Abstract
Intracavity frequency mixing processes in semiconductor lasers open a wide field of new frequency sources with an enormous area of applications. However, second harmonic generation as the simplest fundamental nonlinear optical process exhibits a vanishing efficiency due to the strong band-to-band absorption of the frequency doubled light.1 The most effective nonlinear process reported until now is four-wave mixing (FWM), a third-order nonlinear susceptibility χ(3) related process.2,3 We have studied this process by injecting light from a second source (dye or semiconductor laser) into the active region of a semiconductor laser.
© 1990 Optical Society of America
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