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Biharmonic pumping in dye lasers with distributed feedback

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Conclusions

We have shown that biharmonic pumping can effectively excite traveling population gratings in an active medium when mΩ <(Wo/2 +1/T1), and temperature gratings if mΩ <(τ0xm)−1. As the order m increases the population-grating excitation efficiency decreases, while that of the temperature gratings may either increase or decrease. The times taken for the thermal and resonance processes which form the gratings to build up are given by the expressions t=τ0xm, t =T1/(1 +W0T1/2), respectively. In this case distributed feedback is formed by a thermal mechanism if (14) is satisfied, and by resonance mechanism if the opposite inequality is satisfied. The self-excitation threshold over a wide range of parameters depends logarithmically on the amplitude of the grating forming the distributed feedback. Hence, for a comparatively small excess of the threshold, self-excitation of a laser with distributed feedback is possible over a wide spectrum. Thus, for double excess of the self-excitation threshold and T1 =10−9 sec, η =1, and H =8 lasing over a wide spectrum of ≈10 cm−1 is possible.

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Authors
  1. V. A. Batyrev
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  2. M. V. Korl'kov
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Additional information

Translated from Zhurnal Prikladnoi Spektroskipii, Vol. 40, No. 2, pp. 195–202, February, 1984.

We wish to thank A. A. Afanasev and P. A. Apanasevich for useful discussions.

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Batyrev, V.A., Korl'kov, M.V. Biharmonic pumping in dye lasers with distributed feedback. J Appl Spectrosc 40, 135–141 (1984). https://doi.org/10.1007/BF00660246

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  • DOI: https://doi.org/10.1007/BF00660246

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