公开(公告)号：JP2000352614A

公开(公告)日：2000-12-19

申请号：JP16309099

申请日：1999-06-09

Applicant: AGENCY IND SCIENCE TECHN ,  OGURA MUTSURO

Inventor： OGURA MUTSURO ,  STEVE DODDS ,  CHO SHIKO

IPC: G02B5/26 ,  G02B5/28 ,  G02B6/02 ,  G02B6/10 ,  H04B10/2507 ,  H04B10/2519

Abstract: PROBLEM TO BE SOLVED: To provide a dispersion compensation mirror in which a dispersion correction amt. as large as possible and an accurate wavelength dispersion compensation profile can be obtd. SOLUTION: In the optimization method, a mirror having desired reflectance in the wavelength range necessary for incident light is assumed as a subsystem, and the pole position and intensity of the impedance of this subsystem are calculated. An optimized system is determined by moving the calculated pole position and intensity so as to obtain the desired wavelength dispersion in the above necessary wavelength range. Then the refractive index distribution which realizes the impedance function of the optimized system is obtd. by the inverse spectrum method, and the obtd. distribution is used as the optimized refractive index distribution.

公开(公告)号：JP2000058976A

公开(公告)日：2000-02-25

申请号：JP22708898

申请日：1998-08-11

Applicant: AGENCY IND SCIENCE TECHN

Inventor： CHO SHIKO ,  NAKAGAWA ITARU ,  ITAYA TARO ,  SUGAYA TAKEYOSHI ,  TORITSUKA KENJI

IPC: H01S3/08 ,  G02B5/08 ,  H01S5/00 ,  H01S5/30

Abstract: PROBLEM TO BE SOLVED: To manufacture a wide band semiconductor saturable absorption reflector having high reflectance by additionally providing a thin film of a dielectric substance transparent to light in a specified wavelength range and exhibiting refractive index lower than that of a semiconductor multiplayer film structure for the light in the specified wavelength range between a metal face and a semiconductor multilayer film structure. SOLUTION: A transparent substance 7 having different refractive index is arranged between the metallic reflective film 3 of a wide band semiconductor saturable absorption reflector and semiconductor layers 4, 5, 6 in order to enhance reflectance. The transparent substance 7 must be transparent over the entire wavelength range of optical spectrum in a pulse laser utilizing a wide band semiconductor saturable absorption reflector. In order to attaing a significant effect, refractive index of the transparent substance must be sufficiently lower than that of the semiconductor layers 4, 5, 6 and sufficiently higher than that of the metal. A substance having such a refractive index can be selected generally among so-called dielectrics.