CN106972342B - Frequency multiplication crystal dustproof construction and ultraviolet laser - Google Patents
Frequency multiplication crystal dustproof construction and ultraviolet laser Download PDFInfo
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- CN106972342B CN106972342B CN201710108831.4A CN201710108831A CN106972342B CN 106972342 B CN106972342 B CN 106972342B CN 201710108831 A CN201710108831 A CN 201710108831A CN 106972342 B CN106972342 B CN 106972342B
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- dust
- magnet
- frequency doubling
- doubling crystal
- laser
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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
- H01S3/02—Constructional details
- H01S3/025—Constructional details of solid state lasers, e.g. housings or mountings
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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
- H01S3/10—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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- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Lasers (AREA)
Abstract
The invention discloses a frequency doubling crystal dustproof structure and an ultraviolet laser, and relates to the field of ultraviolet lasers, wherein the frequency doubling crystal dustproof structure comprises: the dust guide part and the dust outflow part are provided with dust guide channels therebetween, the dust guide part is a plurality of magnets which can generate parallel magnetic fields and are oppositely arranged, one end of each magnet is arc-shaped, one end of each dust outflow part is concave arc-shaped, and the concave arc-shaped of each dust outflow part and the arc-shaped of each magnet are opposite to form the dust guide channels. By adopting the technical scheme, as the frequency doubling crystal dustproof structure is arranged in the laser, dust particles can move towards the magnetic pole direction under the drive of the parallel magnetic field through the arrangement of the parallel magnetic field and the flow guide structure, and the laser is discharged through the flow guide structure, so that the dust particles cannot collide and adhere to the optical device, the stability of the optical device is ensured, and the service life is prolonged.
Description
Technical Field
The invention relates to the field of ultraviolet lasers, in particular to a frequency doubling crystal dustproof structure and an ultraviolet laser.
Background
In the laser cavity, because some parts of the laser can age with time and radiation to generate some dust particles, the dust particles are suspended in the cavity, such as a circuit board in the cavity, a drying agent, glue volatile matters and the like, dust particles are easy to generate, when the laser is not lightened at ordinary times, the dust particles only do disordered diffusion movement, the dust particles have small diameters and are difficult to absorb on a laser optical element due to small relative concentration, the damage is relatively small, once the laser emits light, the dust particles are immediately magnetized under the action of an electric field and a magnetic field formed by laser, the original dust particles become polarized particles similar to small magnets, attractive or repulsive acting force is generated between the original dust particles, finally, the formed larger particle groups are mutually held together to form larger particles, and the whole formed larger particle groups flow along with the direction of a light beam under the action of a high-phase beam electromagnetic field and finally strike on a light passing spot of the optical element, and the light passing surface is increased in energy absorption through the normal-phase accumulation, so that a film layer or the optical element is finally burnt.
Disclosure of Invention
The invention aims to solve the technical problems of the prior art that dust particles cause damage to optical elements.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a frequency doubling crystal dust-proof structure, comprising: the dust guide part is provided with a dust guide channel between the dust guide part and the dust outflow part, the dust guide part is provided with a plurality of magnets which can generate parallel magnetic fields and are oppositely arranged, one end of each magnet is provided with a circular arc shape, one end of each dust outflow part is provided with a concave arc shape, and the concave arc shape of each dust outflow part and the circular arc shape of each magnet are opposite to each other to form the dust guide channel.
Wherein the magnet comprises one of a permanent magnet and an electromagnet.
Specifically, the electromagnet is provided with an uninterruptible power supply.
Wherein the number of the magnets is at least two.
Specifically, the magnets comprise an upper magnet and a lower magnet, and the N pole of the upper magnet is opposite to the S pole of the lower magnet.
The dust outflow part is of a hollow annular structure, one end face of the annular structure is a horizontal plane, and the other end face of the annular structure is a circular arc concave face.
Wherein a dust reservoir for storing the outflow dust is provided on the dust outflow portion.
Specifically, the dust reservoir is detachably and movably connected with the dust outflow part.
Specifically, the dust reservoir is an electromagnetic adsorption dust reservoir.
An ultraviolet laser is provided with the frequency doubling crystal dustproof structure in front of the frequency doubling crystal.
By adopting the technical scheme, as the frequency doubling crystal dustproof structure is arranged in the laser, dust particles can move towards the magnetic pole direction under the drive of the parallel magnetic field through the arrangement of the parallel magnetic field and the flow guide structure, and the laser is discharged through the flow guide structure, so that the dust particles cannot collide and adhere to the optical device, the stability of the optical device is ensured, and the service life is prolonged.
Drawings
FIG. 1 is a schematic diagram of a frequency doubling crystal dustproof structure according to the present invention;
FIG. 2 is a side view of FIG. 1; and
fig. 3 is a schematic structural diagram of the ultraviolet laser of the present invention.
In the figure, a 1-dust guiding part, a 101-upper magnet, a 102-lower magnet, a 2-dust outflow part, a 3-dust guiding channel, a 4-first total reflecting mirror, a 5-acousto-optic laser Q-switch, a 6-fundamental frequency light generator, a 7-Brewster polarizer, an 8-second total reflecting mirror, a 9-frequency tripler crystal, a 10-walk-off angle compensating crystal, a 11-frequency doubler crystal, a 12-third total reflecting mirror, 13-fundamental frequency light, 14-ultraviolet laser and 15-green laser.
Detailed Description
The following describes the embodiments of the present invention further with reference to the drawings. The description of these embodiments is provided to assist understanding of the present invention, but is not intended to limit the present invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
As a first embodiment of the present invention, a frequency doubling crystal dust-proof structure is proposed, as shown in fig. 1, comprising: the dust guiding part 1 and the dust outflow part 2 are shown in fig. 1 and 2, the dust guiding part 1 is two magnets which are oppositely arranged, the magnets in the embodiment adopt permanent magnets, the permanent magnets comprise an upper magnet 101 and a lower magnet 102, the upper magnet and the lower magnet are of semicircular arc structures, the upper magnet and the lower magnet are conveniently arranged in an ultraviolet laser, the N pole of the lower end face of the upper magnet 101 is opposite to the S pole of the upper end face of the lower magnet 102, the N pole of the upper end face of the lower magnet 102 is opposite to the S pole of the lower end face of the upper magnet 101, a parallel magnetic field in the vertical direction is generated between the upper magnet 101 and the lower magnet 102, and after dust particles in a laser cavity are polarized, the parallel magnetic field in the vertical direction moves to magnetic poles, so that the dust particles are far away from a light beam and an optical element.
As shown in fig. 1 and 2, the dust outflow part 2 has a circular ring structure, the diameter of the middle through hole is larger than the diameter of the light beam, one end surface of the dust outflow part 2 is a horizontal end surface, the other end surface is a concave circular arc shape, one ends of the upper magnet 101 and the lower magnet 102, which are close to the dust outflow part 2, are arranged in a convex circular arc shape, the concave circular arcs of the upper magnet 101 and the lower magnet 102 are opposite to the convex circular arc shape of the dust outflow part 2, a dust guide channel 3 is arranged between the concave circular arcs of the upper magnet 101 and the lower magnet 102 and the convex circular arc shape of the dust outflow part 2, and magnetically polarized dust particles enter the dust guide channel 3 along the upper magnet 101 or the lower magnet 102 and are discharged out of the cavity of the laser through the dust guide channel 3.
Through the setting of parallel magnetic field and water conservancy diversion structure for dust particle can be under the drive of parallel magnetic field, to the magnetic pole direction motion, and discharge laser instrument through water conservancy diversion structure, do not let dust particle striking, attach on optical device, guaranteed optical device's stability, increase of service life.
As a second embodiment of the present invention, another frequency doubling crystal dust-proof structure is proposed, in which, on the basis of the first embodiment, an electromagnet is used as the dust guide 1 to attract dust particles and ensure the durability of dust attraction, and an uninterruptible power supply is connected to the electromagnet, which can be charged at the same time when the laser is started.
Meanwhile, a dust reservoir (not shown in the figure) is arranged outside the dust outflow part, the dust reservoir can store discharged dust particles, dust is not caused to be raised, the dust reservoir and the dust outflow part are detachably and movably connected, in the embodiment, the dust reservoir is an electromagnetic adsorption dust reservoir, namely, a small electromagnet (not shown in the figure) is additionally arranged in the dust reservoir, so that the dust particles cannot enter the laser cavity again from the dust outflow opening, and a person skilled in the art can know that an adsorption material such as activated carbon and the like can be arranged in the dust reservoir. Instead of the small electromagnet in this embodiment.
As a third embodiment of the present invention, an ultraviolet laser is proposed, which includes, as shown in fig. 3, a folded cavity composed of 3 total reflection mirrors, wherein a first total reflection mirror 4 and a third total reflection mirror 12 are disposed on the same side of a second total reflection mirror 8, and an included angle exists between the first total reflection mirror 4 and the second total reflection mirror 8, and an included angle also exists between the third total reflection mirror 12 and the second total reflection mirror 8; an acousto-optic laser Q-switch 5 is sequentially arranged on an axis between the first total reflecting mirror 4 and the second total reflecting mirror 8; a fundamental frequency light generator 6 and a Brewster polarizer 7 composed of a side-pumped slab module and Nd3+ YAG crystals arranged in the side-pumped slab module, wherein the side-pumped slab module adopts a diode laser pumping slab module which can output laser with the wavelength of 808Nm and the output power range comprises 1-25W, and the generated 808Nm laser can form fundamental frequency light 13 with the wavelength of 1064Nm after being injected into the Nd3+ YAG crystals; as shown in fig. 3, the acousto-optic laser Q-switch 5 is arranged between the first total reflecting mirror 4 and the nd3+ YAG crystal, and the fundamental frequency light 13 generated by the side pumping slat module is injected into the first total reflecting mirror 4 through the acousto-optic laser Q-switch 5, so that the switching effect of the acousto-optic laser Q-switch 5 is better; those skilled in the art will appreciate that the electro-optic laser Q-switch 2 may also be used for the laser Q-switch 2, depending on the application of the laser Q-switch 2. The fundamental frequency light 13 reflected by the first total reflection mirror 4 passes through the brewster polarizer 7, so that the polarization direction of the fundamental frequency light 13 is kept consistent, and the brewster law is utilized, so that the frequency doubling effect is better.
As further shown in fig. 3, the fundamental frequency light 13 after polarization is reflected by the second total reflection mirror 8 into a rear-stage optical path, which refers to an optical path between the second total reflection mirror 8 and the third total reflection mirror 12, wherein the frequency doubling crystal 11, the walk-off angle compensating crystal 10, and the frequency tripler crystal 6 are disposed between the second total reflection mirror 8 and the third total reflection mirror 12, the frequency tripler crystal 6 composed of lithium triborate (LBO) is disposed on one side close to the second total reflection mirror 8, and an end face thereof close to the second total reflection mirror 8 is cut into an output structure of brewster angle, so that the fundamental frequency light 13 is converted into frequency doubling light (i.e., green laser 15 in fig. 3), frequency tripler light (ultraviolet laser 14 in fig. 3), and the fundamental frequency light 13 at brewster angle of the frequency tripler crystal 6 after being reflected by the third total reflection mirror 12. The frequency doubling crystal 11 is also made of lithium triborate (LBO), and is disposed at one end near the third total reflection mirror 12, so that the proportion of frequency doubling light required for synthesizing the frequency doubling light is increased after the fundamental frequency light 13 passes through the frequency doubling crystal 11 twice, and the conversion efficiency of the frequency doubling light is improved. The walk-off angle compensation crystal 10 is disposed on the optical path between the frequency tripling crystal 6 and the frequency doubling crystal 11, and the walk-off angle compensation crystal 10 is rotated to change the discrete interval thereof to the return frequency doubling light, thereby compensating the discrete effect of the return frequency doubling light in the frequency doubling crystal 11 to increase the sum frequency efficiency.
As further shown in fig. 3, the frequency doubling crystal dust-proof structure as described in the first embodiment or the second embodiment is provided between the frequency doubling crystal 9 and the second total reflection mirror 8.
Through the setting of parallel magnetic field and water conservancy diversion structure for dust particle can be under the drive of parallel magnetic field, to the magnetic pole direction motion, and discharge laser instrument through water conservancy diversion structure, do not let dust particle striking, attach on optical device, guaranteed optical device's stability, increase of service life.
The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, and yet fall within the scope of the invention.
Claims (7)
1. A frequency doubling crystal dust-proof structure, comprising: the dust guide part is a plurality of magnets which can generate parallel magnetic fields and are oppositely arranged, each magnet comprises an upper magnet and a lower magnet, and the N pole of the upper magnet is opposite to the S pole of the lower magnet; the dust outflow portion is the ring structure, and the through-hole diameter in the middle is greater than the diameter of light beam, and one terminal surface of dust outflow portion is the horizontal terminal surface, and another terminal surface is concave arc, and the one end that goes up the magnet and is close to dust outflow portion with lower magnet sets up to convex arc, goes up the convex arc of magnet and lower magnet and the concave arc of dust outflow portion relatively, forms between the convex arc of last magnet and lower magnet and the concave arc of dust outflow portion the dust water conservancy diversion passageway.
2. The frequency doubling crystal dust preventing structure according to claim 1, wherein: the magnet includes one of a permanent magnet and an electromagnet.
3. The frequency doubling crystal dust preventing structure according to claim 2, wherein: and the electromagnet is provided with an uninterruptible power supply.
4. The frequency doubling crystal dust preventing structure according to claim 1, wherein: a dust reservoir for storing the outflow dust is provided on the dust outflow portion.
5. The frequency doubling crystal dust preventing structure according to claim 4, wherein: the dust reservoir is detachably and movably connected with the dust outflow part.
6. The frequency doubling crystal dust preventing structure according to claim 4, wherein: the dust reservoir is an electromagnetic adsorption dust reservoir.
7. An ultraviolet laser, characterized in that: the frequency doubling crystal dustproof structure of one of claims 1 to 6 is arranged in front of the frequency doubling crystal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710108831.4A CN106972342B (en) | 2017-02-27 | 2017-02-27 | Frequency multiplication crystal dustproof construction and ultraviolet laser |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710108831.4A CN106972342B (en) | 2017-02-27 | 2017-02-27 | Frequency multiplication crystal dustproof construction and ultraviolet laser |
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| Publication Number | Publication Date |
|---|---|
| CN106972342A CN106972342A (en) | 2017-07-21 |
| CN106972342B true CN106972342B (en) | 2023-06-02 |
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| CN201710108831.4A Active CN106972342B (en) | 2017-02-27 | 2017-02-27 | Frequency multiplication crystal dustproof construction and ultraviolet laser |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01225384A (en) * | 1988-03-04 | 1989-09-08 | Mitsubishi Electric Corp | Laser device window mechanism |
| JPH02288384A (en) * | 1989-04-28 | 1990-11-28 | Matsushita Electric Ind Co Ltd | Gas laser oscillator |
| JPH02299278A (en) * | 1989-05-15 | 1990-12-11 | Matsushita Electric Ind Co Ltd | Gas laser oscillation device |
| JPH0621545A (en) * | 1992-07-06 | 1994-01-28 | Toshiba Corp | Gas laser equipment |
| JPH06326378A (en) * | 1993-05-13 | 1994-11-25 | Sumitomo Heavy Ind Ltd | Laser dust removing device |
| JP2001255748A (en) * | 2000-03-10 | 2001-09-21 | Ricoh Co Ltd | Transfer device and image forming device |
| JP2005009596A (en) * | 2003-06-19 | 2005-01-13 | Fuji Xerox Co Ltd | Gear, gear mechanism and image forming device |
| CN206931832U (en) * | 2017-02-27 | 2018-01-26 | 福州紫凤光电科技有限公司 | A kind of frequency-doubling crystal dustproof construction and ultraviolet laser |
-
2017
- 2017-02-27 CN CN201710108831.4A patent/CN106972342B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01225384A (en) * | 1988-03-04 | 1989-09-08 | Mitsubishi Electric Corp | Laser device window mechanism |
| JPH02288384A (en) * | 1989-04-28 | 1990-11-28 | Matsushita Electric Ind Co Ltd | Gas laser oscillator |
| JPH02299278A (en) * | 1989-05-15 | 1990-12-11 | Matsushita Electric Ind Co Ltd | Gas laser oscillation device |
| JPH0621545A (en) * | 1992-07-06 | 1994-01-28 | Toshiba Corp | Gas laser equipment |
| JPH06326378A (en) * | 1993-05-13 | 1994-11-25 | Sumitomo Heavy Ind Ltd | Laser dust removing device |
| JP2001255748A (en) * | 2000-03-10 | 2001-09-21 | Ricoh Co Ltd | Transfer device and image forming device |
| JP2005009596A (en) * | 2003-06-19 | 2005-01-13 | Fuji Xerox Co Ltd | Gear, gear mechanism and image forming device |
| CN206931832U (en) * | 2017-02-27 | 2018-01-26 | 福州紫凤光电科技有限公司 | A kind of frequency-doubling crystal dustproof construction and ultraviolet laser |
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| CN106972342A (en) | 2017-07-21 |
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