GB1401085A - Acousto-optic filters - Google Patents

Acousto-optic filters

Info

Publication number
GB1401085A
GB1401085A GB314775A GB314775A GB1401085A GB 1401085 A GB1401085 A GB 1401085A GB 314775 A GB314775 A GB 314775A GB 314775 A GB314775 A GB 314775A GB 1401085 A GB1401085 A GB 1401085A
Authority
GB
United Kingdom
Prior art keywords
acoustic
optical
crystal
velocity vector
polarization
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.)
Expired
Application number
GB314775A
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.)
HP Inc
Original Assignee
Hewlett Packard Co
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 Hewlett Packard Co filed Critical Hewlett Packard Co
Publication of GB1401085A publication Critical patent/GB1401085A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/002—Devices for damping, suppressing, obstructing or conducting sound in acoustic devices
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/11—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on acousto-optical elements, e.g. using variable diffraction by sound or like mechanical waves
    • G02F1/116—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on acousto-optical elements, e.g. using variable diffraction by sound or like mechanical waves using an optically anisotropic medium, wherein the incident and the diffracted light waves have different polarizations, e.g. acousto-optic tunable filter [AOTF]

Abstract

1401085 Modulating light HEWLETTPACKARD CO 21 July 1972 [10 April 1972] 3147/75 Divided out of 1401083 Heading H4F In a tunable optical filter of the type wherein a portion of a plane polarized optical beam traversing an acoustically anisotropic photoelastic birefringent crystal is diffracted into an orthogonal plane of polarization by an acoustic wave having its group velocity vector collinear with the optical path, and is subsequently filtered out by a polarization analyser, the optical output face of the crystal is substantially normal to the acoustic group velocity vector and at an angle to the phase velocity vector so that on reflection the acoustic energy is reflected out of the optical path and so that the output optical aperture can be of maximum size. As particularly described the crystal may be of quartz, in which the group and phase velocities of a shear wave may diverge by up to 27 degrees, so that undesired acoustic resonances produced on reflection are greatly reduced. In addition the crystal may be coated with an acoustically and optically absorbent material as described more particularly in Specification 1,401,083. The polarization vectors of the input optical and acoustic shear waves are mutually at right angles.
GB314775A 1972-04-10 1972-07-21 Acousto-optic filters Expired GB1401085A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US24251372A 1972-04-10 1972-04-10

Publications (1)

Publication Number Publication Date
GB1401085A true GB1401085A (en) 1975-07-16

Family

ID=22915065

Family Applications (2)

Application Number Title Priority Date Filing Date
GB314775A Expired GB1401085A (en) 1972-04-10 1972-07-21 Acousto-optic filters
GB313475A Expired GB1401084A (en) 1972-04-10 1972-07-21 Acousto-optic filters

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB313475A Expired GB1401084A (en) 1972-04-10 1972-07-21 Acousto-optic filters

Country Status (2)

Country Link
JP (1) JPS496940A (en)
GB (2) GB1401085A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4759613A (en) * 1985-08-19 1988-07-26 U.S. Philips Corp. Acousto-optic modulator

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4949066U (en) * 1972-08-08 1974-04-30
US7894125B2 (en) 2006-05-30 2011-02-22 Bae Systems Acousto-optic devices

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4759613A (en) * 1985-08-19 1988-07-26 U.S. Philips Corp. Acousto-optic modulator

Also Published As

Publication number Publication date
GB1401084A (en) 1975-07-16
JPS496940A (en) 1974-01-22

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees