CN208571222U - A kind of inner cavity frequency-doubling formula dual laser of changeable output - Google Patents
A kind of inner cavity frequency-doubling formula dual laser of changeable output Download PDFInfo
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- CN208571222U CN208571222U CN201821296193.XU CN201821296193U CN208571222U CN 208571222 U CN208571222 U CN 208571222U CN 201821296193 U CN201821296193 U CN 201821296193U CN 208571222 U CN208571222 U CN 208571222U
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Abstract
The utility model discloses a kind of inner cavity frequency-doubling formula dual laser of changeable output, it is disposed with pump coupling lens group, front cavity mirror, laser crystal, Q-switch and the first half-wave plate along incident light axis, the outgoing end face of laser crystal is cut with Brewster's angle inclined-plane, is placed with inclined polarizing film on the optical axis of the first half-wave plate emergent light；The second half-wave plate, inclined fundamental frequency and frequency multiplication spectroscope, frequency-doubling crystal and Effect of Back-Cavity Mirror are disposed on the reflection optical axis of polarizing film；Fundamental frequency light outgoing mirror is provided in the transmission optical axis of polarizing film；Frequency doubled light total reflective mirror is provided on fundamental frequency and the spectroscopical reflection optical axis of frequency multiplication；The optical axis of first half-wave plate and the polarization direction of incident laser are parallel, fundamental frequency and the high saturating and frequency doubled light high-reflecting film of frequency multiplication spectroscope plating fundamental frequency light, Effect of Back-Cavity Mirror plates fundamental frequency light and the double high-reflecting films of frequency doubled light, it is able to achieve being switched fast for intracavity frequency doubling laser frequency doubled light and fundamental frequency light, and that realizes two wavelength is switched fast output.
Description
Technical field
The utility model relates to field of laser device technology more particularly to a kind of inner cavity frequency-doubling formula dual wavelengths of changeable output
Laser.
Background technique
Currently, multi-wavelength export structure is all the popular developing direction of laser all the time, most research is all concentrated
It, can be more easily by various because frequency-doubling crystal is located at outside the chamber of laser in cavity external frequency multiplication structure in cavity external frequency multiplication
Switching device realizes the switching of wavelength；In entire handoff procedure, fundamental frequency is actually immovable, so this class formation is only
Suitable for the higher pulse laser of energy density.
In the prior art, for two frequency double lasers that the pulse operating of high repetition frequency or continuous wave operate,
Since chamber external power density is lower, if will lead to two double-frequency laser output works of laser using the structure of cavity external frequency multiplication
Rate is very low, so this kind of laser is usually all the structure using intracavity frequency doubling, i.e., it is close by the higher power of intracavity frequency doubling
It spends to improve the output power of laser；And for intracavity frequency doubling laser, it is also desirable to while realizing the defeated of basic frequency laser
Out, but due to the frequency-doubling crystal of this kind of laser be placed on it is intracavitary, so real like that without image of Buddha cavity external frequency multiplication multiple-wavelength laser
The switching of existing output wavelength.
Utility model content
According to the above deficiency, the utility model provides the fast of a kind of achievable intracavity frequency doubling laser frequency doubled light and fundamental frequency light
The inner cavity frequency-doubling formula dual laser of speed switching, the changeable output for being switched fast output of two wavelength of realization.
To achieve the above object, the utility model provides a kind of inner cavity frequency-doubling formula dual laser of changeable output,
The inner cavity frequency-doubling formula dual laser of the changeable output includes the pump coupling lens set gradually along incident light axis
The outgoing end face of group, front cavity mirror, laser crystal, Q-switch and the first half-wave plate, laser crystal is cut with Brewster's angle inclined-plane,
Inclined polarizing film is placed on the optical axis of first half-wave plate emergent light；The second half are disposed on the reflection optical axis of polarizing film
Wave plate, inclined fundamental frequency and frequency multiplication spectroscope, frequency-doubling crystal and Effect of Back-Cavity Mirror；It is defeated that fundamental frequency light is provided in the transmission optical axis of polarizing film
Appearance；Frequency doubled light total reflective mirror is provided on fundamental frequency and the spectroscopical reflection optical axis of frequency multiplication；The optical axis of first half-wave plate and incidence swash
The polarization direction of light is parallel, and fundamental frequency and frequency multiplication spectroscope plating fundamental frequency light are high thoroughly and frequency doubled light high-reflecting film, Effect of Back-Cavity Mirror plate fundamental frequency light and
The double high-reflecting films of frequency doubled light, the angle between the optical axis and incident laser polarization direction of the second half-wave plate is 45 °.
The inner cavity frequency-doubling formula dual laser of the changeable output of the utility model, using laser crystal cutting cloth scholar this
Special angle inhibits the laser generation of a polarization direction, at the same it is intracavitary free polarization is further suppressed by polarizing film, swash fundamental frequency
Light can only the starting of oscillation in a manner of linear polarization.
The first situation, double-frequency laser output: the light being emitted from laser crystal by Q-switch again to the first half-wave plate, the
In the state for not changing polarization direction, (optical axis of the first half-wave plate is parallel with incident laser polarization direction i.e. for half of wave plate work
Can), optical path is converted to horizontal polarization light after have passed through the second half-wave plate after reflecting using polarizing film, using fundamental frequency and again
Frequency division light microscopic (plated film is that fundamental frequency light is high thoroughly, and frequency doubled light is high anti-) reaches frequency-doubling crystal, and then arriving Effect of Back-Cavity Mirror again, (plated film is fundamental frequency light
It is double high anti-with frequency doubled light), in the resonant cavity that laser constrains in front cavity mirror at this time and Effect of Back-Cavity Mirror is formed, frequency doubled light is from fundamental frequency and frequency multiplication
Spectroscope reflection output is gone out using horizontal output after the reflection of frequency doubled light total reflective mirror.
Second situation, basic frequency laser output: the light being emitted from laser crystal by Q-switch again to the first half-wave plate, the
Half of wave plate work is changing the state of 90 ° of polarization direction (between the optical axis and incident laser polarization direction of the first half-wave plate
Angle is 45 °), optical path will reach fundamental frequency light outgoing mirror directly through polarizing film, and laser constrains in front cavity mirror and fundamental frequency light at this time
In the resonant cavity that outgoing mirror is formed, fundamental frequency light horizontal output after fundamental frequency light outgoing mirror.
The utility model advantage is as follows:
The inner cavity frequency-doubling formula dual laser of the changeable output of the utility model, fundamental frequency light and frequency doubled light while work
Make to greatly improve the respective power of twin wavelength laser output in optimum efficiency；It can be realized intracavity frequency doubling laser frequency doubled light
With being switched fast for fundamental frequency light, the output that is switched fast of two wavelength is realized, and do not need to carry out light in wavelength switching output
Road adjustment.
Detailed description of the invention
Fig. 1 is the structure of the inner cavity frequency-doubling formula dual laser of the changeable output of one embodiment of the utility model
And its double-frequency laser output light path schematic diagram.
Fig. 2 is the inner cavity frequency-doubling formula dual laser of the changeable output of the embodiment as described in Figure 1 of the utility model
Structure and its basic frequency laser output light path schematic diagram.
Fig. 3 is the knot of the inner cavity frequency-doubling formula dual laser of the changeable output of another embodiment of the utility model
Structure and its double-frequency laser output light path schematic diagram.
Fig. 4 is the inner cavity frequency-doubling formula dual laser of the changeable output of the embodiment as described in Figure 3 of the utility model
Structure and its basic frequency laser output light path schematic diagram.
Fig. 5 is the inner cavity frequency-doubling formula dual laser of the changeable output of the embodiment as described in Figure 3 of the utility model
Wave plate rotating device structural schematic diagram.
Description of symbols:
1 is pump coupling lens group, and 2 be front cavity mirror, and 3 be laser crystal, and 4 be Q-switch, and 5 be the first half-wave plate, and 6 be inclined
Shake piece, and 7 be the second half-wave plate, and 8 be fundamental frequency and frequency multiplication spectroscope, and 9 be frequency-doubling crystal, and 10 be Effect of Back-Cavity Mirror, and 11 be fundamental frequency light output
Mirror, 12 be frequency doubled light total reflective mirror；13 be driving gear, and 14 be support tube, and 15 be the first half-wave plate cylinder.
Specific embodiment
Specific embodiment of the present invention is described with reference to the accompanying drawings and embodiments:
Embodiment 1:
A kind of inner cavity frequency-doubling formula dual laser of changeable output, referring to Fig. 1, the inner cavity times of the changeable output
Frequency formula dual laser includes the pump coupling lens group 1 set gradually along incident light axis, front cavity mirror 2, laser crystal 3, Q
Switch 4 and the first half-wave plate 5, the outgoing end face of laser crystal 3 are cut with Brewster's angle inclined-plane, 5 emergent light of the first half-wave plate
Optical axis on be placed with inclined polarizing film 6；The second half-wave plate 7, inclined base are disposed on the reflection optical axis of polarizing film 6
Frequency and frequency multiplication spectroscope 8, frequency-doubling crystal 9 and Effect of Back-Cavity Mirror 10；Fundamental frequency light outgoing mirror 11 is provided in the transmission optical axis of polarizing film 6；
Frequency doubled light total reflective mirror 12 is provided on the reflection optical axis of fundamental frequency and frequency multiplication spectroscope 8；The optical axis and incident laser of first half-wave plate 5
Polarization direction it is parallel, it is high thoroughly and frequency doubled light high-reflecting film that fundamental frequency and frequency multiplication spectroscope 8 plate fundamental frequency light, Effect of Back-Cavity Mirror 10 plate fundamental frequency light and
The double high-reflecting films of frequency doubled light, the angle between the optical axis and incident laser polarization direction of the first half-wave plate 5 is 45 °.
The inner cavity frequency-doubling formula dual laser of the changeable output of the utility model cuts cloth scholar using laser crystal 3
This special angle inhibits the laser generation of a polarization direction, at the same it is intracavitary free polarization is further suppressed by polarizing film 6, make fundamental frequency
Laser can only the starting of oscillation in a manner of linear polarization.
The first situation, double-frequency laser output: referring to Fig. 1, the light being emitted from laser crystal 3 is by Q-switch 4 again to first
Half-wave plate 5, the first half-wave plate 5 work in optical axis and the incident laser polarization for the first half-wave plate of state 5 for not changing polarization direction
Direction is parallel, and optical path is converted to horizontal polarization light after have passed through the second half-wave plate 7 after reflecting using polarizing film 6, then
It is that fundamental frequency light is high thoroughly by fundamental frequency and 8 plated film of frequency multiplication spectroscope, frequency doubled light is high instead to reach frequency-doubling crystal 9, then arrives Effect of Back-Cavity Mirror again
10 plated films are that fundamental frequency light and frequency doubled light are double high anti-, in the resonant cavity that laser constrains in front cavity mirror 2 at this time and Effect of Back-Cavity Mirror 10 is formed, times
Frequency light is gone out from fundamental frequency and the reflection of frequency multiplication spectroscope 8 output using horizontal output after the reflection of frequency doubled light total reflective mirror 12.
Second situation, basic frequency laser output: referring to fig. 2, the light being emitted from laser crystal 3 is by Q-switch 4 again to first
Half-wave plate 5, the work of the first half-wave plate 5 are polarized in the optical axis and incident laser for changing the first half-wave plate of state 5 of 90 ° of polarization direction
Angle between direction is 45 °, and optical path will reach fundamental frequency light outgoing mirror 11 directly through polarizing film 6, before laser constrains at this time
In the resonant cavity that hysteroscope 2 and fundamental frequency light outgoing mirror 11 are formed, fundamental frequency light horizontal output after fundamental frequency light outgoing mirror 11.
Embodiment 2:
A kind of inner cavity frequency-doubling formula dual laser of changeable output, it is similar to Example 1, the difference is that referring to
Fig. 3, pump coupling lens group 1, front cavity mirror 2, laser crystal 3, Q-switch 4, the first half-wave plate 5, polarizing film 6, the second half-wave plate 7,
Fundamental frequency and frequency multiplication spectroscope 8, frequency-doubling crystal 9, Effect of Back-Cavity Mirror 10, fundamental frequency light outgoing mirror 11 and frequency doubled light total reflective mirror 12 are separately positioned on
On erection support.
In such manner, it is possible to facilitate pump coupling lens group 1, front cavity mirror 2, laser crystal 3, Q-switch 4, the first half-wave plate 5, partially
Shake piece 6, the second half-wave plate 7, fundamental frequency and frequency multiplication spectroscope 8, frequency-doubling crystal 9, Effect of Back-Cavity Mirror 10, fundamental frequency light outgoing mirror 11 and frequency doubled light
The installation of total reflective mirror 12.
In another specific embodiment, referring to fig. 4, the bottom of the erection support is respectively arranged with mounting base, institute
Mounting base is stated to connect with mounting platform.
In such manner, it is possible to which the erection support is facilitated to connect by the mounting base with mounting platform.
It should be noted that the erection support can be an integral structure with the mounting base, the erection support
It may be the metalwork being connect by welding structure with the mounting base.
In another specific embodiment, equally distributed at least two fixed spiral shells are respectively arranged on the mounting base
Hole is respectively arranged with fixing bolt in fixing threaded hole, is respectively arranged on the mounting platform matched with the fixing threaded hole
Installation screw, the mounting base and mounting platform pass through the fixation spiral shell being arranged in the fixing threaded hole and the installation screw
Bolt is connected.
In such manner, it is possible to which the mounting base is facilitated to connect by fixing bolt with mounting platform.
In another specific embodiment, it is respectively arranged with the installation aperture of through-hole type on the erection support, pumps coupling
Close lens group 1, front cavity mirror 2, laser crystal 3, Q-switch 4, the first half-wave plate 5, polarizing film 6, the second half-wave plate 7, fundamental frequency and frequency multiplication
Spectroscope 8, frequency-doubling crystal 9, Effect of Back-Cavity Mirror 10, fundamental frequency light outgoing mirror 11 and frequency doubled light total reflective mirror 12 are separately mounted to the mounting hole
In diameter.
In such manner, it is possible to facilitate pump coupling lens group 1, front cavity mirror 2, laser crystal 3, Q-switch 4, the first half-wave plate 5, partially
Shake piece 6, the second half-wave plate 7, fundamental frequency and frequency multiplication spectroscope 8, frequency-doubling crystal 9, Effect of Back-Cavity Mirror 10, fundamental frequency light outgoing mirror 11 and frequency doubled light
Total reflective mirror 12 is mounted in the erection support by installing aperture.
In another specific embodiment, pump coupling lens group 1, front cavity mirror 2, laser crystal 3, Q-switch 4, the first half
Wave plate 5, polarizing film 6, the second half-wave plate 7, fundamental frequency and frequency multiplication spectroscope 8, frequency-doubling crystal 9, Effect of Back-Cavity Mirror 10, fundamental frequency light outgoing mirror 11
Pass through glue-line respectively with the side wall of frequency doubled light total reflective mirror 12 to connect with the side wall in the installation aperture.
In such manner, it is possible to facilitate pump coupling lens group 1, front cavity mirror 2, laser crystal 3, Q-switch 4, the first half-wave plate 5, partially
Shake piece 6, the second half-wave plate 7, fundamental frequency and frequency multiplication spectroscope 8, frequency-doubling crystal 9, Effect of Back-Cavity Mirror 10, fundamental frequency light outgoing mirror 11 and frequency doubled light
Total reflective mirror 12 is mounted in installation aperture by glue-line.
In another specific embodiment, referring to Fig. 5, the erection support of the first half-wave plate 5 is set as wave plate rotation
The structure of device, the wave plate rotating device include the driving gear 13 being arranged on the mounting base, driving gear 13
Central axis is parallel with the optical axis of the first half-wave plate 5, and the erection support of the first half-wave plate 5 includes columnar support tube 14,
Columnar first half-wave plate cylinder 15 is arranged in the end of support tube 14, the outer wall of the first half-wave plate cylinder 15 is set as and active
The driven gear structure that gear 13 engages.
In such manner, it is possible to by rotation driving gear 13, so that driving gear 13 drives the driven gear structure being engaged with
Rotation, to drive the first half-wave plate cylinder 15 and the rotation of the first half-wave plate 5.
In another specific embodiment, be fixedly connected with rotary shaft at the center of driving gear 13, the rotary shaft with
The center overlapping of axles of driving gear 13, the rotary shaft pass through the axis hole on axillare, and the axillare is connected to the mounting base
On.
In such manner, it is possible to facilitate the installation of driving gear 13.The rotary shaft and the center of driving gear 13 can be set to
Integral structure, the rotary shaft may be set to be the metalwork connecting by welding structure with driving gear 13.Axillare can
To be an integral structure with mounting base.Axillare may be the metalwork being connect by welding structure with mounting base.
In another specific embodiment, circumferential angle index layer is provided on the first half-wave plate cylinder 15.In such manner, it is possible to
Facilitate record and operate the first half-wave plate 5 and passes through the angle that the first half-wave plate cylinder 15 rotates.
It should be noted that pointer scale layer can be set on the side wall of support tube 14.It can be carved in this way by pointer
Spend the initial angle scale and postrotational angle index of the first half-wave plate of indicator marker cylinder 15 on layer.To facilitate record and
Calculate the first half-wave plate 5 initial angle and postrotational angle.
In another specific embodiment, the end of the rotary shaft is connect with rotating handles.In such manner, it is possible to conveniently pass through
Rotating handles to rotary shaft carry out rotation process, thus drive driving gear 13, the first half-wave plate cylinder 15 and the first half-wave plate 5 into
Row rotation.
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the utility model is not limited to
Above embodiment can also not depart from the utility model within the knowledge of a person skilled in the art
It is made a variety of changes under the premise of objective.
Many other changes and modifications may be made without departing from the spirit and scope of the utility model.It should be appreciated that this reality
It is not limited to specific embodiment with novel, the scope of the utility model is defined by the following claims.
Claims (10)
1. a kind of inner cavity frequency-doubling formula dual laser of changeable output, the inner cavity frequency-doubling formula dual wavelength of the changeable output
Laser includes the pump coupling lens group (1) set gradually along incident light axis, front cavity mirror (2), laser crystal (3), Q-switch
(4) and the first half-wave plate (5), which is characterized in that the outgoing end face of laser crystal (3) is cut with Brewster's angle inclined-plane, and first
Inclined polarizing film (6) are placed on the optical axis of half-wave plate (5) emergent light；It is disposed on the reflection optical axis of polarizing film (6)
Second half-wave plate (7), inclined fundamental frequency and frequency multiplication spectroscope (8), frequency-doubling crystal (9) and Effect of Back-Cavity Mirror (10)；Polarizing film (6) it is saturating
It penetrates on optical axis and is provided with fundamental frequency light outgoing mirror (11)；It is complete that frequency doubled light is provided on the reflection optical axis of fundamental frequency and frequency multiplication spectroscope (8)
Anti- mirror (12)；The optical axis of first half-wave plate (5) is parallel with the polarization direction of incident laser, and fundamental frequency and frequency multiplication spectroscope (8) plate base
The high saturating and frequency doubled light high-reflecting film of frequency light, Effect of Back-Cavity Mirror (10) plate fundamental frequency light and the double high-reflecting films of frequency doubled light, the optical axis of the first half-wave plate (5)
Angle between incident laser polarization direction is 45 °.
2. the inner cavity frequency-doubling formula dual laser of changeable output as described in claim 1, which is characterized in that pump coupling
Lens group (1), front cavity mirror (2), laser crystal (3), Q-switch (4), the first half-wave plate (5), polarizing film (6), the second half-wave plate
(7), fundamental frequency and frequency multiplication spectroscope (8), frequency-doubling crystal (9), Effect of Back-Cavity Mirror (10), fundamental frequency light outgoing mirror (11) and frequency doubled light total reflective mirror
(12) it is separately positioned on erection support.
3. the inner cavity frequency-doubling formula dual laser of changeable output as claimed in claim 2, which is characterized in that the installation
The bottom of support is respectively arranged with mounting base, and the mounting base is connect with mounting platform.
4. the inner cavity frequency-doubling formula dual laser of changeable output as claimed in claim 3, which is characterized in that the installation
It is respectively arranged with equally distributed at least two fixing threaded hole on bottom plate, is respectively arranged with fixing bolt in fixing threaded hole, it is described
Be respectively arranged on mounting platform with the matched installation screw of the fixing threaded hole, the mounting base and mounting platform are by setting
It sets and is connected in the fixing threaded hole with the fixing bolt in the installation screw.
5. the inner cavity frequency-doubling formula dual laser of changeable output as claimed in claim 4, which is characterized in that the installation
The installation aperture of through-hole type is respectively arranged on support, pump coupling lens group (1), front cavity mirror (2), laser crystal (3), Q are opened
Close (4), the first half-wave plate (5), polarizing film (6), the second half-wave plate (7), fundamental frequency and frequency multiplication spectroscope (8), frequency-doubling crystal (9),
Effect of Back-Cavity Mirror (10), fundamental frequency light outgoing mirror (11) and frequency doubled light total reflective mirror (12) are separately mounted in the installation aperture.
6. the inner cavity frequency-doubling formula dual laser of changeable output as claimed in claim 5, which is characterized in that pump coupling
Lens group (1), front cavity mirror (2), laser crystal (3), Q-switch (4), the first half-wave plate (5), polarizing film (6), the second half-wave plate
(7), fundamental frequency and frequency multiplication spectroscope (8), frequency-doubling crystal (9), Effect of Back-Cavity Mirror (10), fundamental frequency light outgoing mirror (11) and frequency doubled light total reflective mirror
(12) side wall passes through glue-line respectively and connect with the side wall in the installation aperture.
7. the inner cavity frequency-doubling formula dual laser of changeable output as claimed in claim 6, which is characterized in that the first half-wave
The erection support of piece (5) is set as the structure of wave plate rotating device, and the wave plate rotating device includes being arranged in the peace
The driving gear (13) on bottom plate is filled, the central axis of driving gear (13) is parallel with the optical axis of the first half-wave plate (5), the first half-wave
The erection support of piece (5) includes columnar support tube (14), and columnar is arranged in the end of support tube (14)
The outer wall of half of wave plate cylinder (15), the first half-wave plate cylinder (15) is set as the driven gear structure engaged with driving gear (13).
8. the inner cavity frequency-doubling formula dual laser of changeable output as claimed in claim 7, which is characterized in that driving gear
(13) rotary shaft, the center overlapping of axles of the rotary shaft and driving gear (13), the rotary shaft are fixedly connected at center
Axis hole on axillare, the axillare are connected on the mounting base.
9. the inner cavity frequency-doubling formula dual laser of changeable output as claimed in claim 8, which is characterized in that the first half-wave
Circumferential angle index layer is provided on piece cylinder (15).
10. the inner cavity frequency-doubling formula dual laser of changeable output as claimed in claim 9, which is characterized in that the rotation
The end of shaft is connect with rotating handles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821296193.XU CN208571222U (en) | 2018-08-13 | 2018-08-13 | A kind of inner cavity frequency-doubling formula dual laser of changeable output |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821296193.XU CN208571222U (en) | 2018-08-13 | 2018-08-13 | A kind of inner cavity frequency-doubling formula dual laser of changeable output |
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| Publication Number | Publication Date |
|---|---|
| CN208571222U true CN208571222U (en) | 2019-03-01 |
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| CN201821296193.XU Active CN208571222U (en) | 2018-08-13 | 2018-08-13 | A kind of inner cavity frequency-doubling formula dual laser of changeable output |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111106515A (en) * | 2019-12-31 | 2020-05-05 | 武汉奇致激光技术股份有限公司 | Multi-wavelength laser and optical equipment |
| CN112269260A (en) * | 2020-09-27 | 2021-01-26 | 北京卓镭激光技术有限公司 | Laser switching device and method |
-
2018
- 2018-08-13 CN CN201821296193.XU patent/CN208571222U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111106515A (en) * | 2019-12-31 | 2020-05-05 | 武汉奇致激光技术股份有限公司 | Multi-wavelength laser and optical equipment |
| CN111106515B (en) * | 2019-12-31 | 2021-11-30 | 武汉奇致激光技术股份有限公司 | Multi-wavelength laser and optical equipment |
| CN112269260A (en) * | 2020-09-27 | 2021-01-26 | 北京卓镭激光技术有限公司 | Laser switching device and method |
| CN112269260B (en) * | 2020-09-27 | 2023-03-21 | 北京卓镭激光技术有限公司 | Laser switching device and method |
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