Patent ID: 6541288
Filing Date: 2003-04-01
Classification: H01S

Abstract:
A method of determining reflectivity of a semiconductor laser facet, comprising the steps of:(a) fabricating, with equal facet reflectance R0, a first semiconductor laser with a first cavity length L1 and a second semiconductor laser with a second cavity length L2, where the first semiconductor laser has a first facet and a second facet; (b) determining the facet reflectance R0; (c) measuring a threshold current density J1 of the first semiconductor laser; (d) measuring a threshold current density J2 of the second semiconductor laser; (e) if the reflectance of the first facet of the first semiconductor laser is modified and the second facet of the first semiconductor laser is not modified then setting u=1, x=1, and y=1; (f) if the reflectance of the first facet and the second facet of the first semiconductor laser are modified to the same extent then setting u=1, x=1, and y=0.5; (g) if the reflectance of the first facet of the first semiconductor laser is not modified and the second facet of the first semiconductor laser is modified then setting u=1, x=1, and yâˆ’1; (h) measuring a threshold current density J3 of the modified first semiconductor laser; and (i) determining the reflectance of each modified facet of the first semiconductor laser as follows: R1=(u){(R0)Exp[xâˆ’(2y[(1/L1)âˆ’(1/L2)]L1(J1âˆ’J3)/(J1âˆ’J2))]}, where Exp[xâˆ’(2y[(1/L1)âˆ’(1/L2)]L1(J1âˆ’J3)/(J1âˆ’J2))] is an exponentiation function that makes the expression within the brackets the exponent of the preceding entity.