CN104319608A - Resonant cavity structure used for generating radially polarized laser - Google Patents
Resonant cavity structure used for generating radially polarized laser Download PDFInfo
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- CN104319608A CN104319608A CN201410489944.XA CN201410489944A CN104319608A CN 104319608 A CN104319608 A CN 104319608A CN 201410489944 A CN201410489944 A CN 201410489944A CN 104319608 A CN104319608 A CN 104319608A
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Abstract
The invention belongs to the technical field of laser and optics, and specifically relates to a resonant cavity structure used for generating radially polarized laser. The resonant cavity structure comprises a rear mirror, a first equivalent 1/2 wave plate, a second equivalent 1/2 wave plate, a window mirror, and three gain regions. The three gain regions are connected in series by space folding through the first equivalent 1/2 wave plate and the second equivalent 1/2 wave plate to form a complete resonant cavity optical path. The rear mirror and the window mirror are respectively disposed at the head and tail ends of the resonant cavity optical path. The optical axes of the resonant cavity optical paths of the three gain regions are parallel. The included angle between the optical axis of the first equivalent 1/2 wave plate and the optical axis of the second equivalent 1/2 wave plate is 45 degrees. The initial polarization state of a light beam in the cavity is determined as angular polarization through the rear mirror, and then the multiple gain regions are connected in series by a polarizer, thereby obtaining the output of radially polarized laser directly. The resonant cavity has no external conversion optical device, and is simple in structure and easy to realize.
Description
Technical field
The invention belongs to laser and optical technical field, be specifically related to a kind of cavity resonator structure for generation of radial polarisation laser.
Background technology
Recently, along with the development of the technology such as holographic, relevant, spectrum, photochemistry and accelerator, the axially symmetry polarization laser demand as radial polarisation laser special to some is increasing.In addition, in laser processing, especially in Laser cutting, for ensureing the uniformity consistency of linear polarization (S-polarization or P-polarization) laser crudy on different machine direction, usually go again to process after linearly polarized laser need being walked around into circularly polarized laser, but the method more complicated, seek one for this reason and both there is no directional selectivity, there is again the lasing light emitter of the material absorptivity higher than circularly polarized laser, be exactly the target that laser processing industrial circle is pursued, and radial polarisation laser have the lasing light emitter of such characteristic just.
Two kinds are had at present for the method directly producing axial symmetry radial polarisation Laser output:
One is by introducing the optical element with polarization selectivity characteristic in the resonant cavity of laser, as adopted the grating mirror with radial polarisation selectivity characteristic as the tail mirror of laser, directly produces radial polarisation Laser output.But grating mirror complex structure, comparison difficulty, and under high power work condition its useful life be also difficult to be guaranteed.
Two is first obtain linearly polarized laser or the output of angle polarization laser, then adopts optical system outside chamber to carry out the conversion of polarization state, thus obtains radial polarisation laser.To usual the produced linearly polarized laser of laser, adopt outside chamber and revolve wave plate optical element, change linearly polarized light beam into radial polarized light beam, but very complicated as revolving optical element structure special wave plate, and its making is also very difficult.
Summary of the invention
Object of the present invention be exactly in order to solve above-mentioned background technology exist deficiency, provide a kind of structure more simple and be easy to realization the cavity resonator structure for generation of radial polarisation laser.
The technical solution used in the present invention is: a kind of cavity resonator structure for generation of radial polarisation laser, comprise tail mirror, the first equivalent 1/2 wave plate, the second equivalent 1/2 wave plate, window mirror and three sections of gain regions, described three sections of gain regions are respectively the first gain region, the second gain region and the 3rd gain region; The head end optical axis of the tail end optical axis of the first place, gain region resonant cavity light path and the second place, gain region resonant cavity light path is serially connected by described first equivalent 1/2 wave plate; The head end optical axis of the tail end optical axis of the second place, gain region resonant cavity light path and the 3rd place, gain region resonant cavity light path is serially connected by described second equivalent 1/2 wave plate, forms complete resonant cavity light path; Described tail mirror and window mirror lay respectively at the head and the tail two ends of resonant cavity light path, and the optical axis of place, described three sections of gain regions resonant cavity light path is parallel to each other, and the angle between the optical axis of the first equivalent 1/2 wave plate and the optical axis of the second equivalent 1/2 wave plate is 45 degree.
Tail mirror is used for the initial polarization state in resonant cavity to be defined as angle polarization, form by adjacent two optical axises of equivalent 1/2 wave plate serial connection the intersecting plane that two angles are 45 degree, the angle between this optical axis just meaning two equivalence 1/2 wave plates is also just 45 degree.In this case, after light beam passes through equivalence 1/2 wave plate of these two optical axises intersections 45 degree successively, the polarization direction just 90-degree rotation of this incident beam, because incident beam is angle polarization, so by just becoming radial polarisation after this conversion, the segment beam of this polarization state is after window mirror exports, and polarization direction remains unchanged, and the laser beam of output is radial polarisation laser.
Further, described tail mirror and window mirror lay respectively at the head end of the first place, gain region resonant cavity light path and the tail end of the 3rd place, gain region resonant cavity light path.
Further, described first equivalent 1/2 wave plate comprises two polariscopes with high reflectance and quarter wave plate phase-delay characteristic, two polariscopes lay respectively at the tail end of the first place, gain region resonant cavity light path and the head end of the second place, gain region resonant cavity light path, and incident beam pressed by two polariscopes and respective normal is that miter angle position is placed.
Further, described second equivalent 1/2 wave plate comprises two polariscopes with high reflectance and quarter wave plate phase-delay characteristic, two polariscopes lay respectively at the tail end of the second place, gain region resonant cavity light path and the head end of the 3rd place, gain region resonant cavity light path, and incident beam pressed by two polariscopes and respective normal is that miter angle position is placed.
Four high reflectance polariscopes with quarter wave plate phase-delay characteristic, all 45 degree of incidence angle positions are become to place by incident beam with respective normal, while realizing gain length serial connection, two one group just defines two equivalence 1/2 wave plates, and the polarization direction of the light beam by it all can be made to rotate.
Further, described tail mirror is the grating mirror matched with Output of laser wavelength.
Further, described tail mirror to be cone angle the be interior axicon lens of 90 degree.
When tail mirror has angle polarization selectivity characteristic, pass through technique scheme, just can directly obtain radial polarisation Laser output, this has very great economic worth for the speed or efficiency significantly improving Laser cutting, also for researchs such as particle accelerators, there is great scientific meaning.Because in metallic mirror or metal, axicon lens is generally higher than the reflectivity to P-polarization to the reflectivity of S-polarization, can be easy to realize angle polarization when adopting cone angle to be the inner cone tail mirror of 90 degree and select.
The initial polarization state of intracavity beam is defined as angle polarization by tail mirror by the present invention, then the polariscope with phase-delay characteristic is utilized to be connected in series multiple gain region, while realizing gain length serial connection, achieve again the rotation transformation of polarization direction, thus directly obtain the output of radial polarisation laser.This resonant cavity is without any external conversion optics, and structure is simple, is easy to realize.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 is the structural representation at another visual angle of the present invention.
Fig. 3 is end view of the present invention.
Fig. 4 is the schematic diagram of equivalence 1/2 wave plate 17 of polariscope 2 and 3 of the present invention composition.
Fig. 5 is the schematic diagram of equivalence 1/2 wave plate 18 of polariscope 4 and 5 of the present invention composition.
The structural representation of two equivalence 1/2 wave plate optical axises intersections 45 degree that Fig. 6 is formed by 4 polariscopes for the present invention.
Fig. 7 is that the optical axis of the present invention's two equivalence 1/2 wave plates intersects 45 degree of schematic diagrames carrying out axially symmetry polarization conversion.
Fig. 8 is that the optical axis of the present invention's two equivalence 1/2 wave plates intersects 45 degree of schematic diagrams carrying out the orthogonal conversion in axially symmetry polarization direction.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail, is convenient to be well understood to the present invention, but they do not form restriction to the present invention.
As shown in Figure 1, axially symmetry polarization laser resonator structure of the present invention, by having the high reflectance tail mirror 1 of axially symmetry polarization (angle polarization or radial polarisation) selectivity characteristic, the high reflectance polariscope 2,3,4,5 with quarter wave plate phase-delay characteristic and the output window mouth mirror 6 with part reflecting part transmissison characteristic and three sections of gain regions being parallel to each other form.Wherein, three sections of gain regions are respectively the first gain region 8, gain region 7, second and the 3rd gain region 9, and the optical axis of its place light path is separately respectively 10,11,12, and optical axis 10,11,12 is parallel to each other.Angle between the incident beam normal corresponding to it folded light beam with the polariscope 2,3,4,5 of high reflectance is 45 degree, and the resonant cavity light path at the first gain region 8, gain region 7, second and the 3rd place, gain region 9 is serially connected effectively forms complete resonant cavity light path, tail mirror 1 and window mirror 6 lay respectively at the head and the tail two ends of resonant cavity light path, and its respective axis respectively with the light shaft coaxle of the resonant cavity light path at its place, the position of tail mirror 1 and window mirror 6 can exchange, effect is identical, and the position and the direction that are Output of laser change.Concrete tandem is: the head end optical axis of the tail end optical axis of the first place, gain region 7 resonant cavity light path and the second place, gain region 8 resonant cavity light path is serially connected by the first equivalent 1/2 wave plate 17 that polariscope 2 and 3 forms; The head end optical axis of the tail end optical axis of the second place, gain region 8 resonant cavity light path and the 3rd place, gain region 9 resonant cavity light path is serially connected by the second equivalent 1/2 wave plate 18 that polariscope 4 and 5 forms, and forms complete resonant cavity light path; Namely polariscope 2 and 3 lays respectively at the tail end of the first place, gain region 7 resonant cavity light path and the head end of the second place, gain region 8 resonant cavity light path, polariscope 4 and 5 lays respectively at the tail end of the second place, gain region 8 resonant cavity light path and the head end of the 3rd place, gain region 9 resonant cavity light path, tail mirror 1 and window mirror 6 lay respectively at the head end of the first place, gain region 7 resonant cavity light path and the tail end of the 3rd place, gain region 9 resonant cavity light path, form the laserresonator of a many folding in space.Laser vibrates in this resonant cavity, and is amplified in the first gain region 8, gain region 7, second and the 3rd gain region 9, and then fraction of laser light is gone out by window mirror 6 transmission and formed Output of laser 13.Medium in three sections of gain regions can be various laser gain material, and the distribution of its sectional density has axial symmetry uniformity.
As shown in Figure 2, in axially symmetry polarization laser resonator structure of the present invention, tail mirror 1 is used for initial polarization state in chamber to be defined as angle polarization, the high reflectance with quarter wave plate phase-delay characteristic wilfully galvanometer 2 with 3 incident beam and folded light beam with its separately normal all become 45 degree to put together equivalent 1/2 wave plate of formation first, the polarization direction of the light beam by this wave plate can be rotated a certain angle.In like manner, the high reflectance polariscope 4 and 5 with quarter wave plate phase-delay characteristic forms the second equivalent 1/2 wave plate, also will produce same polarization direction rotate effect.Equivalence 1/2nd wave plates, except having except the polariscope composition of quarter wave plate phase-delay characteristic with two above-mentioned, can also form by multi-disc 1/8 wave plate or other wave plate combined.
As shown in Figure 2,3, in the many foldings laserresonator of " ∠ " of the present invention shape space, the plane 16 that the optical axis 11 and 12 that the plane 15 that the optical axis 10 and 11 be connected in series by polariscope 2 and 3 is formed is connected in series with by polariscope 4 and 5 is formed intersects at optical axis 11, two plane distributions in " ∠ " shape, and the angle 14 between these two planes is 45 degree.Angle between this optical axis just meaning the first equivalent 1/2 wave plate that polariscope 2 and 3 forms and the second equivalent 1/2 wave plate that polariscope 4 and 5 forms is just 45 degree.In this case, after light beam passes through equivalence 1/2 wave plate of these two optical axises intersections 45 degree successively, the polarization direction just 90-degree rotation of this incident beam, because incident beam is angle polarization, so by just becoming radial polarisation after this conversion, the segment beam of this polarization state is after window mirror 6 exports, and polarization direction remains unchanged, and the laser beam namely exported is radial polarisation characteristic.
As shown in Figure 4, there is the polariscope 2 and 3 of quarter wave plate phase-delay characteristic, when becoming 45 degree positions to place with its normal 2 ' with 3 ' by incidence angle respectively, namely constituting the first equivalent 1/2 wave plate 17 of a reflective backward.When incident beam 19 is by after this wave plate, can there is the rotation of certain angle in the polarization direction of outgoing beam 20.
In like manner, as shown in Figure 5, when incident beam 20 passes through after by the second equivalent 1/2 wave plate 18 that the polariscope 4 and 5 (its normal is respectively 4 ' and 5 ') with quarter wave plate phase-delay characteristic is formed, also will there is the rotation of certain angle in the polarization direction of outgoing beam 21.
As shown in Figure 6, the optical axis place plane 15 of the in Fig. 4 first equivalent 1/2 wave plate 17 determined by optical axis 10 and 11, and the normal 2 ' and 3 ' of polariscope 2 and 3 also drops in this plane 15.In like manner, the optical axis place plane 16 of the in Fig. 5 second equivalent 1/2 wave plate 18 determined by optical axis 11 and 12, and the normal 4 ' and 5 ' of polariscope 4 and 5 also drops in this plane 16, and the angle 14 between plane 15 and plane 16 is 45 degree.
Fig. 7 is the equivalent schematic of Fig. 6 system.After light beam 19 (its diagram polarization state is angle polarization 19 ') is by the first equivalent 1/2 wave plate 17, namely there is the rotation of certain angle in the polarization direction of corresponding outgoing beam 20.In like manner, when light beam 20 is again by after the second equivalent 1/2 wave plate 18, also can there is the rotation of certain angle in the polarization direction of corresponding outgoing beam 21.Due to the first equivalent 1/2 wave plate 17 and the second equivalent 1/2 wave plate 18 optical axis 17 ' and 18 ' between angle 14 be just 45 degree, this just means: after the first equivalent 1/2 wave plate 17 placed by such space successively when light beam 19 and the second equivalent 1/2 wave plate 18, the polarization direction of its outgoing beam 20 just have rotated 90 degree, and namely its polarization direction becomes radial polarisation 20 ' by angle polarization 18 '.In like manner analyze, the transfer process of above-mentioned polarization direction is reversible, as being reflected back the radial polarized light beam in chamber through window mirror part, again after this system, will be reduced to angle light beam again.
Fig. 8 to be two optical axis included angles be 1/2 wave plate of 45 degree carries out angle polarization and schematic diagram that radial polarisation is changed mutually.In xoy coordinate system, first select the optical axis 17 ' of the first equivalent 1/2 wave plate 17 parallel with y-axis, when the polarization direction at any point A place on incident beam cross section be angle polarization E φ and and angle between the optical axis 17 ' of the first equivalent 1/2 wave plate 17 is α time, after the first equivalent 1/2 wave plate 17, namely there is the rotation of 2 α angles and become E ' in its polarization direction, the angle between E ' and optical axis 17 ' is α.In like manner, when E ' is again by after the second equivalent 1/2 wave plate 18, the rotation of generation 2 θ angle also becomes by its polarization direction, and here, θ is the angle between the optical axis 18 ' of E ' and the second equivalent 1/2 wave plate 18; So, the angle between the optical axis 17 ' and 18 ' of the first equivalent 1/2 wave plate 17 and the second equivalent 1/2 wave plate 18 is (α+θ).Visible, incident beam is successively after the first equivalent 1/2 wave plate 17 and the second equivalent 1/2 wave plate 18, and the anglec of rotation between the polarization direction of outgoing beam and the polarization direction of incident beam is 2 (α+θ) altogether.Obviously, when angle (α+θ) between the optical axis 17 ' and 18 ' of the first equivalent 1/2 wave plate 17 and the second equivalent 1/2 wave plate 18 is chosen to be 45 degree, and between just there occurs the rotation of 90 degree, the incident beam of this i.e. angle polarization E φ becomes the outgoing beam of radial polarisation Er.In like manner, it is reciprocal that axially symmetry polarization (angle or radial direction) light beam intersects the transfer process of polarization state of equivalence 1/2 wave plates of 45 degree placements through optical axis, namely, when the initial polarization state selected when tail mirror is radial polarisation, this resonant cavity is exportable angle polarization laser also.
The content be not described in detail in this specification belongs to the known prior art of professional and technical personnel in the field.
Claims (6)
1. for generation of a cavity resonator structure for radial polarisation laser, it is characterized in that: comprise tail mirror (1), the first equivalent 1/2 wave plate, the second equivalent 1/2 wave plate, window mirror (6) and three sections of gain regions; Described three sections of gain regions are respectively the first gain region (7), the second gain region (8) and the 3rd gain region (9), and the head end optical axis of the tail end optical axis of the first gain region (7) place resonant cavity light path and the second gain region (8) place resonant cavity light path is serially connected by described first equivalent 1/2 wave plate; The head end optical axis of the tail end optical axis of the second gain region (8) place resonant cavity light path and the 3rd gain region (9) place resonant cavity light path is serially connected by described second equivalent 1/2 wave plate, forms complete resonant cavity light path; Described tail mirror and window mirror lay respectively at the head and the tail two ends of resonant cavity light path, and the optical axis of place, described three sections of gain regions resonant cavity light path is parallel to each other, and the angle between the optical axis of the first equivalent 1/2 wave plate and the optical axis of the second equivalent 1/2 wave plate is 45 degree.
2. a kind of cavity resonator structure for generation of radial polarisation laser according to claim 1, is characterized in that: described tail mirror (1) and window mirror (8) lay respectively at the head end of the first gain region (7) place resonant cavity light path and the tail end of the 3rd gain region (9) place resonant cavity light path.
3. a kind of cavity resonator structure for generation of radial polarisation laser according to claim 1, it is characterized in that: described first equivalent 1/2 wave plate comprises two polariscopes with high reflectance and quarter wave plate phase-delay characteristic, two polariscopes lay respectively at the tail end of the first place, gain region resonant cavity light path and the head end of the second place, gain region resonant cavity light path, and incident beam pressed by two polariscopes and respective normal is that miter angle position is placed.
4. a kind of cavity resonator structure for generation of radial polarisation laser according to claim 1, it is characterized in that: described second equivalent 1/2 wave plate comprises two polariscopes with high reflectance and quarter wave plate phase-delay characteristic, two polariscopes lay respectively at the tail end of the second place, gain region resonant cavity light path and the head end of the 3rd place, gain region resonant cavity light path, and incident beam pressed by two polariscopes and respective normal is that miter angle position is placed.
5., according to described a kind of cavity resonator structure for generation of radial polarisation laser arbitrary in claim 1-4, it is characterized in that: described tail mirror is the grating mirror matched with Output of laser wavelength.
6. according to described a kind of cavity resonator structure for generation of radial polarisation laser arbitrary in claim 1-4, it is characterized in that: described tail mirror to be cone angle the be interior axicon lens of 90 degree.
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| CN201410489944.XA CN104319608A (en) | 2014-09-23 | 2014-09-23 | Resonant cavity structure used for generating radially polarized laser |
| PCT/CN2014/095041 WO2016045218A1 (en) | 2014-09-23 | 2014-12-26 | Resonant cavity structure for generating radial polarized laser |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112666699A (en) * | 2020-12-31 | 2021-04-16 | 山东高等技术研究院 | Azimuth-independent polarization conversion device, experimental device and using method |
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| JP2011204943A (en) * | 2010-03-26 | 2011-10-13 | Mitsubishi Electric Corp | Laser oscillator and reflective diffraction optical element |
| CN204230621U (en) * | 2014-09-23 | 2015-03-25 | 武汉博问光电有限公司 | A kind of cavity resonator structure for generation of radial polarisation laser |
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- 2014-09-23 CN CN201410489944.XA patent/CN104319608A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2003179287A (en) * | 2001-12-10 | 2003-06-27 | Amada Eng Center Co Ltd | Three-axis orthogonal type carbon dioxide gas laser oscillator |
| US20050220164A1 (en) * | 2004-03-31 | 2005-10-06 | Fanuc Ltd | Laser oscillator |
| JP2011204943A (en) * | 2010-03-26 | 2011-10-13 | Mitsubishi Electric Corp | Laser oscillator and reflective diffraction optical element |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112666699A (en) * | 2020-12-31 | 2021-04-16 | 山东高等技术研究院 | Azimuth-independent polarization conversion device, experimental device and using method |
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