GB2324645A - Single-mode solid-state diode-pumped lasers - Google Patents
Single-mode solid-state diode-pumped lasers Download PDFInfo
- Publication number
- GB2324645A GB2324645A GB9708499A GB9708499A GB2324645A GB 2324645 A GB2324645 A GB 2324645A GB 9708499 A GB9708499 A GB 9708499A GB 9708499 A GB9708499 A GB 9708499A GB 2324645 A GB2324645 A GB 2324645A
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- 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
- H01S3/0602—Crystal lasers or glass lasers
- H01S3/0604—Crystal lasers or glass lasers in the form of a plate or disc
-
- 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
- H01S3/09415—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a laser diode the pumping beam being parallel to the lasing mode of the pumped medium, e.g. end-pumping
-
- 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
- H01S3/0627—Construction or shape of active medium the resonator being monolithic, e.g. microlaser
-
- 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
- H01S3/08018—Mode suppression
- H01S3/08022—Longitudinal modes
- H01S3/08031—Single-mode emission
-
- 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
- H01S3/094049—Guiding of the pump light
- H01S3/094053—Fibre coupled pump, e.g. delivering pump light using a fibre or a fibre bundle
-
- 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
- H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
- H01S3/108—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering
- H01S3/109—Frequency multiplication, e.g. harmonic generation
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Lasers (AREA)
Abstract
A single mode solid-state laser comprises a laser crystal 20, e.g. Nd:YVO 4 , Nd:YAB or Nd:YSAG, end-pumped by a laser diode 10 via butt-coupled fibre 12. The optical cavity of the laser is defined between one flat face HR of the crystal which is coated to be highly reflective, and a partially reflective flat surface PR. The partially reflective flat surface PR may be a coating on a mirror 30, on the face of the crystal 20 opposite the face HR, or on a surface of a frequency-doubling crystal. In the last case, the coating on the surface PR reflects light at the fundamental frequency but transmits light at the doubled frequency, while the coating on the surface HR reflects light at both frequencies.
Description
BUTT-COUPLING PUMPED SINGLE-MODE SOLID-STATE LASERS
WITH FIBER-COUPLED DIODES
The present invention relates to diode-pumped solidstate lasers and, more particularly, to butt-coupling pumped single-mode solid-state lasers with fibercoupled diodes.
Previously, end pumping a laser gain material (or a laser crystal) with the output beam of laser diodes has been proposed. The laser diodes are closely spaced to the end of the laser gain material for efficient coupling of the pumping radiation into the laser gain material.
In typical diode-pumped solid-state laser, the profile of the exciting source (high-power diode laser) is a strip of divergence 1 pm in width and 200 - 500 jMn in length. Therefore, imaging elements such as coupling lens sets must be disposed between the pumping diode and the laser crystal to make the profile more symmetrical and direct the emanating beam to focus the laser crystal. However, two alignment operations are necessary for using lens to image the beam emanating from the pumping diode into the laser crystal. First, the imaging elements must be properly aligned with respect to the output facet of the pumping diode.
Second, the laser crystal must be properly aligned with diode-lens combination. Both of these operations require extra adjusting motions along three orthogonal axes so that the diode-pumped solid-state laser can produce good output power. The alignment mechanism is complicated and costly, so it is desirable to eliminate the alignment operation.
The cavity mechanism of a diode-pumped solid-state laser in general consists of a flat coupling mirror and a concave coupling mirror through alignment. The two coupling mirror are disposed at two ends of the laser crystal respectively. The cavity-assembling process must first aim the focal point of the concave mirror and then adjust the slant angles of the two coupling mirrors. The process for aiming the focal point of the concave mirror is very exacting, and thus it is desirable to eliminate such a process. Therefore, an easy to install laser system is quite in demand and necessary in practical applications.
A butt-coupled diode-pumped laser is disclosed in
U.S. Pat. NO. 4,847,815 to eliminate the necessary alignment operations in the pumped-diode solid-state laser above mentioned and provide an easy to install mechanism. However, the beam emanating from the highpower laser diode has a divergent light surface of strip shape. Consequently, when the laser crystal is excited by the pumping beam, a high-order transversemode oscillation will be generated, resulting in a single transverse laser with low output power. Further, the laser diode is so closely spaced to the laser crystal to excite the crystal that the heat emission from the pumping diode degrades the laser performance and efficiency.
The single longitudinal-mode laser is essential for a variety of applications. In order to obtain a single longitudinal-mode laser output, a microchip which serves as a cavity is disclosed by Zayhowski and
Mooradian in Opt. Lett. Vol. 14, pp. 24-26, 1989.
However, when the laser crystal is end pumped, a thermal lens effect is introduced. Because the cavity length is very short (about 1 mm), the mode-to-pump size ratio is less than 0.6, thereby resulting in highorder transverse mode oscillation. In addition, other devices such as frequency-doubling crystals and Qswitches can not be disposed in the cavity, and thus the applications are restricted.
The above mentioned diode-pumping solid-state lasers have the following drawbacks:
First, the setup of the laser system is complicated to align.
Second, the performance and efficiency of a buttcoupled diode-pumped solid-state laser will be degraded by the heat emission from the pumping diode.
Third, the cavity with a short length to generate single longitudinal-mode lasers will be disturbed by the thermal lens effect.
A simple way to provide a laser of single-transverse and longitudinal-mode operation is now disclosed. A fibercoupling diode is butt-coupled to a laser crystal to pump solid-state lasers in a flat-flat resonant optical cavity. A good overlap of laser mode and pump size can be obtained. Further, the thermal effects in the present cavity not only provide a stable resonant cavity with good overlap of laser mode and pump size but also enhance single frequency performance.
The principal objective of the present invention is to provide an improved diode-pumped single transversemode and single-longitudinal mode laser with high efficiency, power, and ease of installation.
In one feature of the present invention, the output facet of the fiber-coupling diode pump is butt-coupled (closely coupled) to an input facet of the laser crystal and the laser diode is well isolated from the laser crystal such that the heat emission from the diode pump will not influence the laser operation.
Another feature of the present invention is that a flat-flat resonant cavity is adopted such that the complicated process for aiming the focal point is eliminated and the set up of the laser system is easier and more accurate.
Another feature of the present invention is that the fiber-coupling diode is used to provide a pumping light source. The pumping light distribution displays good symmetry and the thermal-induced lens due to the thermal effect is circular-symmetrical. Therefore, the resonant optical cavity can be kept in a stable mechanism and the instability problem of the flat-flat cavity can be solved, and the laser crystal can be excited easily to emanate a single transverse-mode laser.
In another feature of the present invention, a good overlap of laser mode and pump size can be obtained.
To clarify the objectives, features, and advantages of the invention, embodiments are described hereinafter in accompaniment with the drawings.
Fig. 1 schematically illustrates one embodiment according to the present invention;
Fig. 2 schematically illustrates another embodiment according to the present invention; and
Fig. 3 schematically illustrates a further embodiment according to the present invention.
First embodiment
Fig. 1 shows an embodiment according to the present invention. In this embodiment, the output facet 11 of a fiber-coupled laser-diode 10 is mounted directly onto the laser crystal 20, as shown in Fig. 1. The laser crystal 20 can be selected from the following laser gain materials such as Nd:YVO4, Nd:YAB, and Nd:YSAG or any other active material with high absorptive characteristics. Here Nd:YVO4 is chosen as the laser crystal. The fiber-coupled laser diode (for example,
SDL-2372-P3) 10 serves as a pump source. The fibercoupled laser diode has a nominal output power of 1.2 W at 809 nm, a 100-pm-core fiber 12, and a -26" half width at l/e2 of the peak intensity. The pumping light is coupled to the laser crystal through a fiber 12 and thus the input facet of the laser crystal is well isolated from the pump diode such that the heat emission from pump diode will not degrade the laser performance.
The input facet of the crystal 20 is coated with highly reflective coating HR so as to be nominally reflecting the excited light at the fundamental wavelength and to serve as a reflecting mirror of the resonant optical cavity. The reflectivity of HR coating should be greater than 99.8%. The output facet of the crystal is coated with an anti-reflection coating AR the reflectivity of which should be less than 0.2% so as to keep the excited light at the fundamental wavelength emanating into the laser crystal as much as possible. A flat output-coupling mirror 30 is also covered with the partially reflective coating PR, for example, with a reflectivity of 90t, for partial reflecting at the fundamental wavelength.
The laser crystal 20 and the flat output-coupling mirror form a flat-flat resonant optical cavity.
Because the flat-flat resonant optical cavity does not require the focal point aiming process of the conventional flat-concave resonant optical cavity, the mechanism and assembly of the laser is very simple. The only adjustment required is to fit the slant angles for the laser crystal 20 and the flat output-coupling mirror 30.
fn addition, though the flat-flat resonant optical cavity is not very stable in conventional diode-pumped lasers, the circular-symmetrical thermal lens effect, resulting from using a fiber-coupled diode as pumping source, can improve the stability of the flat-flat resonant cavity mechanism with good overlap of laser mode and pump focus.
When the length LC of the flat-flat resonant cavity is between 0 and 50 mm, the mode-to-pump size ratio is about 1.0 - 2.0 and thus better overlap efficiency can be obtained. Consequently, the single-longitudinal mode laser can be generated easily.
From the experiment results, the thermal effect due to end pumping can improve the single longitudinal-mode operation in a flat-flat resonant optical cavity. When the laser crystal (Nd:YV04) is excited by a pump light source at a wavelength 809 nm with a power of 1.2 W, the crystal emanates laser output operating in single transverse mode and single longitudinal mode with a power of 620 mW at a wavelength of 1064 nm. The output power is about 5 - 6 times more than the expected output power according to the laser theorem.
Second embodiment
Furthermore, based on the first embodiment, when the length LC of the resonant optical cavity is set to 0 mm, a simpler flat-flat resonant optical cavity can be obtained by removing the output-coupling mirror 30 and the anti-reflection coating AR on the output facet of the laser crystal 20. Consequently, a simpler flat-flat resonant optical cavity, as shown in Fig. 2, only includes the laser crystal 20, the input and output facets of which are coated with the highly reflective coating HR and the partially reflective coating PR, respectively.
Third embodiment
Fig. 3 shows another embodiment according to the present invention to implement a frequency-doubling solid-state laser, wherein the flat-flat resonant optical cavity consists of the laser crystal 20 (Nd:YV04) and the frequency-doubling crystal 40. Parts similar to those identified with regard to the Fig. 1 are identified with the same reference numerals and their explanations are omitted.
In this embodiment, the mechanism is almost the same as that in Fig. 1, except that the flat output-coupling mirror 30 in Fig. 1 is replaced by a frequency-doubling crystal 40. In order to reduce the power loss, the additional flat output-coupling mirror is removed. The back-end of the frequency-doubling crystal 40 is coated with a bi-chromatic coating BF such that the pump light at the fundamental wavelength can be reflected back to the resonant cavity but the excited light at the second harmonic wavelength can pass through the coating to form laser outputs.
The input facet of the crystal 20 is coated with a highly reflective coating HR2 so as to be nominally reflecting the excited light at the fundamental wavelength and at the second harmonic wavelength. The
HR2 coating serves as a reflecting mirror of the resonant optical cavity. The reflectivity of HR2 coating should be greater than 99.8% at the fundamental wavelength and greater than 98% at the second harmonic wavelength. The output facet of the crystal 20 is coated with anti-reflection coating AR2 the reflectivity of which should be less than 0.2% so as to keep the excited light at the fundamental wavelength projecting into the laser crystal as much as possible.
The anti-reflection coating AR3 over the input facet of said frequency-doubling crystal is for the light at the fundamental wavelength and second harmonic wavelength.
When the length LC of the flat-flat resonant cavity is set to between 0 and 50 mm, the mode-to-pump size ratio is about 1.0 - 2.0 and thus better overlap efficiency can be obtained.
From the experimental results, when the laser crystal (Nd:YV04) is excited by a pump light source at a wavelength of 809 nm with a power of 1.2 W, a green laser of single transverse and longitudinal mode can be obtained. The output power of the green laser is greater than 200 mW.
This embodiment also has the advantages described in first embodiment which are not described for the sake of brevity.
According to the above description, he present invention has the following advantages over the conventional art: (1) high efficiency and output power, (2) simple mechanism for assembly, (3) a circular-symmetrical thermal lens effect for improving performance and flat-flat cavity stability, (4) good overlap of laser mode and pump size, (5)easy control for generating a single longitudinal-mode laser, and (6) good isolation for the heat emission from the pump diode.
Although the present invention has been described in terms of three specific embodiments, it is anticipated that alterations and modifications thereof will
become apparent to those skilled in the art. It is therefore intended that the following claims be interpreted as covering all such alternations and modifications as fall within the true spirit and scope of the invention.
Claims (19)
1. A butt-coupling pumped single-mode solid-state laser with fiber-coupled diodes comprising:
a fiber-coupled laser diode for producing end pumping light; and
a flat-flat resonant optical cavity including a laser crystal and a flat output-coupling mirror disposed away from said laser crystal by a specific distance;
wherein the output facet of said fiber-coupled laser diode is closely spaced to said laser crystal with a distance of less than a specific length, the input facet and output facet of said laser crystal are covered with a highly reflective coating and an antireflective coating respectively, the input facet of said flat output-coupling mirror is coated with a partially reflective coating, and the pumping light is directed into said laser crystal and a laser output emanates from said output-coupling mirror.
2. The laser as in claim 1, wherein said specific length between the output facet of said fiber-coupled laser diode and said laser crystal must be less than 1 mm.
3. The laser as in claim 1, wherein said specific distance between said laser crystal and said outputcoupling mirror is between 0 and 50 mm.
4. The laser as in claim 1, wherein said laser crystal can be selected from the following material: Nd:YVO4, Nd:YAB, and Nd:YSAG.
5. The butt-coupling pumped single-mode solid-state laser with fiber-coupled diodes substantially as hereinbefore described with reference to Figure 1 of the accompanying drawings.
6. A butt-coupling diode-pumped single mode solidstate laser with fiber-coupled diodes comprising:
a fiber-coupled laser diode for producing end pumping light; and
a flat-flat resonant optical cavity including a laser crystal and a frequency-doubling crystal disposed away from said laser crystal by a specific distance;
wherein the output facet of said fiber-coupled laser diode is closely spaced to said laser crystal with a distance of less than a specific length, the input facet and output facet of said laser crystal are covered with a highly reflective coating and an antireflective coating respectively, and the output facet and input facet of said frequency-doubling crystal are covered with a bi-chromatic coating and an antireflection coating respectively, and the pumping light is directed into said laser crystal and a laser output emanates from said output-coupling mirror.
7. The laser as in claim 6, wherein said specific length between the output facet of said fiber-coupled laser diode and said laser crystal must be less than 1 mm.
8. The laser as in claim 6, wherein said specific distance between said laser crystal and said outputcoupling mirror is between 0 and 50 mm.
9. The laser as in claim 6, wherein the bi-chromatic coating over the output facet of said frequencydoubling crystal can reflect the light at the fundamental wavelength back to said resonant optic cavity, and the light at the second harmonic wavelength can pass through said bi-chromatic coating, and the anti-reflection coating over the input facet of said frequency-doubling is for the light at both the fundamental wavelength and second harmonic wavelength.
10. The laser as in claim 6, wherein the highly reflective coating over the input facet of said laser crystal can reflect the light at the fundamental wavelength and second harmonic wavelength, and the anti-reflection coating over the output facet of said laser crystal is for the light at the fundamental wavelength.
11. The laser as in claim 6, wherein said laser crystal can be selected from the following material:
Nd:YVO4, Nd:YAB, and Nd:YSAG.
12. The butt-coupling pumped single-mode solid-state laser with fiber-coupled diodes substantially as hereinbefore described with reference to Figure 3 of the accompanying drawings.
13. A butt-coupling pumped single-mode solid-state laser with fiber-coupled diodes comprising:
a fiber-coupled laser diode for producing end pumping light; and
a flat-flat resonant optical cavity including a laser crystal the input and output facets of which are coated with a highly reflective coating and a partially reflective coating respectively;
wherein the output facet of said fiber-coupled laser diode is closely spaced to said laser crystal with a distance of less than a specific length, and the pumping light is directed into said laser crystal and a laser output emanates from said laser crystal.
14. The laser as in claim 13, wherein said specific length between the output facet of said fiber-coupled laser diode and said laser crystal must be less than 1 mm.
15. The laser as in claim 13, wherein said laser crystal can be selected from the following material:
Nd:YVO4, Nd:YAB, and Nd:YSAG.
16. The butt-coupling pumped single-mode solid-state laser with fiber-coupled diodes substantially as hereinbefore described with reference to Figure 2 of the accompanying drawings.
17. Solid state laser apparatus comprising a laser diode delivering end-pumping light via an optical fibre to a laser crystal positioned within a flat-flat resonant optical cavity defined by first and second plane surfaces, the first surface being a highly reflective surface of the laser crystal and the second surface being a partially reflecting surface.
18. A laser apparatus according to claim 17 wherein the second surface transmits light of the fundamental wavelength and second harmonic wavelength of the laser.
19. A laser apparatus according to claim 18 wherein a third plane surface is positioned parallel to the second surface and outside the resonant optical cavity, the third surface being reflective to light of the fundamental wavelength of the laser, but transmitting light of the second harmonic wavelength.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9708499A GB2324645A (en) | 1997-04-25 | 1997-04-25 | Single-mode solid-state diode-pumped lasers |
| DE29708086U DE29708086U1 (en) | 1997-04-25 | 1997-05-05 | Single-mode solid-state lasers with butt-coupled fiber-coupled diodes |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9708499A GB2324645A (en) | 1997-04-25 | 1997-04-25 | Single-mode solid-state diode-pumped lasers |
| DE29708086U DE29708086U1 (en) | 1997-04-25 | 1997-05-05 | Single-mode solid-state lasers with butt-coupled fiber-coupled diodes |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9708499D0 GB9708499D0 (en) | 1997-06-18 |
| GB2324645A true GB2324645A (en) | 1998-10-28 |
Family
ID=26060289
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9708499A Withdrawn GB2324645A (en) | 1997-04-25 | 1997-04-25 | Single-mode solid-state diode-pumped lasers |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE29708086U1 (en) |
| GB (1) | GB2324645A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2826192A1 (en) * | 2001-06-18 | 2002-12-20 | Univ Lille Sciences Tech | Frequency stabilized solid state laser includes window of transparent and thermally conductive material to cool optically pumped material |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4763975A (en) * | 1987-04-28 | 1988-08-16 | Spectra Diode Laboratories, Inc. | Optical system with bright light output |
| GB2252867A (en) * | 1991-01-07 | 1992-08-19 | Amoco Corp | Self-doubling laser. |
| WO1993021670A1 (en) * | 1992-04-17 | 1993-10-28 | Italtel Societa` Italiana Telecomunicazioni S.P.A. | Laser device |
| WO1994015385A1 (en) * | 1992-12-18 | 1994-07-07 | Italtel Societa' Italiana Telecomunicazioni S.P.A. | Multi-mode laser device |
| GB2288906A (en) * | 1994-04-30 | 1995-11-01 | Zeiss Carl | Axially pumped laser incorporating target visible laser beam |
| WO1996008061A1 (en) * | 1994-09-02 | 1996-03-14 | Light Solutions Corporation | Passively stabilized intracavity doubling laser |
-
1997
- 1997-04-25 GB GB9708499A patent/GB2324645A/en not_active Withdrawn
- 1997-05-05 DE DE29708086U patent/DE29708086U1/en not_active Expired - Lifetime
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4763975A (en) * | 1987-04-28 | 1988-08-16 | Spectra Diode Laboratories, Inc. | Optical system with bright light output |
| GB2252867A (en) * | 1991-01-07 | 1992-08-19 | Amoco Corp | Self-doubling laser. |
| WO1993021670A1 (en) * | 1992-04-17 | 1993-10-28 | Italtel Societa` Italiana Telecomunicazioni S.P.A. | Laser device |
| WO1994015385A1 (en) * | 1992-12-18 | 1994-07-07 | Italtel Societa' Italiana Telecomunicazioni S.P.A. | Multi-mode laser device |
| GB2288906A (en) * | 1994-04-30 | 1995-11-01 | Zeiss Carl | Axially pumped laser incorporating target visible laser beam |
| WO1996008061A1 (en) * | 1994-09-02 | 1996-03-14 | Light Solutions Corporation | Passively stabilized intracavity doubling laser |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2826192A1 (en) * | 2001-06-18 | 2002-12-20 | Univ Lille Sciences Tech | Frequency stabilized solid state laser includes window of transparent and thermally conductive material to cool optically pumped material |
| WO2002103862A1 (en) * | 2001-06-18 | 2002-12-27 | Universite Des Sciences Et Technologies De Lille | Frequency-stabilised solid-state laser oscillator |
Also Published As
| Publication number | Publication date |
|---|---|
| DE29708086U1 (en) | 1997-07-03 |
| GB9708499D0 (en) | 1997-06-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |