GB2244851A - Conical mirror laser resonator - Google Patents
Conical mirror laser resonator Download PDFInfo
- Publication number
- GB2244851A GB2244851A GB8828115A GB8828115A GB2244851A GB 2244851 A GB2244851 A GB 2244851A GB 8828115 A GB8828115 A GB 8828115A GB 8828115 A GB8828115 A GB 8828115A GB 2244851 A GB2244851 A GB 2244851A
- Authority
- GB
- United Kingdom
- Prior art keywords
- conical
- resonator
- laser resonator
- conical mirror
- mirror
- 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.)
- Withdrawn
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
- H01S3/08—Construction or shape of optical resonators or components thereof
- H01S3/08059—Constructional details of the reflector, e.g. shape
-
- 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
- H01S3/2316—Cascaded amplifiers
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Lasers (AREA)
Abstract
A laser resonator has a conical mirror with a nominal inclusive angle of 90 degrees. Two conical mirrors may be used, one as the end reflector and the other as the output coupler. The conical resonator may be used in an oscillator/amplifier system (Fig 2). A circularly polarised beam is produced as required for multi-directional processing (eg cutting/drilling). <IMAGE>
Description
CONICAL MIRROR RESONATOR
DESCRIPTION
The invention is concerned with a laser resonator configuration having a conical mirror end reflector. The nominal inclusive angle of the mirror cone is ninety degrees as shown in
Figure 1. The resonator will be referred to as the conical resonator.
The purpose of the invention is to improve certain qualities of the laser beam in order to obtain an advantageous effect related to processing of materials.
It is known that the state of polarisation of the laser beam is of relevance to cutting, scribing and drilling. A laser beam produced from a folded cavity will be plane polarised because of the enhanced 'S' reflectance. As a result optimum processing can only be carried out in a certain direction. Consistent multi-directional processing requires a circularly polarised beam which is achieved using an additional optical element. A plane polarised beam when used for drilling produces a distorted hole shape rather than the circular hole that is required. The state of polarisation of a laser beam produced by a straight-spherical or plane-parallel resonator will be random. As a result consistent results are not obtained in processing materials.
The laser beam produced by the conical resonator has produced results in cutting and drilling to indicate that at a given time, the beam is equally polarised in all directions.
Compared to straight and folded resonators with plane or hemispherical mirrors, cutting at faster speeds in a non-directional manner is possible using the beam from the conical resonator. Further, holes drilled using the conical resonator beam are circular compared to distorted shapes produced by the plane polarised beams.
A further aspect is that the conical resonator is less sensitive to mirror misalignment compared to non-confocal straight and folded resonators with plane or hemispherical mirrors. From geometrical optics, it can be shown that the deviation of a ray after two reflections from two mirrors inclined to each other at an angle 'a' is independent of the angle of incidence and is given by 2 (it - a ) if the plane of incidence is perpendicular to the line of inter-section of the two mirrors. This is also valid for the conical mirror; therefore, the conical resonator will be less sensitive to mirror misalignment because the mode axis is not displaced.
A another observed aspect is the 'doughnut' structure and the good symmetry of the intensity distribution of the beam from the conical resonator. The 'doughnut' structure is particularly useful in surface modification processes because the less centralised intensity of the beam. Ray reversal has the result that mode quality of the conical resonator is less susceptible to degradation by optical and gain inhomogeneities of the medium.
The power produced by the conical resonator is comparable to the power produced by a straight resonator with a hemispherical mirror, under the same conditions.
A further embodiment of the conical mirror resonator is shown in Figure 2.
Claims (5)
- ClaimsConical Mirror Resonator 1. A laser resonator configuration having conical mirrors with a nominal inclusive angle of 90 degrees as its reflectors.
- 2. A laser resonator, according to claim 1, in which the conical mirror is the end reflector.
- 3. A laser resonator, according to claim 1, in which the conical mirror is the partially reflecting output coupler.
- 4. A laser resonator, according to claim 1, in which the conical mirrors are the output coupler and the end reflector.
- 5. A laser resonator, according to any one of claims 1 to 4, which is an oscillator in an oscillator/amplifier system.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8828115A GB2244851A (en) | 1988-12-02 | 1988-12-02 | Conical mirror laser resonator |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8828115A GB2244851A (en) | 1988-12-02 | 1988-12-02 | Conical mirror laser resonator |
Publications (2)
Publication Number | Publication Date |
---|---|
GB8828115D0 GB8828115D0 (en) | 1989-01-05 |
GB2244851A true GB2244851A (en) | 1991-12-11 |
Family
ID=10647822
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB8828115A Withdrawn GB2244851A (en) | 1988-12-02 | 1988-12-02 | Conical mirror laser resonator |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB2244851A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0911922A1 (en) * | 1997-10-24 | 1999-04-28 | TRUMPF LASERTECHNIK GmbH | Laser resonator |
EP1233483A1 (en) * | 2001-02-19 | 2002-08-21 | VDM Laser Optics | Method and device for generating an optical invariant field |
US7786406B2 (en) * | 2002-11-22 | 2010-08-31 | Boston Scientific Scimed, Inc. | Laser stent cutting |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB985204A (en) * | 1960-10-07 | 1965-03-03 | Western Electric Co | Improvements in or relating to optical or infrared maser cavities |
US3283262A (en) * | 1963-05-01 | 1966-11-01 | Bell Telephone Labor Inc | Optical maser operating in the tmon mode |
US3628178A (en) * | 1968-08-14 | 1971-12-14 | United Aircraft Corp | Diffractive coupling laser mirror |
US3660779A (en) * | 1970-01-02 | 1972-05-02 | American Optical Corp | Athermalization of laser rods |
US4514850A (en) * | 1983-05-16 | 1985-04-30 | Rockwell International Corporation | Common-pass decentered annular ring resonator |
US4516244A (en) * | 1983-09-01 | 1985-05-07 | Rockwell International Corporation | Common-pass decentered annular ring resonator with improved polarization control |
US4731794A (en) * | 1985-06-03 | 1988-03-15 | Max-Planck-Gesellschaft Zur Forderung Der Wissenschaften E.V. | Optical laser pumping system |
-
1988
- 1988-12-02 GB GB8828115A patent/GB2244851A/en not_active Withdrawn
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB985204A (en) * | 1960-10-07 | 1965-03-03 | Western Electric Co | Improvements in or relating to optical or infrared maser cavities |
US3283262A (en) * | 1963-05-01 | 1966-11-01 | Bell Telephone Labor Inc | Optical maser operating in the tmon mode |
US3628178A (en) * | 1968-08-14 | 1971-12-14 | United Aircraft Corp | Diffractive coupling laser mirror |
US3660779A (en) * | 1970-01-02 | 1972-05-02 | American Optical Corp | Athermalization of laser rods |
US4514850A (en) * | 1983-05-16 | 1985-04-30 | Rockwell International Corporation | Common-pass decentered annular ring resonator |
US4516244A (en) * | 1983-09-01 | 1985-05-07 | Rockwell International Corporation | Common-pass decentered annular ring resonator with improved polarization control |
US4731794A (en) * | 1985-06-03 | 1988-03-15 | Max-Planck-Gesellschaft Zur Forderung Der Wissenschaften E.V. | Optical laser pumping system |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0911922A1 (en) * | 1997-10-24 | 1999-04-28 | TRUMPF LASERTECHNIK GmbH | Laser resonator |
EP1233483A1 (en) * | 2001-02-19 | 2002-08-21 | VDM Laser Optics | Method and device for generating an optical invariant field |
US7786406B2 (en) * | 2002-11-22 | 2010-08-31 | Boston Scientific Scimed, Inc. | Laser stent cutting |
Also Published As
Publication number | Publication date |
---|---|
GB8828115D0 (en) | 1989-01-05 |
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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) |