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Ground state ESR measurements of ruby during laser action

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2 Author(s)
Igarashi, T. ; Radio Research Lab., Ministry of Post and Telecommunication, Tokyo, Japan ; Szabo, A.

The use of electron spin resonance for measurement of the ground state population (GSP) of Cr3+in a ruby rod during optical pumping is described. For a 7.7 cm long rod at 90°K and a mirror reflectance product R_{1}R_{2} > 0.08 , the GSP at laser threshold was found to be 55 ± 5 percent in good agreement with theory and previous optical measurements. At room temperature, a limiting value of approximately 30 percent for the GSP was approached at high pump energies. Observations of the relative R_{1}(3/2), R_{1}(1/2) thresholds at 90°K as a function of mirror reflectivity indicated that the2E excited state absorption cross section at the laser wavelength is less than 5 \times 10^{-21} cm2. Detection of total internal reflection oscillations in cooled ruby lasers from ESR observations is also described.

Published in:

Quantum Electronics, IEEE Journal of  (Volume:3 ,  Issue: 4 )