共查询到20条相似文献,搜索用时 15 毫秒
1.
分析了利用光纤中的受激布里渊散射(SBS)相位共轭效应进行激光腔内调Q,产生ns量级脉冲激光的原理,并对利用该效应产生的激光脉冲波形和脉冲形成过程进行了数值模拟,得到的脉冲波形与SBS相位共轭反射率随时间变化曲线基本一致,表明利用光纤中的SBS相位共轭作用调Q具有可行性。据此,对采用单模光纤(SMF)作为SBS池的掺Er3+调Q光纤激光器进行实验研究,当单模光纤长度为1.5 m时,在45 mW的抽运光功率下得到脉宽约2.6 ns,脉冲周期58.23 ns,平均功率7.35 mW的激光脉冲。进一步的研究表明:激光器中相位共轭镜的形成与SBS介质长度有关,SBS介质过长,斯托克斯线之间无固定的相位关系,不能形成相干叠加,SBS相位共轭腔不能形成; SBS介质过短,腔内正交偏振模光子寿命的改变使脉冲出现双峰现象。脉冲形成后其属性只与SBS动态属性有关。 相似文献
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研究了相位共轭镜用于改善MOPA激光系统光束质量的特性研究.利用单纵模环形激光器作为振荡级,对加装有相位共轭镜的MOPA系统的相位共轭反射率、阈值进行了测试,并获得了重复频率10Hz、单脉冲能量大于200mJ、近衍射极限的高光束质量激光输出. 相似文献
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激光二极管列阵泵浦的位相共轭板条YAG激光放大系统 总被引:1,自引:0,他引:1
采用新型的微通道冷却半导体激光二极管列阵泵浦YAG激光振荡器及板条YAG放大器,文中用CCl4受激布里渊散射作位相共轭镜,使激光在板条放大器中作多通放大,获得了高重复率下小于1.5倍衍射极限的高质量1.06μm的激光输出,其脉冲宽度为15ns,平均功率为180W。 相似文献
4.
分析了利用光纤中的受激布里渊散射(stimulated Brillouin scattering,SBS)相位共轭效应进行激光腔内调Q,产生ns量级脉冲激光的原理,并对利用该效应产生的激光脉冲波形和脉冲形成过程进行了数值模拟,得到的脉冲波形与SBS相位共轭反射率随时间变化曲线基本一致,表明利用光纤中的SBS相位共轭作用调Q具有可行性.据此,对采用单模光纤(single-mode fiber,SMF)作为SBS池的Er3+掺杂调Q光纤激光器进行实验研究.当单模光纤长度为1.5 m时,在45 mW的光抽运功率下得到脉宽约2.6ns,脉冲周期58.23ns,平均功率7.35mW的激光脉冲.进一步的研究表明:激光器中相位共轭镜的形成与SBS介质长度有关,SBS介质过长,斯托克斯线之间无固定的相位关系,不能形成相干叠加,SBS相位共轭腔不能形成;SBS介质过短,腔内正交偏振模光子寿命的改变使脉冲出现双峰现象.脉冲形成后其属性只与SBS动态属性有关. 相似文献
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带受激布里渊散射相位共轭镜的Nd:YAG激光器 总被引:2,自引:0,他引:2
应用液体中受激布里渊散射相位共轭镜,与普通反射镜一起构成位相共轭谐振腔,得到了能量在10OmJ以上,脉宽在15ns以下的激光脉冲输出。实验测量了各种腔结构参数对输出能量的影响,并用相位板对该腔干扰,测量了其补偿特性。 相似文献
6.
以掺铜的钾钠铌酸锶钡晶体作为猫式自泵浦位相共轭镜,研究了位相共轭光的反馈对氩了激光器的输出功率,阈值工作电流,纵模及横模特性的影响,并对其机理进行了分析和讨论。 相似文献
7.
We report what is believed to be the first observation of phase conjugation by stimulated Brillouin scattering (SBS) in TeO2 single crystal. The observed very low threshold for phase-conjugate mirror (PCM) formation, high PCM reflectivities in this initial experiment, and commercial availability of material hold promise for a host of practical applications in the near future. The resultant steady-state gain parameter, approximately 100 cm/GW, is to our knowledge the largest ever reported for any SBS material. 相似文献
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Pulsed solid-state laser system with fiber phase conjugation and 315 W average output power 总被引:2,自引:0,他引:2
Solid-state laser sources with high average output power and high beam quality are required for numerous applications in industry
and science. To improve the beam quality, stimulated Brillouin scattering (SBS) mirrors based on optical phase conjugation
are used to compensate for phase distortions in master oscillator power amplifier (MOPA) systems. SBS phase conjugation in
commercially available silica optical fibers facilitates the construction of high-power solid-state laser systems with high
beam quality. Here we present a flash lamp-pumped, passively Q-switched Nd:YAP system which delivers an average output power
of 315 W with M2=2.6 at a wavelength of 1.08 μm.
Received: 11 July 2001 / Revised version: 28 September 2001 / Published online: 23 November 2001 相似文献
10.
Anirban Mitra Hidetsugu Yoshida Hisanori Fujita Masahiro Nakatsuka 《Optics Communications》2006,261(2):342-348
We present the correction of the phase distortion which occurs during the second harmonic generation by non-linear crystals, such as KDP and KTP at high average power laser. This is due to the optical quality and thicknesses of the crystals which in turn influence the quality of the incident laser beam. This phase distortion is corrected by reflecting back the laser beam into the crystal using a phase conjugate mirror. It is found that the conversion efficiency of second harmonic generation without phase conjugation is more than that with phase conjugation. Far field pattern shows that the distortion of the laser beam can be corrected by using the phase conjugate mirror. Fidelity of the beam profile increases significantly with phase conjugation in the case of KDP crystal. 相似文献
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Lizhi Dong Wenjin Liu Ping Yang Bing Xu Xiang Lei Yu Ning Hu Yan 《Optics Communications》2011,284(7):2003-2006
Misalignment of a laser cavity would result in the displacement of beam location on the cavity mirrors. We present a simple method for automatic cavity alignment of a solid-state laser through detecting the location of the laser beam on the rear mirror, with which neither external alignment beams nor modifications to the cavity are required. The rear mirror of the laser cavity is replaced by a tip/tilt mirror to compensate for the misalignment. Experiments show that this method could effectively correct the misalignment of the laser cavity and restore the output power to almost the original value when the resonator is well aligned. 相似文献
13.
介绍了低吸收高负载特性的全氟碳化合物SBS新介质,研究了SBS相位共轭镜和SBS光限幅器对新介质的选取原则,并在Nd: YAG调Q激光器中进行了实验验证.结果表明,SBS相位共轭镜需要平均分子量小,运动黏度小,增益系数大的介质;而SBS光限幅器需要平均分子量大,运动黏度大,增益系数小的介质.新介质的发现增加了SBS介质的种类,而介质的选取原则对新介质的选用打下了良好的基础.
关键词:
SBS新介质
选取原则
平均分子量
运动黏度 相似文献
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A phase conjugating mirror combining a fused silica rod and an optical fiber is presented. This configuration combines a large diameter fused silica rod with a high laser damage threshold and an optical fiber with a low stimulated Brillouin scattering (SBS) threshold. The composed SBS generator-amplifier construction, similar to the two-cell type makes a forced SBS process, in which the Stokes beam reflected by the fiber is injected into the fused silica rod. Using this combined phase conjugating mirror in a laser-diode-pumped laser master oscillator power amplifier system, we obtained 42% SBS reflectivity at most at 100 Hz repetition rate. At the same time, the inverse beam quality parameter M(2) is reduced from 3 to 1.6, while at 400 Hz repetition rate, M(2) is reduced from 4 to 1.7. 相似文献
16.
W. L. J. Hasi X. Y. Guo X. Li X. Z. Geng Z. W. Lu D. Y. Lin W. M. He R. Q. Fan 《Applied physics. B, Lasers and optics》2010,100(3):577-580
A new method based “Split-combined” principle is proposed to improve the load capacity of stimulated Brillouin scattering
(SBS) phase-conjugating mirror (PCM). The incident light is split into two beams by polarizer, which will respectively produce
SBS in the same experimental conditions, and then the generated two beams of Stokes light are combined together so as to improve
the system’s load capacity. The method is verified in Continuum Nd: YAG seed-injected laser system and use FC-72 as the SBS
medium. The results show that this method not only has a simple structure and high efficiency characteristics, but also improves
the system’s power-load capacity and acquires a better quality linearly-polarized beam, which is expected to provide a new
program for the application of SBS phase-conjugating mirror in a high-power system. 相似文献
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An oscillator-amplifier XeCl laser system has been used to experimentally investigate the effectiveness of a liquid stimulated Brillouin scattering (SBS) mirror for correcting the spatial aberrations of broad-band laser radiation in a double-pass amplifier. It has been found that the SBS amplifier performance is strongly dependent on the intensity I
p exciting the Brillouin medium. A good beam reconstruction has been attained at I
p1GW/cm2, whereas highly aberrated output beams have been delivered by the SBS amplifier for I
p>1 GW/cm2. By comparing the broad-band SBS amplifier performance to that of the same amplifier with a dielectrically coated flat mirror at one end, it has been found that the use of a SBS mirror is advantageous to obtain lower divergence output beams only for low energy pump beams (<1 mJ). 相似文献
20.
提出了一种可以满足大能量高峰值功率受激布里渊散射(SBS)相位共轭镜要求的独立双池结构,这种结构用在双程激光放大光路中可以补偿单程放大光路产生的动态和静态相位畸变.在7.1 J的入射能量下,最终得到了大于13 J的能量输出.相位共轭镜的能量反射率大于65%,相位共轭保真度达到90%,并且比较了以0°平面反射镜和以SBS相位共轭镜为腔镜的双程激光放大的输出结果,结果表明使用了SBS相位共轭镜之后,即使在大能量抽运的条件下也能得到很好的近场和远场保真度.
关键词:
受激布里渊散射
相位共轭镜
双程放大激光器
保真度 相似文献