公开(公告)号：DE3687210T2

公开(公告)日：1993-06-03

申请号：DE3687210

申请日：1986-08-19

Applicant: IBM

Inventor： SCHECHTMAN BARRY HERMAN ,  BJORKLUND GARY CARL ,  BELL ALAN EDWARD

IPC: G11B11/10 ,  G03G5/16 ,  G11B5/66 ,  G11B11/105 ,  G11B5/02 ,  G11B5/62 ,  G11B13/04

公开(公告)号：DE3687210D1

公开(公告)日：1993-01-14

申请号：DE3687210

申请日：1986-08-19

Applicant: IBM

Inventor： SCHECHTMAN BARRY HERMAN ,  BJORKLUND GARY CARL ,  BELL ALAN EDWARD

IPC: G11B11/10 ,  G03G5/16 ,  G11B5/66 ,  G11B11/105 ,  G11B5/02 ,  G11B5/62 ,  G11B13/04

公开(公告)号：DE3475225D1

公开(公告)日：1988-12-22

申请号：DE3475225

申请日：1984-06-20

Applicant: IBM

Inventor： BJORKLUND GARY CARL ,  LEVENSON MARC DAVID

IPC: G01J3/447 ,  G01J3/10 ,  G01J3/42 ,  G01J3/433 ,  G01J9/04 ,  G01N21/19 ,  G01N21/27

Abstract: A method and device for detecting dichroic and/or birefringent narrow spectral features in a sample is described. The method includes the steps of providing a beam of light having an optical frequency bandwidth which is narrow compared to the width of the narrow spectral feature and having a center frequency ωc which lies near the narrow spectral feature, polarization phase modulating a beam of light with a single RF frequency to provide a pure FM spectrum having upper and lower sidebands in which either the carrier and sidebands have been polarized differently with respect to one another, exposing the sample containing the narrow spectral feature to the polarized modulated light so that the FM sidebands probe the narrow spectral feature, polarization analyzing and then photodetecting the light emerging from the sample to detect a RF beat at the specific RF frequency used for the polarization phase modulation, and electronically monitoring the amp- l i tude of the RF beat signal to indicate the strength of the narrow spectral feature. The device includes a polarization phase modulator (17) and a polarization analyzer (18) positioned on opposite sides of the sample (16). In a preferred embodiment the polarization phase modulator produces a frequency modulated optical spectrum with the sidebands polarized precisely orthogonal to the carrier (Fig. 3).

公开(公告)号：DE3166819D1

公开(公告)日：1984-11-29

申请号：DE3166819

申请日：1981-07-06

Applicant: IBM

Inventor： ALVAREZ DAVID CHRISTOPHER ,  BJORKLUND GARY CARL ,  BURLAND DONALD MAXWELL

IPC: G02F1/35 ,  G03C1/73 ,  G03F7/00 ,  G03H1/02 ,  G11B7/0065 ,  G03C1/72 ,  G11B7/00

Abstract: A process and recording medium for four-level, two-photon holography are provided. These media are particularly useful for recording holograms using continuous wave lasers. The recording medium is formed by a transparent resin containing a tetrazine compound. The process comprises the steps of shining a single beam of light of frequency ω 1 upon a four-level holographic recording medium and exposing the recording medium to light at frequency ω 2 , thereby forming a holographic interference pattern in the recording medium and changing the index of refraction and/or the absorption coefficient of said recording medium.