Abstract
A rapidly expanding application of infrared diode lasers is trace-gas sensing using laser-absorption spectroscopy (LAS).1 Applications include pollution monitors in automobiles, semiconductor process control, glucose monitoring and the ex situ diagnosis of internal disorders by monitoring trace gases on human breath.2 For practical implementation of LAS lasers must operate near room temperature in a continuously tunable single longitudinal mode, with an important mid-infrared wavelength range of 2 - 5 μm. The antimonide materials can access 2-5 μm, and significant progress has been made recently. For example, molecular beam epitaxy (MBE)-grown multi-quantum well (MQW) room-temperature cw lasers emitting 2 - 2.4 μm were reported with threshold current densities of 143 A/cm2 and output powers of 1.3W.3 The longest emission wavelength reported thus far for GaSb-based lasers operating at room temperature is 2.78 μm.4
© 1995 Optical Society of America
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