Two-level gas laser with transverse diode pumping

IF 0.9 4区 工程技术 Q3 Engineering Quantum Electronics Pub Date : 2022-05-01 DOI:10.1070/QEL18038
A. Parkhomenko, A. Shalagin
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引用次数: 1

Abstract

We theoretically study a new method for generating laser radiation by a two-level system without population inversion in the ‘red’ wing of its spectral line under resonant absorption of broadband radiation from pump laser diodes. A two-level system simulates the atoms of an active gas in an atmosphere of a high-pressure buffer gas. The effect results from the fact that in the ‘red’ wing of the spectral line, the probability of stimulated emission exceeds the probability of absorption if the homogeneous broadening due to the interaction of particles with the buffer gas significantly exceeds the natural one (at high pressures of the buffer gas). Analytical formulae are obtained that describe the operation of a two-level gas laser with transverse diode pumping. It is found that the longer the active medium, the higher the buffer gas pressure and pump radiation intensity, and the smaller the width of the pump radiation spectrum, the greater the efficiency of conversion of pump radiation into laser radiation. In a sufficiently long active medium (the length of the medium is 50 times its width), the conversion efficiency can reach 44 % at a buffer gas pressure of 5 atm, a pump diode radiation intensity of 3 kW cm−2, and a half-width of its spectrum of 1 cm−1. A two-level gas laser with transverse diode pumping is capable of generating continuous optical radiation with a very high (up to 100 kW) power. The frequency of laser radiation can be tuned by several tens of cm−1.
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具有横向二极管泵浦的二能级气体激光器
我们从理论上研究了一种共振吸收泵浦激光二极管宽带辐射的双能级系统产生激光辐射的新方法,该方法在其光谱线的“红”翼没有人口反转。两能级系统模拟高压缓冲气体大气中活性气体的原子。这种效应是由于在光谱线的“红色”翼中,如果粒子与缓冲气体的相互作用引起的均匀展宽明显超过自然展宽(在缓冲气体的高压下),则受激发射的概率超过吸收的概率。得到了描述横向二极管抽运的两能级气体激光器工作的解析公式。研究发现,活性介质越长,缓冲气体压力和泵浦辐射强度越高,泵浦辐射光谱宽度越小,泵浦辐射转化为激光辐射的效率越高。在足够长的有效介质中(介质长度为介质宽度的50倍),当缓冲气体压力为5atm,泵浦二极管辐射强度为3kw cm−2,其光谱半宽为1cm−1时,转换效率可达44%。具有横向二极管泵浦的两能级气体激光器能够产生非常高(高达100千瓦)功率的连续光辐射。激光辐射的频率可以调谐到几十厘米−1。
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来源期刊
Quantum Electronics
Quantum Electronics 工程技术-工程:电子与电气
CiteScore
3.00
自引率
11.10%
发文量
95
审稿时长
3-6 weeks
期刊介绍: Quantum Electronics covers the following principal headings Letters Lasers Active Media Interaction of Laser Radiation with Matter Laser Plasma Nonlinear Optical Phenomena Nanotechnologies Quantum Electronic Devices Optical Processing of Information Fiber and Integrated Optics Laser Applications in Technology and Metrology, Biology and Medicine.
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