Anomalous broadening spectra due to isotope effects in the high-power He-CdII white light lasers

Wakao Sasaki; Tatehisa Ohta

doi:10.1117/12.18500

1 June 1990 Anomalous broadening spectra due to isotope effects in the high-power He-CdII white light lasers

Wakao Sasaki, Tatehisa Ohta

Proceedings Volume 1225, High-Power Gas Lasers; (1990) https://doi.org/10.1117/12.18500
Event: OE/LASE '90, 1990, Los Angeles, CA, United States

Abstract

It has been recognized that since the He-CdII lasers are usually operated under considerably high buffer-gas pressure, the oscillation modes in these lasers can automatically reduced by their homogeneous broadening mechanism due to the high buffer-gas pressure. Therefore, it has been expected that the oscillation scheme in these lasers can easily be single-moded when they are operated in high power. We have examined this fact with a most high-power (100mW) He-CdII white light laser which has just come to be commercially available in Japan. As a result, this is true only in the cases of the 537.8 nm and 636.Onm lines, but in the case of the 441.6nm lines an anomalous broadening of the spectral width, which amounts to as much as more than 2GHz has been measured. This degrades the coherence length of this blue line less than 15cm. Such a large broadening can be attributed to the isotopes involved in the natural cadmium metal used for the laser material.

Citation Download Citation

Wakao Sasaki and Tatehisa Ohta "Anomalous broadening spectra due to isotope effects in the high-power He-CdII white light lasers", Proc. SPIE 1225, High-Power Gas Lasers, (1 June 1990); https://doi.org/10.1117/12.18500

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