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为研制百焦耳级KrF激光放大器,发展MOPA系统,我们用自探测法在百焦耳级电子束泵浦KrF激光装置上进行了激光放大器的增益与吸收的测量。泵浦率约为0.67MW/cm ̄2,激光介质为89.6%Ar:10%Kr:0.4%F_2的混合气体,总气压0.25MPa,实验测得激光放大器的小信号增益系数g_0=6.6%cm ̄(-1)、非饱和吸收系数α_n=0.93%cm ̄(-1)、饱和光强I_s=2.5MW/cm ̄2。 相似文献
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强激光冲击铝合金改性处理研究 总被引:13,自引:2,他引:13
利用新型聚偏1.1-二氟乙烯(PVDF)压电传感器,实现了对激光引发的冲击波压力的实时测量,得到激光引发的冲击波峰压在铝中成指数型的衰减规律;观测了不同约束层材料在铝靶表面产生的激光冲击波,研究了不同约束层对冲击效果的影响;最后用激光冲击强化装置对7050-T7451航空铝合金结构材料进行了冲击强化处理,对试件激光冲击区存在的残余压应力及位错密度进行了测量。结果显示经激光冲击处理的试件表面具有极高的残余压应力,可达-200MPa以上。激光冲击处理后铝合金的位错密度得到显著的提高,疲劳寿命提高到175%~428%。这些重要结果对激光冲击改性处理技术的实际应用具有指导性作用。 相似文献
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Yb3+:Y2O3透明陶瓷激光器获得5 W连续激光输出 总被引:12,自引:2,他引:10
用带尾纤输出的激光二极管作为抽运源,采用端面抽运10%Yb^3 :Y2O3多晶透明陶瓷的方式获得了连续激光输出。抽运阈值功率为5.6W,当陶瓷介质吸收的抽运功率为31.11W时,Yb^3 :Y2O3多晶透明陶瓷获得了最大连续激光输出功率5.48W。光—光转换效率为17.6%,斜率效率为25%。同时在激光实验过程中,没有发现饱和现象,因此采用更高功率的激光二极管作为抽运源,陶瓷的激光输出功率会得到进一步提高。这一研究成果表明,多晶透明陶瓷是一种非常有潜力的激光增益介质。 相似文献
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通过宽带激光脉冲放大的物理模型,以数值模拟为工具,研究分析了激光系统对不同带宽脉冲的放大能力,以及交叉弛豫时间对脉冲放大特性的影响.计算结果表明,随着带宽的增加,激光系统的输出能力逐渐降低,在其他条件相同时,宽带分别为2,5和10 nm时的输出能量比窄带输出(3000 J,1 ns脉宽)时分别减小了约2%,11%和27%;在带宽为几个纳米时完全非均匀加宽比完全均匀加宽的输出能量(3000 J,1 ns脉宽)降低了约20%;初步确定了交叉弛豫时间的范围为0—10 ns.
关键词:
激光系统
宽带激光
放大过程
交叉弛豫 相似文献
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《Infrared physics》1985,25(3):569-574
In order to stabilize the 118.8 μm CH3OH laser output, frequency stabilization of the CW 9P(36) CO2 laser pump is carried out using external CH3OH Stark-cell modulation without internal frequency modulation. The CO2 laser output power around the CH3OH absorption center is stabilized to within ±1.0% for 60 min. The frequency stability of the CO2 laser is estimated to be within ±1.4 MHz for 60 min, assuming the output fluctuation to be caused by this frequency fluctuation. As a result of the CO2 pump laser stabilization, an output power stability of about ± 1.0% for 30 min is obtained for the 118.8 μm CH3OH laser. 相似文献
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Xue-Peng Li 《中国物理 B》2022,31(8):84207-084207
A high-efficiency and high-power vertical-cavity surface-emitting laser (VCSEL) side-pumped rod Nd:YAG laser with temperature adaptability are demonstrated. The VCSEL side-pumped laser module is designed and optimized. Five VCSEL arrays are symmetrically located around the laser rod and a large size diffused reflection chamber is designed to ensure a uniform pump distribution. Furthermore, the absorbed pump power distribution of the rod is simulated to verify the uniformity of the pump absorption. Finally, a proof-of-principle experiment is performed in short linear cavity laser with single laser module. A continuous-wave output power of 658 W at 1064 nm is obtained, the corresponding optical-to-optical efficiency is 52.6%, and the power variations are ±0.7% over 400 s and ±3.1% over the temperature range from 16 ℃ to 26 ℃. To the best of our knowledge, this is the highest output power and the highest optical-to-optical efficiency ever reported for VCSEL pumped solid-state lasers. By inserting a telescopic module into the cavity and optimizing the TEM00 mode volume, the average beam quality is measured to be M2=1.34 under an output power of 102 W. The experimental results reveal that such a high power rod laser module with temperature stability is appropriate or field applications. 相似文献
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We report a diode-end-pumped continuous-wave (CW) Nd:YAG laser at 946 nm of single frequency operation. A ring laser resonator
was designed and the output coupler transmission was optimized based on the investigation of the influence of the output coupler
transmission on the thermal lens effect induced by energy-transfer upconversion. A maximum output power of 1.5 W CW single-frequency
laser at 946 nm was achieved. The stability of the laser output power was better than ±1% in the given four hours. 相似文献
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An intracavity etalon is used to suppress the vibration of the light at 1338 nm to get a stable laser output. An acousto-optic
Q-switched red laser output is obtained by intracavity frequency-doubling a Nd:YAG laser operating at 1319 nm with a type
II KTP crystal. At the pump power of 300 W, an average out-put power of 6.5 W at 660 nm is measured at single-end, and the
peak power is 65 kW. The stability has been kept less than ±1% in five hours. 相似文献
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B. -T. Zhang J. -F. Yang J. -L. He H. -T. Huang X. -L. Dong J. -L. Xu C. -H. Zuo K. -J. Yang 《Laser Physics》2009,19(7):1389-1394
By using a 15 mm-long type I phase-matching LBO crystal, a maximum quasi-continuous wave red laser output power of 12 W has been obtained by intra-cavity second-harmonic generation (SHG) in a compact acousto-optically Q-switched diode-side-pumped Nd:YAG laser. The corresponding optical-optical conversion efficiency is 6.6%. The power instability at the maximum output power is observed to be less than 4.62% during half an hour. The beam quality factor M2 is measured to be 9.9 ± 1.0 by the knife-edge method. The spectrum of the red radiation is also measured and discussed. 相似文献
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Passively mode-locked diode-pumped solid-state (DPSS) Nd:GdVO4 laser by using a saturable output coupler (SOC) in stable two-mirror linear cavity design is demonstrated. The laser was pumped by low-power single laser diode without any active cooling and external optics. Robust CW mode-locked operation was obtained with a repetition of 150–250 MHz, the pulsewidth was 12 ps, the lowest threshold for CW mode-locked was 185 mW. The optimal condition is found when the laser provides the set of characteristics: low CW mode-locking threshold (~260 mW), compact size (total cavity length 60 cm), good efficiency (~20%), and very stable output. At the output power of 270 mW an average power fluctuations within ±2% for long-term operation was obtained. 相似文献
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A ytterbium-doped double-clad fiber laser generating up to 1026 W of continuous-wave output power at 1085 nm with a slope efficiency of 74% by single-ended backward pumping configuration is reported. The core diameter was 20 μm with a low numerical aperture of 0.06, and a good beam quality (BPP < 1.8 mm mrad) is achieved without special mode selection methods. No undesirable roll-over was observed in output power with increasing pump power, and the maximum output power was limited by the available pump power. The instability of maximum output power was better than ±0.6%. Different pumping configurations were also compared in experiment, which shows good agreements with theoretical analyses. 相似文献
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Continuous-wave (CW) and Q-switched operation of a room-temperature Ho:LuAG laser was resonantly double-end-pumped by a diode-pumped
Tm:YLF laser at 1.91 μm. The CW Ho: LuAG laser generated 24.5 W of linearly output at 2094.4 nm with beam quality factor of
M
2 = 1.11 ± 0.02 for an absorbed pump power of 44.0 W, corresponding to optical-to-optical conversion efficiency of 55.7% and
slope efficiency of 60.5%. Under Q-switched operation, a maximum output power of 24.1 W with a slope efficiency of 58.1% at
12 kHz was obtained. Also, the minimum pulse width of 32 ns was achieved, corresponding to the peak power was 37.7 kW. 相似文献