CN115693374A - Laser frequency doubling device - Google Patents
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- CN115693374A CN115693374A CN202211719493.5A CN202211719493A CN115693374A CN 115693374 A CN115693374 A CN 115693374A CN 202211719493 A CN202211719493 A CN 202211719493A CN 115693374 A CN115693374 A CN 115693374A
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- 230000003287 optical effect Effects 0.000 claims description 8
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Abstract
The invention belongs to the technical field of laser frequency doubling, and provides a laser frequency doubling device, which comprises: the device comprises a wave plate, a polarizing plate, a first frequency doubling crystal, a second frequency doubling crystal, a first dichroic mirror, a second dichroic mirror, a third dichroic mirror and a laser absorption device; the wave plate adjusts the polarization state of the input laser, and the polaroid divides the laser beam into two laser beams with different propagation directions according to the polarization states which are mutually vertical; the first laser beam outputs a second frequency doubling light beam after frequency doubling of the second frequency doubling crystal; the second laser beam is reflected to the first frequency doubling crystal light incident surface by the polaroid with the preset beam splitting angle to output a first frequency doubling light beam; the first frequency doubling light beam is reflected by the first dichroic mirror, the second dichroic mirror and the third dichroic mirror in sequence, passes through the second frequency doubling crystal and is combined with the second frequency doubling light beam for output. The technical scheme of the invention can realize high peak power fundamental frequency light frequency multiplication output and reduce the damage risk of the nonlinear crystal; and a mechanical moving mechanism is not needed, so that the failure rate is reduced, and the maintenance is simple.
Description
Technical Field
The invention belongs to the technical field of laser frequency doubling, and relates to a laser frequency doubling device.
Background
The laser frequency doubling technology is an important technology for converting laser in invisible wave bands into laser light sources in visible wave bands through frequency conversion, the frequency-doubled visible laser is widely applied to the fields of interference rainbow holography, fine laser spectrum, differential absorption laser radar, multiphoton step ionization, nonlinear conversion, laser medicine, precision machining, military and the like, and has wide application prospects in the fields of high-brightness laser color display, laser color printing and other equipment, entertainment industry and the like. At present, the conventional method for obtaining green laser is to use a laser crystal to generate laser (1064 nm fundamental frequency light) in a near-infrared band, and then use a crystal with a nonlinear effect to frequency-double the fundamental frequency light. At present, the most widely applied nonlinear crystals include LBO, BBO, KTP and the like, and the nonlinear crystals can realize frequency doubling conversion.
The frequency doubling module in the prior art mainly comprises a temperature control device and a nonlinear crystal, and when the frequency doubling module is used, the whole frequency doubling module is directly arranged on a fundamental frequency light path. In the frequency doubling mode, the input laser peak power is limited by the damage threshold of the nonlinear crystal, and the frequency doubling of the fundamental frequency light with higher peak power density cannot be performed.
The frequency doubling area is increased, the power density is reduced, the fundamental frequency light is converted through a light path, the cross-sectional area is enlarged, and the power density passing through the nonlinear crystal is reduced. This method requires the use of a large-diameter nonlinear crystal and the design of a complicated optical path conversion system, which is more costly. The technical difficulty or the cost of selecting a nonlinear crystal with a higher damage threshold or a coating technology is higher, and the nonlinear crystal or the coating technology cannot be compatible with frequency doubling efficiency.
Disclosure of Invention
In order to solve the above technical problem, a first aspect of the present invention provides a laser frequency doubling device, including: the device comprises a wave plate, a polaroid with a preset light splitting angle, a first frequency doubling crystal, a second frequency doubling crystal, a first dichroic mirror, a second dichroic mirror, a third dichroic mirror and a laser absorption device;
the polarization state of the input laser beam is adjusted by the input laser beam through the wave plate, and the polarization plate with the preset light splitting angle divides the laser beam into two laser beams with different propagation directions according to the polarization states which are mutually vertical;
the first laser beam continues to be transmitted along the original propagation direction, penetrates through the polaroid with the preset light splitting angle and the third dichroic mirror, is input into the light incident surface of the second frequency doubling crystal, and outputs a second frequency doubling light beam after frequency doubling of the second frequency doubling crystal;
the second laser beam is reflected to the light incident surface of the first frequency doubling crystal by the polaroid with the preset light splitting angle at a preset reflection angle, and is frequency-doubled by the first frequency doubling crystal to output a first frequency doubling light beam;
the first frequency doubling light beam output by the first frequency doubling crystal in a frequency doubling mode sequentially passes through the first dichroic mirror, the second dichroic mirror and the third dichroic mirror, is combined into the first laser beam after being reflected, passes through the second frequency doubling crystal and is combined with the second frequency doubling light beam for output.
In the apparatus according to the first aspect of the present invention, the first frequency doubling crystal and the second frequency doubling crystal are both configured with temperature control devices for cooling the first frequency doubling crystal and the second frequency doubling crystal.
In the device according to the first aspect of the present invention, the temperature control devices of the first frequency doubling crystal and the second frequency doubling crystal have constant temperature control.
The apparatus according to the first aspect of the present invention, wherein the wave plate is a half wave plate; the polarizing plate of the predetermined splitting angle is a polarizing plate of a 45 ° incident angle, and the polarizing plate of the 45 ° incident angle is disposed at a 45 ° incident angle with respect to an optical axis of the incident laser beam.
In the apparatus according to the first aspect of the present invention, the first dichroic mirror, the second dichroic mirror, and the third dichroic mirror are all mirrors with an incident angle of 45 °, and two mirror surfaces thereof are coated with a 45 ° incident angle frequency doubling light high reflection film and a 45 ° incident angle reflection film of an original laser beam.
According to the device of the first aspect of the present invention, laser absorption devices are respectively placed on the back surfaces of the first dichroic mirror and the second dichroic mirror within a predetermined distance along the optical axis direction, and the area of each laser absorption device is larger than that of a laser beam or a frequency doubling light beam.
A second aspect of the present invention provides a laser frequency doubling method, using the laser frequency doubling apparatus according to any one of the above embodiments, the laser frequency doubling method including the steps of:
step 3, the first laser beam penetrates through the polaroid and the third dichroic mirror and then is input into the light incident surface of the second frequency doubling crystal, and the second frequency doubling crystal doubles the frequency of the first laser beam and outputs a second frequency doubling light beam; adjusting the azimuth angle or the pitch angle of the second frequency doubling crystal to enable the frequency doubling efficiency of the second frequency doubling crystal to be highest;
step 4, the second laser beam is reflected by the polaroid and then input to the light incident surface of the first frequency doubling crystal, and the first frequency doubling crystal doubles the frequency of the second laser beam and outputs a first frequency doubling light beam; adjusting the azimuth angle or the pitch angle of a first frequency doubling crystal to enable the frequency doubling efficiency of the first frequency doubling crystal to be highest;
and 5, sequentially adjusting the azimuth angles or the pitch angles of the first dichroic mirror, the second dichroic mirror and the third dichroic mirror to combine the first frequency doubling light with the first laser beam penetrating through the polaroid.
The method according to the second aspect of the present invention, the adjustment range of the splitting ratio of the first laser beam and the second laser beam is: 0-100%, and adjusting the light splitting ratio according to actual requirements.
The method according to the second aspect of the present invention, wherein the spectral ratio of the first laser beam to the second laser beam is: 50:50.
The method according to the second aspect of the present invention, step 5 comprises: and sequentially adjusting the azimuth angles or the pitch angles of the first dichroic mirror, the second dichroic mirror and the third dichroic mirror to enable the first frequency doubling light and the second frequency doubling light to be coaxially output.
The technical scheme adopted by the invention has the following advantages: the high peak power fundamental frequency light frequency multiplication output can be realized, and the damage risk of the nonlinear crystal is reduced; and a mechanical moving mechanism is not needed, so that the failure rate is reduced, and the maintenance is simple.
Drawings
Fig. 1 is a schematic perspective view of a laser frequency doubling device according to the present invention;
fig. 2 is a diagram of an optical path structure of a laser frequency doubling device according to the present invention.
The laser device comprises a first dichroic mirror, a second dichroic mirror, a laser absorption device, a first double-phase mirror, a polarizer, a second dichroic mirror, a polarizer, a first frequency doubling crystal, a second frequency doubling crystal, a third dichroic mirror, a second frequency doubling crystal and a third dichroic mirror, wherein the polarizer has an incident angle of 2.45 degrees, the first frequency doubling crystal is 3, the first dichroic mirror is 4, the laser absorption device is 5, the second dichroic mirror is 6, the second frequency doubling crystal is 7, and the third dichroic mirror is 8.
Detailed Description
The invention designs a device capable of being used for high-power laser frequency doubling, which mainly comprises a half-wave plate, a polarizing plate, a frequency doubling crystal, a temperature control device, a dichroic mirror, a laser absorption device and the like. The half wave plate is used for adjusting the polarization state direction of the input laser; the polaroid is used for polarizing and splitting the high-power laser; the frequency doubling crystal and the temperature control device are used for converting the fundamental frequency light into frequency doubling light; the dichroic mirror is used for separating the fundamental frequency light and the frequency doubling light and adjusting the output direction of the laser; the laser absorption device is used for receiving the residual fundamental frequency light. The device can realize the frequency multiplication output of the high peak power pulse laser and reduce the damage risk of a frequency multiplication device.
The following detailed description of embodiments of the invention refers to the accompanying drawings.
A first aspect of the present invention provides a laser frequency doubling apparatus, including: the device comprises a one-half wave plate 1, a polarizer 2 with an incident angle of 45 degrees, a first frequency doubling crystal 3, a second frequency doubling crystal 7, a first dichroic mirror 4, a second dichroic mirror 6, a third dichroic mirror 8 and a laser absorption device 5;
the input laser beam passes through the half wave plate 1 to adjust the polarization state of the input laser beam, and the polarizing plate 2 with the incident angle of 45 degrees divides the laser beam into two laser beams with different propagation directions according to the polarization states which are vertical to each other;
the first laser beam continues to transmit along the original propagation direction, penetrates through the 45-degree incident angle polaroid 2 and the third dichroic mirror 6, is input into the light incident surface of the second frequency doubling crystal 7, and is frequency-doubled by the second frequency doubling crystal 7 to output a second frequency doubling light beam;
the second laser beam is reflected by the polaroid 2 with the incident angle of 45 degrees to the light incident surface of the first frequency doubling crystal 3 at a reflection angle of 90 degrees, and is frequency-doubled by the first frequency doubling crystal 3 to output a first frequency doubling light beam;
the first frequency doubling light beam output by the first frequency doubling crystal 3 in a frequency doubling mode is reflected by the first dichroic mirror 4, the second dichroic mirror 6 and the third dichroic mirror 8 in sequence, combined into the first laser beam, passes through the second frequency doubling crystal 7 and is combined with the second frequency doubling light beam for output.
The input linear polarization base frequency laser adjusts the polarization direction through the half-wave plate 1, the light splitting proportion passing through the polarization light splitting plate is adjusted, the S polarization light is split by the polarizing plate 2 with the 45-degree incidence angle and reflected to the first frequency doubling crystal 3 for frequency doubling, the P polarization light is transmitted through the polarizing plate 2 with the 45-degree incidence angle and the third dichroic mirror 8 and then frequency doubled by the second frequency doubling crystal 7, the first dichroic mirror 4 reflects and turns the frequency doubling light, the residual base frequency light is transmitted to the laser absorption device 5, the second dichroic mirror 6 turns the frequency doubling light again, and the third dichroic mirror 8 can reflect the frequency doubling light and transmit the base frequency laser light at the same time, so that two laser beams are combined again. The azimuth angles or the pitch angles of the first dichroic mirror 4, the second dichroic mirror 6, and the third dichroic mirror 8 can be adjusted so that the two light beams are coaxially output.
In the apparatus according to the first aspect of the present invention, the first frequency doubling crystal 3 and the second frequency doubling crystal 7 are both configured with temperature control devices for cooling the first frequency doubling crystal 3 and the second frequency doubling crystal 7.
According to the device of the first aspect of the present invention, the temperature control devices of the first frequency doubling crystal 3 and the second frequency doubling crystal 7 are provided with constant temperature control.
The first frequency doubling crystal 3 and the second frequency doubling crystal 7 are controlled by adopting constant temperature, the working temperature of the frequency doubling crystal is selected to be constant at a higher temperature, such as 65 ℃, through reasonably designing the cutting angle of the nonlinear crystal, the problem that a low-temperature control point needs to be cooled when the environmental temperature is high is avoided, the stability of the conversion efficiency can be ensured, and if the nonlinear crystal is not sensitive to the temperature, a temperature control device can be eliminated.
In the device according to the first aspect of the present invention, the 45 ° incident angle polarizer 2 is placed at a 45 ° incident angle with respect to the optical axis of the incident laser beam.
In the apparatus according to the first aspect of the present invention, the first dichroic mirror 4, the second dichroic mirror 6, and the third dichroic mirror 8 are all mirrors with an incident angle of 45 °, and two mirror surfaces thereof are coated with a 45 ° incident angle frequency doubling light high reflection film and a 45 ° incident angle antireflection film of an original laser beam.
According to the device of the first aspect of the present invention, laser absorption devices 5 are respectively disposed on the back surfaces of the first dichroic mirror 4 and the second dichroic mirror 6 within a predetermined distance along the optical axis direction, and the area of each laser absorption device 5 is larger than the area of a laser beam or a frequency doubling light beam.
A second aspect of the present invention provides a laser frequency doubling method, using the laser frequency doubling apparatus according to any one of the above embodiments, the laser frequency doubling method including the steps of:
step 3, the first laser beam penetrates through the polarizer 2 with the incident angle of 45 degrees and the third dichroic mirror 8 and then is input into the light inlet face of the second frequency doubling crystal 7, and the second frequency doubling crystal 7 doubles the frequency of the first laser beam and then outputs a second frequency doubling light beam; adjusting the azimuth angle or the pitch angle of the second frequency doubling crystal 7 to ensure that the frequency doubling efficiency of the second frequency doubling crystal is highest;
step 4, the second laser beam is reflected by the polarizer 2 with the incident angle of 45 degrees by a reflection angle of 90 degrees and then is input into the light incident surface of the first frequency doubling crystal 3, and the first frequency doubling crystal 3 doubles the frequency of the second laser beam and outputs a first frequency doubling light beam; adjusting the azimuth angle or the pitch angle of the first frequency doubling crystal 3 to ensure that the frequency doubling efficiency of the first frequency doubling crystal 3 is highest;
and 5, sequentially adjusting the azimuth angles or the pitch angles of the first dichroic mirror 4, the second dichroic mirror 6 and the third dichroic mirror 8 to combine the first frequency-doubled light with the first laser beam of the polarizing plate 2 which penetrates through the incident angle of 45 degrees.
In the method according to the second aspect of the present invention, the spectral ratio adjustment range of the first laser beam and the second laser beam is: 0-100%, and adjusting the light splitting ratio according to actual requirements.
The method according to the second aspect of the present invention, the splitting ratio of the first laser beam to the second laser beam is: 50:50.
The method according to the second aspect of the present invention, step 5 comprises: and the azimuth angles or the pitch angles of the first dichroic mirror 4, the second dichroic mirror 6 and the third dichroic mirror 8 are sequentially adjusted to enable the first frequency doubling light and the second frequency doubling light to be coaxially output.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the embodiments of the present invention and not for limiting, and although the embodiments of the present invention are described in detail with reference to the above preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the embodiments of the present invention without departing from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A laser frequency doubling device, comprising: the device comprises a wave plate, a polaroid with a preset light splitting angle, a first frequency doubling crystal, a second frequency doubling crystal, a first dichroic mirror, a second dichroic mirror, a third dichroic mirror and a laser absorption device;
the polarization state of the input laser beam is adjusted by the input laser beam through the wave plate, and the polarization plate with the preset light splitting angle divides the laser beam into two laser beams with different propagation directions according to the polarization states which are mutually vertical;
the first laser beam continues to be transmitted along the original propagation direction, penetrates through the polaroid with the preset light splitting angle and the third dichroic mirror, is input into the light incident surface of the second frequency doubling crystal, and outputs a second frequency doubling light beam after frequency doubling of the second frequency doubling crystal;
the second laser beam is reflected to the first frequency doubling crystal light incoming surface by the polaroid with the preset light splitting angle at the preset reflection angle, and the first frequency doubling light beam is output after frequency doubling of the first frequency doubling crystal;
and the first frequency doubling light beam output by the first frequency doubling crystal in a frequency doubling way sequentially passes through the first dichroic mirror, the second dichroic mirror and the third dichroic mirror, is combined into the first laser beam, passes through the second frequency doubling crystal and is combined with the second frequency doubling light beam for output.
2. The apparatus of claim 1, wherein the first frequency doubling crystal and the second frequency doubling crystal are each provided with a temperature control device for cooling the first frequency doubling crystal and the second frequency doubling crystal.
3. The apparatus of claim 1, wherein the temperature control devices of the first frequency doubling crystal and the second frequency doubling crystal are thermostatically controlled.
4. The apparatus of claim 1, wherein the wave plate is a half wave plate; the polarizing plate of the predetermined splitting angle is a polarizing plate of a 45 ° incident angle, and the polarizing plate of the 45 ° incident angle is disposed at a 45 ° incident angle with respect to an optical axis of the incident laser beam.
5. The apparatus of claim 1, wherein the first dichroic mirror, the second dichroic mirror, and the third dichroic mirror are all 45 ° incident angle mirrors, and both mirror surfaces thereof are coated with a 45 ° incident angle frequency doubling light high reflection film and a 45 ° incident angle antireflection film of an original laser beam.
6. The apparatus according to claim 1, wherein laser absorption means having an area larger than that of the laser beam or the frequency-doubled beam are respectively disposed at predetermined distances in the optical axis direction on the back surfaces of the first dichroic mirror and the second dichroic mirror.
7. A method for frequency doubling of laser light, using the laser frequency doubling device according to any of claims 1 to 6, comprising the steps of:
step 1, adjusting the polarization direction of an input laser beam by using a wave plate so as to adjust the light splitting ratio of a first laser beam and a second laser beam;
step 2, dividing the laser beam into a first laser beam and a second laser beam according to a polarization state by using a polarizing film;
step 3, the first laser beam penetrates through the polaroid and the third dichroic mirror and then is input into the light incident surface of the second frequency doubling crystal, and the second frequency doubling crystal doubles the frequency of the first laser beam and outputs a second frequency doubling light beam; adjusting the azimuth angle or the pitch angle of the second frequency doubling crystal to enable the frequency doubling efficiency of the second frequency doubling crystal to be highest;
step 4, the second laser beam is reflected by the polaroid and then input to the light incident surface of the first frequency doubling crystal, and the first frequency doubling crystal doubles the frequency of the second laser beam and outputs a first frequency doubling light beam; adjusting the azimuth angle or the pitch angle of a first frequency doubling crystal to enable the frequency doubling efficiency of the first frequency doubling crystal to be highest;
and 5, sequentially adjusting azimuth angles or pitch angles of the first dichroic mirror, the second dichroic mirror and the third dichroic mirror to enable the first frequency doubling light and the first laser beam penetrating through the polaroid to be combined.
8. The method of claim 7, wherein the spectral ratio adjustment range of the first laser beam to the second laser beam is: 0-100%, and adjusting the light splitting ratio according to actual requirements.
9. The method of claim 7, wherein the first laser beam and the second laser beam have a split ratio of: 50:50.
10. The method of claim 7, wherein step 5 comprises: and sequentially adjusting the azimuth angles or the pitch angles of the first dichroic mirror, the second dichroic mirror and the third dichroic mirror to enable the first frequency doubling light and the second frequency doubling light to be coaxially output.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211719493.5A CN115693374A (en) | 2022-12-30 | 2022-12-30 | Laser frequency doubling device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211719493.5A CN115693374A (en) | 2022-12-30 | 2022-12-30 | Laser frequency doubling device |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4413342A (en) * | 1980-11-20 | 1983-11-01 | Quantronix Corporation | Method and apparatus for frequency doubling a laser beam |
| CN106911062A (en) * | 2017-04-13 | 2017-06-30 | 江苏天元激光科技有限公司 | A kind of green glow output optical fibre laser |
| CN107394575A (en) * | 2017-08-24 | 2017-11-24 | 南京先进激光技术研究院 | The frequency doubling device of laser |
| CN107863680A (en) * | 2017-12-29 | 2018-03-30 | 中国工程物理研究院应用电子学研究所 | A kind of continuously adjustabe dual-wavelength laser output device |
| CN212342997U (en) * | 2020-11-02 | 2021-01-12 | 北京东方锐镭科技有限公司 | High-efficiency frequency doubling switching device with strong environmental adaptability |
-
2022
- 2022-12-30 CN CN202211719493.5A patent/CN115693374A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4413342A (en) * | 1980-11-20 | 1983-11-01 | Quantronix Corporation | Method and apparatus for frequency doubling a laser beam |
| CN106911062A (en) * | 2017-04-13 | 2017-06-30 | 江苏天元激光科技有限公司 | A kind of green glow output optical fibre laser |
| CN107394575A (en) * | 2017-08-24 | 2017-11-24 | 南京先进激光技术研究院 | The frequency doubling device of laser |
| CN107863680A (en) * | 2017-12-29 | 2018-03-30 | 中国工程物理研究院应用电子学研究所 | A kind of continuously adjustabe dual-wavelength laser output device |
| CN212342997U (en) * | 2020-11-02 | 2021-01-12 | 北京东方锐镭科技有限公司 | High-efficiency frequency doubling switching device with strong environmental adaptability |
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Application publication date: 20230203 |