Abstract
A scheme for obtaining up-conversion lasing without inversion in the visible range is proposed using a Doppler-broadened He-Ne mixture as active medium. We consider a cascade scheme (2s2↔2p2↔1s3) with a frequency up-conversion ratio of 1.91. The upper transition is inverted and driven by an external field and lasing without inversion occurs at 616.4 nm provided that the collisional decay rates of the 1s3 and 1s5 levels overcome a certain threshold.
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42.50.Gy; 32.80.Qk; 42.70.Hj
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Ahufinger, V., Shuker, R. & Corbalán, R. Frequency up-conversion He-Ne laser without inversion. Appl. Phys. B 80, 67–72 (2005). https://doi.org/10.1007/s00340-004-1694-0
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DOI: https://doi.org/10.1007/s00340-004-1694-0