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Thermoelastic stresses in high-power CW diode laser arrays assembled on CuW and AlN submounts 高功率连续波二极管激光阵列在CuW和AlN底座上的热弹性应力
IF 0.9 4区 工程技术 Q3 Engineering Pub Date : 2022-05-01 DOI: 10.1070/qel18040
V. P. Gordeev, V. A. Oleshchenko, V. V. Bezotosnyi
Comparative results are presented of 3D-calculation for thermoelastic stress (TES) profiles in diode laser arrays (LDAs) assembled on CuW and AlN submounts (temperature compensators) and operating at a continuous-wave (CW) thermal power load of up to 220 W. For the first time, the simulation has revealed substantial differences in the maximal TES values for the arrays assembled on CuW and AlN submounts, as well as pronounced features of TES distribution in LDA assemblies, in particular, near the rear (highly reflecting) mirror of the laser diode cavity in similar geometries of temperature compensators. Results of the numerical simulation qualitatively agree with thorough measurements of spectral distributions over the LDA emitting aperture. The obtained results are interesting for mastering the production technologies of high-power devices aimed at improving their output parameters and service life.
在连续波(CW)热功率负载高达220 W的情况下,对装配在CuW和AlN亚基(温度补偿器)上的二极管激光阵列(LDAs)的热弹性应力(TES)曲线进行了三维计算比较。该模拟首次揭示了组装在CuW和AlN亚基上的阵列的最大TES值的显著差异,以及LDA组件中TES分布的显著特征,特别是在相似几何形状的温度补偿器中,靠近激光二极管腔的后(高反射)镜的位置。数值模拟的结果与LDA发射孔径上光谱分布的全面测量结果在定性上一致。所得结果对掌握大功率器件的生产工艺,提高其输出参数和使用寿命具有重要意义。
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引用次数: 0
Interaction of an array of single-electron quantum dots with a microcavity field with allowance for Coulomb correlations 考虑库仑相关的单电子量子点阵列与微腔场的相互作用
IF 0.9 4区 工程技术 Q3 Engineering Pub Date : 2022-05-01 DOI: 10.1070/QEL18046
A. V. Tsukanov, I. Kateev
We consider an ordered array of semiconductor single-electron quantum dots located in the antinode of a mode of a microcavity based on a two-dimensional photonic crystal. The influence of Coulomb effects on the energy exchange between quantum dots and the mode is studied in arrays for different numbers of dots. The stability of resonant electron – photon dynamics is analysed as a function of technological deviations of the dot parameters caused by the imperfection of the manufacturing procedure. Using the data of numerical simulation of the spectroscopic response of the system, criteria are formulated for using such a structure as a detector of localised charges. The parameters of the photonic crystal are chosen, which make it possible to implement the proposed measurement scheme.
我们考虑了一个有序的半导体单电子量子点阵列,它位于基于二维光子晶体的微腔的一个模式的正极上。研究了不同数量量子点阵列中库仑效应对量子点与模式之间能量交换的影响。分析了谐振电子-光子动力学的稳定性与制造工艺缺陷引起的点参数工艺偏差的关系。利用系统光谱响应的数值模拟数据,制定了使用这种结构作为局域电荷检测器的准则。对光子晶体的参数进行了选择,使所提出的测量方案得以实现。
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引用次数: 2
Two-level gas laser with transverse diode pumping 具有横向二极管泵浦的二能级气体激光器
IF 0.9 4区 工程技术 Q3 Engineering Pub Date : 2022-05-01 DOI: 10.1070/QEL18038
A. Parkhomenko, A. Shalagin
We theoretically study a new method for generating laser radiation by a two-level system without population inversion in the ‘red’ wing of its spectral line under resonant absorption of broadband radiation from pump laser diodes. A two-level system simulates the atoms of an active gas in an atmosphere of a high-pressure buffer gas. The effect results from the fact that in the ‘red’ wing of the spectral line, the probability of stimulated emission exceeds the probability of absorption if the homogeneous broadening due to the interaction of particles with the buffer gas significantly exceeds the natural one (at high pressures of the buffer gas). Analytical formulae are obtained that describe the operation of a two-level gas laser with transverse diode pumping. It is found that the longer the active medium, the higher the buffer gas pressure and pump radiation intensity, and the smaller the width of the pump radiation spectrum, the greater the efficiency of conversion of pump radiation into laser radiation. In a sufficiently long active medium (the length of the medium is 50 times its width), the conversion efficiency can reach 44 % at a buffer gas pressure of 5 atm, a pump diode radiation intensity of 3 kW cm−2, and a half-width of its spectrum of 1 cm−1. A two-level gas laser with transverse diode pumping is capable of generating continuous optical radiation with a very high (up to 100 kW) power. The frequency of laser radiation can be tuned by several tens of cm−1.
我们从理论上研究了一种共振吸收泵浦激光二极管宽带辐射的双能级系统产生激光辐射的新方法,该方法在其光谱线的“红”翼没有人口反转。两能级系统模拟高压缓冲气体大气中活性气体的原子。这种效应是由于在光谱线的“红色”翼中,如果粒子与缓冲气体的相互作用引起的均匀展宽明显超过自然展宽(在缓冲气体的高压下),则受激发射的概率超过吸收的概率。得到了描述横向二极管抽运的两能级气体激光器工作的解析公式。研究发现,活性介质越长,缓冲气体压力和泵浦辐射强度越高,泵浦辐射光谱宽度越小,泵浦辐射转化为激光辐射的效率越高。在足够长的有效介质中(介质长度为介质宽度的50倍),当缓冲气体压力为5atm,泵浦二极管辐射强度为3kw cm−2,其光谱半宽为1cm−1时,转换效率可达44%。具有横向二极管泵浦的两能级气体激光器能够产生非常高(高达100千瓦)功率的连续光辐射。激光辐射的频率可以调谐到几十厘米−1。
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引用次数: 1
Optical second harmonic generation: role of symmetry and local resonances (review) 光学二次谐波的产生:对称性和局部共振的作用(复习)
IF 0.9 4区 工程技术 Q3 Engineering Pub Date : 2022-05-01 DOI: 10.1070/qel18037
I. Baranova, T. Dolgova, I. Kolmychek, A. Maydykovskiy, E. Mishina, T. Murzina, A. A. Fedyanin
We report some results of studying optical second-harmonic generation (SHG) on surfaces and at interfaces of centrosymmetric media, in resonant nano- and microstructures, and in ferroelectric materials. The research was carried out at the Department of Quantum Electronics of the Lomonosov Moscow State University under the supervision of Professor O.A. Aktsipetrov, and subsequently developed by his disciples. As examples that clearly demonstrate the possibilities of the SHG method for examining nonstandard objects of nonlinear optics, we discuss the behaviour of the nonlinear optical response of single-crystal silicon and germanium surfaces and their interfaces with oxides, as well as nonlinear electroreflection. Optical interferometry and its possibilities are briefly described using the example of these systems. Unique sensitivity of SHG to the symmetry and resonance properties of nanostructures, including magnetic ones, is shown, which determines the efficiency of this method for investigating such systems. Finally, we demonstrate that the SHG effect is a unique remote and sensitive method for studying ferroelectric structures.
本文报道了在中心对称介质的表面和界面、共振纳米和微结构以及铁电材料中光学二次谐波产生的一些研究结果。这项研究是在罗蒙诺索夫莫斯科国立大学量子电子系在O.A.阿克齐彼得罗夫教授的指导下进行的,随后由他的弟子发展。我们讨论了单晶硅和锗表面及其与氧化物的界面的非线性光学响应行为,以及非线性电反射,作为清楚地证明了SHG方法检测非线性光学非标准物体的可能性的例子。以这些系统为例,简要介绍了光学干涉测量及其可能性。SHG对纳米结构(包括磁性结构)的对称性和共振特性具有独特的敏感性,这决定了该方法研究此类系统的效率。最后,我们证明了SHG效应是研究铁电结构的一种独特的远程和灵敏的方法。
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引用次数: 1
Superluminescence in the phonon wing of the photoluminescence spectrum of NV centres in diamond optically pumped at λ = 532 nm λ = 532 nm光抽运金刚石NV中心光致发光光谱声子翼的超发光
IF 0.9 4区 工程技术 Q3 Engineering Pub Date : 2022-05-01 DOI: 10.1070/qel18044
E. Lipatov, D. E. Genin, M. Shulepov, E. N. Tel’minov, A. Savvin, A. Eliseev, V. Vins
Superluminescence of NV centres with a band peaking at λ = 718 nm in the phonon wing of the photoluminescence spectrum of a high-pressure high-temperature (HPHT) diamond sample under pulsed optical excitation at λ = 532 nm with an intensity of 2 – 46 MW cm−2 is demonstrated. Superluminescence is observed in the diamond crystal region containing 6 ppm NV centres and 150 ppm substituent nitrogen; it is absent in the crystal part with a lower nitrogen content. Superluminescence pulses are observed on the leading edge of the optical excitation pulse at λ = 532 nm and have an FWHM value of 4 ns. The enhancement of the photoluminescence of NV centres is suggested to be due to the total internal reflection in the diamond plate (waveguide effect).
在波长为λ = 532 nm、强度为2 ~ 46 MW cm - 2的脉冲光激发下,高压高温(HPHT)金刚石样品的光致发光光谱声子翼出现了峰值为λ = 718 nm的NV中心超发光现象。在含有6 ppm NV中心和150 ppm取代氮的金刚石晶体区域观察到超发光;氮含量较低的晶体部分不含氮。在λ = 532 nm处的光激发脉冲前缘观测到超发光脉冲,其FWHM值为4 ns。NV中心的光致发光增强被认为是由于金刚石片的全内反射(波导效应)。
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引用次数: 3
The concept of a stigmatic flat-field X-ray spectrograph based on conical diffraction 基于锥形衍射的柱头平场x射线摄谱仪的概念
IF 0.9 4区 工程技术 Q3 Engineering Pub Date : 2022-05-01 DOI: 10.1070/QEL18048
A. O. Kolesnikov, E. Ragozin, A. Shatokhin
The optical scheme of a flat-field stigmatic X-ray spectrograph, which includes a grazing-incidence focusing mirror and a concave fan-type diffraction grating crossed with respect to the mirror and mounted in a conical diffraction scheme, is calculated analytically. Spectral images of a point monochromatic source are obtained by numerical ray tracing, confirming the high quality of spectral images at a level of 1 × 4 μm. It is assumed that the use of small grazing incidence angles in combination with the application of multilayer reflective coatings, including aperiodic ones, will make it possible to extend the working spectral range of the stigmatic spectrograph to the region of the ‘tender’ (ℏω ≈ 1.5 – 6 keV) X-ray range.
解析计算了平面场柱头x射线光谱仪的光学方案,该方案包括一个掠入射聚焦镜和一个凹扇形衍射光栅,该光栅与反射镜交叉并以锥形衍射方案安装。采用数值射线追迹法获得了点单色光源的光谱图像,证实了1 × 4 μm水平的高质量光谱图像。假设使用小的掠射入射角结合多层反射涂层的应用,包括非周期涂层,将有可能将污名谱仪的工作光谱范围扩展到“tender”(χ ω≈1.5 - 6 keV) x射线范围。
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引用次数: 0
Attenuation of the intensities of spectral components of a multiwavelength pulsed laser system by means of the Bragg diffraction of radiation by several acoustic waves 用几种声波辐射的布拉格衍射法对多波长脉冲激光系统光谱成分强度的衰减
IF 0.9 4区 工程技术 Q3 Engineering Pub Date : 2022-05-01 DOI: 10.1070/qel18042
A. Machikhin, M. Sharikova, A. Lyashenko, A. Kozlov, V. Pozhar, V. Lomonov, E. Stoĭkova
A method for controlling precisely the intensities of several spectral components of radiation generated by a multiwavelength laser system is described. The method is based on the use of simultaneous Bragg diffraction by a set of acoustic waves of corresponding frequencies and adjustment of their amplitudes. The efficiency of the proposed method is demonstrated by the example of a multiwavelength system based on a pulsed Nd:YAG laser (1064 nm) with intracavity parametric generation of a signal wave (1572 nm) and extracavity light conversion into higher harmonics and sum frequencies. An independent control of intensity ratio for four spectral components in the visible range (452, 532, 635, and 786 nm) is obtained by precisely controlled attenuation of acoustic-wave amplitudes using an original 4-channel acousto-optical polychromator.
本文描述了一种精确控制由多波长激光系统产生的辐射的几个光谱成分强度的方法。该方法基于一组相应频率的声波同时使用布拉格衍射并调节其振幅。基于脉冲Nd:YAG激光器(1064 nm)的多波长系统的实例证明了该方法的有效性,该系统在腔内参数产生信号波(1572 nm)并将腔外光转换为高次谐波和和频率。通过使用原始的4通道声光多色器精确控制声波振幅的衰减,可以独立控制可见范围(452,532,635和786 nm)内四个光谱成分的强度比。
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引用次数: 3
Generation and dynamics of wave packets with a large phase modulation depth 大相位调制深度波包的产生与动态
IF 0.9 4区 工程技术 Q3 Engineering Pub Date : 2022-05-01 DOI: 10.1070/qel18043
A. S. Abramov, I. Zolotovskii, D. Korobko, V. Kamynin, V. Ribenek, A. Fotiadi, V. S. Tsarev
This paper examines the generation of high-frequency picosecond pulse trains as a result of modulation instability of wave packets with a large phase modulation depth and small amplitude modulation depth. We demonstrate that intermediate amplification of such wave packets and subsequent phase-to-amplitude modulation conversion lead to the formation of pulses with peak powers orders of magnitude higher than their initial power. The corresponding pulse generators can be used to generate a line spectrum.
本文研究了由于大相位调制深度和小幅度调制深度的波包调制不稳定而产生的高频皮秒脉冲串。我们证明了这种波包的中间放大和随后的相幅调制转换导致脉冲的形成,其峰值功率比初始功率高几个数量级。相应的脉冲发生器可以用来产生线谱。
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引用次数: 0
High-power quasi-cw semiconductor lasers (1060 nm) with an ultra-wide emitting aperture 具有超宽发射孔径的高功率准连续波半导体激光器(1060nm)
IF 0.9 4区 工程技术 Q3 Engineering Pub Date : 2022-04-01 DOI: 10.1070/qel18014
S. Slipchenko, D. Romanovich, V. Kapitonov, K. Bakhvalov, N. Pikhtin, P. Kop’ev
High-power quasi-cw semiconductor lasers with an emitting aperture 800 μm wide and a continuous p-contact are developed. Laser operation with a pulse duration of 1 ms, a repetition rate of 10 Hz, and a maximum peak power of 87 W at a wavelength 1060 – 1070 nm is demonstrated under pumping by current pulses with am amplitude of 97 A. Experimental estimates show that overheating of the active region at the end of the laser pulse at a current of 97 A may reach 36.7 °C.
研制了发射孔径为800 μm、连续p接触的高功率准连续波半导体激光器。在脉冲振幅为97 a的脉冲泵浦下,脉冲持续时间为1 ms,重复频率为10 Hz,在波长1060 ~ 1070 nm处的最大峰值功率为87 W。实验估计表明,在97 a的电流下,激光脉冲末端的有源区过热可达36.7℃。
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引用次数: 1
Semiconductor laser based on a CdS/ZnSe heterostructure with longitudinal optical pumping by a laser diode 激光二极管纵向光泵浦CdS/ZnSe异质结构半导体激光器
IF 0.9 4区 工程技术 Q3 Engineering Pub Date : 2022-04-01 DOI: 10.1070/qel18016
M. Butaev, V. Kozlovsky, Y. Skasyrsky
An optically pumped semiconductor laser based on a CdS/ZnSe heterostructure containing 10 coupled quantum wells is studied. The structure is grown by metalorganic vapour phase epitaxy on a GaAs substrate. A microcavity with interference dielectric mirrors is fabricated based on this structure. At room temperature under longitudinal pumping by an InGaN/GaN pulsed laser diode with a wavelength of 438 nm, the peak power of the microcavity reaches 100 mW at a wavelength of 508 nm and a pulse duration of 65 ns.
研究了含有10个耦合量子阱的CdS/ZnSe异质结构光泵浦半导体激光器。该结构是通过金属有机气相外延在砷化镓衬底上生长的。在此基础上制备了具有干涉介电镜的微腔。在室温下,在波长为438 nm的InGaN/GaN脉冲激光二极管的纵向泵浦下,在波长为508 nm、脉冲持续时间为65 ns时,微腔的峰值功率达到100 mW。
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引用次数: 3
期刊
Quantum Electronics
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