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This article is cited in 2 scientific papers (total in 2 papers)
Phase transitions in formation of spatially coherent laser beams
V. B. Pakhalov, A. S. Chirkin
Abstract:
The results are reported of an investigation of the changes in the spatial coherence (correlation) radius $r_c$ and radiation intensity $I$ on approach to the laser threshold. It is shown that their behavior obeys the laws $r_c\propto(\delta-\delta_{\text{th}})^{-\alpha}$ and $I\propto(\delta-\delta_{\text{th}})^{-\beta}$ where $\delta_{\text{th}}$ is the threshold value of the losses at which stimulated emission begins; $\alpha$ and $\beta$ are the critical exponents. It is reported that measurements carried out on an He–Ne laser give $\alpha=0.49\pm0.05$ and $\beta =0.9\pm0.2$. These values of $\alpha$ and $\beta$ are in agreement with the theory of formation of spatially coherent beams in lasers based on the wave approach ($\alpha=0.5$, $\beta=1.0$). The agreement of the experimental results with the Landau theory of phase transitions of the second kind is discussed.
Received: 23.07.1976
Citation:
V. B. Pakhalov, A. S. Chirkin, “Phase transitions in formation of spatially coherent laser beams”, Kvantovaya Elektronika, 4:6 (1977), 1268–1275 [Sov J Quantum Electron, 7:6 (1977), 715–719]
Linking options:
https://www.mathnet.ru/eng/qe12880 https://www.mathnet.ru/eng/qe/v4/i6/p1268
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Abstract page: | 154 | Full-text PDF : | 156 |
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