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《光学学报》2010,(8)
在高功率激光二极管(LD)抽运条件下,固体增益介质的热透镜效应是优化激光谐振腔系统所必须考虑的重要因素之一。利用带尾纤耦合输出的激光二极管和整形聚焦透镜组组合抽运Nd:YVO4晶体,用稳腔法测量了激光晶体的等效热焦距。利用LAS-CAD软件模拟了三种热稳腔结构在所测等效热焦距下的模式分布,对LD双端抽运Nd:YVO4激光器Z字型谐振腔进行优化设计后,实验选定后腔镜曲率半径R1=300mm,输出镜曲率半径R2=100mm,腔长Ltotal=280mm,耦合输出镜透射率T=50%。当输入61W抽运功率时,激光最高输出功率达21.3W,光束质量因子M21.41,所得激光器输出结果与理论预期吻合得很好。 相似文献
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利用多个激光晶体串接方式可以提高固体激光器的输出功率 发展双Nd∶YVO4 晶体激光器 ,将晶体的端面镀膜作为谐振腔的端面镜 ,构成了平行平面谐振腔 对平行平面谐振腔的等效腔进行了理论分析 ,结果表明激光晶体吸收泵浦光产生的热透镜效应对保持腔的稳定性起到了重要的作用 在国内首次进行了双端泵浦双Nd∶YVO4 激光器的实验研究 ,在抽运功率为 2 0 .74W时获得了 11W的 10 6 4nmTEM0 0 模激光输出 ,其光 光转化效率约为 5 3% 并且对于不同掺杂浓度下的实验结果进行了讨论 相似文献
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端面泵浦双Nd: YVO4激光器中热效应对腔稳定性的影响 总被引:7,自引:6,他引:1
利用多个激光晶体串接方式可以提高固体激光器的输出功率. 发展双Nd: YVO4晶体激光器, 将晶体的端面镀膜作为谐振腔的端面镜, 构成了平行平面谐振腔. 对平行平面谐振腔的等效腔进行了理论分析, 结果表明激光晶体吸收泵浦光产生的热透镜效应对保持腔的稳定性起到了重要的作用. 在国内首次进行了双端泵浦双Nd: YVO4激光器的实验研究, 在抽运功率为 20.74 W时获得了11 W的1064 nm TEM00模激光输出, 其光-光转化效率约为53%. 并且对于不同掺杂浓度下的实验结果进行了讨论. 相似文献
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In this paper, a coupled-cavity Er-doped fiber laser is experimentally developed and analyzed. The proposed scheme has the advantage of an all-fiber configuration. Two similar fiber Bragg gratings are employed as reflective components of the main cavity containing the gain medium. The second cavity is generated, in one side, by the reflective flat end of a standard fiber optic pigtail of variable length and, in the other, by one of the Bragg gratings belonging to the main cavity. Depending on the ratio between the lengths of both cavities, trains of stable and short pulses were obtained with a repetition frequency larger than the frequency of the main cavity. The repetition rate of the pulse trains experimentally obtained was as high as 780 MHz (15 times the main cavity frequency) and the pulse width was ∼110 ps. Prediction of the possible repetition rates for each cavities lengths ratio and the upgrading possibilities of this laser system are analyzed. 相似文献
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For different external cavity lengths, lasing wavelength variation of fiber grating external cavity semiconductor laser (FGECSL) with ambient temperature has been investigated theoretically, and the theoretical results are in agreement with reported experimental observations. 相似文献
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微片激光器由于自身的内应力会输出频率分裂的正交偏振的两个模式.研究了回馈对微片激光器频差的影响.研究发现:在回馈的作用下微片激光器的频差大小呈现出以初始频差为中心的类正弦的频差调制,周期为λ/2;频差调制曲线的幅度与回馈水平成正比,但是当回馈水平过强时会出现偏振态跳变,从而使频差消失;在一定的回馈外腔范围内,频差调制曲线的幅度与初始频差亦成正比.并利用复合腔模型和激光器的自洽理论进行了理论分析和模拟,所得结果与实验结果相符.此调制现象在精密测量领域有潜在应用. 相似文献
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Laser properties of diode-side-pumped Nd:YAG laser operating at 1123 nm are demonstrated. A 1.0 at % Nd-doped Nd:YAG rod with a size of Ø3 × 63 mm2 is used as the active medium. Both radial and tangential thermal focal lengths of this side-pumped Nd:YAG rod are determined under lasing condition. The results show that the bifocusing strength of 1123 nm laser is larger than that of 1164 nm laser, and 1123-nm thermal focal lengths are shorter than those of 1064-nm laser due to higher quantum defect. Laser output performances of 1123 nm in terms of stability, output power and beam quality influenced by pump power at different cavity lengths are also discussed with a convex-piano cavity. 相似文献
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A multimode linear cavity and a single-mode unidirectional ring cavity fiber laser with meter-long cavity lengths are shown to exhibit frequency noise limited by fundamental thermodynamic noise from 100?Hz to 100?kHz. Their measured spectra agree closely with theoretically derived thermodynamic noise and the characteristic dependence of the frequency noise power spectrum on the inverse of the cavity length is observed. The unidirectional ring laser exhibits a frequency noise of 2?Hz/Hz(1/2) at 1?kHz, one of the lowest published values to date from a free-running laser. The multimode linear cavity laser is shown to be a suitable candidate for thermal-noise-limited, meter-long fiber laser strain sensors with a strain resolution of 14?f?/Hz(1/2) at 1?kHz. 相似文献
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A Smith–Purcell (S–P) free electron laser (FEL) composed of a metallic diffraction flat grating, an open cylindrical mirror cavity and a relativistic sheet electron beam with moderate energy, is presented. The characteristics of this device are studied by theoretical analysis, experimental measurements and particle-in-cell (PIC) simulation method. Results indicate that coherent radiation with output peak power up to 50 MW at millimeter wavelengths can be generated by using relativistic electron beam of moderate energy. 相似文献
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在高功率脉冲气体激光器中,用角隅反射镜作为全反镜,平行平面镜作为输出镜构成角隅全反镜谐振腔。对角隅腔激光器的输出特性和抗失调稳定性进行了研究,并与平凹腔和平平腔激光器进行了比较。实验结果表明:在角隅全反镜失调角为16 mrad时,角隅腔激光器的单脉冲输出能量下降9.2%,且近场输出光斑没有明显变化;而凹面全反镜失调角仅为0.4 mrad时,平凹腔激光器输出能量下降了9%,近场输出光斑严重变形。在输出镜正前方3.12 m处测量,当角隅镜偏转16.3 mrad时,激光器输出光斑与标准状态时的输出光斑重合;凹面全反镜失调角为0.4 mrad时,激光器输出光斑位移14 mm。经模式仪分析表明,角隅腔激光器近场光强分布均匀。 相似文献