Spectroscopy With Visible And Far-Infrared Lasers

Martin Gundersen

doi:10.1117/12.954866

30 December 1976 Spectroscopy With Visible And Far-Infrared Lasers

Martin Gundersen

Proceedings Volume 0082, Unconventional Spectroscopy; (1976) https://doi.org/10.1117/12.954866
Event: 20th Annual Technical Symposium, 1976, San Diego, United States

Abstract

A discussion of several spectroscopic techniques using two lasers for semiconductor impurity studies is presented. The frequency of one laser is in or near the visible and the other in the far-infrared (10 to 100 microns). The second infrared laser offers several possibilities for spectroscopy in addition to the usual laser properties of high intensity, monochromaticity, and coherence. For example, an infrared laser frequency can be selected which is resonant with or near a donor, acceptor, or exciton (intrinsic or bound) binding energy in a semiconductor. The infrared laser then provides an intense and very precise probe, the effect of which may be studied in the fluorescence or absorption spectra produced by the visible laser. This might be compared to a temperature dependent fluorescence study, with the difference being that a broad thermal effect is replaced by a sharp photodissociative or optical pumping effect produced by the infrared laser. This has application to learning the role of specific impurities in recombination in devices such as an LED.

Citation Download Citation

Martin Gundersen "Spectroscopy With Visible And Far-Infrared Lasers", Proc. SPIE 0082, Unconventional Spectroscopy, (30 December 1976); https://doi.org/10.1117/12.954866

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