Laser Generation without Population Inversion in the Red Wing of the $${D}_{1}$$ -Line of Alkali Metal Atoms under Resonant Diode Pumping

IF 0.5 Q4 PHYSICS, MULTIDISCIPLINARY

Optoelectronics Instrumentation and Data Processing Pub Date : 2024-03-26 DOI:10.3103/s8756699023060110

A. I. Parkhomenko, A. M. Shalagin

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Abstract

A new method of laser radiation generation without population inversion in the red wing of the $D_{1}$-line of alkali metal atoms under resonant absorption of broadband radiation of pump laser diodes at the $D_{1}$ transition is studied theoretically. The appearance of laser generation is caused by the fact that the probability of stimulated emission in the red wing of the spectral line exceeds the probability of absorption if homogeneous broadening due to interaction between active particles and the buffer gas significantly exceeds the natural broadening (under high pressures of the buffer gas). Analytical formulas representing the operation of a transversely diode-pumped alkali metal vapor laser are obtained. It is found that cesium atoms are the most promising object for observation of laser generation without population inversion in the red wing of the $D_{1}$-line of alkali metal atoms. In a sufficiently long active medium (the length of the medium is 50 times its width), the efficiency of pumping radiation conversion into laser radiation can reach 57% at a buffer gas pressure of 5 atm, a pump diode radiation intensity of 5 kW/cm${}^{2}$, and a half-width of its spectrum of 1 cm${}^{-1}$. The laser radiation frequency can be tuned by several tens of cm${}^{-1}$.

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共振二极管泵浦下碱金属原子{D}_{1}$$线红翼中无种群反转的激光产生

摘要从理论上研究了在$D_{1}$转变处泵浦激光二极管对宽带辐射的共振吸收下，碱金属原子的$D_{1}$-谱线红翼中无种群反转的激光辐射生成新方法。如果活性粒子和缓冲气体之间的相互作用导致的均匀展宽大大超过自然展宽（在缓冲气体的高压下），那么光谱线红翼的受激发射概率就会超过吸收概率，从而产生激光。我们获得了代表横向二极管泵浦碱金属蒸汽激光器运行的分析公式。研究发现，铯原子是观察碱金属原子的$D_{1}$-线红翼中无种群反转激光产生的最有希望的对象。在足够长的活性介质中（介质的长度是其宽度的 50 倍），缓冲气体压力为 5 atm、泵浦二极管辐射强度为 5 kW/cm${}^{2}$、其光谱的半宽为 1 cm${}^{-1}$ 时，泵浦辐射转化为激光辐射的效率可达 57%。激光辐射频率可以调整几十厘米({}^{-1}\)。

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来源期刊

Optoelectronics Instrumentation and Data Processing PHYSICS, MULTIDISCIPLINARY-

CiteScore

1.00

自引率

50.00%

发文量

期刊介绍： The scope of Optoelectronics, Instrumentation and Data Processing encompasses, but is not restricted to, the following areas: analysis and synthesis of signals and images; artificial intelligence methods; automated measurement systems; physicotechnical foundations of micro- and optoelectronics; optical information technologies; systems and components; modelling in physicotechnical research; laser physics applications; computer networks and data transmission systems. The journal publishes original papers, reviews, and short communications in order to provide the widest possible coverage of latest research and development in its chosen field.