GB1087822A - Creation of Inventions and Patents with Artificial Intelligence

GB1087822A – Improvements in or relating to lasers
– Google Patents

GB1087822A – Improvements in or relating to lasers
– Google Patents
Improvements in or relating to lasers

Info

Publication number
GB1087822A

GB1087822A
GB18244/65A
GB1824465A
GB1087822A
GB 1087822 A
GB1087822 A
GB 1087822A
GB 18244/65 A
GB18244/65 A
GB 18244/65A
GB 1824465 A
GB1824465 A
GB 1824465A
GB 1087822 A
GB1087822 A
GB 1087822A
Authority
GB
United Kingdom
Prior art keywords
active medium
region
potential
phase shift
light
Prior art date
1964-05-01
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
GB18244/65A
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.)

International Business Machines Corp

Original Assignee
International Business Machines Corp
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.)
1964-05-01
Filing date
1965-04-30
Publication date
1967-10-18

1965-04-30
Application filed by International Business Machines Corp
filed
Critical
International Business Machines Corp

1967-10-18
Publication of GB1087822A
publication
Critical
patent/GB1087822A/en

Status
Expired
legal-status
Critical
Current

Links

Espacenet

Global Dossier

Discuss

Classifications

H—ELECTRICITY

H01—ELECTRIC ELEMENTS

H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL

H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range

H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating

H01S3/101—Lasers provided with means to change the location from which, or the direction in which, laser radiation is emitted

Abstract

1,087,822. Lasers. INTERNATIONAL BUSINESS MACHINES CORPORATION. April 30, 1965 [May 1, 1964], No. 18244/65. Heading H1C. [Also in Division G2] A laser emitting polarized light from an active medium 1, Fig. 1, has the stimulated emission restricted to a selected region of the active medium, the region of emission being determined by the potential applied to an electrooptic crystal 20 which operates in association with a Babinet compensator 8 in the laser optical cavity. The active medium may be either a gas the emitted light from which passes through windows 2 at the Brewster angle or a ruby. The optical cavity is defined by mirrors 4, 5 one of which passes an output beam 6. The electrooptic crystal 20 may be a potassium dihydrogen phosphate crystal having transparent electrodes 21 to which an adjustable and reversible control potential is applied from a source 24. In the absence of control potential the stimulated emission is restricted to a narrow region extending across the active medium and coplanar with its axis, the Babinet compensator causing circular or elliptical polarization of light emitted from all other regions. Only reflected plane polarized light is of sufficient intensity to effect lasing in the region where it passes through the active medium. The function of the electro-optic crystal is to effect a phase shift in the light passing through it which is opposite in effect to the phase shift produced at a corresponding point in the Babinet compensator, the amount of phase shift being determined by the magnitude and polarity of the control potential. When such a potential is applied, complete phase cancelling of the phase shift produced in light passing through the compensator is obtained in a planar region offset from the laser axis. By appropriate control the narrow lasing region in the active medium can thus be selected as required. In an alternative arrangement, Fig. 4 (not shown), and Fig. 6, a further Babinet compensator 31 and electrooptic crystal 32, together with a polarizer 30 are positioned in the optical cavity with a 90-degree optical relationship to the original components 8, 9. Consequently by suitable potential values from sources 24, 38, only a filament of the whole active medium 1 is able to lase. A modification, Fig. 6, uses a spherical mirror 40 in place of mirror 4, the mirror 40 and a lens 41 having a common focal point P within the active medium. Consequently the selected lasing region is in the form of a narrow double cone within the active medium. This arrangement includes a mask 44 with character-shaped portions through which the output beam may pass, the beam being then directed by a lens 45 on to the surface of a movable light-sensitive material 46. By suitably adjusting the potentials applied to the electro-optic crystals 9, 32, a selected cone-shaped portion of the active medium lases and a corresponding character in the mask is recorded on the film.

GB18244/65A
1964-05-01
1965-04-30
Improvements in or relating to lasers

Expired

GB1087822A
(en)

Applications Claiming Priority (1)

Application Number
Priority Date
Filing Date
Title

US36420764A

1964-05-01
1964-05-01

Publications (1)

Publication Number
Publication Date

GB1087822A
true

GB1087822A
(en)

1967-10-18

Family
ID=23433512
Family Applications (1)

Application Number
Title
Priority Date
Filing Date

GB18244/65A
Expired

GB1087822A
(en)

1964-05-01
1965-04-30
Improvements in or relating to lasers

Country Status (4)

Country
Link

US
(1)

US3482182A
(en)

DE
(1)

DE1297249B
(en)

FR
(1)

FR1455868A
(en)

GB
(1)

GB1087822A
(en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

US3703137A
(en)

1971-03-19
1972-11-21
Bell Telephone Labor Inc
High-speed printing apparatus

DE3486342T2
(en)

1983-09-26
1995-05-11
Tektronix Inc

Switchable color filter and its use in a display device with a sequential raster sequence and full color reproduction.

US4758818A
(en)

1983-09-26
1988-07-19
Tektronix, Inc.
Switchable color filter and field sequential full color display system incorporating same

US4635051A
(en)

1983-09-26
1987-01-06
Tektronix, Inc.
High-speed electro-optical light gate and field sequential full color display system incorporating same

US7489399B1
(en)

2004-08-20
2009-02-10
Kla-Tencor Corporation
Spectroscopic multi angle ellipsometry

Family Cites Families (9)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

US2976764A
(en)

1958-12-04
1961-03-28
American Optical Corp
Polarimeters

NL250206A
(en)

1959-04-06

FR1306777A
(en)

1961-10-02
1962-10-19
Trg

Light amplifier device

BE633533A
(en)

1962-06-21

NL294706A
(en)

1962-06-29

US3180216A
(en)

1962-08-13
1965-04-27
American Optical Corp
System and apparatus for variable phase microscopy

US3229223A
(en)

1962-09-10
1966-01-11
Rca Corp
Laser modulation system having internal polarization vector selection

NL302766A
(en)

1963-02-01

US3293565A
(en)

1963-12-31
1966-12-20
Ibm
Laser imaging employing a degenerate optical cavity

1964

1964-05-01
US
US364207A
patent/US3482182A/en
not_active
Expired – Lifetime

1965

1965-03-23
DE
DEJ27760A
patent/DE1297249B/en
not_active
Withdrawn

1965-04-29
FR
FR15118A
patent/FR1455868A/en
not_active
Expired

1965-04-30
GB
GB18244/65A
patent/GB1087822A/en
not_active
Expired

Also Published As

Publication number
Publication date

FR1455868A
(en)

1966-10-21

US3482182A
(en)

1969-12-02

DE1297249B
(en)

1969-06-12

Contact information