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In this paper, we present a theoretical model for the gain competition in dual-wavelength dye lasers. For this purpose the rate equations under the steady-state conditions have been used. The degree of the gain competition is shown to depend on the polarization of the two laser beams. The dependence of the gain competition on various working parameters such as pumping power, dye concentration and the reorientation rate of the molecules or solvent viscosity is studied for two different cases of parallel and orthogonal polarizations. The results of our model show dramatically different behaviors in the two proposed cases. 相似文献
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双波长分光光度法同时测定浆料中的聚乙烯醇和淀粉 总被引:1,自引:0,他引:1
本文报道了用双波长分光光度法同时测定变性聚乙烯醇和淀粉醋酸酯的一种新方法。分别选择670.0~540.0nm以及590.0~730.0nm波长对测定变性聚乙烯醇和淀粉醋酸酯。变性聚乙烯醇)~32μg/ml,淀粉醋酸酯0~130μg/ml浓度范围内,吸光度差值△A遵循比耳定律。当淀粉醋酸酯与变性聚乙烯醇的浓度比在1.3~16范围内,变性聚乙烯醇和淀粉醋酸酯的样品回收率分别为99.5~105%和97~108%。所拟定的方法可测定浆料中变性聚乙烯醇和淀粉醋酸酯。本法与盐酸水解淀粉法测定的聚乙烯醇含量相吻合。本法简便快速。 相似文献
3.
两次双波长分光光度法同时测定钴、镍、铜 总被引:1,自引:0,他引:1
本文用两次双波长分光光度法实现了三组分混合体系的同时测定。结果表明,两次双波长测量信号△A_1和△A_2的线性组合与混合体系中各组分浓度呈线性关系。该法用于钻、镍、铜三组分同时测定,定量结果令人满意。 相似文献
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实验研究了Nd∶YVO4/Nd∶GdVO4双波长激光器在不同抽运功率条件下,通过调节热沉温度达到功率均衡时的输出特性.实验结果表明:对于Nd∶YVO4/Nd∶GdVO4双波长激光器,当提高抽运功率,需要重新降低热沉温度达到功率均衡输出,降温幅度与抽运功率增加之比为11.23℃/W.与此同时,随着抽运功率和热沉温度的变化,双波长激光器的中心波长会出现小幅度的漂移,左峰波长随抽运功率增加的蓝移速率为0.056 nm/W,右峰波长随抽运功率增加的蓝移速率为0.054 nm/W.实验还发现功率均衡条件下激光器的输出总功率随抽运功率的增加而增加,拟合斜效率为8.7%,当抽运功率为5.58 W时,输出最大总功率达到115.7 mW. 相似文献
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用国产半导体激光二极管(LD)端面泵浦NdYAG晶体, 通过优化激光谐振腔反射膜系,调节1 064 nm谱线的线性损耗以达到与弱谱线946 nm的增益匹配,在室温下实现1 064 nm和946 nm双波长连续运转,并通过I类临界相位匹配LBO晶体腔内和频在国内首次实现500.8 nm青色激光连续输出.当泵浦注入功率为1.4W时和频青色激光最大输出达20 mW,光-光转换效率为1.4%,功率稳定性24 h内优于±3%. 相似文献
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Xinzheng Zhang Jingjun Xu Qian Sun Simin Liu Guoquan Zhang Haijun Qiao Feifei Li Guangyin Zhang 《Optics Communications》2000,180(4-6):211-215
A simple, convenient and effective way is demonstrated to reduce the field losses of the reconstructed image in the dual-wavelength nonvolatile holographic storage by adding a cylindrical lens in the holographic recording configuration. The experimental results show that this technique makes the dual-wavelength nonvolatile holographic storage compact and practical. 相似文献
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In this paper, the root mean square (rms) technique is applied in order to reduce the non-coherent noise in phase-contrast image. The proposed technique is applied to a sample of 200 μm step height nominally. The recorded off-axis interferograms generated from two different wavelengths are processed to obtain an object wave (amplitude and phase) for each wavelength separately. The independent phase maps are subtracted and a phase map for the beat-wavelength is obtained and converted to height map. The rms values of 10 pixels profiles from the obtained height map are calculated automatically to show the three-dimensional (3D) profile. The experimental results show that the non-coherent noise is reduced by the order of 90% when the rms technique is applied and the uncertainty in measurement has been found to be of the order of 1.5 μm. The proposed technique can provide a simple and real solution for measuring 3D objects having high abrupt height difference. 相似文献
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A sum-frequency yellow-green laser at 554.9 nm is reported by this paper, 946 nm wavelength is obtained from 4F3/2-4I9/2 transition in Nd:YAG and 1342 nm wavelength is obtained from 4F3/2-4I13/2 transition in Nd:YVO4. Using a doubly folded-cavity type-II critical phase matching KTP crystal intra cavity to make 946 nm laser from Nd:YAG and 1342 nm laser from Nd:YVO4 frequency summed, with incident pumped power of 30 W in Nd:YAG and 20 W in Nd:YVO4, TEM00 mode yellow-green laser at 554.9 nm at 1.15 W is obtained and its M2 factor is less than 1.22. The experimental results show that the Nd:YAG and Nd:YVO4 crystals intra-cavity sum-frequency mixing is an effective method for yellow-green laser and it can be applied to other two laser crystals to obtain more all-solid-state lasers with different wavelengths. 相似文献
10.
Baole Lu Haowei Chen Jiaxi Guo Renjian Zhang Zhaoyu Ren 《Optics Communications》2011,284(7):1941-1944
A dual-wavelength laser at 1064 nm and 1319 nm is obtained by a single Nd:YAG crystal rod. On the basis of 1064 nm and 1319 nm dual-wavelength laser installation, the second harmonic waves at 532 nm and 660 nm can be achieved by using non-linear frequency conversion technology. When 1064 nm and 1319 nm lasers oscillate simultaneously, the maximum output power is 30.5 W and 8.78 W, respectively. When the 1319 nm laser is restrained, we obtain a 35.6 W maximum output power at 1064 nm and by contrary 11.2 W at 1319 nm. The maximum output powers of 532 nm and 660 nm lasers are 5.34 W and 1.353 W when oscillating simultaneously. With one of them restrained, the maximum output power is 6.72 W at 532 nm and 1.90 W at 660 nm. The optimum repetition rate of the acousto-optic Q-switch is 10.5 KHz and 20.5 KHz for 532 nm and 660 nm lasers, respectively. The optical-to-optical conversion efficiency from the fundamental waves to the harmonic waves is 17.5% and 15.4%. The instability is less than 2%. 相似文献