Patent ID: 6141359
Filing Date: 2000-10-31
Classification: B82Y,G02F,H01S

Abstract:
A laser for generating an optical beam at a spectrum of desired lasing, said laser comprising first and second end reflectors and a gain medium, said second end reflector including a first inner quarter-wave stack of dielectric material layers, a second outer quarter-wave stack of dielectric materials and a quantum well layer within one of said layers in the said outer stack so that said second end reflector provides a nonlinear saturation response to incident radiation in order to modelock said laser, said first quarter wave stack having a reflection spectrum broader than the spectrum of desired lasing but providing insufficient reflectivity to produce lasing and said second quarter-wave stack having a reflection spectrum narrower than the first stack and a reflectivity which in combination with said first quarter-wave stack provides, sufficient reflectivity to produce lasing selectively in the spectrum of desired lasing.