillaffectontheosci11ationthreshold,efficiency,andotherlaserparameters.Itisessentia]andimportanttoknowthetemPeraturedis… 相似文献
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RepetitionOperationofFlashlampPumpedTi:sapphireLaser¥LIZiyao;GAOGuochang;YINShaotang(AnhuiInstituteofOpticsandFineMechanics,C... 相似文献
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Lihuang Lin Bing Xu Xiaodong Yang Chuandong LiBin Ouyang Runwen Wang 《Chinese Journal of Lasers》1993,2(4):295-298
A Ti: sapphire laser pumped synchronously by a bounded frequency-doubled pulse train of a pulsed mode-locked Nd : YAG laser was presented. The temporal characteristics of the laser and optimal conditions of generating stable ultrashort pulses are also given. 相似文献
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Qinghong Zhou 《Optics Communications》2011,284(18):4207-4214
With the FEA and matrix methods, the thermal lenses induced by the thermooptic effect, thermally induced mechanical strain and end face bulging in a Ti:sapphire crystal are analyzed. The results show that there is an unignorable strain-induced lens in a high pump power region. With the thermal lens effect, an injection-locked cw Ti:sapphire laser is numerically simulated. We find that the poor mode matching between the lasing and pump beams due to thermal lens will cause the slope efficiency decreasing. The calculated results agree with the reported experimental data, and we also predict that the thermal lens is obviously active at a certain pump power level. 相似文献