Device for Measurement of the Stability of Laser Emission Power

An automated device for determining the stability of the power of continuous laser emission created in accordance with the requirements of the ISO 11554 international standard is considered. The mean value of the measured emission intensity and root-mean-square deviation from this mean value, the maximum and minimum values of the intensity and stability of the emissive power are calculated on the basis of a measurement of the intensity of laser emission expressed in terms of relative units. The measurements are performed for medium-term (1 min) and long-term (60 min) intervals.     

Influence of a Jump in the Power of Laser Radiation on Its Measurement

Simulation and investigation of the effect of an isolated jump on realization of the unit of power of laser radiation and dissemination of the size of the unit are considered. Results are obtained by means of a newly developed algorithm that characterizes the behavior of the mean value of a signal and the standard deviation of a system as functions of the parameters of a jump in the power of laser radiation and the length and amplitude of the jump. If information concerning the time when a jump occurs is available, the proposed algorithm makes it possible to take into account how a jump affects the ultimate result of a measurement.     

Application of Laserstar Power Meter for Determination of the Stability of Laser Radiation Power

The potential for the use of the Laserstar power meter for the determination of the stability of laser radiation power is considered. A relation is established between the discreteness of the reader and the resolution in the determination of the stability of laser power. Examples illustrating the determination of the stability of the radiating power of certain lasers are presented.     

International Intercomparison of Laser Power Measurements in the Visible Region

In this paper we describe results of the international intercomparison of He-Ne and Ar-ion laser power measurements. The intercomparison measurements were of He-Ne laser power of 3 mW at the wavelength of 633 nm and Ar-ion laser power of 200 mW at 488 nm and 515 nm. The participating laboratories coincided within deviation from the average of 0.6 percent at 633 nm, 0.8 percent at 488 nm, and 0.9 percent at 515 nm.     

开关型小功率激光电源

抛弃了传统Ｈｅ──Ｎｅ激光电源的升压方法，采用８０９８单片机的ＰＷＭ输出信号驱动逆变器，并对系统进行全面控制。给出了系统的硬件结构及软件设计。实际应用表明，此电源具有体积小、重量轻、恒流特性好、调节范围宽等特点，极易实现激光电源电路和测量仪器电路的一体化。     

Optothermal Frequency and Power Modulation of Laser Diodes

Abstract

A practical technique is demonstrated for the optothermal modulation of laser diodes, with supporting theory. Thermal power is produced optically by focusing the output of another laser onto the diode output facet. The relative magnitudes of the frequency and power modulation are shown to be sensitive to the position of the heated region, and under appropriate conditions useful frequency modulation amplitudes can be achieved (? GHz) with negligible power modulation.     

半导体激光器输出功率影响因素的研究进展

大功率半导体激光器是现代激光加工设备、激光再制造设备、激光医疗、激光显示以及国防设备中重要的关键基础元器件和核心组件,在工业和国防等领域有着广泛的应用.提高半导体激光器的输出功率首先需要确定影响功率输出的因素,然后通过优化外延材料、芯片结构和制备工艺来解决这些问题.因此,对大功率半导体激光器输出功率影响因素的研究具有重...     

A Method of Transferring the Unit of Power of High-Intensity Laser Radiation

Measurement Techniques - A method is proposed for transferring the unit of mean power of laser radiation by means of measuring high-intensity power (kilowatts), with the possibility of constant...     

激光中功率基准装置的改造

描述了改造后的激光中功率基准装置的原理、结构、性能和不确定度评定     

新型高功率因体激光器电源

用旋转磁通压缩脉冲发电机作为高功率固体激光器电源是一条新的技术路线,该类电源具有小型、机动、灵活、可靠、寿命长等特点。本文通过比较了各种类型脉冲电源的性能指标,解释了旋转磁通压缩、串级、自激、偏极与双机同壳等原理,给出电机的设计公式和一１０ＭＷ串级主动旋转磁通压缩脉冲发电机的设计与实验结果。     

一种测量氦氖激光器功率的新方法

介绍利用照度计测量氦氖激光器功率的新方法。     

神光III强激光能源模块参数设计与保护策略

介绍了神光III预研计划能源模块电路设计方法及参数选择原则 ,详细分析了电源系统可能存在的各种故障情况 ,在此基础上提出了电源系统故障保护的方法和对策 ,这对于电源系统的设计和安全运行具有十分重要的意义。实验结果表明 ,所研制的脉冲电源满足系统要求。     

压电陶瓷驱动电源及其在激光陀螺扫模中的应用

对压电陶瓷微位移器驱动电源与环形激光陀螺腔长调节原理进行了分析 ,在此基础上 ,设计了微机控制 0～ 30 0 V电压连续可调压电晶体驱动电源 ,并将其应用于自行设计的环形激光陀螺自动扫模系统。实验获得的扫模曲线表明 ,该驱动电源能够满足环形激光陀螺扫模系统的要求     

半导体激光器调制驱动电源的研制与实践

目的　为半导体激光器合成外差干涉研制一调制驱动电源 .方法　选用现有大规模集成芯片 ,设计力求简单、实用、成本低及高性能 .结果　利用数码调制驱动芯片线性区实现各种方式的调频是可行的 .结论　该调制驱动电源满足各种波形的合成外差干涉 ,具有广泛的应用价值 .     

Automatic Calibration System for a Laser Power Meter

A microprocessor-based calibration system for a CW laser power meter has been developed. The system consists of an isothermal calorimeter with a thermopile unit, an electrical, and an optical subsystem. Temperature control of the thermopile unit is achieved through a digital technique. The calibration of a power meter is performed using the effective efficiency of the unit as measured by a calorimeter. From error analyses, an overall accuracy has been obtained as ±1 percent in root mean square for a power level of 1 ~ 200 mW.     

高稳定度高功率密度主被动锁模YAG激光器

从理论上和实验上，将一声光驻波调制器插入纯被动锁模ＹＡＧ激光谐振腔内，使其特性显著地改进，即锁模几率达到百分之百，锁模阈值明显地降低，锁模脉冲列的稳定性显然提高。并用雪崩晶体管串供Ｐｏｃｋｅｌ盒选取单脉冲用的高压方波。在此基础上，再经两级激光放大及二、三倍频谐波发生器，研制出一台高稳定度高功率密度主被动锁模ＹＡＧ激光器的超短激光脉冲光源     

功率对304L车板上激光熔覆Fe-Cr层组织和冲蚀性能的影响

在304L不锈钢车板上激光熔覆Fe-Cr层,通过实验测试的手段研究功率对其组织和冲蚀性能的影响。研究结果表明:对熔覆层进行熔覆过程中引起了组织晶化现象,逐渐提高功率后,晶体组织衍射峰也变得更加明显。经过0.5 kW以上功率的激光熔覆层中已基本观察不到层状组织,获得更致密的组织,实现了熔覆层和基体间的冶金结合作用。随着功率的增加,激光熔覆Fe-Cr层的密度表现出单调增加的变化规律。提高激光功率后,获得了更低硬度的熔覆层。通过喷涂工艺制得的熔覆层与基体间形成了机械结合的状态,使界面组织硬度发生快速降低,熔覆层的硬度呈现阶梯降低的变化规律。相对于304L不锈钢,熔覆层试样达到了更低体积磨损率。以更高冲击角进行处理时,可以使砂粒获得更集中的能量,从而更易在熔覆层中产生凹坑和裂纹,从而提高了体积损失率。     

Non-Selective Standard Indicator for the Average Power of Laser Radiation

A technical solution for the average power laser radiation standard applied to the ultraviolet range is suggested and characteristics of the standard are provided.__________Translated from Izmeritelnaya Tekhnika, No. 2, pp. 32–35, February, 2005.     

Measurements of High Power Levels of Laser Radiation by Pass-Through Receivers

Measurement Techniques - The problem of developing measuring instruments for high levels of laser power of the pass-through type was posed and solved. Methods for solving the problem are presented....     

A High Average Power Dye Laser Powered by a Vortex Stabilized Flashlamp

A flashlamp pumped organic dye laser has recently been operated at an average power output of 114 W. This is the highest average power ever reported for a dye laser. The laser was excited by a high power, vortex stabilized flashlamp. In this type of lamp a fast flow of argon gas is injected near the walls. The gas swirls inward and exits through holes in the electrodes. The fast gas flow provides cooling to allow the lamp to operate at high average power and it also stabilizes the position of the discharge. The lamp was used in an elliptical pumping cavity, with the lamp at one focus. The arc length in the lamp was 10 cm. The dye was circulated through a transverse flow channel at the other focus. The lamp was fired at repetition rates up to 357 Hz and with an energy per pulse of 211 J, i.e. an average power of 75 kW. The laser output pulses had a full width at half maximum of 1·8 μ sec. The average power output increased nearly linearly with repetition rate to a maximum of 114 W at 255 Hz. The achievement of even higher powers was limited by the replacement rate of dye in the channel and a drop in the flashlamp intensity at higher repetition rates. The dye used in these experiments was Rhodamine 6G in an ethanol solution.