GB957235A - Optical radar system - Google Patents

Optical radar system

Info

Publication number
GB957235A
GB957235A GB998862A GB998862A GB957235A GB 957235 A GB957235 A GB 957235A GB 998862 A GB998862 A GB 998862A GB 998862 A GB998862 A GB 998862A GB 957235 A GB957235 A GB 957235A
Authority
GB
United Kingdom
Prior art keywords
rod
light
ruby
laser
flash tube
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
GB998862A
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.)
Raytheon Co
Original Assignee
Hughes Aircraft 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 Hughes Aircraft Co filed Critical Hughes Aircraft Co
Publication of GB957235A publication Critical patent/GB957235A/en
Expired legal-status Critical Current

Links

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
    • H01S3/09—Processes or apparatus for excitation, e.g. pumping
    • H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
    • G01S7/481—Constructional features, e.g. arrangements of optical elements
    • G01S7/4814—Constructional features, e.g. arrangements of optical elements of transmitters alone
    • 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
    • H01S3/02—Constructional details
    • H01S3/04—Arrangements for thermal management
    • H01S3/042—Arrangements for thermal management for solid state lasers
    • 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
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/08—Construction or shape of optical resonators or components thereof
    • H01S3/081—Construction or shape of optical resonators or components thereof comprising three or more reflectors
    • H01S3/083—Ring lasers
    • 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
    • H01S3/09—Processes or apparatus for excitation, e.g. pumping
    • H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
    • H01S3/0915—Processes or apparatus for excitation, e.g. pumping using optical pumping by incoherent light
    • H01S3/092—Processes or apparatus for excitation, e.g. pumping using optical pumping by incoherent light of flash lamp
    • H01S3/093—Processes or apparatus for excitation, e.g. pumping using optical pumping by incoherent light of flash lamp focusing or directing the excitation energy into the active medium
    • 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
    • H01S3/09—Processes or apparatus for excitation, e.g. pumping
    • H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
    • H01S3/0915—Processes or apparatus for excitation, e.g. pumping using optical pumping by incoherent light
    • H01S3/092—Processes or apparatus for excitation, e.g. pumping using optical pumping by incoherent light of flash lamp
    • H01S3/093—Processes or apparatus for excitation, e.g. pumping using optical pumping by incoherent light of flash lamp focusing or directing the excitation energy into the active medium
    • H01S3/0931—Imaging pump cavity, e.g. elliptical

Abstract

957,235. Lasers. HUGHES AIRCRAFT CO. March 15, 1962 [April 13, 1961], No. 9988/62. Headings H3B and H4D. An optical radar system includes a laser. Solid state lasers.-A laser comprises a cylindrical rod of pink ruby (Al 2 O 3 doped with Cr 2 O 3 ) and a source of pumping light so arranged that substantially all the light impinges on the ruby rod. In Fig. 3, a ruby rod 30 containing less than 0.1% by weight of chromium is disposed coaxially within a helical flash-tube 28. A cylindrical reflector 38 directs the light on to the ruby. The ends 26, 30 of the ruby rod are silvered to provide at least 10% reflection and to define a regenerative path. One end 32 has a portion not silvered to allow a free passage for the output beam 34 which is monochromatic and coherent. In Fig. 4 a flashing gas 52 is disposed between a ruby rod 40 and a reflecting cylinder 50. Electrodes 54, 56 are energized to cause emission of pumping light by the gas. The stimulated output beam emerges through an opening 46 in the reflective coating 44. In Fig. 5, a rod 60 is disposed within a hollow flash tube 62. Fluorescein 64 fills the space between the rod and the flash tube and converts the light from the flash tube into predominantly green light suitable for pumping the ruby. In Fig. 7, a cylindrical flash tube 72 is disposed within a hollow cylinder 70 of laser material. The cylinder 70 is surrounded by a cylinder 74 filled with cooling material 76. A laser element may be coated with material which is transparent to the pumping energy but absorbent at the laser output frequency. Alternatively, the element may be enclosed and cooled with a material such as di-iodomethane which has a high refractive index 1.75 (ruby 1.76) so that in effect there is no internal reflection. In Fig. 12, the regenerative path for the laser output is defined by four prisms 138, 140, 142, 144 and a Fabry-Perot interferometer 148 all outside the element. The regenerative path of an element 160, Fig. 13, may be defined by reflective plates 162, 164 displaced from the non-reflective ends of the element. Parabolic or elliptical mirrors may be used to concentrate the light from a pumping source 184 on to a laser element 182, Figs. 15, 16. Refrigerated operation, Fig. 8.-A rod 78 of laser material is mounted on a rod 88 of copper or sapphire. The major portion of the rod 88 is immersed in liquid nitrogen 90 in a Dewer flash 92. A hollow cylindrical flash tube 94 surrounding the flash tube is cooled by liquid in a jacket 100. Optical radar system, Fig. 17.-A power supply 206 pulses a gas filled flash tube 204 when triggered by a synchronizer 208 which simultaneously starts a scanning operation in oscillographs 214, 216. A laser rod 202 associated with the flash tube transmits a beam of monochromatic coherent light towards a target 212. The reflected light is filtered at 230 and is focused on a photo-electric cell 226 by a parabolic reflector 224. The reflected pulse of light is indicated on an oscillograph 216. The transmitted pulse is detected by a photo-cell 218 and is indicated by a second oscillograph 214.
GB998862A 1961-04-13 1962-03-15 Optical radar system Expired GB957235A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US10269861A 1961-04-13 1961-04-13

Publications (1)

Publication Number Publication Date
GB957235A true GB957235A (en) 1964-05-06

Family

ID=22291217

Family Applications (1)

Application Number Title Priority Date Filing Date
GB998862A Expired GB957235A (en) 1961-04-13 1962-03-15 Optical radar system

Country Status (1)

Country Link
GB (1) GB957235A (en)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3223944A (en) * 1964-06-25 1965-12-14 Raytheon Co Laser employing elliptical reflector cavity
US3410641A (en) * 1965-06-25 1968-11-12 Navy Usa Laser range finder device
US3474704A (en) * 1966-11-16 1969-10-28 Saab Ab Toss bombing instrument having improved means for acquisition of distance data at pickle
US3509566A (en) * 1967-11-01 1970-04-28 Cornell Aeronautical Labor Inc Method and apparatus for obtaining azimuth and range from a scanning continuous wave radar
US3620626A (en) * 1969-05-29 1971-11-16 Quantronix Corp Proximity warning system for aircraft
US3630616A (en) * 1968-03-06 1971-12-28 British Aircraft Corp Ltd Range finders
US3647298A (en) * 1969-09-16 1972-03-07 Us Navy Pulse chirp laser ranging device
US3743419A (en) * 1969-07-09 1973-07-03 Bofors Ab Ranging system
US3757632A (en) * 1970-09-28 1973-09-11 Gen Robotics Inc Ammunition tracer system
US4143835A (en) * 1972-09-12 1979-03-13 The United States Of America As Represented By The Secretary Of The Army Missile system using laser illuminator
GB2272103A (en) * 1989-02-21 1994-05-04 Sun Microsystems Inc Active fiber for optical signal transmission

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3223944A (en) * 1964-06-25 1965-12-14 Raytheon Co Laser employing elliptical reflector cavity
US3410641A (en) * 1965-06-25 1968-11-12 Navy Usa Laser range finder device
US3474704A (en) * 1966-11-16 1969-10-28 Saab Ab Toss bombing instrument having improved means for acquisition of distance data at pickle
US3509566A (en) * 1967-11-01 1970-04-28 Cornell Aeronautical Labor Inc Method and apparatus for obtaining azimuth and range from a scanning continuous wave radar
US3630616A (en) * 1968-03-06 1971-12-28 British Aircraft Corp Ltd Range finders
US3620626A (en) * 1969-05-29 1971-11-16 Quantronix Corp Proximity warning system for aircraft
US3743419A (en) * 1969-07-09 1973-07-03 Bofors Ab Ranging system
US3647298A (en) * 1969-09-16 1972-03-07 Us Navy Pulse chirp laser ranging device
US3757632A (en) * 1970-09-28 1973-09-11 Gen Robotics Inc Ammunition tracer system
US4143835A (en) * 1972-09-12 1979-03-13 The United States Of America As Represented By The Secretary Of The Army Missile system using laser illuminator
GB2272103A (en) * 1989-02-21 1994-05-04 Sun Microsystems Inc Active fiber for optical signal transmission
GB2272103B (en) * 1989-02-21 1994-12-07 Sun Microsystems Inc Active fiber for optical signal transmission

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