CA2066202A1 - Lasers a modulation de puissance - Google Patents

Lasers a modulation de puissance

Info

Publication number
CA2066202A1
CA2066202A1 CA2066202A CA2066202A CA2066202A1 CA 2066202 A1 CA2066202 A1 CA 2066202A1 CA 2066202 A CA2066202 A CA 2066202A CA 2066202 A CA2066202 A CA 2066202A CA 2066202 A1 CA2066202 A1 CA 2066202A1
Authority
CA
Canada
Prior art keywords
displacements
variations
target
laser
power
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA2066202A
Other languages
English (en)
Other versions
CA2066202C (fr
Inventor
Alan J. Bearden
Michael P. O'neill
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
University of California
Original Assignee
Alan J. Bearden
Michael P. O'neill
The Regents Of The University Of California
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Alan J. Bearden, Michael P. O'neill, The Regents Of The University Of California filed Critical Alan J. Bearden
Publication of CA2066202A1 publication Critical patent/CA2066202A1/fr
Application granted granted Critical
Publication of CA2066202C publication Critical patent/CA2066202C/fr
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B21/00—Microscopes
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor

Landscapes

  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Microscoopes, Condenser (AREA)
  • Optical Head (AREA)
  • Semiconductor Lasers (AREA)
  • Glass Compositions (AREA)

Abstract

icroscope optique (20), dont le pouvoir de résolution varie du picomètre au nanomètre, pour l'observation unidimensionnelle des caractéristiques de la surface d'un élément cible. Le microscope est muni d'un laser (22) produisant un faisceau de sortie cohérent (24), d'une lentille (36) pour assurer la mise au point du faisceau de sortie sur une cible (38) et d'un photodétecteur (44) pour mesurer la puissance de sortie du faisceau. Le faisceau focalisé se déplace par rapport à la surface de la cible dans des mouvements spécifiques tributaires du temps et de la position. Une partie de la lumière réfléchie par la surface de la cible est retournée dans le laser. Les variations mesurées de la puissance du laser sont ensuite converties en déplacements tributaires de la position, dans la direction du faisceau de sortie. Description d'un appareil de stockage optique des données et d'un disque pour stocker et lire l'information à différents niveaux submicroniques
CA002066202A 1989-09-29 1990-09-27 Lasers a modulation de puissance Expired - Fee Related CA2066202C (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/414,897 US5029023A (en) 1989-09-29 1989-09-29 Laser-amplified motion detector and method
US07/414,897 1989-09-29

Publications (2)

Publication Number Publication Date
CA2066202A1 true CA2066202A1 (fr) 1991-03-30
CA2066202C CA2066202C (fr) 1997-08-26

Family

ID=23643469

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002066202A Expired - Fee Related CA2066202C (fr) 1989-09-29 1990-09-27 Lasers a modulation de puissance

Country Status (8)

Country Link
US (1) US5029023A (fr)
EP (1) EP0494255B1 (fr)
JP (1) JP2823092B2 (fr)
AT (1) ATE166993T1 (fr)
AU (1) AU639496B2 (fr)
CA (1) CA2066202C (fr)
DE (1) DE69032373T2 (fr)
WO (1) WO1991005336A1 (fr)

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US6088306A (en) * 1998-02-13 2000-07-11 International Business Machines Corporation System for creating, reading and writing on rotatable information storage media, an apparatus for combined writing and reading operations
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US6097681A (en) * 1998-02-13 2000-08-01 International Business Machines Corporation System for creating, reading and writing on rotatable information storage media, an apparatus for determining angular position, θ
US6108282A (en) * 1998-02-13 2000-08-22 International Business Machines Corporation System for creating, reading and writing on rotatable information storage media, an apparatus for multilayer laser source positioning
US5892739A (en) * 1998-02-13 1999-04-06 International Business Machines Corporation In system for creating reading and writing on rotatable information storage media, an apparatus for multilayer source positioning using the laser source as a detector
US6574015B1 (en) 1998-05-19 2003-06-03 Seagate Technology Llc Optical depolarizer
US6590661B1 (en) 1999-01-20 2003-07-08 J. Mitchell Shnier Optical methods for selectively sensing remote vocal sound waves
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Also Published As

Publication number Publication date
WO1991005336A1 (fr) 1991-04-18
ATE166993T1 (de) 1998-06-15
EP0494255A1 (fr) 1992-07-15
AU6535890A (en) 1991-04-28
EP0494255B1 (fr) 1998-06-03
CA2066202C (fr) 1997-08-26
JPH05501004A (ja) 1993-02-25
JP2823092B2 (ja) 1998-11-11
US5029023A (en) 1991-07-02
DE69032373D1 (de) 1998-07-09
EP0494255A4 (en) 1993-05-19
AU639496B2 (en) 1993-07-29
DE69032373T2 (de) 1998-10-01

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