公开(公告)号：JP2001244552A

公开(公告)日：2001-09-07

申请号：JP2001046368

申请日：2001-02-22

Applicant: LUCENT TECHNOLOGIES INC

Inventor： KRAUSZ FERENC ,  KNOX WAYNE HARVEY ,  TEMPEA GABRIEL FLORIN

IPC: H01S5/065 ,  H01S3/06 ,  H01S3/08 ,  H01S3/098 ,  H01S5/04

Abstract: PROBLEM TO BE SOLVED: To realize a wide-band saturable Bragg reflector suitable for using on the occasion of mode-locking a laser, to provide a pulse not longer than 10 femtoseconds, or pulse tunable over a wide wavelength band and comparatively long. SOLUTION: A saturable Bragg reflector 10 has monolithic integrated multilayer stack having three sections favorably. The first section 12 functions as an appropriate board for indicating the other sections. The second section 14 has a plurality of semiconductor layers composed by arranging materials having relatively high refractive indexes such as AlxGa1-xAs, and materials having relatively low refractive indexes such as AlAs alternately. These layers are grown epitaxially on a board, and their thicknesses and values of X change along the board. Generally, these layers increase in thickness and their x values decrease with their distance from the uppermost part of the stack.

公开(公告)号：JP2002270929A

公开(公告)日：2002-09-20

申请号：JP2001053928

申请日：2001-02-28

Applicant: LUCENT TECHNOLOGIES INC

Inventor： KRAUSZ FERENC ,  CUNNINGHAM JOHN E ,  KNOX WAYNE HARVEY ,  TEMPEA GABRIEL FLORIN

IPC: H01S3/098

Abstract: PROBLEM TO BE SOLVED: To provide an improved technique for obtaining the delay characteristics of semiconductor layers in a multilayered stack by achieving desirable changes in optical thickness and composition. SOLUTION: A saturable absorber mirror which is used at the time of locking the mode of a laser uses the multilayered stack of compound semiconductor layers which is arranged under a multilayered stack of dielectric layers forming a smooth edge filter and alternately contains narrow and broad energy band gaps. The narrow energy band gap layers are alloy-modulated in a digital mode and the energy band gaps of the layers are changed so that the mirror offers a desired group-delay dispersing characteristic.