Optically pumped lasers emitting near 600 nm at room temperature have been fabricated for the first time in Cd0.25Zn0.75Te/ZnTe superlattices grown on GaAs substrates. The threshold pump intensity using pulsed 0.53 μm radiation increased from ∼7 kW/cm at 10 K to ∼60 kW/cm2 at room temperature with a threshold temperature dependence described by T0∼111 K.
Subnanosecond optical pulses (as short as 7 psec) have been generated over the 0.58-0.80-microm wavelength range with good beam quality, energies in excess of 1 microJ/pulse (up to 20 microJ/pulse), and repetition rates of at least 10 Hz using a flashlamp-pumped dye laser. The experimental details concerned with mode locking the dye laser and the selection of single pulses from the pulse train with an energy reproducibility of 10% are described.
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