A Narrow Line Width Tunable Diode Laser System

ＡＮａｒｏｗＬｉｎｅＷｉｄｔｈＴｕｎａｂｌｅＤｉｏｄｅＬａｓｅｒＳｙｓｔｅｍＷＡＮＧＸｉｎｑｉＷＡＮＧＹｕｚｈｕ（ＬａｂｏｒａｔｏｒｙｆｏｒＱｕａｎｔｕｍＯｐｔｉｃｓ，ＳｈａｎｇｈａｉＩｎｓｔｉｔｕｔｅｏｆＯｐｔｉｃｓａｎｄＦｉｎｅＭｅｃｈａｎｉｃ...     

THERMAL INSTABILITY OF D-T BURNING PLASMAS

ＴＨＥＲＭＡＬＩＮＳＴＡＢＩＬＩＴＹＯＦＤ－ＴＢＵＲＮＩＮＧＰＬＡＳＭＡＳ￥Ｂ．Ｒ．ＳＨＩＹ．Ｘ．ＬＯＮＧＨ．Ｇ．ＺＨＡＯ（ＳｏｕｔｈｗｅｓｔｅｒｎｉｎｓｔｉｔｕｔｅｏｆＰｈｙｓｉｃｓ，Ｐ．Ｏ．Ｂｏｘ４３２，Ｃｈｅｎｇｄｕ６１００４１，Ｓｉｃｈｕａｎ...     

NEOCLASSICAL TRANSPORT IN A TOKAMAK WITH ELECTRIC SHEAR

ＮＥＯＣＬＡＳＳＩＣＡＬＴＲＡＮＳＰＯＲＴＩＮＡＴＯＫＡＭＡＫＷＩＴＨＥＬＥＣＴＲＩＣＳＨＥＡＲＷＡＮＧＺｈｏｎｇ ｔｉａｎ1,ＧＬｅＣｌａｉｒ2(1.ＳｏｕｔｈｗｅｓｔｅｒｎＩｎｓｔｉｔｕｔｅｏｆＰｈｙｓｉｃｓ,Ｃｈｅｎｇｄｕ610041;2.ＣｅｎｔｅｒＣａｎａｄｉｅｎｄｅＦｕｓｉｏｎＭａｇｎｅｔｉｑｕｅ,Ｃａｎａｄａ)　　Ａｂｓｔｒａｃｔ:Ｎｅｏｃｌａｓｓｉｃａｌｔｒａｎｓｐｏｒｔｔｈｅｏｒｙｆｏｒａｔｏｋａｍａｋｉｎｔｈｅｐｒｅｓｅｎｃｅｏｆａｌａｒｇｅｒａｄｉａｌｅｌｅｃｔｒｉｃｆｉｅｌｄｗｉｔｈｓｈｅａ…     

A Two-layer Intrinsically Fuzzy Morphology Image Processor Architecture

ＡＴｗｏ－ｌａｙｅｒＩｎｔｒｉｎｓｉｃａｌｌｙＦｕｚｚｙＭｏｒｐｈｏｌｏｇｙＩｍａｇｅＰｒｏｃｅｓｓｏｒＡｒｃｈｉｔｅｃｔｕｒｅ￥ＳＨＡＯＬａｎ；ＬＩＵＬｉｒｅｎ；ＬＩＧａｕｏｑｉａｎｇ（ＳｈａｎｇｈａｉＩｎｓｔｉｔｕｔｅｏｆＯｐｔｉｃｓａｎｄＦｉｎ...     

High Reflection Ge_(0.45)Te_(0.55) Recording Films

ＨｉｇｈＲｅｆｌｅｃｔｉｏｎＧｅ０．４５Ｔｅ０．５５ＲｅｃｏｒｄｉｎｇＦｉｌｍｓＬＩＵＨｕｉｙｏｎｇＪＩＡＮＧＦｕｓｏｎｇＭＥＮＬｉｑｉｕＦＡＮＺｈｅｎｇｘｉｕＧＡＮＦｕｘｉ（ＳｈａｎｇｈａｉＩｎｓｔｉｔｕｔｅｏｆＯｐｔｉｃｓ＆ＦｉｎｅＭｅｃｈａｎｉ...     

HMO in geometrical optics

ＨＭＯｉｎｇｅｏｍｅｔｒｉｃａｌｏｐｔｉｃｓ￥ＧＵＯＨｏｎｇ；ＬＩＮＴａｏ；ＷＡＮＧＧａｎｇ；ＺＨＡＮＧＹｕａｎｓｈｅｎｇ；ＤＥＮＧＸｉｍｉｎｇ（１．ＮａｆｉｏｎａｌＬａｂｏｒａｔｏｒｙｏｎＨｉｇｈＰｏｗｅｒＬａｓｅｒａｎｄＰｈｙｓｉｃｓ，Ｓｈａｎｇ...     

A STATISTICAL THEORY FOR THE BIO-PHOTON EMISSION OF THE LIVING SYSTEMS

ＡＳＴＡＴＩＳＴＩＣＡＬＴＨＥＯＲＹＦＯＲＴＨＥＢＩＯ－ＰＨＯＴＯＮＥＭＩＳＳＩＯＮＯＦＴＨＥＬＩＶＩＮＧＳＹＳＴＥＭＳＰａｎｇＸｉａｏｆｅｎｇＩｎｔｅｒｎａｔｉｏｎａｌＣｅｎｔｒｅｆｏｒＭａｔｅｒｉａｌＰｈｙｓｉｃｓ，ＡｃａｄｅｍｉａＳｉｎｉｃａＤ...     

STRUCTURES AND INTERNAL MOTION OF A Ne_3 CLUSTER

ＳＴＲＵＣＴＵＲＥＳＡＮＤＩＮＴＥＲＮＡＬＭＯＴＩＯＮＯＦＡＮｅ３ＣＬＵＳＴＥＲＸｉｅＷｅｎｆａｎｇＣｈｅｎＣｈｕａｎｙｕＤｅｐａｒｔｍｅｎｔｏｆＰｈｙｓｉｃｓ，ＧｕａｎｇｚｈｏｕＴｅａｃｈｅｒｓ′ｃｏｌｅｇｅＧｕａｎｇｚｈｏｕ５１０４００ＡＢＳＴ...     

PUSHING THE ENVELOPE IN RAMAN SPECTROSCOPY

ＰＵＳＨＩＮＧＴＨＥＥＮＶＥＬＯＰＥＩＮＲＡＭＡＮＳＰＥＣＴＲＯＳＣＯＰＹＧ．Ｄ．Ｐｉｔｔ（ＵｎｉｖｅｒｓｉｔｙｏｆＬｅｅｄｓａｎｄＲｅｎｉｓｈａｗｐｌｃＵ．Ｋ）ＮｅｗｔｅｃｈｎｉｑｕｅｓｈａｖｅｂｅｅｎｄｅｖｅｌｏｐｅｄｆｏｒＵＶＲａｍａｎｍｉｃｒ...     

A Optical Scheme for Parallelly Realizing the Morphological Erosion of 1－D Gray Images

Ａ　Ｏｐｔｉｃａｌ　Ｓｃｈｅｍｅ　ｆｏｒ　Ｐａｒａｌｌｅｌｌｙ　Ｒｅａｌｉｚｉｎｇ　ｔｈｅ　Ｍｏｒｐｈｏｌｏｇｉｃａｌ　Ｅｒｏｓｉｏｎ　ｏｆ　１－Ｄ　Ｇｒａｙ　ＩｍａｇｅｓＡＯｐｔｉｃａｌＳｃｈｅｍｅｆｏｒＰａｒａｌｌｅｌｌｙＲｅａｌｉｚｉｎｇｔｈｅ...     

大口径薄片激光器失调输出特性

对大口径的薄片激光器的失调输出特性进行了理论和实验研究,V-型腔由平面输出耦合镜和凹面反射镜及孔径光阑组成。基于矩阵光学和失调衍射积分方程得到了激光器的功率失调曲线。实验测量了在200 Hz泵浦频率下加入不同孔径光阑后谐振腔失调对输出功率的影响和谐振腔失调对光束质量的影响,以及在300 Hz泵浦频率下输出功率分别与平面输出耦合镜和凹面反射镜失调的关系。实验结果表明:失调输出功率和失调角度成二次函数关系,失调容限和腔镜口径成正比,光束质量因子随失调角度的增大而变小。     

Design of SMMW Laser Resonators with On-Axis Signal and Pump Beam Guiding in a Mirror Ring

A ring resonator design for optically pumped submillimeter wave (SMMW) lasers using the same set of four mirrors (including one focussing mirror) for pump beam and SMMW beam guiding is introduced.The optimum design is discussed on the example of a 2.523 THz methanol laser. It turns out that the focal length of the focussing mirror has to be adapted to the resonator perimeter. Eleven well suited focal length - resonator perimeter ratios, defining eleven standard resonator configurations, can be distinguished.The setup of an experimental laser with the optimized resonator and the experimental setup to measure laser performance are described, and results concerning laser output power, beam quality and efficiency are discussed.This paper is the extended version of the paper presented on the 23rd International Conference in Colchester [1] and continues a former article presented in this journal [2].     

High beam quality in a HyBrID copper laser operating with an unstable resonator made of a concave mirror and a plano-convex BK7 lens

This paper presents a very simple unstable resonator, made of a concave mirror (total reflector) and a bare plane–convex BK7 lens working as a convex coupling mirror, which is quite efficient for HyBrID copper laser. In addition to a good quality factor (M²=4.9), experimental results showed that it is possible to control the laser output power by introducing a variable aperture iris inside the cavity, close to the coupling lens, without spoiling beam quality. A rough theoretical model helped to explain these results as a combined effect of unstable resonator plus radial gain distribution.     

A Novel Smith-Purcell FEL

A novel Smith-Purcell FEL with a relativistic electron beam of middle energy and a quasi-optical resonator composed of diffraction grating and three mirror reflector is described in this paper. Coherent radiation with peak power of tens of KW at 3 mm waveband is successfully detected from an experimental facility characterized by beam energy of 400-500 KeV, pulse length of 70 ns, pulse beam current of 0.2 KA, and pulse guide magnetic field of up to 1.2 T.     

Properties of a laser beam generated from an axicon resonator

A high power cw CO₂ laser beam is generated from a resonator configuration having an axicon mirror as its end reflector. The properties of this beam are evaluated in terms of its polarization, focusing capability and temporal stability and the resulting effects on processing materials are presented. A comparison is made between a folded and a straight resonator having a spherical focusing mirror as its end reflector.     

角锥阵列改善固体热容激光器光束质量

 为改善光束远场质量,探索研究了角锥反射器的应用,利用角锥棱镜的准相位共轭特性,将角锥棱镜阵列作为热容激光器的后腔镜,抑制腔内波前畸变,并通过数值模拟计算对角锥阵列的单元边长进行优化设计。实验结果表明:角锥阵列对光束远场质量有明显的改善,当角锥阵列的单元边长为4 mm时,实现光束远场7倍衍射极限输出。     

射频激励相移阵列谐振腔波导CO2激光器输出特性研究

为保持器件结构紧凑型的同时获得稳定的高功率、高光束质量激光输出,将相移光学阵列谐振腔技术用于射频激励扩散型冷却板条波导CO₂激光器．实验发现,该设计方案虽然波导结构为矩形宽波导,但是由于采用了具有相移阵列结构的全反射镜,获得的激光束输出空间分布具有阵列输出光束的基本特征．在波导截面为1mm×20mm、增益介质长度为20cm的波导结构条件下,获得了46W的激光功率输出和11.3%的电光转换效率．激光束输出的远场空间分布呈空间压缩的极锐单峰．由于该结构具有的选模特性,远场为单峰空间分布特 关键词：     

射频激励相移阵列谐振腔波导CO2 激光器输出特性研究

In this paper, an optical array resonator with phase-shifting end mirror has been combined with the RF-excited diffusively cooled slab waveguide CO₂ lasers to obtain a desirable output laser beam with single-peaked far-field intensity distribution, which is highly spatially suppressed with the merits of high brightness and good characteristics of propagation. In the experiments, a maximum output power of 46 W and highest conversion efficiency of 11.3% have been obtained from a 200-mm-gain-length device. The laser beam intensity distribution acquired has similar characteristics to the ouptut beam from laser arrays due to the periodical structure of the phase-shifting total reflector, and has an excellent stability due to the mode-selection capability of this type of resonator. In this paper, theoretical analysis is also given, based on which corresponding theoretical model is established, the practical feasibility is shown, and the laser beam output with characteristics of in-phase array mode is predicted. The systematical experimental investigation indicates the prominent influence of the parameters of the phase-shifting array end mirror on the property of the output beam. Furthermore, the manufacturing errors of the phase-shifted array resonator are analyzed and the analysis provides a theoretical guide to the design of this type of lasers.     

束旋转90°对束变换环孔腔输出性能的影响

 使用积分方法和差分方法结合的快速计算方法，在实际燃烧驱动氟化氢化学激光器增益介质沿径向分布不均匀的情况下，考虑在光束变换环形孔径激光谐振腔的紧束段引入光束旋转90°对其输出性能的影响。计算结果显示：在无腔失调的情况下，在紧束段引入光束旋转对束变换环孔激光谐振腔输出功率及光束质量的改善并不显著；在存在腔失调的情况下，紧束段光束旋转对于输出功率和光束质量的改善有显著效果。     

猫眼激光谐振腔横模选择特性研究

将猫眼逆向器作为激光谐振腔的一个腔镜组成猫眼谐振腔。介绍了猫眼逆向器的结构,阐述了猫眼逆向器中凸透镜和凹面镜的间距改变时猫眼曲率半径的相应变化,并通过有效地控制该间距来选择激光横模,从而保证基横模输出。在激光谐振腔衍射积分方程的基础上,运用牛顿柯特斯数学方法,对不同参量下的猫眼激光谐振腔的横模状况进行分析,得出了各阶横模对应的特征值和功率损耗,计算出保证基横模输出的参量,并与实验对比,得到了一致的结论,为激光器的横模选择和控制提供了一种简便易行的新方法。