共查询到20条相似文献,搜索用时 140 毫秒
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研究了主动-被动锁模技术中超短脉冲形成过程,分析了出现卫星脉冲原因,解决了驻波型声光调制器频率准确性和衍射效率问题。该振荡器的主要输出特性如下:1)输出锁模脉冲几率~100%;2)输出系列脉冲能量起伏<±8%;3)输出锁模脉冲脉宽起伏<±10%;4)信噪比10~7;5)输出锁模脉冲宽度20~100微微秒,分段可调。当脉宽为100微微秒时,光谱宽度~0.15埃, 相似文献
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为了克服主动锁模脉冲能量低、被动调Q锁模稳定性差、锁模不完全的缺点,采用Cr<'4+>:YAG和声光锁模器进行主被动联合锁模脉冲氙灯抽运的Nd:YAG激光器,实验验证和分析了Cr<4+>:YAG被动锁模,声光锁模器主动锁模及两者联合主被动锁模3种情况下输出脉冲的特性.结果表明,主被动联合锁模可得到200mJ输出能量、输... 相似文献
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该锁模激光器的主要特点是输出锁模脉冲信噪比高(≥107),输出稳定,输出系列脉冲能量起伏≤±8%,脉冲宽度起伏±10%。输出最窄脉冲宽度~25微微秒,单脉冲能量~1毫焦耳。 相似文献
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LD抽运锁模Nd:YAG激光器研究 总被引:1,自引:1,他引:0
利用Cr4+:YAG和声光锁模器联合对光纤耦合LD抽运Nd:YAG激光器进行主被动锁模,比较和分析了Cr4+:YAG被动锁模,声光锁模器主动锁模及两者联合主被动锁模三种情况下平均输出功率的特性,结果表明主被动联合锁模克服了主动锁模稳定性差、被动锁模输出功率低、锁模不完全的缺点,得到幅值和能量抖动小于±6%、锁模深度100%、脉宽小于410ps、输出平均功率290mW的绿光锁模脉冲。 相似文献
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对脉冲氙灯泵浦的调Q-锁模Nd:YAG固体激光器进行了实验研究.比较和分析了声光主动锁模、Cr4 :YAG晶体被动调Q-锁模以及这两种机制联合锁模情况下Nd:YAG激光器的输出特性.在Cr4 :YAG晶体被动调Q-锁模时得到了深度80%以上的锁模输出,但是锁模不完全,且波形和能量稳定性低,脉宽为1.9~3.6 ns.而主被动联合锁模克服了这一缺点,可获得幅值和能量抖动小于±5%、锁模深度100%、脉宽小于650ps、能量近300mJ的超短脉冲输出. 相似文献
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本文报道了用锁模磷酸盐玻璃激光的倍频光泵浦若丹明B超短腔染料激光器的实验装置和实验结果,用TPF和OSA的组合装置研究了磷酸盐玻璃激光器的最佳运转条件,得到了脉宽~5ps的锁模脉冲系列,以此ps光源泵浦的染料激光器获得了波长为620.1~641.6nm,脉冲宽度小于4ps的单模可调谐激光输出。 相似文献
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An infrared-sensitive streak camera, capable of resolving optical pulses of durations of ∼3 ps, has been used to analyze the temporal development of the individual picosecond pulses in a mode-locked pulse train. A progressive increase in the duration of the individual pulses throughout the pulse train is observed, the rate of increase in the pulse duration being an approximate quadratic function of the optical field. In addition, temporal analysis of the laser output signal, dispersively delayed with the aid of a grating pair, confirms the existence of phase-modulation effects during the development of the mode-locked pulse train. 相似文献
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Mar A. Helkey R. Bowers J. Mehuys D. Welch D. 《Photonics Technology Letters, IEEE》1994,6(9):1067-1069
We report the first mode-locked operation of a tapered amplifier MOPA to generate short optical pulses with record high average powers and pulse energies. The MOPA is constructed using a discrete semiconductor oscillator and amplifier operating at 940 mm wavelength. Pulses of 4.2 ps duration are generated with average powers of 296 mW and peak powers of 28.1 W. The energy of these pulses was 118 pJ, corresponding to energies more than an order magnitude greater than the gain saturation energy in the mode-locked laser itself, and also corresponds to energies internal in the amplifier in excess of the gain saturation energy. Although the amplifier saturation energy limits the pulse energy obtainable in a mode-locked laser, the MOPA configuration demonstrates that generation of pulses with energies in excess of the amplifier saturation energy is feasible in a post-amplification stage 相似文献
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Iannone P.P. Prucnal P.R. Raybon G. Koren U. Burrus C.A. 《Quantum Electronics, IEEE Journal of》1995,31(7):1285-1291
We demonstrate 5.0-nm wavelength conversion of a mode-locked optical pulse train by cavity-enhanced highly nondegenerate four-wave mixing in a 1.53-μm injection-locked bulk InGaAsP V-groove laser. Input pulses having 17 ps duration are broadened to 61 ps due to the filtering imposed by the mixing laser. A simple two-mode rate equation model of an injection-locked semiconductor laser is used to explain the dependence of the output pulse broadening on bias current and injected pump power. The temporal response is improved by decreasing the laser bias current or increasing the injected pump power 相似文献
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Scott G. Clark J. Tolbert M. Webb S. Cox A. Renz G. 《Quantum Electronics, IEEE Journal of》1983,19(4):544-550
We report simultaneous quantitative spectral and temporal measurements of the output pulses from a single-axial mode rhodamine 6G short cavity (1-8 mu m) dye laser. The dye laser was pumped at 10 Hz with single second harmonic (532 nm) pulses from a mode-locked Nd+3:YAG laser. Spectral measurements made with a high resolution spectrograph and temporal measurements made with an ultrafast streak camera indicate the production of Fourier transform limited pulses for near threshold operation. Output pulses of 7-14 ps (FWHM) are observed from the short cavity dye laser when pumped with 15-30 ps duration 532 nm pulses. The output pulse delay and jitter are also investigated. A theoretical model for the temporal evolution of the pulses is presented and compared with the experimental results. 相似文献
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Budz A. J. Logan A. S. Strickland D. Haugen H. K. 《Photonics Technology Letters, IEEE》2007,19(2):94-96
Ultrashort optical pulses are generated using a hybrid master oscillator power amplifier source. Pulses 2.2 ps in duration generated by a two-contact, bent-waveguide passively mode-locked semiconductor laser are amplified in a ytterbium-doped fiber amplifier to an average power of 0.8 W. External pulse compression yields durations as low as 765 fs with peak powers as high as 0.9kW. Amplification of the harmonically mode-locked diode output has also been demonstrated at the eighth harmonic 相似文献
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Davi S. Gaasterland D. Cummins C. III Liesegang G. 《Quantum Electronics, IEEE Journal of》1984,20(12):1458-1465
Energy and power density damage thresholds were determined in air, for plastic IOL's and membranes at the focal point of several solid-state laser systems: 1) 694 nm,Q -switched single pulse (30 ns), multimode, 2) 1064 nm,Q -switched single pulse (20 ns), TEM00 , 3) 1060 nm, mode-locked single pulse, 15 ps, TEM11 , 4) 530 nm, mode-locked single pulse, 15 ps, TEM11 , and 5) 1064 nm, mode-locked pulse train (9-11 pulses, 30 ps), TEM00 . Pulse energies bracketing damage thresholds as well as focal diameter and pulse duration for each system were determined. Energy density thresholds are lower, and power density thresholds higher, for shorter duration pulses-e.g., 23 J/cm2(1.15 GW/cm2) versus 6 J/cm2(400 GW/cm2) at the same wavelength as in systems 2) and 3) (p = 0.005). Damage thresholds for glass IOL's are 37 J/cm2(1.9 GW/cm2) and 37 J/cm2(1235 GW/cm2) as in systems 2) and 5). Damage threshold values for plastic membranes (Saran Wrap®) exposed to nanosecond and picosecond pulse trains of Nd:YAG at 1064 nm are about half that of plastic IOL's. When laser pulses with a cone angle of 14° from systems 2) and 5) are focused on plastic membrane next to the IOL, damage thresholds are 30 J/cm2(1.5 GW/cm2) for 20 nsQ -switched pulses and 20 J/cm2(670 GW/cm2) for trains of 30 ps mode-locked pulses. Damage thresholds of IOL's immersed in 0.9 percent saline are approximately the same as those obtained in air. 相似文献
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An electrooptic, actively mode-locked Nd: phosphate glass laser system is described employing a novel single-step feedback system to stabilize the pulse buildup time. Single output pulses of ∼100 ps duration with energies of up to 1 mJ could be reliably generated with a standard deviation in thesim3.2 mu s pulse buildup time of ±40 ns allowing synchronization with pulses from laser systems at other wavelengths. Evidence of pulse broading due to self-phase modulation was observed together with wide tunability of the output wavelength from 1.054 to 1.068 μm. 相似文献