公开(公告)号：DE2728359A1

公开(公告)日：1978-03-30

申请号：DE2728359

申请日：1977-06-23

Applicant: IBM

Inventor： BENNETT ROBERT JAMES ,  GRISCHKOWSKY DANIEL RICHARD

IPC: G02F1/17 ,  G02F1/01 ,  G02F1/35 ,  G02F2/02

Abstract: A dark pulse is manifested when the intensity of a laser beam, for example, a continuous wave laser beam drops to zero and returns to its original intensity in a very short time period. A modulator for producing dark pulse outputs is disclosed which includes a two-photon absorption cell provided with two input laser beams: a continuous wave beam having a frequency omega 1 and a mode-locked laser beam having a frequency omega 2 selected such that omega 1 + omega 2 = OMEGA 12 where OMEGA 12 is also the two-photon absorption frequency of the vapor contained in the cell. The mode locked beam modulates the continuous wave beam to produce the desired dark pulses.

公开(公告)号：DE2719467A1

公开(公告)日：1977-12-08

申请号：DE2719467

申请日：1977-04-30

Applicant: IBM

Inventor： GRISCHKOWSKY DANIEL RICHARD ,  HODGSON RODNEY TREVOR ,  SOROKIN PETER PITIRIMOVICH

IPC: H01S3/30 ,  G02F1/35 ,  H01S3/09 ,  H01S3/22

公开(公告)号：DE2433494A1

公开(公告)日：1975-02-20

申请号：DE2433494

申请日：1974-07-12

Applicant: IBM

Inventor： COURTENS ERIC LEAN ,  GRISCHKOWSKY DANIEL RICHARD

IPC: H01S3/091 ,  H01S3/0915 ,  H01S3/094 ,  H01S3/22 ,  H01S3/14