Erratum to: Optical Gain of 1550-nm Range Multiple-Quantum-Well Heterostructures and Limiting Modulation Frequencies of Vertical-Cavity Surface-Emitting Lasers Based on Them

Optics and Spectroscopy - The name of the seventh author should read L. Ya. Karachinsky.     

Erratum to: Optical Gain of 1550-nm-Range Multiple-Quantum-Well Heterostructures and Limiting Modulation Frequencies of Vertical-Cavity Surface-Emitting Lasers Based on Them

Optics and Spectroscopy - 10.1134/S0030400X18080143     

Design of Long-Wavelength Vertical-Cavity Surface-Emitting Lasers with Resonant Optical Pumping

An optically pumped long-wavelength vertical-cavity surface-emitting laser (VCSEL) with resonant optical pumping has been proposed. The proposed structure enables the dual-resonance of pump light (1300 nm band) and output light (1550 nm band) at the same time. It is shown that high pumping efficiency of ∼99% can be obtained by adjusting the top mirror reflectivity and the cavity length. This dual-resonance VCSEL (DR-VCSEL) may have great advantages of high efficiency pumping, low power consumption and can be fabricated by using conventional VCSEL fabrication techniques with reasonable fabrication tolerances.     

Practical Accurate Optical Ranging Based on Polarization Self Modulation of a Vertical-Cavity Surface-Emitting Laser Diode

A self-mixing type range finder is proposed using the polarization self modulation phenomenon of a vertical-cavity surface-emitting laser diode, in which the polarization mode switches between two inherent modes of the laser diode. The length to be measured is determined from the switching frequency, the accuracy of which is quite excellent with a relative error of less than 10 ppm. Experimental results prove that the present method is feasible as a practical and highly accurate ranging technique.     

Investigation of Anomalous Lasing in Vertical-Cavity Surface-Emitting Lasers of the 850-nm Spectral Range with a Double Oxide Current Aperture at Large Gain-to-Cavity Detuning

Optics and Spectroscopy - Results of investigation of static characteristics of the vertical-cavity surface-emitting lasers (VCSEL) of the 850-nm spectral range based on strained InGaAs/AlGaAs...     

弱光反馈下正交时变光注入VCSEL的双稳特性研究

基于垂直腔面发射激光器(VCSEL)的自旋反转模型(SFM),研究了弱光反馈下正交时变光注入VCSEL的双稳特性。研究结果表明,当副激光器(S-VCSEL)受到主激光器(M-VCSEL)正交时变光注入时,弱光反馈的引入不改变正交时变光注入VCSEL的双稳宽度随光注入扫描速率增大而增大的性质;对于确定的光注入扫描速率,随着反馈强度的增大,双稳宽度将变窄;当M-VCSEL与S-VCSEL之间存在频率失谐Δν(等于νm-νs,νm、νs分别为主、副激光器自由运行时的频率)时,随着Δν从负值逐渐增加到正值,双稳宽度总体呈现先减小后增大的趋势,无反馈时在负频区域双稳环宽度呈现的较大波动在引入光反馈后可得到一定程度的抑制。     

垂直腔面发射激光器中顶层相位对模式特性的影响

研究了垂直腔面发射激光器中不同的顶层厚度对激光器模式特性的影响。结果表明空气界面反射与分布布拉格反射器（ＤＢＲ）的反射率反相时,将导致阈值增益增加几倍,而且模式光场强度在出射端面有反常的增强,但对光场进入分布布拉格反射器的等效厚度影响不大。精确腐蚀顶层厚度可供替调节分布布拉格反射器周期数,以改善器件特性。     

Low-Threshold and High-Power Oxide-Confined 850 nm AlInGaAs Strained Quantum-Well Vertical-Cavity Surface-Emitting Lasers Based on Intra-Cavity Contacted Structure

The low-threshold and high-power oxide-confined 850 nm AlInGaAs strained quantum-well （QW） vertical-cavity surface-emitting lasers （VCSELs） based on the intra-cavity contacted structure are fabricated. The threshold current of 0.1 mA for a 10-μm oxide-aperture device is obtained with the threshold current density of 0.127kA/cm^2. For a 22-μm oxide-aperture device, the peak optical output power reaches to 14.6mW at the current injection of 25 mA under the room temperature and pulsed operation with a threshold current of 2mA, which corresponds to the threshold current density of 0.526kA/cm^2. The lasing wavelength is 855.4nm. The full wave at half maximum is 2.2 nm. The analysis of the characteristics and the fabrication of VCSELs are also described.     

垂直腔面发射激光器的结构生长及特性研究

在偏〈111〉A 2°的GaAs (100) 衬底上生长了Al0.9Ga0.1As /Al0.2Ga0.8As周期结构的垂直腔面发射激光器（VCSEL）外延片P 型DBR的周期数为24.5对,N型DBR的周期数为34.5对.用光荧光 (PL) 谱、扫描电子显微镜 (SEM)和X射线双晶衍射 (XRD) 方法对VCSEL的光学特性和结构特性进行了分析室温量子阱材料的PL谱峰值波长为837.0 nm,半高宽达到28.9 nm在X射线双晶衍射回摆曲线中,除了“0”级衍射峰外,还观察到一级和二级卫星峰.“0”级双晶衍射峰的半高宽为12.56弧秒(″),衬底GaAs的衍射峰半高宽为11.79″.“0”级衍射峰半高宽与衬底GaAs的衍射峰半高宽比较接近,表明晶格具有很高的完整性.实验结果表明腔模波长为837.2 nm,腔模波长与PL谱峰值波长相匹配.     

Optical Gain in Laser Heterostructures with an Active Area Based on an InGaAs/InGaAlAs Superlattice

Optics and Spectroscopy - An active area based on InGaAs/InGaAlAs superlattice for laser diodes operating in the spectral range between 1535 and 1565 nm is proposed and realized practically. It is...     

2.5 GHz Multi-Channels Tunable Wavelength Converter Based on Cross Gain Modulation in Semiconductor Optical Amplifier

Characteristics of 2.5GHz tunable wavelength converter multi-channels in conventional band based on cross gain modulation in a semiconductor optical amplifier are demonstrated.     

Intra-Cavity Holographic Gratings and Lasers with a Controllable Spectrum Based on Them

Optics and Spectroscopy - The comparison of the influence of intra-cavity spectral selectors: static Bragg gratings and dynamic gain gratings, has been presented. It has been shown that their...     

Device Length Dependency of Cross Gain Modulation and Cross Phase Modulation in Semiconductor Optical Amplifier

The cross gain modulation, the cross phase modulation and their recovery time in the SOAs with the various lengths were experimentally investigated. It was found that these values strongly depended on the device length.     

Simulation of Temperature Dependences of Emission Characteristics of Nano-Layer Injection Lasers Based on Symmetric Heterostructures

Russian Physics Journal - The exact problem of electromagnetic wave propagation in a multilayer nanostructure with complex values of dielectric permittivity is solved. The contribution to the...     

Spatiotemporal Dynamics of Broad-Area Lasers with the Pump Modulation and Injection of External Optical Radiation

Radiophysics and Quantum Electronics - We study the possibility of stabilizing broad-area dynamic class B lasers, which include those with periodic pump modulation, by using injection of external...     

光纤中基于互相位调制效应的超短光脉冲对的产生

提出一种在单模光纤正常色散区由连续波产生超短光脉冲对的新方法.即让连续波和一个波长位于光纤负色散区的高阶孤子在光纤中同时传输,互相位调制效应和群速度色散效应的互相作用能使连续波演化成超短光脉冲对.本文还通过计算机模拟,对该方法进行了全面的考察和分析.结果表明,此方法实用且效果较好.     

Synchronization and Coherent Combining of Two Pulsed Fiber Ring Lasers Based on Direct Phase Modulation

We demonstrate a scalable architecture for coherent combining of pulsed fiber ring lasers based on mutual injection and direct phase modulation. By direct phase modulation in the common arm of two ring lasers, synchronous pulsed lasers can be generated and coherent combining of the two synchronous lasers is obtained. Two pulsed fiber ring lasers are coherently combined with 0.55μJ pulse energy and 10 μs pulse duration at a repetition rate of 27.5 kHz. Experimental results show that the two fiber ring lasers are phase locked with an invariable phase difference of π and have good temporal synchronization and spatial coherence. The combining efficiency of the two pulsed fiber laser reaches 90% and the fringe contrast is larger than 40%. Neither active phase control nor polarization control is used in our experiment and this method can be extended to combine more beams and higher repetition rate scaling up to higher power.     

Measurements of Optical Signals and Their Spectra in the Femtosecond Range with Additional Phase Modulation

A solution to the phase problem in optics is considered within the context of the analysis of signals changing in time and of the effect of an object under investigation on the probing radiation. The solution is based on the use of a twin-wave interferometer with phase modulation in one of the channels and a spectrometer. The analysis is concerned, in particular, with signals and processes of ultrashort duration. To shift the frequency in the interferometer channel, an electrooptical crystal of ferroelectric perovskite is used as the modulator. Errors of amplitude and phase structures determined are analyzed.     

基于非线性频率调制的光脉冲压缩反射测量方案

为了克服线性调频技术中的旁瓣过高的缺点,提出一种基于非线性调频技术的光脉冲压缩反射仪方案.将非线性调频脉冲信号通过单边带调制器调制到光信号上,并将光电探测器接收到的瑞利散射、端面反射等信号和该非线性调频脉冲信号进行匹配滤波,得到脉冲压缩曲线.理论、数值仿真和实验证明了非线性调频技术能有效抑制光脉冲压缩反射仪中的旁瓣.实验结果表明,使用相干长度为2km的光源,该方案的测量距离可达5.4km、空间分辨率达16.5cm、非线性调频的旁瓣抑制比比线性调频高5.8dB.