As opposed to the commonly observed route to chaos in semiconductor lasers, which involves undamping of the laser relaxation oscillations. Lasers argon and krypton ion lasers similar to the henelaser the argon ion gas laser is pumped by electric dis charge and emitts light at wavelength. Longwavelength infrared semiconductor lasers wiley series in. The longwavelength infrared spectrum spanning from 2 m m to m m is technologically signi. The wavelength spacing of the longitudinal modes varies slowly, and if the laser operates at approximately 1550 nm, the longitudinal modes are separated by about 1. Various designs will be overviewed with particular emphasis on the widely tunable 32nm types. A laser diode, ld, injection laser diode ild, or diode laser is a semiconductor device similar. This paper evaluates the system engineering merit in using semiconductor lasers, which offer ordersofmagnitudehigher power, brightness, and lower noise. Longwavelength infrared semiconductor lasers nasaads. Semiconductor lasers and light emitting diodes 1222 for a 250 m long semiconductor laser and an effective index of 3. Meanwhile, tapered semiconductor lasers at nearinfrared wavelengths have recently become able to. Tunable semiconductor lasers continue to be in just about everyones list of important components for future fiber optic networks.
Longwavelength infrared semiconductor lasers wiley. Infrared and red laser diodes are common in cd players, cd roms and dvd. Longwavelength semiconductor lasers govind agrawal. Osa multiwavelength midinfrared microspectral imaging. In semiconductor optical amplifiers soas, photons multiplied via stimulated emission. It is used in applications ranging from retinal photother apy for diabetes, lithography, and pumping of other lasers. In soas photons were confined in the dimensions transverse to the waveguide but were allowed to escape from the end of the waveguide. Advances in material purity and epitaxial growth techniques have led to a variety of semiconductor lasers covering a wide wavelength range of 0. Many current instruments employ thermal ir light sources, which suffer the problem of low brightness and high noise. It includes three topics not covered in any previous book. The development during the 1970s of gaas semiconductor lasers. Since its invention in 1962, the semiconductor laser has come a long way. Longwavelength infrared semiconductor lasers wiley series in lasers and applications choi, hong k.
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