Abstract
Lasing at room temperature is obtained in a Fe : ZnSe crystal installed as a passive Q-switch in a diode-pumped Er : YLF laser resonator. A miniresonator of the Fe : ZnSe laser is formed by mirrors pressed against the optical surfaces of the crystal with high reflectivities at λ = 4 − 4.5 μm and a high transmittance for the Er : YLF laser generation lines. In the Er : YLF laser resonator, short pulses of ∼100 ns duration at λ = 2.65 μm are generated, stipulated by passive Q-switching of the resonator by the Fe : ZnSe crystal. The absorption of the Er : YLF laser radiation in the Fe : ZnSe crystal leads to the pumping of Fe : ZnSe laser, which generates pulses with a duration of less than 50 ns and an energy of ∼0.5 μJ at λ = 4.2 μm. The laser operates in the pulse-periodic pump regime with a repetition rate up to 200 Hz.
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