Cl. Felix et al., Low-threshold optically pumped lambda=4.4 mu m vertical-cavity surface-emitting laser with a PbSe quantum-well active region, APPL PHYS L, 78(24), 2001, pp. 3770-3772
We report pulsed emission from an optically pumped lead-salt vertical-cavit
y surface-emitting laser with a PbSe/PbSrSe quantum-well active region. The
lasing wavelength of lambda = 4.44 mum is nearly constant over the tempera
ture range 200-280 K, and the threshold is only 10.5 kW/cm(2) at 260 K, whe
re the gain peak and cavity mode are in resonance. Over 330 mW of peak powe
r is emitted at 260 K, into a circular beam whose divergence angle increase
s with pump intensity. (C) 2001 American Institute of Physics.