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物理学报. 1978, 27(4): 383-395.
doi: 10.7498/aps.27.383.
CO2激光脉宽的“流动加宽”——高气压快速流脉冲激励准连续输出CO2激光器研究
- 收稿日期: 1977-08-29
- 刊出日期: 1978-02-05
摘要: 本文提出CO2激光脉冲宽度的“流动加宽”问题,阐明了“流动加宽的条件、特点和要求,光腔安置在放电区下游、或部分与放电区重叠并延伸到下游。流动的技术能够把激光的脉宽“加宽”到约大于气流通过放电区的时间即渡越时间,这是“加宽”脉宽的上限。给出无光辐射时问题的解析解,讨论了增益特性;利用文献[18,19]的理论计算了功率和效率。小信号增益系数每厘米约为千分之几—百分之几,能量效率5—15％,讨论了气体组分比、气压对功率和效率的影响。
English Abstract
“FLOW-STRETCHING”OF PULSES IN PULSED CO2 LASERS——A STUDY OF HIGH PRESSURE,FAST SPEED FLOW,PULSE EXCITED AND QUASI CONTINUOUS OUTPUT CO2 LASERS
- Received Date:
29 August 1977
- Published Online:
05 February 1978
Abstract: A pulse "flow-stretching" technique is suggested in an attempt to increase pulse width in the CO2 lasers. The conditions, characteristics and requirements of pulse flow-stretching are elucidated. Optical cavity is located on the downstream of the dis-charge region, or they may be partly overlapped. The pulse width so broadened could be just greater than the time required for the stream to cross over the discharge region. This is an upper limit of pulse stretching. The analytical solution for non-equilibrium relaxation processes without radiation is obtained. The small-signal gain characteristics is presented. By utilizing the theory given in the articles[18,19], we have calculated the power output and the efficiency. The small-signal gain is in the range of nearly a few thousandth to a few hundredth per centimeter and energy efficiency, 5-15%. Influences of gas composition and pressure on the power output and effici-ency have been considered.
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