Generation of ultrashort far-infrared laser pulses optically pumped with truncated hybrid-10 um-CO2 laser pulses

D. P. Scherrer

doi:10.1117/12.2297763

1 October 1991 Generation of ultrashort far-infrared laser pulses optically pumped with truncated hybrid-10 μm-CO₂ laser pulses

D. P. Scherrer

Author Affiliations +

Proceedings Volume 1576, 16th International Conference on Infrared and Millimeter Waves; 15761E (1991) https://doi.org/10.1117/12.2297763
Event: 16th International Conference on Infrared and Millimeter Waves, 1991, Lausanne, Switzerland

Abstract

The generation of ultrashort far- infrared laser pulses is of interest for applications in solid state physics, plasma physics and also for the understanding of fundamental processes occuring on a short-time scale in far-infrared gas lasers. However, far-infrared lasers are generally low-pressure narrow-band systems which implies that in this wavelength range short pulses cannot be produced by conventional means. We therefore investigate the generation of ultrashort far-infrared pulses with laser gases which emit by coherent processes such as superradiance or Raman emission.¹ In the process of superradiant emission² the atoms are coupled together by their common radiation field, and thus decay cooperatively. For a number N of emitting atoms or molecules the pulse intensity is therefore proportional to N² and the pulse duration to 1/N. Since N can be large, this process offers the possibility of producing intense short pulses. In the case of Raman emission³ the pulse can be shorter than the inverse linewidth of the transition if the pump pulse is broad band. Hence, the pulse duration is determined by the larger of either the pump-pulse bandwidth or the laser linewidth.

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D. P. Scherrer "Generation of ultrashort far-infrared laser pulses optically pumped with truncated hybrid-10 μm-CO₂ laser pulses", Proc. SPIE 1576, 16th International Conference on Infrared and Millimeter Waves, 15761E (1 October 1991); https://doi.org/10.1117/12.2297763

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KEYWORDS

Optical pumping

Carbon dioxide lasers

Infrared radiation

Raman spectroscopy

Gases

Infrared lasers

Laser optics

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