GB1570701A - System for combining laser beams of diverse frequencies - Google Patents

System for combining laser beams of diverse frequencies Download PDF

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Publication number
GB1570701A
GB1570701A GB38534/76A GB3853476A GB1570701A GB 1570701 A GB1570701 A GB 1570701A GB 38534/76 A GB38534/76 A GB 38534/76A GB 3853476 A GB3853476 A GB 3853476A GB 1570701 A GB1570701 A GB 1570701A
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beams
radiation
input
output
laser
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Jersey Nuclear Avco Isotopes Inc
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/10—Beam splitting or combining systems
    • G02B27/14—Beam splitting or combining systems operating by reflection only
    • G02B27/144—Beam splitting or combining systems operating by reflection only using partially transparent surfaces without spectral selectivity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D59/00—Separation of different isotopes of the same chemical element
    • B01D59/34—Separation by photochemical methods
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/10—Beam splitting or combining systems
    • G02B27/1006—Beam splitting or combining systems for splitting or combining different wavelengths
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/10—Beam splitting or combining systems
    • G02B27/14—Beam splitting or combining systems operating by reflection only
    • G02B27/145—Beam splitting or combining systems operating by reflection only having sequential partially reflecting surfaces
    • 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
    • H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Plasma & Fusion (AREA)
  • Engineering & Computer Science (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biophysics (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Lasers (AREA)
  • Laser Beam Processing (AREA)

Description

(54) SYSTEM FOR COMBINING LASER BEAMS OF DIVERSE FREQUENCIES (71) We, JERSEY NUcLEAR-Avco ISOTOPES, INC. a Corporation of the State of Delaware, United States of America of 777 106th Avenue Northeast, C-00777, Bellevue, Washington 98009, United States of America do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed to be particularly described in and by the following statement:- The present invention relates to laser optics and in particular to an optical system for combining laser beams.
In isotope separation by isotopically selective photoexcitation of one isotope in an environment of plural isotopes, as for example discussed in United States Patent 3,772,519, it is common to find a plurality of laser beams separately generated. It is desired to combine these into a composite beam having components from each of the separate laser beams. It is known that laser beams, or radiation in general, of differing frequencies in separate beams may be combined onto a single path having colinear superimposed beams composed of components of each of the original beams by the use of dichroic elements. Additionally, it is known as, for example, discussed in United States Patent 3,924,937, that a plurality of laser beams of pulsed radiation having sequentially triggered pulses in each beam may be combined using a system of rotating optics.
For high power appliactions, the losses inherent in dichroic elements, particularly when combining laser beams of closely spaced frequency, will reduce the efficiency, or power available in the combined beams.
Similarly, the use of rotating optics to provide beam combining in the case of time sequenced, pulse beams while feasible, presents an element of mechanical complexity which it might be preferable to avoid.
In the present invention, an optical system of passive and stationary elements is employed to combine the radiation from a plurality of spacially distinct beams so that a plurality of composite beams result. Each composite beam contains colinear and superimposed beam components from each of the original, distinct laser beams. The system can also provide power splitting of the energy in the distinct beams into the equal components in each of the composite beams so that each component in a single composite beam can represent the same percentage of the energy as in the original input beam.
According to a first aspect of the invention there is provided a system for combining laser beams of diverse frequencies into a plurality of beams, each comprising laser radiation having components of each of said diverse frequencies, said system comprising a plurality, greater than two, of sources of laser radiation including at least first and second sets of sources: said plurality of sources of laser radiation providing respective input beams of laser radiation of different frequencies; a plurality of beam splitting elements positioned to receive on one surface of each radiation input beams from said first set of sources and to receive on the second surface of each the radiation input beams from said second set of sources; said first plurality of beam splitting elements providing a plurality of sets of composite beams of radiation comprising a first set of composite beams including a fraction of the radiation from said first set of sources superimposed on a fraction of the radiation from said second set of sources; a second set of composite beams comprising a fraction of the radiation from said first set of sources superimposed on a fraction of the radiation from said second set of sources; and a further plurality of beam splitting elements responsive to the plurality of sets of composite beams for providing a set of output beams, each beam thereof having a fraction of the radiation in each of the input beams from said first and second sets of sources.
According to a second aspect of the in vention there is provided a system for com binging a multiplicity of beams of laser radiation of diverse frequencies to provide a multiplicity of output beams of laser radia tion, each output beam including a com ponent from each of said multiplicity of beams of diverse frequencies, said system comprising means for providing said multi plicity of laser beams of diverse frequencies; a first plurality of beam splitters each re ceiving on different surfaces thereof respec tive laser radiation from said multiplicity of beams and providing a set of output beams, the output beams from each beam splitter including in combination all of the frequencies of laser radiation applied to the surfaces thereof; and a further plurality of further beam splitters each positioned to receive different laser radiation of combined frequencies from a plurality of beam splitters other than said further plurality of beam splitter elements on respective surfaces there of and to provide a further set of output beams of laser radiation each of the further set of output beams of laser radiation includ ing laser radiation of each frequency in said multiplicity of beams.
According to a further aspect of the in vention there is provided a system for com bining laser beams of diverse frequencies into a plurality of beams, each comprising laser radiation having components of each of said diverse frequencies, said system com prising a plurality of sources of laser radia tion including at least first and second sources: said plurality of sources of laser radiation providing respective first and second input beams of laser radiation of different frequencies; at least one beam splitting element positioned to receive on one surface radiation from said first source of said plurality of sources and to receive on the second surface thereof the laser radia tion from said second source of laser radia tion of said plurality of sources; said beam splitting element providing a plurality of output beams comprising a first output beam including a fraction of the radiation in said first input beam superimposed on a frac tion of the radiation in said second input beam; and a second output beam compris ing a fraction of the radiation in said first input beam second superimposed on a frac tion of the radiation in said second input beam; and a plurality of parallel channels of uranium vapor receiving each of said out put beams.
Embodiments of the present invention will now be described by way of example with reference to the accompanying drawings of which: Fig. 1 is a diagram of a prior art technique for combining laser beams; Fig. 2 is a pictorial view of the technique of the present invention for combining two laser beams; and Fig. 3 is a diagram of an array according to the present invention for combining a greater number of laser beams.
The present invention contemplates a system of one or more passive, stationary beam splitting elements for combining the radiation from a plurality of separate, spacially distinct laser beams into combined beams each having components of all of the input laser beams. The use of beam splitters in accordance with the teaching of the present invention permits the realization of a high efficiency beam combining system, particularly for combining beams of different, but only slightly different frequencies. The present invention avoids the losses inherent in the use of dichroic elements for the combination of beams as, for example, shown in another technique in Fig. 1, or the additional elements required with rotating optics.
According to a technique which might be employed to combine beams of laser radiation illustrated in Fig. 1, a set of dichroic elements 12, 14 and 16 may be employed to combine four beams 18, 20, 22 and 24 of laser radiation, each having the same power level P (or different power levels as desired) at distinct frequencies, F1, F2, F3 and F4.
Mirrors 26, 28 and 30 are shown in use to direct radiation for proper application to each of the dichroic elements 12, 14 and 16.
There results from the system of combining optics, a composite beam 32 combining the components of all of the input beams 18, 20, 22 and 24.
For isotope separation, particularly uranium enrichment, according to the technique shown in the above referenced Patent 3,772,519, it may then be desired to divide the power in the beam 32 into separate beams having identical spectral content but sharing the power in the beam 32 in order to excite various portions of the uranium vapor simultaneously. A set of beam splitters 34, 36 and 38 are employed with reflecting mirrors 40 and 42 to split the beam into four separate beams 44, 46, 48 and 50, each having components at the frequencies F1, F2, F3 and F4 and one quarter of the power at each frequency as in the input beams 18, 20, 22 and 24.
In addition to the use of a large number of optical elements for the beam combining and splitting system of Fig. 1, all of which require precise and stable optical alignment, the use of dichroic elements 12, 14 and 16 introduces a significant loss inherent in the dielectric layers patricularly where the fre quencies F1, F2, F3 and F4 are closely spaced as may be the case where the laser beams are employed in isotope separation.
The same results of combined and power split radaition may be achieved more simply and with less potential energy loss in the incident laser beams using a beam splitter concept as illustrated basically in Fig. 2.
As shown there, a beam splitter 52 which is typically 50% reflecting and 50% transmitting and typicaly consisting of a multilayer dielectric element (or thin metal film element) is provided to receive radiation in input laser beams 54 and 56 on opposite surfaces. The fabrication of such a beam splitter is well known in the art. The radiations in the beams 54 and 56 are of different frequencies, F1 and F2, which may be selected for producing excitation of an isotope between different energy states in a process of isotopically selective ionization as described in the above-referenced Patent 3,772,519. The power, P, in each beam is typically the same, but need not be so. The radiation in the beam 54 having a power, P, is divided between an output beam 58 containing one half of the power, P, and an output beam 60 containing the other half of the power, P, in the beam 54. The beam 58 will also contain a component of transmitted energy from the input beam 56 and the output beam 60 will contain a component of reflected radiation from the input beam 56, each at a power level of one half P.
The two output beams 58 and 60 will each contain equal components of the radiation of the input beams 54 and 56, typically half the power in each input beam. Each component in the output beams 58 and 60 will be completely superimposed upon and colinear with the other beam and only slightly displaced therefrom due to the dispersive properties of the beam splitter 52.
A beam splitter array for combining and power splitting a multiplicity of input beams as might be used in isotope separation is more completely illustrated in Fig. 3. As shown there, the array consists of four beam splitter elements 62, 64, 66 and 68 positioned to combine the output radiation of four lasers 70, 72, 74 and 76, each of different frequencies, F1, F2, F3 and F4.
While shown for use with four lasers, the array of Fig. 3 may be employed with a lesser number, such as three, as desired.
The radiation from the lasers 70 and 72 is applied to opposite surfaces of the beam splitter 62 as input beams 78 and 80. The resulting output beams 82 and 84each have component beams at the frequencies F1 and F2 at half the power level, P, of the original input beams~78 and 80. Similarly, the radiation from the lasers 74 and 76 are applied as input beams 86 and 88 to opposite sur faces of the beam splitter 66 to provide resultant output beams 90 and 92. The beams 82 and 92 are diretced toward beam splitter 68 on opposite surfaces for combining into beams 94 and 96. Beams 84 and 90 are directed toward beam splitter 64 on opposite surfaces for combining into output beams 98 and 100.
Each of the four output beams 94, 96, 98, 100 contains a quarter of the power of each input beam 78, 80, 86, 88 and thus is a composite beam containing each of the colors or frequencies generated by the lasers 70, 72, 74, 76. No elements except four beam splitters are required for this exemplary system and these may be made to operate with very low losses.
The four output beams 94, 96, 98 and 100 are then advantageously applied through parallel enrichment channels 102, 104, 106, 108 respectively which may be spaced regions of a uranium isotope separation chamber or separate chambers as shown in the above patent or in U.S. Patent Serial No. 3 939 354.
WHAT WE CLAIM IS: 1. A system for combining laser beams of diverse frequencies into a plurality of beams, each comprising laser radiation having components of each of said diverse frequencies, said system comprising: a first plurality, greater than two, of sources of laser radiation including at least first and second sets of sources; said plurality of sources of laser radiation providing respective input beams of laser radiation of different frequencies; a plurality of beam splitting elements positioned to receive on one surface of each radiation input beams from said first set of sources and to receive on the second surface of each the radiation input beams from said second set of sources; said first plurality of beam splitting - elements providing a plurality of sets of composite beams of radiation comprising: a first set of composite beams including a fraction of the radiation from said first set of sources superimposed on a fraction of the radiation from said second set of sources; a second set of composite beams comprising a fraction of the radiation from said second set of sources; and a further plurality of beam splitting eTe- ments responsive to the plurality of sets-of composite beams for providing a set of output beams, each beam thereof having a fraction of the radiation in each of the input beams from said first and second sets of sources.
2. The system of claim 1 wherein the fractions of radiation from each source
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (16)

  1. **WARNING** start of CLMS field may overlap end of DESC **.
    dielectric layers patricularly where the fre quencies F1, F2, F3 and F4 are closely spaced as may be the case where the laser beams are employed in isotope separation.
    The same results of combined and power split radaition may be achieved more simply and with less potential energy loss in the incident laser beams using a beam splitter concept as illustrated basically in Fig. 2.
    As shown there, a beam splitter 52 which is typically 50% reflecting and 50% transmitting and typicaly consisting of a multilayer dielectric element (or thin metal film element) is provided to receive radiation in input laser beams 54 and 56 on opposite surfaces. The fabrication of such a beam splitter is well known in the art. The radiations in the beams 54 and 56 are of different frequencies, F1 and F2, which may be selected for producing excitation of an isotope between different energy states in a process of isotopically selective ionization as described in the above-referenced Patent 3,772,519. The power, P, in each beam is typically the same, but need not be so. The radiation in the beam 54 having a power, P, is divided between an output beam 58 containing one half of the power, P, and an output beam 60 containing the other half of the power, P, in the beam 54. The beam 58 will also contain a component of transmitted energy from the input beam 56 and the output beam 60 will contain a component of reflected radiation from the input beam 56, each at a power level of one half P.
    The two output beams 58 and 60 will each contain equal components of the radiation of the input beams 54 and 56, typically half the power in each input beam. Each component in the output beams 58 and 60 will be completely superimposed upon and colinear with the other beam and only slightly displaced therefrom due to the dispersive properties of the beam splitter 52.
    A beam splitter array for combining and power splitting a multiplicity of input beams as might be used in isotope separation is more completely illustrated in Fig. 3. As shown there, the array consists of four beam splitter elements 62, 64, 66 and 68 positioned to combine the output radiation of four lasers 70, 72, 74 and 76, each of different frequencies, F1, F2, F3 and F4.
    While shown for use with four lasers, the array of Fig. 3 may be employed with a lesser number, such as three, as desired.
    The radiation from the lasers 70 and 72 is applied to opposite surfaces of the beam splitter 62 as input beams 78 and 80. The resulting output beams 82 and 84each have component beams at the frequencies F1 and F2 at half the power level, P, of the original input beams~78 and 80. Similarly, the radiation from the lasers 74 and 76 are applied as input beams 86 and 88 to opposite sur faces of the beam splitter 66 to provide resultant output beams 90 and 92. The beams
    82 and 92 are diretced toward beam splitter
    68 on opposite surfaces for combining into beams 94 and 96. Beams 84 and 90 are directed toward beam splitter 64 on opposite surfaces for combining into output beams 98 and 100.
    Each of the four output beams 94, 96, 98, 100 contains a quarter of the power of each input beam 78, 80, 86, 88 and thus is a composite beam containing each of the colors or frequencies generated by the lasers 70, 72, 74, 76. No elements except four beam splitters are required for this exemplary system and these may be made to operate with very low losses.
    The four output beams 94, 96, 98 and 100 are then advantageously applied through parallel enrichment channels 102, 104, 106, 108 respectively which may be spaced regions of a uranium isotope separation chamber or separate chambers as shown in the above patent or in U.S. Patent Serial No. 3 939 354.
    WHAT WE CLAIM IS: 1. A system for combining laser beams of diverse frequencies into a plurality of beams, each comprising laser radiation having components of each of said diverse frequencies, said system comprising: a first plurality, greater than two, of sources of laser radiation including at least first and second sets of sources; said plurality of sources of laser radiation providing respective input beams of laser radiation of different frequencies; a plurality of beam splitting elements positioned to receive on one surface of each radiation input beams from said first set of sources and to receive on the second surface of each the radiation input beams from said second set of sources; said first plurality of beam splitting - elements providing a plurality of sets of composite beams of radiation comprising: a first set of composite beams including a fraction of the radiation from said first set of sources superimposed on a fraction of the radiation from said second set of sources; a second set of composite beams comprising a fraction of the radiation from said second set of sources; and a further plurality of beam splitting eTe- ments responsive to the plurality of sets-of composite beams for providing a set of output beams, each beam thereof having a fraction of the radiation in each of the input beams from said first and second sets of sources.
  2. 2. The system of claim 1 wherein the fractions of radiation from each source
    appearing in said output beams are approximately equal.
  3. 3. The system of claim 1 wherein the fraction of radiation from each source appearing in said output beams are not equal.
  4. 4. The system of claim 1 wherein the fractions of beams comprising each of said output beams are colinear.
  5. 5. The system of claim 1 wherein each beam splitting element includes a multidielectric layer element.
  6. 6. The system of claim 1 wherein each beam splitting element includes a thin metal layer element.
  7. 7. The system of claim 1 wherein the power in each of said input beams is approximately equal.
  8. 8. The system of claim 1 wherein the power in each of said input beams is different.
  9. 9. The system of claim 1 including a plurality of parallel channels of uranium vapor receiving each of said output beams.
  10. 10. The system of claim 9 wherein said plurality of parallel channels include an isotope separation chamber.
  11. 11. The system of claim 1 wherein: said plurality of sources number at least four to provide at least four input beams of laser radiation; at least two beam splitting elements are provided in each plurality, the first plurality thereof responding to said at least four input beams to provide at least four composite beams each having the radiation from a different combination of two input beams therein and the further plurality of said beam splitting elements responding to the composite beams of said first plurality of beam splitting elements to provide at least four output beams, each containing the radiation from all of said at least four input beams.
  12. 12. A system for combining a multiplicity of beams of laser radiation of diverse frequencies to provide a multiplicity of output beams of laser radiation, each output beam including a component from each of said multiplicity of beams of diverse frequencies, said system comprising means for providing said multiplicity of laser beams of diverse frequencies; a first plurality of beam splitters each receiving on different surfaces thereof respective laser radiation from said multiplicity of beams and providing a set of output beams, the output beams from each beam splitter including in combination all of the frequencies of laser radiation applied to the surfaces thereof; and a further plurality of further beam splitters each positioned to receive different laser radiation of combined frequencies from a plurality of beam splitters other than said further plurality of beam splitter elements on respective surfaces thereof and to provide a further set of output beams of laser radiation each of the further set of output beams of laser radiation including laser radiation of each frequency in said multiplicity of beams.
  13. 13. The system as claimed in any one of claims 1 to 12 further including a plurality of parallel channels of uranium vapour receiving each of said output beams.
  14. 14. A system for combining laser beams of diverse frequencies into a plurality of beams, each comprising laser radiation having components of each of said diverse frequencies, said system comprising: a plurality of sources of laser radiation including at least first and second sources; said plurality of sources of laser radiation providing respective - first and second input beams of laser radiation of different frequencies; at least one beam splitting element positioned to receive on one surface radiation from said first source of said plurality of sources and to reecive on the second surface thereof the laser radiation from said second source of laser radiation of said plurality of sources; said beam splitting element providing a plurality of output beams comprising: a first output beam including a fraction of the radaition in said first input beam superimposed on a fraction of the radiation in said second input beam; and a second output beam comprising a fraction of the radiation in said first input beam second superimposed on a fraction of the radiation in said second input beam; and a plurality of parallel channels of uranium vapor receiving each of said output beams.
  15. 15. The system of claim 14 wherein said plurality of parallel channels include an isotope separation chamber
  16. 16. A system for combining laser beams of diverse frequencies into a plurality of beams each containing radiation of each of the input frequencies, substantially as hereinbefore described with reference to Figure 2 or 3 of the accompanying drawings.
GB38534/76A 1976-02-23 1976-11-17 System for combining laser beams of diverse frequencies Expired GB1570701A (en)

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BE (1) BE847105A (en)
CA (1) CA1077606A (en)
CH (1) CH614074A5 (en)
DE (1) DE2648271A1 (en)
ES (1) ES452165A1 (en)
FR (1) FR2341873A1 (en)
GB (1) GB1570701A (en)
IL (1) IL50516A (en)
IT (1) IT1074611B (en)
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2132787A (en) * 1982-11-06 1984-07-11 Nippon Infrared Ind Mixing laser beams
GB2151808A (en) * 1983-12-20 1985-07-24 Alfa Romeo Auto Spa Holed mirror system for the flexible composition of laser beams

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4073572A (en) * 1976-02-23 1978-02-14 Jersey Nuclear-Avco Isotopes, Inc. System for increasing laser pulse rate with beam splitters
FR2498752B1 (en) * 1981-01-23 1985-07-05 Thomson Csf OPTICAL RECORDING DEVICE READING AN INFORMATION MEDIUM COMPRISING TWO LASER SOURCES OF DIFFERENT WAVELENGTHS
JPS5886787A (en) * 1981-11-19 1983-05-24 Nippon Sekigaisen Kogyo Kk Laser emitting device
FR2591510B1 (en) * 1985-03-29 1988-03-04 Commissariat Energie Atomique SYSTEM FOR PROVIDING SELECTIVE REACTION IN PHOTOCHEMICAL PROCESSES FROM LASER BEAMS, INCLUDING MEANS FOR DISTRIBUTING SUCH BEAMS.
FR2603427B1 (en) * 1986-08-29 1989-03-24 B M Ind Sa OPTICAL CONFIGURATION FOR LASER PULSE MULTIPLEXING
US5165080A (en) * 1987-09-11 1992-11-17 British Telecommunications Public Limited Company Optical distributor
GB8721472D0 (en) * 1987-09-11 1987-10-21 British Telecomm Optical distributor
FR2628004B1 (en) * 1988-03-02 1991-09-20 Commissariat Energie Atomique LASER BEAM DISTRIBUTION DEVICE FOR USE IN A LASER ISOTOPIC SEPARATION PROCESS
JP6805688B2 (en) * 2016-09-29 2020-12-23 住友電気工業株式会社 Light source module

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3671747A (en) * 1970-03-30 1972-06-20 Bell Telephone Labor Inc Picosecond optical apparatus utilizing optically induced birefringence in solids
US4038549A (en) * 1973-06-08 1977-07-26 Jersey Nuclear-Avco Isotopes, Inc. Isotopically selective excitation from plural excited states
US4070580A (en) * 1976-02-17 1978-01-24 Stanford Research Institute Method and apparatus for field ionization for isotope separation
US4073572A (en) * 1976-02-23 1978-02-14 Jersey Nuclear-Avco Isotopes, Inc. System for increasing laser pulse rate with beam splitters

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2132787A (en) * 1982-11-06 1984-07-11 Nippon Infrared Ind Mixing laser beams
GB2151808A (en) * 1983-12-20 1985-07-24 Alfa Romeo Auto Spa Holed mirror system for the flexible composition of laser beams

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SE7610454L (en) 1977-08-24
NL7611307A (en) 1977-08-25
IT1074611B (en) 1985-04-20
DE2648271A1 (en) 1977-08-25
JPS52101996A (en) 1977-08-26
CH614074A5 (en) 1979-10-31
AU510203B2 (en) 1980-06-12
AU1811576A (en) 1978-04-06
SE416601B (en) 1981-01-19
BE847105A (en) 1977-01-31
FR2341873A1 (en) 1977-09-16
CA1077606A (en) 1980-05-13
IL50516A (en) 1978-09-29
ES452165A1 (en) 1977-12-01

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