Er2O3: Ho3+is an unusual laser material in that the host crystal itself provides the dominant pumping mechanism by means of energy transfer. The additional pumping bands due to Er3+and the consequent efficient transfer of energy to the Ho3+laser ion lead to relatively low threshold laser operation: 5 joules pulsed and 200W CW for a 12mm long crystal at 77°K. The emission waveleng this 2.121μ, a region of good atmospheric transmission. Additional laser experiments were carried out at 145°K. Excitation and fluorescence spectra are discussed.
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Hoskins et al. (1966) studied this question.
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