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LASER TRACT ELEMENTS: Reducing the optical load and altering the mode content in the HSURIA axicon resonator 激光通道元件:降低HSURIA轴子谐振腔的光负载和改变模含量
Pub Date : 1992-10-31 DOI: 10.1070/QE1992V022N10ABEH003630
S. V. Rulev, V. Shcheglov
A high concentration of radiation appears near the center of the convex mirror in the HSURIA axicon resonator. In this paper we discuss a method of reducing this concentration by extending the central cone of the W-axicon outward. We describe a more efficient algorithm for three-dimensional diffraction calculations on the field propagation in a cylindrical coordinate system by the stationary-phase method. We investigate the intensity of the highest-Q mode at the center of the convex mirror and the loss coefficient of lower modes of the resonator as a function of the distance which the central cone of the W-axicon extends outward.
在HSURIA轴子谐振器中,凸面镜中心附近出现了高浓度的辐射。本文讨论了一种通过向外扩展w轴子的中心锥来降低这种浓度的方法。本文描述了一种更有效的圆柱坐标系下三维衍射场传播计算方法——定相法。我们研究了凸面镜中心处最高q模的强度和谐振腔低模的损耗系数与w轴子中心锥向外延伸的距离的关系。
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引用次数: 0
A more accurate method of measuring the cross section for the 52P1/2→52P3/2 transition of atomic iodine in photodissociation lasers based on dynamic self-diffraction 基于动态自衍射的光解激光器中碘原子52P1/2→52P3/2跃迁截面的精确测量方法
Pub Date : 1992-10-31 DOI: 10.1070/QE1992V022N10ABEH003629
K. S. Korol'kov, A. Y. Krylov, O. Y. Nosach, E. P. Orlov
We have developed a new method for measuring the cross section for the 52P1/2→52P3/2 transition of atomic iodine in photodissociation lasers. The inverse recombination of iodine atoms is monitored via dynamic self-diffraction of the laser radiation in the active medium. We have measured the cross section in mixtures of H-C3F7I and CF3I with Xe. This new method substantially increases the accuracy with which the cross section can be measured. Our results are highly reproducible, with a dispersion of no more than 3%.
本文提出了一种测量碘原子在光解激光器中52P1/2→52P3/2跃迁截面的新方法。利用激光辐射在活性介质中的动态自衍射来监测碘原子的逆复合。我们测量了H-C3F7I和CF3I与Xe混合物的截面。这种新方法大大提高了测量截面的精度。结果重现性好,分散度不超过3%。
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引用次数: 0
Schrödinger soliton in a fiber waveguide exhibiting both gain and losses: squeezed states and growth of noise in the linear approximation Schrödinger同时显示增益和损耗的光纤波导中的孤子:线性近似中的压缩状态和噪声的增长
Pub Date : 1992-09-30 DOI: 10.1070/QE1992V022N09ABEH003608
A. V. Belinskii
An investigation is made of the evolution of quantum fluctuations of a fundamental soliton in the course of its propagation in a nonlinear fiber waveguide characterized by losses and compensated by amplification. Simple relationships are obtained for the amplitude and phase noise, quantum uncertainty of the position and momentum, and also fluctuations of the quadrature components of the radiation field. Numerical estimates are obtained. It is shown that loss-compensating amplification is unnecessary for efficient formation of squeezed states of a soliton.
研究了一个基本孤子在非线性光纤波导中以损耗和放大补偿为特征的传播过程中的量子涨落演化。得到了振幅和相位噪声、位置和动量的量子不确定性以及辐射场正交分量的涨落之间的简单关系。得到了数值估计。证明了损耗补偿放大对于孤子压缩态的有效形成是不必要的。
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引用次数: 0
LASERS: Modeling of a 10-liter electric-discharge XeCl laser 激光器:10升放电XeCl激光器的建模
Pub Date : 1992-09-30 DOI: 10.1070/QE1992V022N09ABEH003597
A. Dem’yanov, I. Kochetov, A. Napartovich, M. Capitelli, C. Gorse, S. Longo
Theoretical models developed independently by groups in Russia and Italy were used to describe the operation of a 10-liter electric-discharge XeCl laser. The calculations gave similar results for an HCl pressure of 1.5 Torr, but diverged strongly at low (0.5 Torr) and high (4 Torr) HCl pressures. The reasons for this discrepancy were determined. It was found that homogeneous models cannot describe the experimental data satisfactorily.
由俄罗斯和意大利的小组独立开发的理论模型被用来描述10升放电XeCl激光器的操作。在HCl压力为1.5 Torr时,计算结果相似,但在低(0.5 Torr)和高(4 Torr) HCl压力下,计算结果大相径庭。造成这种差异的原因已经确定。结果表明,均匀模型不能很好地描述实验数据。
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引用次数: 2
Free-electron lasers with an oppositely directed longitudinal magnetic field 具有反向纵向磁场的自由电子激光器
Pub Date : 1992-09-30 DOI: 10.1070/QE1992V022N09ABEH003598
V. A. Bazylev, A. Tulupov
A theoretical interpretation is given of the effects in a free-electron laser with a longitudinal magnetic field oriented the opposite to the electron beam.
对纵向磁场方向与电子束方向相反的自由电子激光器中的效应作了理论解释。
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引用次数: 0
Dynamics of stimulated emission from a multimode laser considered allowing for stimulated Brillouin scattering 考虑受激布里渊散射的多模激光器受激发射动力学
Pub Date : 1992-09-30 DOI: 10.1070/QE1992V022N09ABEH003599
G. É. Nekrasova, M. V. Pyatakhin
A multimode laser with a dynamic system typical of intracavity laser spectroscopy is analyzed allowing for a mechanism that may possibly flatten the stimulated emission spectrum when stimulated Brillouin scattering (STBS) occurs in the active medium. A numerical analysis of the dynamics of such a laser is carried out in terms of kinetic equations. It is found that STBS in an active medium shifts the lasing spectrum with time in the direction of the red wavelengths. The time needed for the establishment of dips in the emission spectrum of a laser, corresponding to narrow-band absorption lines, decreases on increase in the nonlinearity, but the relative depth of the dips decreases. An effect similar to the condensation of the spectrum in the vicinity of an absorption line is predicted.
分析了一种具有典型腔内激光光谱动态系统的多模激光器,考虑了当受激布里因散射(STBS)发生在活性介质中时,可能使受激发射光谱变平的机制。用动力学方程对这种激光器的动力学进行了数值分析。研究发现,在有源介质中,STBS使激光光谱随时间向红波长方向偏移。在激光发射光谱中建立与窄带吸收线相对应的倾角所需的时间随着非线性的增加而减少,但倾角的相对深度减小。预计在吸收线附近会出现类似光谱凝聚的效应。
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引用次数: 1
CRYSTALS OF YB3SC2GA3O12:CR3+:HO3+ AS A PROMISING MATERIAL FOR CASCADE LASING OF HO3+ IONS yb3sc2ga3o12: cr3 +: ho3 +晶体是一种很有前途的ho3 +离子级联激光材料
Pub Date : 1992-09-30 DOI: 10.1070/QE1992V022N09ABEH003595
A. Denisov, A. I. Zagumennyi, G. Lutts, V. Osiko, S. G. Semenkov, A. Umyskov
An investigation was made of the possibility of lasing of Ho3+ ions in a Yb3Sc2Ga3O12:Cr3+:Ho3+ crystal in accordance with a cascade scheme 5I6→5I7→5I8 using flashlamp pumping at room temperature. The lifetime of the 2F5/2 level of the Yb3+ ion and of the 5I6 and 5I7 levels of the Ho3+ ion were determined. The efficiency of the Cr3+→Yb3+→Ho3+ energy transfer chain was 60%.
研究了在室温条件下,用闪光灯抽运Yb3Sc2Ga3O12:Cr3+:Ho3+晶体,按照5I6→5I7→5I8级联方案,激光激发Ho3+离子的可能性。测定了2F5/2级Yb3+离子和5I6、5I7级Ho3+离子的寿命。Cr3+→Yb3+→Ho3+的能量转移链效率为60%。
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引用次数: 2
APPLICATIONS OF LASERS AND OTHER TOPICS IN QUANTUM ELECTRONICS: Determination of the spatial characteristics of the radiation emitted by pulsed ultraviolet lasers using a photodiode array 激光在量子电子学中的应用和其他主题:利用光电二极管阵列测定脉冲紫外激光发射的辐射的空间特性
Pub Date : 1992-09-30 DOI: 10.1070/QE1992V022N09ABEH003615
V. Gorbachev, V. Gorokhov, A. V. Kalutskii, V. Karelin, V. Korolev, V. I. Smerdov
An MF-14 photodiode array was used to determine the radiation field of pulsed ultraviolet lasers. The responsivity of this array at the wavelength of 0.337 μm was S = 4 × 108 V/J. The distributions of the radiation from an N2 laser were determined in the near-field zone. The distributions were also obtained for XeF, XeCl, and KrF excimer lasers in the far-field zone. The angular dimensions of the distributions were determined.
采用MF-14型光电二极管阵列测量了脉冲紫外激光器的辐射场。该阵列在0.337 μm波长处的响应度为S = 4 × 108 V/J。测定了氮气激光在近场区的辐射分布。得到了XeF、XeCl和KrF准分子激光器在远场区的分布。确定了分布的角尺寸。
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引用次数: 0
Gas hydrodynamics of metal cutting by cw laser radiation in a rare gas 稀有气体中连续波激光切割金属的气体流体动力学
Pub Date : 1992-09-30 DOI: 10.1070/QE1992V022N09ABEH003612
N. K. Makashev, E. S. Asmolov, V. Blinkov, A. Boris, O. Buzykin, A. Burmistrov, M. R. Gryaznov, V. Makarov
A quantitative physical model of metal cutting by cw laser radiation in the absence of chemical reactions was developed. An experimental study was made of the flow of the processing gas using a geometrically similar model. The distributions of the pressure and velocity of the gas were determined at the cutting front. Simplified mathematical algorithms for the thermal problem were constructed and calculations were made of the maximum depth of the cut (kerf) and cutting speed as functions of the laser beam parameters. Possible nonsteady-state characteristics of the motion of the melt and of the cutting front were considered. A thermal mechanism was proposed for the formation of the regular rippling of the kerf, based on a balance between capillary forces and forces exerted on the melt by the gas stream in the vicinity of the upper edge of the cutting front. Simple formulas were obtained for calculating the depth and period of the ripples.
建立了无化学反应条件下连续波激光切割金属的定量物理模型。采用几何相似模型对工艺气体的流动进行了实验研究。测定了切割前气体压力和速度的分布。建立了热问题的简化数学算法,并计算了最大切割深度和切割速度随激光束参数的变化。考虑了熔体运动和切割前沿运动可能存在的非稳态特性。基于毛细力和切割锋面上缘附近气流对熔体施加的力之间的平衡,提出了形成切口规则波纹的热机制。得到了计算波纹深度和周期的简单公式。
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引用次数: 16
DYNAMICS OF EMISSION FROM A SEMICONDUCTOR LASER WITH AN EXTERNAL RESONATOR 外腔半导体激光器的发射动力学
Pub Date : 1992-09-30 DOI: 10.1070/QE1992V022N09ABEH003596
N. Gavrilenko, V. D. Kurnosov, O. Semenova, S. K. Taktashov, R. V. Chernov, Yu P Chetkin
Theoretical and experimental investigations were made of an ILPN-216A semiconductor emitter operating at 1.3 μm. A feature of the design of this emitter was a laser diode with an external resonator as the active element. The calculations were in good agreement with the experimental values of the mode intensity in the cw and pulsed regimes. In the pulsed regime when the ILPN-216A emitter was pumped additionally by a continuous threshold current, a single-frequency radiation spectrum was obtained and the ratio of the emitted mode to the adjacent mode was at least 20 dB.
对工作在1.3 μm的ILPN-216A半导体发射极进行了理论和实验研究。该发射器设计的一个特点是用一个外部谐振器作为有源元件的激光二极管。计算结果与连续波和脉冲模态强度的实验值吻合较好。在脉冲状态下,当外加连续阈值电流泵浦ILPN-216A发射极时,可获得单频辐射谱,且发射模式与相邻模式之比至少为20 dB。
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引用次数: 1
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Soviet Journal of Quantum Electronics
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