二千瓦级横向电激励CO_2连续激光器

我们研制的HGL-81型CO_2激光器输出功率达2千瓦以上,连续工作时间2小时以上,输出功率稳定度小于±5％,电光转换效率大于11％。 HGL-81型CO_2激光器采用的总体技术方案是工作气体快速流动,横向电激励、高气压、多针-板自持放电。工作气压范围为50～300托。提高工作气压的好处是:激光输出功率随气压增加而增加,有利于长时间、全封闭稳定工作,工作过程中不需要补充新鲜气体,纵模稳定;气体质量流量大,气体温度低等。提高工作气压带来的主要问题是辉光放电的不稳定性。我们采用多针-板放电结构较好地解决了这个问题。     

横流CO_2激光器的二维增益分布

用一维气流、准二维放电模型算出垂直于电极平面的等增益线二维分布。研究了放电区气体流速、放电参数以及气体成分等对小信号增益沿流动方向变化规律的影响。对于每一气体压力,有与最佳增益曲线对应的流速范围。将计算结果与实验结果进行了比较。     

自持电激励横流CO_2激光器的最佳输出功率

本文研究了横流CO_2激光器电激励区的形状、光腔位置、反射镜的大小、耦合度、介质流速诸因素对输出功率的影响,得到了一批规律性的结果,可为实验研究和器件设计提供参考。     

约束放电激励千瓦级基模CO2激光器增益分布的测量

利用放大法进行约束放电激励千瓦级基模CO2激光器增益的测量,分析增益区的横向分布,得知此种激光器的增益值较高,增益区宽(与同类横流激光器进行比较),适合使用多折腔,并获得了优良的激光模式输出。     

约束放电激励千瓦级基模CO2激光器

本文研究了约束放电激励千瓦级基模CO2激光器。约束放电激励的思想核心是:利用正交或基本正交的电场或者电磁场在阴极位降区附近形成对带电粒子的捕集阱,由此产生对放电过程中从阴极发出的带电粒子的约束作用从而影响整个气体放电激励过程。     

单放电盒5kW横流CO2激光器气体流动特性研究

为了解决传统双放电盒横流5kW CO2 激光器双风道、风速小、体积庞大等问题,研究开发了单放电盒横流5kW CO2 激光器,采用气体动力学、放电区气体流场分析的方法,在保证风机强度的前提下根据通风机原理设计了一款铝质轻型离心风机,风机的进口直径为382mm,出口直径为451mm,蜗壳宽度为160mm,并进行了实验验证。结果表明,配置该风机的单放电盒的5kW CO2激光器提高了功率稳定性,放电区气体平均流速从60.8m/s提高到75.5m/s,缩小了弧光放电的面积,改善了近场光斑的强度及均匀性,采用铝制风机及单放电盒减小了激光器的整体重量和体积。这对CO2激光器向高功率、小体积、紧凑型发展具有重要意义。     

Fast axial flow CO2 laser excited by silent discharge

A fast axial flow CO₂ laser excited by silent discharge has been developed. With a new electrode system applied to the laser, homogeneous discharge of power density of up to 80 W/cm³ is obtained without applying any stabilization techniques on the discharge. An output laser power of 920 W in stable TEM₀₀ mode operation is attained with an efficiency of over 14%. Beam fluctuation common to fast axial flow lasers is suppressed by the combination of smooth gas flow and low CO₂ molar fraction     

强红外CO_2激光场中乙醇分子的离解特性

实验研究了乙醇分子的红外多光子离解特性。给出了离解速率与激光频率、激光能量、激光脉冲数、温度、初始气压的关系。离解阈值约为1.8焦耳/厘米~2,观测到离解速率的极大值相对于其线性吸收峰向长波方向位移约8厘米~(-1)。     

Optical gain and saturation intensity in a transverse-flow CW CO2 laser

Simple expressions for the small-signal gain and the saturation intensity in a transverse-flow CW CO₂ laser have been derived considering the effect of gas flow and the finite time required for N ₂ molecule to transfer its energy to CO₂ molecules. These expressions provide estimates of these parameters fairly close to the experimentally measured values in high-power transverse-flow CW CO₂ lasers     

射频激励大面积放电CO2激光器的进展

本文评述了扩散冷却式射频(RF)激励大面积放电CO2激光技术的进展,讨论了这一技术与非稳-波导混合腔结合的优越性,展望了这种激光器的发展前景。     

横流针板放电CO_2激光器的理论计算模型

本文考虑了电子密度、电子温度、气流速度、气温、弛豫及激发速率等重要物理量沿流向的分布。给出了横流针板放电CO_2激光器特性参量的理论计算模型。用该模型对MGL-84型激光器的增益、输出功率和效率进行了计算,其结果与实验结果较吻合。     

高效率横向电激励连续CO_2激光器的研究

报道一种工业用高气压封闭形横向电激励二千瓦级连续CO_2激光器。连续运行13小时,输出功率高于2.3kW,能量转换效率大于17％。研究了放电特性、输出特性;测量了在不同放电条件下的电子温度和电子浓度。     

横流放电CO_2激光器能量转换的特性和机制

模拟计算分析了横流放电CO_2激光器中介质气压、流速、光腔位置、腔中辐射强度、输出耦合度等因素对介质各能态间能量转换特性的影响.     

横流CO_2激光器小信号增益顺流分布的解析解

本文利用一个简化模型,在推导出电子分布函数的基础上,给出了横流CO_2激光器小信号增益沿气流方向分布的近似表达式,导出了小信号增益与顺流位置、气流速度、气压、顺流电极长度、放电电流之间的关系。理论与实验基本符合。     

Transverse mode propagation and gain coefficients in a planarwaveguide CO2 laser amplifier

The transverse mode propagation and amplification characteristics of a large electrode area, planar waveguide carbon dioxide laser amplifier have been investigated. Amplification of an imperfectly mode-matched input produces varying output beam quality with changing discharge conditions, through the modification of the propagation constants of the waveguide modes by the gas thermal lens. For improved mode-matching to the amplifier, a near ideal TE₁ output is obtained without discharge-induced variations. The maximum gain coefficient for propagation in the fundamental mode is shown to be dependent on the radio frequency discharge conditions through the frequency dependence of the minimum stable power density. At 81 MHz, a gain coefficient of 0.65 m^-1 at 50 torr pressure is obtained     

高频激励横流CO2激光器的实验研究

本文在实验上在气压为120mba、100mba和80mba,气压比为CO2:N2:Ar=7:46.5;46.5,间隙为20mm,26mm和27mm,电极直径为12mm、长为700mm的情况下,对网络的高频传输特性,间隙高频放电的伏安特性及激光功率输出特性进行了一定的研究,在国内首次得到高频激励横流CO2激光器400W的激光输出.注入功率密度达20W/cm3,与相同条件下的直流针板式激光器相比最大注入功率提高了约一倍,最大电光转换效率为9%.     

1kW无氦横流连续CO_2激光器的研究

本文报道我们研制的 Ikw无 He横流连续CO_2激光器的实验结果。激光器总体结构如图1所示。其放电装置采用针板放电结构，阴极由152根直径为      

High homogeneity gain distribution in a cross flow AC excited CO2 laser

Gain measurements at 10.6 μm, performed on an alternating-current-excited CO₂ laser discharge, are presented. The discharge occurred between individually ballasted p-i-n electrodes. The values of the ballast capacitors were arranged in order to obtain a stable discharge as well as an almost uniform gain distribution through all of the discharge section. The results show that an appropriate distribution of the specific power density into the active medium volume can produce a stable discharge as well as good uniformity of the small-signal gain in the discharge cross section. The downstream small-signal gain, however, decreases slightly, despite a higher excitation rate, due to a higher temperature and an increased thermal population of the lower laser level. The rather high values of the small signal gain, even in the high excitation region, offer promise of good beam quality and high efficiency     

TEA CO2激光器放电参数的计算及测量

本文针对Blumine型激励电路,对TEACO2激光器的充电过程、预电离过程和主放电过程的电路参数作了理论计算,并通过实验测量了这些参数。理论与实验很好地吻合。