共查询到19条相似文献,搜索用时 140 毫秒
1.
根据钛宝石激光器的要求,实验设计了中心波长800 nm带宽200 nm的啁啾镜,在700—900 nm波长范围内提供约-60 fs2群延迟色散(group delay dispersion,GDD).采用双射频离子束溅射方法进行制备,用实验室搭建的白光干涉仪进行色散性能测试,从测试结果可以看出,制备的啁啾镜的性能和设计值符合得比较好.制备得到的非成对啁啾镜在钛宝石激光谐振腔中进行色散补偿,锁模后分别获得了12 fs和9.5 fs的激光脉冲输出.这是目前报道的使用国产啁啾镜获得的最短的
关键词:
啁啾镜
群延迟色散
色散补偿
钛宝石激光器 相似文献
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通过在钛宝石激光腔内引入望远镜长腔系统增加腔长,实现了重复频率低到10?MHz的飞秒激光振荡,在5?W的抽运功率下获得了平均输出功率200?mW、单脉冲能量20?nJ的稳定输出. 在此基础上分析了腔内不同色散情况下的输出脉冲光谱和脉宽特性,结果表明在腔内存在一定负色散的情况下,锁模脉宽可接近转换极限,最短脉宽可达56?fs. 而在正色散的情况下,锁模输出的脉宽较宽,并且随着腔内正色散的增多,脉宽可到大于600?fs,锁模光谱也呈马鞍形.
关键词:
钛宝石激光器
飞秒脉冲
低重复频率
望远镜腔 相似文献
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本文报道了采用基于熔石英薄片超连续的少周期飞秒光源驱动高次谐波产生的实验研究.实验中通过将重复频率1kHz的飞秒钛宝石激光放大器所输出的能量0.8mJ、脉宽30fs的脉冲聚焦到7片0.1mm厚的熔融石英片中,得到了覆盖带宽大于倍频程的展宽光谱.利用啁啾镜补偿色散后,经瞬态光栅频率分辨光学开关法测得脉宽为6.3fs,对应约2.3个光学周期.利用压缩后的激光脉冲聚焦作用于惰性气体,并通过调节尖劈插入量改变脉宽,分别测得了分立以及连续的高次谐波截止区信号,结果与6.3fs的脉冲宽度相符合. 相似文献
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设计了中心波长800 nm带宽约500 nm的啁啾镜对, 在550–1050 nm波长范围内提供约-60 fs2群延迟色散(group delay dispersion, GDD), 通过啁啾镜对的形式使GDD振荡波纹由单个啁啾镜的±100 fs2减小到±20 fs2. 采用双射频离子束溅射方法进行制备, 用白光干涉仪进行色散性能测试, 从测试结果可以看出, 制备的啁啾镜的反射率、GDD性能和设计值符合得比较好. 制备出的550–1050 nm超宽带啁啾镜对在钛宝石激光器腔外进行色散补偿, 原输入脉冲由24–27 fs压缩到12 fs, 这是国产超宽带啁啾镜对的首次应用.
关键词:
超快激光
啁啾镜对
群延迟色散
色散补偿 相似文献
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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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构建了掺镱大模场面积单偏振光子晶体光纤飞秒激光非线性放大系统. 讨论了腔内净色散量和抽运功率对振荡级输出参数的影响和振荡级参数对放大级输出参数的影响. 在本实验条件下, 当腔内净色散量取较大负色散时, 振荡级直接输出的脉冲更宽, 且携带更少的啁啾. 当振荡级抽运4.53 W时, 选择最接近变换极限的脉冲作为种子脉冲, 放大级在60 W抽运时输出压缩后无基底的短脉冲, 宽度为45.7 fs, 平均功率28 W. 振荡级抽运功率增加到5.08 W, 放大级抽运70 W时, 获得最高输出功率34.5 W, 对应脉宽53.5 fs. 相似文献
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Lucca A Debourg G Jacquemet M Druon F Balembois F Georges P Camy P Doualan JL Moncorgé R 《Optics letters》2004,29(23):2767-2769
We report what is believed to be the first demonstration of a high-power passively mode-locked diode-pumped femtosecond laser based on an Yb3+:CaF2 single crystal, directly pumped by a 15-W fiber-coupled laser diode. With a 5-at. % Yb3+ -doped sample and prisms for dispersion compensation we obtained pulses as short as 150 fs, with 880 mW of average power and up to 1.4-W average output power, with a pulse duration of 220 fs, centered at 1049 nm. The laser wavelength could be tuned from 1040 to 1053 nm in the femtosecond regime. Using chirped mirrors for dispersion compensation, the oscillator provided up to 1.74 W of average power, with a pulse duration of 230 fs, corresponding to a pulse energy of 20 nJ and a peak power of 85 kW. 相似文献
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DA Gaponov LV Kotov ME Likhachev MM Bubnov A Cabasse JL Oudar S Fevrier DS Lipatov NN Vechkanov AN Guryanov G Martel 《Optics letters》2012,37(15):3186-3188
Direct amplification of output from chirped pulse oscillator (CPO) to 3.3?W of average power (pulse energy of 118?nJ in 20?ps pulse duration before compression) was achieved in a properly designed cladding pumped large mode area Er-doped fiber. Various configurations of CPO cavity with different FWHM of output spectrum and pulse duration were investigated. Fourier limit compression with 480?fs pulse duration and 32?kW peak power has been obtained for pulses with 14.8?nm FWHM spectrum. Subsequent nonlinear compression in a standard SMF-28 fiber yielded pulses as short as 145?fs. 相似文献
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Using noble gases as a nonlinear medium, it has become possible to compress energetic laser pulses into the sub-10-fs regime.
Hollow fiber capillaries can serve to increase the effective interaction length of the pulses, and impressive white-light
continua have been reported as a result. With demonstrated bandwidths exceeding the optical octave, this method holds the
potential for generating single-cycle optical pulses. On the practical side, however, it becomes very difficult to compensate
for dispersive effects and to fully exploit the enormous bandwidth. We will discuss chirped mirrors as one means for pulse
compression. A further challenge lies on the characterization side. Utilizing advanced characterization schemes, we were able
to demonstrate compression of a white-light continuum down to a pulse duration of 3.8 fs, which corresponds to only about
1.6 cycles at the carrier wavelength. These are the shortest pulses in the visible/near-infrared wavelength range that have
ever been produced with a non-adaptive approach to dispersion compensation. Moreover, these are the shortest pulses generated
using chirped mirrors, which compares favorably to previous results that were achieved with much more elaborate and lossier
adaptive compression schemes.
PACS 42.65.Re; 42.65.Wi 相似文献
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O Pronin J Brons C Grasse V Pervak G Boehm MC Amann A Apolonski VL Kalashnikov F Krausz 《Optics letters》2012,37(17):3543-3545
We demonstrate a self-starting Kerr-lens mode-locked (KLM) Yb:YAG thin-disk oscillator operating in the regime of positive intracavity group-delay dispersion (GDD). It delivers 1.7?ps pulses at an average power of 17?W and a repetition rate of 40?MHz. Dispersive mirrors compress the pulses to a duration of 190?fs (assuming sech2 shape; Fourier limit: 150?fs) at an average power level of 11?W. To our knowledge, this is the first KLM thin-disk oscillator with positive GDD. Output powers of up to 30?W were achieved with an increased output coupler transmission and intracavity GDD. We demonstrate increase of the pulse energy with increasing positive intracavity GDD, limited by difficulties in initiating mode-locking. 相似文献
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Motivated by the pulse compression challenge of novel long-cavity, high-pulse-energy Ti:sapphire laser oscillators, we report on ~280 nm supercontinuum generation and 4.5-times compression of close to transform limited, high-energy oscillator pulses using different large-mode-area photonic crystal fibers and standard chirped mirrors. As input, we used pulses of a long-cavity Ti:sapphire oscillator with 190 nJ pulse energy, 70 fs pulse length and 3.6 MHz repetition rate. Compressed pulses at the fiber/compressor output had a duration of 15–18 fs with up to 100 nJ pulse energy representing as much as 53 % throughput for the fiber/chirped mirror system. Using transform-limited input pulses, we could use short fiber pieces and thus a simple, low-dispersion chirped mirror compressor comprised of one pair of mirrors. 相似文献
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We report on high-energy femtosecond pulse generation from an ytterbium-doped rod-type fiber oscillator emitting around 976 nm. Self-starting and stable single-pulse operation are demonstrated with 4.2 W of average output power at a repetition rate of 8.4 MHz. The resulting energy level reaches 0.5 μJ. Because of the all-normal dispersion of the laser cavity, output pulses are naturally chirped with a duration of 14 ps. External compression using diffraction gratings shortens the pulse duration down to 460 fs. 相似文献
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We report a highly efficient and high power self-starting femtosecond Cr:forsterite laser pumped by a 1064-nm Yb doped fibre laser. Five chirped mirrors are used to compensate for the intra-cavity group-delay dispersion, and the mode-locking is initiated by a semiconductor saturable absorber mirror (SESAM). Under pump power of 7.9 W, stable femtosecond laser pulses with average power of 760mW are obtained, yielding a pump power slope efficiency of 12.3%. The measured pulse duration and spectral bandwidth (FWHM) are 46 fs and 45 nm; the repetition rate is 82 MHz. 相似文献
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A compact femtosecond Ti:sapphire ring oscillator composed of chirped mirrors is designed. By accurately optimizing the intra-cavity dispersion and the mode locking range of the ring configuration, we generate laser pulses as short as 7.7fs with a repetition rate as high as 745 MHz. The spectrum spans from 660nm to 94Ohm and the average output power is 480mW under the cw pump laser of 7.5 W. 相似文献