WO1991005382A1 - Scaleable, fibre laser bundle regenerative amplifier system - Google Patents
Scaleable, fibre laser bundle regenerative amplifier system Download PDFInfo
- Publication number
- WO1991005382A1 WO1991005382A1 PCT/AU1990/000460 AU9000460W WO9105382A1 WO 1991005382 A1 WO1991005382 A1 WO 1991005382A1 AU 9000460 W AU9000460 W AU 9000460W WO 9105382 A1 WO9105382 A1 WO 9105382A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- laser
- amplifiers
- pulse
- amplifier
- fibre
- Prior art date
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
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/07—Construction or shape of active medium consisting of a plurality of parts, e.g. segments
-
- 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
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/0941—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a laser diode
-
- 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
- H01S3/23—Arrangements of two or more lasers not provided for in groups H01S3/02 - H01S3/22, e.g. tandem arrangements of separate active media
- H01S3/2383—Parallel arrangements
-
- 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
- H01S3/23—Arrangements of two or more lasers not provided for in groups H01S3/02 - H01S3/22, e.g. tandem arrangements of separate active media
- H01S3/2308—Amplifier arrangements, e.g. MOPA
- H01S3/2325—Multi-pass amplifiers, e.g. regenerative amplifiers
- H01S3/235—Regenerative amplifiers
Definitions
- This invention relates to a scaleable, phase locked, regenerative amplifier system consisting of two looped, phased locked, fiber bundle laser amplifiers positioned output face to output face with a polarizing beam splitter positioned in between said faces and an electro-optic switch placed near each of the said faces.
- micro lens array is positioned between said output face and the electro-optic 0 switch to match the emissions from each of the individual fiber cores into a parallel, phase locked laser beam.
- the injected polarized laser beam is reflected into the invention via the input face of a polarizing beam splitter and is directed through the electro-optic switch into the said fiber laser bundle from which it 5 emerges in an amplified form and has its plane of polarization rotated a further 45° as it passes back through the still activated electro-optic cell.
- the laser pulse With a 90° shift in the orientation " of its plane of polarization, the laser pulse then passes through the polarized beam splitter onto an identical looped fiber amplifier configuration o whose electro-optic switch is not activated. The pulse is then trapped in the amplifier passing to and fro between its Two end sections where it is amplifier further.
- the second electro-optic switch is activated and the amplified laser pulse is ejected out of the invention.
- the invention can be scaled to aperture diameters of more than one meter capable of emitting laser pulses in excess of 1015 watts peak power.
- the invention has applications in the industrial, scientific and defence fields whenever high peak power laser beams are required.
- Prior art regenerative amplifier systems are not scaleable to the high power level capabilities of which they should be capable of. Also, prior art regenerative amplifiers did not involve having lengths of gain media which could be rapidly excited during the transit time of the laser pulse undergoing amplification within ⁇ o those prior art systems.
- the invention is scaleable to large beam diameters exceeding one meter if i diameter and more than 1015 watts in peak output power, a capability completely beyond prior art regenerative amplifier systems.
- This invention provides an alternative technology for the amplification of laser pulses to very high peal € power levels using ⁇ o the regenerative amplifier approach where the laser gain medium is in the form of phase locked optical fibre bundles which are optically excited using arrays of laser diodes.
- the invention amplifies an input laser pulse by first of all rotating its plane of polarisation through 90° thus trapping the said 5 pulse between two activated laser amplifiers or a laser amplifier and a 100% reflecting mirror which can replace one of the said amplifiers. After the laser pulse has been amplified to the required power level, its plane of polarisation is changed again by 90° so that it can be emitted from the amplifier system via the rear face o of the polarising beam splitter used 1o input the said pulse into the amplifier system originally.
- the invention allows a laser pulse to be amplified to very high power levels by multiple passages through the same amplifiers rather than a cascade of amplifiers. In this way, only two large 5 amplifiers or one large amplifier and a plane mirror are needjsd to boost the power of laser pulses to levels well in excess of 10 " ! 5 watts peak. To handle such high power laser beams needs large diameter optics and this requirement has held up the development of regenerative amplifiers in the past. With the advent of diode pumped fibre bundle lasers this situation is now changed with phase locked arrays of fibres and electro-optic switches providing the large scale optical structures necessary to handle such high laser pulse powers.
- Another object of the invention is to provide laser amplifiers in the form of phase locked fiber bundles, the optically polished ends of the individual fibres from said bundles being coupled to arrays of micro lenses which collinate the fibre output beams into a phase-locked, large diameter laser beam.
- Another object of the invention is to provide additional end pumping of the laser fibre bundle amplifiers in the case where the said amplifiers are double ended.
- Figure 2 we show the format of the invention which represents an assembly of the basic units shown in Figure 1 and able to amplify phase locked input laser beams to very high power levels.
- Rgure 3 we show a straight bundle configuration of the present invention.
- numeral 1 indicates a bundle of single mode optical fibers doped with lasing ions.
- Numeral 2 indicates the array of optically polished end faces of the individual fiber loops.
- Numeral 3 indicates a micro lens array whilst numeral 4 indicates an electro-optic switch to rotate the plane of polarization of the laser beam being amplified in the invention.
- Numeral 5 indicates an array of semiconductor light sources or similar light sources emitting narrow spectral bandwidth pump light which matches the absorption bands of laser fiber 1.
- Numeral 6 indicates the power
- numeral 7 indicates the input laser pulse to be amplified by the invention whilst numeral 8 indicates a polarized beam splitter which directs the input pulse 7 into the invention to pass through activated electro-optic switch 4, through the micro ⁇ o lens array 3 and into the looped laser fiber bundle 1 which is where it is amplified and spatially filtered.
- optic switch 4 The pulse is then amplified as it transverse the end amplifiers. When the required amplification level has been attained, electro-optic switch 4 is activated rotating the plane of polarization of the pulse to its original orientation so that it is reflected off polarizer 8 as output beam 9.
- numeral 10 indicates a group of phase locked laser beams to be amplified in the invention.
- Numeral 11 indicates a polarized beam splitter which directs the input beam 10 into the invention. Beam 10 then passes through an array of electro-optic switches indicated by numeral 12, which matches the group of
- the activated array 12 rotates the plane of polarization of each of the laser beams forming the phase locked input beam 10, by 45° .
- Each of said beams in phase locked beam 10 is then passed through the array of micro lenses 3 and matched to the cores of the fiber ends 2 making up fiber bundles 1 which are stacked together, each of the said bundles 1 being optically excited with diode arrays indicated by numeral 13, which 5 are powered by the supply indicated by numeral 14.
- Numeral 15 indicates a mirror to reflect any excitation light from diode array 13 back into each of the fiber bundles 1.
- the plane of polarization of the laser beam is rotated ⁇ o a further 45° so that it passes through the polarized beam splitter 11 to pass through the inactivated electro-optic switch array 12 into an identical end amplifier fiber bundle assembly where the laser beam is amplified further.
- the pulse is then amplified as it transverses the invention and when the required amplification has 5 been attained, electro-optic switch array 12 is activated, rotating the plane of polarization of the said laser beam to its original state so that said beam is ejected out of the invention as the output beam indicated by numeral 16.
- numeral 17 indicates a fiber laser bundle with 0 optically polished, mirrored ends indicated by numeral 18 through which additional excitation light generated by the diode array • indicated by numeral 19 whose electrical power supply is indiea ed by numeral 20 enters the laser gain medium 17.
- the invention has application in the industrial, medical, 5 defence and the research and development fields with particular relevance to the laser fusion and laser fadar fields.
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Lasers (AREA)
Abstract
This invention relates to a regenerative laser amplifier system consisting of two phase locked fibre bundle laser amplifiers (1) whose optically polished ends (2) are coupled via the microlens array (3) into the electro-optic switch (4). The said amplifiers are side excited using diode arrays (5) driven by pulsed power supplies (6). The input pulse (7) to be amplified is reflected in the said system via the polarised beam splitter (8) and becomes trapped in the system by being polarisation rotated through 90° by switch (4). After amplification to the required power level, the switching process is reversed and the amplified pulse is ejected as output beam (9). The invention has application in the industrial, defense and scientific fields where laser pulses of very high peak powers are required.
Description
Scaleable, Fibre Laser Bundle Regenerative Amplifier System
Field of the Invention
This invention relates to a scaleable, phase locked, regenerative amplifier system consisting of two looped, phased locked, fiber bundle laser amplifiers positioned output face to output face with a polarizing beam splitter positioned in between said faces and an electro-optic switch placed near each of the said faces. In the case where the doped core of said optical fibers are much less in diameter that the cladding thickness, micro lens array is positioned between said output face and the electro-optic 0 switch to match the emissions from each of the individual fiber cores into a parallel, phase locked laser beam. The injected polarized laser beam is reflected into the invention via the input face of a polarizing beam splitter and is directed through the electro-optic switch into the said fiber laser bundle from which it 5 emerges in an amplified form and has its plane of polarization rotated a further 45° as it passes back through the still activated electro-optic cell. With a 90° shift in the orientation "of its plane of polarization, the laser pulse then passes through the polarized beam splitter onto an identical looped fiber amplifier configuration o whose electro-optic switch is not activated. The pulse is then trapped in the amplifier passing to and fro between its Two end sections where it is amplifier further. When the required level of amplification has been achieved, the second electro-optic switch is activated and the amplified laser pulse is ejected out of the invention. The invention can be scaled to aperture diameters of more than one meter capable of emitting laser pulses in excess of
1015 watts peak power. The invention has applications in the industrial, scientific and defence fields whenever high peak power laser beams are required.
Summary of the Prior Art
5 Prior art regenerative amplifier systems are not scaleable to the high power level capabilities of which they should be capable of. Also, prior art regenerative amplifiers did not involve having lengths of gain media which could be rapidly excited during the transit time of the laser pulse undergoing amplification within ι o those prior art systems.
The present invention overcomes the defects of prior art regenerative amplifiers by allowing the laser pulse to be amplified to spend a significant fraction of the transmit time within the laser gain medium which can be rapidly excited after being depleted
15 of stored energy by the pulse amplifying process. Also, the invention is scaleable to large beam diameters exceeding one meter if i diameter and more than 1015 watts in peak output power, a capability completely beyond prior art regenerative amplifier systems.
20 Background of the Invention
The amplification of laser pulses to high peak power levels has always presented a problem because no sooner than the problems are solved at a given power lever when the next level up the power scale presents new problems.
In general, laser pulses are amplified through cascades of individual amplifiers of increasing cross-sectional area. In 1967, the inventor proposed (Applied Optics, USA, August 1967) the use of an exponential amplifier to amplify laser pulses to very high peak 5 power levels in such a manner that the cross-section of the amplifier increased exponentially to maintain a constant flux density through the said amplifier.
This invention provides an alternative technology for the amplification of laser pulses to very high peal€ power levels using ι o the regenerative amplifier approach where the laser gain medium is in the form of phase locked optical fibre bundles which are optically excited using arrays of laser diodes. -
The invention amplifies an input laser pulse by first of all rotating its plane of polarisation through 90° thus trapping the said 5 pulse between two activated laser amplifiers or a laser amplifier and a 100% reflecting mirror which can replace one of the said amplifiers. After the laser pulse has been amplified to the required power level, its plane of polarisation is changed again by 90° so that it can be emitted from the amplifier system via the rear face o of the polarising beam splitter used 1o input the said pulse into the amplifier system originally.
The invention allows a laser pulse to be amplified to very high power levels by multiple passages through the same amplifiers rather than a cascade of amplifiers. In this way, only two large 5 amplifiers or one large amplifier and a plane mirror are needjsd to boost the power of laser pulses to levels well in excess of 10"! 5 watts peak. To handle such high power laser beams needs large
diameter optics and this requirement has held up the development of regenerative amplifiers in the past. With the advent of diode pumped fibre bundle lasers this situation is now changed with phase locked arrays of fibres and electro-optic switches providing the large scale optical structures necessary to handle such high laser pulse powers.
Summary of the Invention
It is an object of the invention to provide means of amplifying laser pulses to very high peak power levels using a minimal number of laser amplifiers.
Another object of the invention is to provide laser amplifiers in the form of phase locked fiber bundles, the optically polished ends of the individual fibres from said bundles being coupled to arrays of micro lenses which collinate the fibre output beams into a phase-locked, large diameter laser beam.
It is an object of the invention to provide phase locked, fibre bundle laser beam amplifiers which are side excited with t.ie output light from laser diode arrays.
Another object of the invention is to provide additional end pumping of the laser fibre bundle amplifiers in the case where the said amplifiers are double ended.
It is an object of the invention to provide laser amplifiers of scaleable diameters achieved by adding more fibres to said fibre bundle forming said amplifiers. Another object of the invention is to provide electro-optic switch arrays which are able to switch a phase locked array of
laser beams forming the main input and output beams.
It is an object of the invention to provide fibre bundle amplifiers with each amplifier composed of a single bundle of fibres. Another object of the invention is to provide fibre bundle amplifiers with each amplifier composed of groups of fibre bundle amplifiers whose output apertures are positioned an hexagonal array exhibiting a matching pattern for the electro-optic switch array.
Brief Description of the Drawings
A better understanding of the invention may be obtained from the following considerations taken in conjunction with the accompanying drawings which are not meant to limit the scope of the invention in any way. In Figure 1 , we show the basic unit of the invention whilst in
Figure 2 we show the format of the invention which represents an assembly of the basic units shown in Figure 1 and able to amplify phase locked input laser beams to very high power levels. In Rgure 3, we show a straight bundle configuration of the present invention.
Detailed Description of the Invention
In Figure 1 , numeral 1 indicates a bundle of single mode optical fibers doped with lasing ions. Numeral 2 indicates the array of optically polished end faces of the individual fiber loops. Numeral 3 indicates a micro lens array whilst numeral 4 indicates an electro-optic switch to rotate the plane of polarization of the laser
beam being amplified in the invention. Numeral 5 indicates an array of semiconductor light sources or similar light sources emitting narrow spectral bandwidth pump light which matches the absorption bands of laser fiber 1. Numeral 6 indicates the power
5 supply for diode array 5.
In Figure 1 , numeral 7 indicates the input laser pulse to be amplified by the invention whilst numeral 8 indicates a polarized beam splitter which directs the input pulse 7 into the invention to pass through activated electro-optic switch 4, through the micro ι o lens array 3 and into the looped laser fiber bundle 1 which is where it is amplified and spatially filtered.
On its return passage through 4, the plane of polarization is rotated a further 45° so the pulse passes through polarizer 8 into an identical end section which it enters via a deactivated electro-
15 optic switch 4. The pulse is then amplified as it transverse the end amplifiers. When the required amplification level has been attained, electro-optic switch 4 is activated rotating the plane of polarization of the pulse to its original orientation so that it is reflected off polarizer 8 as output beam 9.
20 In Figure 2, numeral 10 indicates a group of phase locked laser beams to be amplified in the invention. Numeral 11 indicates a polarized beam splitter which directs the input beam 10 into the invention. Beam 10 then passes through an array of electro-optic switches indicated by numeral 12, which matches the group of
25 laser beams in input beam 10. The activated array 12 rotates the plane of polarization of each of the laser beams forming the phase locked input beam 10, by 45° . Each of said beams in phase locked
beam 10 is then passed through the array of micro lenses 3 and matched to the cores of the fiber ends 2 making up fiber bundles 1 which are stacked together, each of the said bundles 1 being optically excited with diode arrays indicated by numeral 13, which 5 are powered by the supply indicated by numeral 14. Numeral 15 indicates a mirror to reflect any excitation light from diode array 13 back into each of the fiber bundles 1. On passing through the electro-optic switch array 12 after being amplified in the fiber bundle array, the plane of polarization of the laser beam is rotated ι o a further 45° so that it passes through the polarized beam splitter 11 to pass through the inactivated electro-optic switch array 12 into an identical end amplifier fiber bundle assembly where the laser beam is amplified further. The pulse is then amplified as it transverses the invention and when the required amplification has 5 been attained, electro-optic switch array 12 is activated, rotating the plane of polarization of the said laser beam to its original state so that said beam is ejected out of the invention as the output beam indicated by numeral 16.
In Figure 3, numeral 17 indicates a fiber laser bundle with 0 optically polished, mirrored ends indicated by numeral 18 through which additional excitation light generated by the diode array • indicated by numeral 19 whose electrical power supply is indiea ed by numeral 20 enters the laser gain medium 17.
The invention has application in the industrial, medical, 5 defence and the research and development fields with particular relevance to the laser fusion and laser fadar fields.
Claims
1 . A scalable laser beam regenerative amplifier system which can amplify a low powered input laser pulse to over 1015 watts peak power, said system consisting of:
5 a) Two, phase locked, looped fibre bundle laser amplifiers whose output apertures face each other so that the output of one can act as the input for the other. b) Laser diode arrays used to side pump the said fibre bundle amplifiers so that they are excited prior to the passage of said ι o laser pulses. c) A microlens array for collinating the outputs of the individual fibre ends forming the output aperture of said amplifiers so as to form a phase locked laser beam which then passes through an electro-optic switch which rotates the plan or polarisation
15 through an angle of 90. d) A polarised beam splitter positioned between the two said amplifiers such than an input pulse directed into the said regenerative amplifier system is able to traverse the said polariser without loss after being rotated through an angle of
20 90 via polarisation through said optical switch. e) Two optical switches, one placed either side of said polariser, end of the said switches rotating the plane of polarisation of the passing laser pulse by 90 initially to trap the said pulse within said amplifier and subsequently to allow said laser
25 pulse to be ejected from said system after allowing required level of amplification.
2. A system as claimed in claim 1 where the single fibre amplifiers are replaced with an array of laser fibre amplifier bundles, the output aperture of which are placed in a hexagonal ring.
3. A system as claimed in claim 1 where the fibre bundle amplifier is double ended, said fibres being optically excited vis the end faces.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU64471/90A AU656123B2 (en) | 1989-09-27 | 1990-09-28 | Scaleable, fibre laser bundle regenerative amplifier system |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AUPJ6578 | 1989-09-27 | ||
| AUPJ657889 | 1989-09-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1991005382A1 true WO1991005382A1 (en) | 1991-04-18 |
Family
ID=3774233
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/AU1990/000460 WO1991005382A1 (en) | 1989-09-27 | 1990-09-28 | Scaleable, fibre laser bundle regenerative amplifier system |
Country Status (1)
| Country | Link |
|---|---|
| WO (1) | WO1991005382A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1991017594A1 (en) * | 1990-05-08 | 1991-11-14 | Australian Electro Optics Pty. Ltd. | Regenerative amplifier with phase locked laser rod arrays |
| AU646465B2 (en) * | 1990-05-08 | 1994-02-24 | Australian Electro Optics Pty. Limited | Regenerative amplifier with phase locked laser rod arrays |
| US5351259A (en) * | 1991-10-24 | 1994-09-27 | Mitsubishi Denki Kabushiki Kaisha | Semiconductor laser-pumped solid-state laser with plural beam output |
| US6061378A (en) * | 1997-05-13 | 2000-05-09 | Cutting Edge Optronics, Inc. | Multiple resonant cavity solid-state laser |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3471215A (en) * | 1965-07-16 | 1969-10-07 | American Optical Corp | Fiber laser device provided with long flexible energy-directing probe-like structure |
| AU3874285A (en) * | 1984-02-15 | 1985-08-22 | Laser Holdings Limited | Composite laser oscillator |
| WO1989011172A1 (en) * | 1988-05-03 | 1989-11-16 | Phased Array Lasers Pty. Ltd. | Looped, phased array laser oscillator |
| WO1990000320A1 (en) * | 1988-07-04 | 1990-01-11 | Phased Array Lasers Pty Ltd | Face pumped, looped fibre bundle, phased-array laser oscillator |
-
1990
- 1990-09-28 WO PCT/AU1990/000460 patent/WO1991005382A1/en unknown
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3471215A (en) * | 1965-07-16 | 1969-10-07 | American Optical Corp | Fiber laser device provided with long flexible energy-directing probe-like structure |
| AU3874285A (en) * | 1984-02-15 | 1985-08-22 | Laser Holdings Limited | Composite laser oscillator |
| WO1989011172A1 (en) * | 1988-05-03 | 1989-11-16 | Phased Array Lasers Pty. Ltd. | Looped, phased array laser oscillator |
| WO1990000320A1 (en) * | 1988-07-04 | 1990-01-11 | Phased Array Lasers Pty Ltd | Face pumped, looped fibre bundle, phased-array laser oscillator |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1991017594A1 (en) * | 1990-05-08 | 1991-11-14 | Australian Electro Optics Pty. Ltd. | Regenerative amplifier with phase locked laser rod arrays |
| AU646465B2 (en) * | 1990-05-08 | 1994-02-24 | Australian Electro Optics Pty. Limited | Regenerative amplifier with phase locked laser rod arrays |
| US5351259A (en) * | 1991-10-24 | 1994-09-27 | Mitsubishi Denki Kabushiki Kaisha | Semiconductor laser-pumped solid-state laser with plural beam output |
| GB2261318B (en) * | 1991-10-24 | 1995-05-31 | Mitsubishi Electric Corp | Semiconductor laser pumped solid state laser |
| US6061378A (en) * | 1997-05-13 | 2000-05-09 | Cutting Edge Optronics, Inc. | Multiple resonant cavity solid-state laser |
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