Patent ID: 6487227
Filing Date: 2002-11-26
Classification: H01S

Abstract:
A semiconductor laser comprising:a first transparent dielectric film formed on at least either a front or rear facet through which oscillating light passes; a second transparent dielectric film formed on said first transparent dielectric film; and a third transparent dielectric film formed on said second transparent dielectric film; wherein the following relationships are satisfied: 0.09&lgr;&lE;n1d1&lE;0.15&lgr;0.20&lgr;&lE;n2d2&lE;0.22&lgr;0.225&lgr;&lE;n3d3&lE;0.245&lgr;1.58&lE;n1&lE;1.64 2.0&lE;n2&lE;2.4 1.44&lE;n3&lE;1.46 where &lgr; is the oscillating wavelength, n1, n2, and n3 are the refractive indices of said first, second, and third dielectric films with respect to said oscillating wavelength, and d1, d2, and d3 are the thicknesses of said first, second, and third dielectric films.