CN107394575A - The frequency doubling device of laser - Google Patents
The frequency doubling device of laser Download PDFInfo
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- CN107394575A CN107394575A CN201710735742.2A CN201710735742A CN107394575A CN 107394575 A CN107394575 A CN 107394575A CN 201710735742 A CN201710735742 A CN 201710735742A CN 107394575 A CN107394575 A CN 107394575A
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- 239000013078 crystal Substances 0.000 claims abstract description 68
- 230000003287 optical effect Effects 0.000 claims abstract description 44
- 230000010287 polarization Effects 0.000 claims description 13
- 230000009467 reduction Effects 0.000 claims description 12
- 230000005540 biological transmission Effects 0.000 claims description 11
- VCZFPTGOQQOZGI-UHFFFAOYSA-N lithium bis(oxoboranyloxy)borinate Chemical compound [Li+].[O-]B(OB=O)OB=O VCZFPTGOQQOZGI-UHFFFAOYSA-N 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- WYOHGPUPVHHUGO-UHFFFAOYSA-K potassium;oxygen(2-);titanium(4+);phosphate Chemical compound [O-2].[K+].[Ti+4].[O-]P([O-])([O-])=O WYOHGPUPVHHUGO-UHFFFAOYSA-K 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 3
- 238000002310 reflectometry Methods 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 abstract description 25
- 238000000034 method Methods 0.000 description 15
- 230000008569 process Effects 0.000 description 11
- 230000006378 damage Effects 0.000 description 6
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 230000008832 photodamage Effects 0.000 description 1
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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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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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/10—Beam splitting or combining systems
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/283—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for beam splitting or combining
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- Optics & Photonics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Lasers (AREA)
Abstract
A kind of frequency doubling device of laser is disclosed, belongs to optical technical field.Wherein, incident light is incident to the first spectroscope by the first frequency-doubling crystal, is the first transmitted light and the first reflected light by the first spectroscope beam splitting.First transmitted light successively by shrink beam microscope group, the second frequency-doubling crystal, expand microscope group and the first half-wave plate after be incident to the 3rd spectroscope, it is the second transmitted light and the second reflected light by the 3rd spectroscope beam splitting, the second reflected light is incident to polarised light Amici prism and reflects to form the 3rd reflected light by polarised light Amici prism.First reflected light is incident to the second spectroscope, and the 4th reflected light is obtained after the second dichroic mirror, and the 4th reflected light is incident to polarised light Amici prism after the second half-wave plate and transmits to form the 3rd transmitted light by polarised light Amici prism.3rd reflected light is collectively forming light beam with the 3rd transmitted light.It can improve the conversion ratio during laser-doubled.
Description
Technical Field
The invention relates to the technical field of optics, in particular to a frequency doubling device of a laser.
Background
Frequency conversion is an effective technique for expanding the application range of high power lasers, and it utilizes the nonlinear optical effect of optical media under strong radiation field to generate new frequencies. Frequency doubling is the most widely used technique in nonlinear optics, and generally we want to obtain higher conversion efficiency from fundamental light to frequency doubled light.
Generally, there are two main approaches to increase the conversion efficiency of the frequency doubling process: (1) the peak power density of the fundamental light is increased. Under the condition of given laser pulse energy and pulse width, the method for improving the peak power density is to reduce the size of a light spot, and the method has the defects that when the light spot is reduced to a certain degree, the peak power density of the laser exceeds the damage threshold of a coating film on the end face of a laser crystal, so that a device is damaged; (2) the frequency doubling crystal length is increased. The conversion efficiency decreases as the peak power density of the fundamental frequency light in the frequency doubling crystal is gradually reduced. Therefore, when the frequency doubling crystal length is increased to a certain length, the frequency doubling efficiency of the crystal length is not obviously improved.
Disclosure of Invention
In view of this, the present invention provides a frequency doubling device for a laser, which can improve the conversion rate in the frequency doubling process of the laser, and is therefore more practical.
In order to achieve the first object, the technical solution of the frequency doubling device for a laser provided by the present invention is as follows:
the frequency doubling device of the laser comprises a first frequency doubling crystal (1), a first spectroscope (2 a), a second spectroscope (2 b), a third spectroscope (2 c), a beam reducing mirror group (3), a second frequency doubling crystal (4), a beam expanding mirror group (5), a first half-wave plate (6 a), a second half-wave plate (6 b) and a polarization beam splitter prism (7),
incident light (X1) enters the first light splitter (2 a) through the first frequency doubling crystal (1), is split into first transmitted light (X2) and first reflected light (X3) by the first light splitter (2 a),
the first transmitted light (X2) sequentially passes through the beam reducing mirror group (3), the second frequency doubling crystal (4), the beam expanding mirror group (5) and the first half wave plate (6 a), then enters the third beam splitter (2 c), is split into second transmitted light (X6) and second reflected light (X4) by the third beam splitter (2 c), and the second reflected light (X4) enters the polarized light splitting prism (7) and is reflected by the polarized light splitting prism (7) to form third reflected light;
the first reflected light (X3) enters the second beam splitter (2 b), and is reflected by the second beam splitter (2 b) to obtain fourth reflected light (X5), and the fourth reflected light (X5) passes through the second half-wave plate (6 b), enters the polarized light splitting prism (7), and is transmitted by the polarized light splitting prism (7) to form third transmitted light;
the third reflected light and the third transmitted light together form a light beam (X7).
The frequency doubling device of the laser can be further realized by adopting the following technical measures.
Preferably, the beam reducing mirror group (3) comprises a first convex lens (3 a) and a first concave lens (3 b),
the first transmitted light (X2) passes through the first convex lens (2 a) and then passes through the first concave lens (3 b);
the main optical axis of the first convex lens (3 a) and the main optical axis of the first concave lens (3 b) are respectively positioned on the optical center extension line of the first transmission light (X2).
Preferably, the expander group (5) comprises a second concave lens (5 a) and a second convex lens (5 b),
the first transmitted light (X2) passes through the second concave lens (5 a) and then passes through the second convex lens (5 b);
the main optical axis of the second concave lens (5 a) and the main optical axis of the second convex lens (5 b) are respectively positioned on the optical center extension line of the first transmission light (X2).
Preferably, the first frequency doubling crystal (1) and/or the second frequency doubling crystal (4) are/is made of crystals composed of one of potassium titanyl phosphate or lithium triborate or a mixture of the two substances.
Preferably, the first frequency doubling crystal (1) and the second frequency doubling crystal (4) are both plated with a film for increasing the projection of fundamental frequency light and frequency doubling light.
Preferably, the first frequency doubling crystal (1) and the second frequency doubling crystal (4) are made of the same material.
Preferably, the cross-sectional area of the second frequency doubling crystal (4) is greater than or equal to half of the cross-sectional area of the first frequency doubling crystal (1).
Preferably, when the reduction factor of the reduction lens group (3) is m and the expansion factor of the beam expanding lens group (5) is n, m = n.
Preferably, the optical elements forming the beam reducing mirror group (3) and the optical elements forming the beam expanding mirror group (5) are coated with antireflection films of fundamental frequency light and frequency doubling light.
Preferably, the wavelengths of the first half-wave plate (6 a) and the second half-wave plate (6 b) are the frequency doubling wavelengths of light.
Preferably, antireflection films for fundamental frequency light and frequency doubling light are plated on the first half-wave plate (6 a) and the second half-wave plate (6 b).
Preferably, the polarization beam splitter prism is plated with a frequency doubling light antireflection film.
Preferably, the reflection surfaces of the first spectroscope (2 a), the second spectroscope (2 b) and the third spectroscope (2 c) are coated with a frequency doubling light high-reflection film with a reflectivity of more than 99.5%, and the two surfaces of the first spectroscope (2 a), the second spectroscope (2 b) and the third spectroscope (2 c) are coated with a fundamental frequency light antireflection film with a transmissivity of more than 99.5%.
In the application process of the frequency doubling device of the laser, the residual energy of the primary frequency light after the primary frequency doubling conversion is subjected to beam shrinking and then to frequency doubling conversion again, and the frequency doubling light obtained by the secondary conversion is output after beam expanding and the frequency doubling light obtained by the primary conversion so as to improve the frequency doubling efficiency. In addition, the traditional external cavity frequency doubling scheme is influenced by the damage threshold of an optical device, and the frequency doubling efficiency can only reach 50 percent; the frequency doubling device of the laser provided by the invention can be used for example, when the reduction times of the beam reducing lens group are 1.4 times and the expansion times of the beam expanding lens group are 1.4 times under the condition that an optical device is not damaged, wherein when the first frequency doubling conversion efficiency reaches 50%, the peak power density of the fundamental frequency light in the second frequency doubling process reaches the same level as that in the first frequency doubling process. Therefore, the conversion efficiency of the residual fundamental frequency light can reach 50% in the second frequency doubling conversion process, and therefore the frequency doubling efficiency can reach 75%. The beam-shrinking proportion and the beam-expanding proportion are both 1.4 times, 75% of frequency doubling efficiency can be achieved, the frequency doubling efficiency is 50-75% when the frequency doubling efficiency is larger than 1.4, and the peak power density at the second frequency doubling position exceeds the damage threshold value when the frequency doubling efficiency is smaller than 1.4. That is to say, under the condition of selecting proper reduction times of the beam reducing mirror group and expansion times of the beam expanding mirror group, the frequency doubling device of the laser provided by the invention can obviously improve the electro-optic conversion efficiency and simultaneously can reduce the complexity of a system.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a schematic diagram of optical elements and an optical path of a frequency doubling device of a laser according to an embodiment of the present invention.
Detailed Description
The invention aims to solve the problems in the prior art and provides a frequency doubling device of a laser, which can improve the conversion rate in the frequency doubling process of the laser, thereby being more practical.
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description of the frequency doubling device of a laser according to the present invention, its specific implementation, structure, features and effects will be provided in conjunction with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "an embodiment" refers to not necessarily the same embodiment. Furthermore, the features, structures, or characteristics of one or more embodiments may be combined in any suitable manner.
The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, with the specific understanding that: both a and B may be included, a may be present alone, or B may be present alone, and any of the three cases can be provided.
Referring to fig. 1, a frequency doubling device of a laser provided in an embodiment of the present invention includes a first frequency doubling crystal 1, a first beam splitter 2a, a second beam splitter 2b, a third beam splitter 2c, a beam reduction mirror 3, a second frequency doubling crystal 4, a beam expander mirror 5, a first half-wave plate 6a, a second half-wave plate 6b, and a polarization beam splitter 7. The incident light X1 enters the first beam splitter 2a through the first frequency doubling crystal 1, and is split into the first transmitted light X2 and the first reflected light X3 by the first beam splitter 2 a. The first transmitted light X2 sequentially passes through the beam reduction mirror group 3, the second frequency doubling crystal 4, the beam expander group 5 and the first half-wave plate 6a, then enters the third beam splitter 2c, is split into a second transmitted light X6 and a second reflected light X4 by the third beam splitter 2c, and the second reflected light X4 enters the polarization beam splitter 7 and is reflected by the polarization beam splitter 7 to form a third reflected light. The first reflected light X3 enters the second beam splitter 2b, and is reflected by the second beam splitter 2b to obtain a fourth reflected light X5, and the fourth reflected light X5 passes through the second half-wave plate 6b, enters the polarization beam splitter 7, and is transmitted by the polarization beam splitter 7 to form third transmitted light. The third reflected light and the third transmitted light form a light beam X7.
In the application process of the frequency doubling device of the laser, the residual energy of the primary frequency light after the primary frequency doubling conversion is subjected to beam shrinking and then to frequency doubling conversion again, and the frequency doubling light obtained by the secondary conversion is output after beam expanding and the frequency doubling light obtained by the primary conversion so as to improve the frequency doubling efficiency. In addition, the traditional external cavity frequency doubling scheme is influenced by the damage threshold of an optical device, and the frequency doubling efficiency can only reach 50 percent; the frequency doubling device of the laser can ensure that under the condition of not damaging an optical device, when the reduction multiple of the beam reducing lens group is 1.4 times and the expansion multiple of the beam expanding lens group is 1.4 times, wherein when the first frequency doubling conversion efficiency reaches 50 percent, the peak power density of the fundamental frequency light in the second frequency doubling process reaches the same level as that in the first frequency doubling process. Therefore, the conversion efficiency of the residual fundamental frequency light can reach 50% in the second frequency doubling conversion process, and therefore the frequency doubling efficiency can reach 75%. That is to say, under the condition of selecting proper reduction times of the beam reducing mirror group and expansion times of the beam expanding mirror group, the frequency doubling device of the laser provided by the invention can obviously improve the electro-optic conversion efficiency and simultaneously can reduce the complexity of a system.
The beam reducing lens group 3 includes a first convex lens 3a and a first concave lens 3 b. The first transmitted light X2 passes through the first convex lens 2a and then passes through the first concave lens 3 b. The main optical axis of the first convex lens 3a and the main optical axis of the first concave lens 3b are respectively located on the optical center extension line of the first transmitted light X2. Because the convex lens and the concave lens both have a refraction effect on light, the characteristic that light can be transmitted along a straight line can be changed according to the refractive index according to the position of the light incident on the convex lens or the concave lens, and in this case, only when the main optical axis of the first convex lens 3a and the main optical axis of the first concave lens 3b are respectively positioned on the optical center extension line of the first transmission light X2, the first transmission light X2 can still be transmitted along a straight line after sequentially passing through the first convex lens 3a and the first concave lens 3 b.
The beam expander group 5 includes a second concave lens 5a and a second convex lens 5 b. The first transmitted light X2 passes through the second concave lens 5a and then the second convex lens 5 b; the main optical axes of the second concave lens 5a and the second convex lens 5b are respectively located on the optical center extension line of the first transmitted light X2. Because the convex lens and the concave lens both have a refraction effect on light, the characteristic that light can be transmitted along a straight line can be changed according to the refractive index according to the position of the light incident on the convex lens or the concave lens, and in this case, only when the main optical axis of the second concave lens 5a and the main optical axis of the second convex lens 5b are respectively positioned on the optical center extension line of the first transmission light X2, the first transmission light X2 can still be transmitted along a straight line after sequentially passing through the second concave lens 5a and the second convex lens 5 b.
Wherein, the first frequency doubling crystal 1 and/or the second frequency doubling crystal 4 are/is made of crystals formed by one substance of potassium titanyl phosphate or lithium triborate or the mixture of the two substances. Wherein,
potassium titanyl phosphate (KTP) crystal is a nonlinear optical crystal that has excellent nonlinear optical properties and has gained wide attention and application. The KTP crystal is a positive optical double crystal, the light transmission wave band of the KTP crystal is 350 nm-4.5 um, and the phase matching (generally adopting II-type phase matching) of frequency multiplication, sum frequency and optical parametric oscillation of 1.064um neodymium ion laser and other wave band laser can be realized. The nonlinear coefficients d31, d32 and d33 are 1.4, 2.65 and 10.7pm/V respectively, and the d33 is more than 20 times of that of the KDP crystal d 36. The KTP crystal has a higher light damage resistance threshold value, and can be used for medium-power laser frequency doubling and the like. The KTP crystal has good mechanical property and physicochemical property, is insoluble in water and organic solvent, is not deliquescent, has a melting point of about 1150 ℃, is partially decomposed during melting, and has great temperature and angle latitude. The KTP crystal as a frequency conversion material is widely applied to various fields such as scientific research, technology and the like, and particularly as an optimal crystal for medium and small power frequency doubling. Frequency doublers and optical parametric amplifiers made of the crystal are applied to all-solid-state tunable laser sources.
Lithium triborate (LiB 3O5, abbreviated as LBO) is an excellent high-power ultraviolet frequency doubling crystal with wide light transmission band, high damage threshold and large acceptance angle. Its main properties include: transmission band: 0.165-3.2 μm, nonlinear coefficient: d31=1.05Pm/V, laser damage threshold: 25GW/cm2, frequency doubling conversion efficiency: 40-60% (1064 nm → 532 nm), application range: solid-state laser systems, in particular for high-power Nd: YAG frequency doubling, frequency tripling, optical parametric oscillation and amplification.
Wherein, the first frequency doubling crystal 1 and the second frequency doubling crystal 4 are both plated with antireflection films of fundamental frequency light and frequency doubling light. In this case, the light intensity loss is reduced by the introduction of the antireflection film during the light passes through the first frequency doubling crystal 1 and the second frequency doubling crystal 4, and therefore, the light passing through the first frequency doubling crystal 1 and the second frequency doubling crystal 4 can be transmitted with fidelity as much as possible.
The first frequency doubling crystal 1 and the second frequency doubling crystal 4 are made of the same material.
The sectional area of the second frequency doubling crystal 4 is larger than or equal to half of the sectional area of the first frequency doubling crystal 1. In this case, the cross-sectional area of the crystal can be such that the beam can pass through it completely, and the larger the cross-sectional area of the frequency doubling crystal, the higher the price. Since the area of the light spot at the second frequency doubling crystal 4 is only half of that at the first frequency doubling crystal 1, the light beam can completely pass through only if the sectional area of the second frequency doubling crystal 4 is larger than or equal to half of that of the first frequency doubling crystal 1. This is done to reduce costs.
Wherein, if the reduction multiple of the beam reducing lens group 3 is m and the expansion multiple of the beam expanding lens group 5 is n, then m = n. Which can ensure that the spot distribution of the light beam X7 is uniform. If m is not equal to n, the spot diameters of the light beam X4 and the light beam X5 are different, and the original spot energy distribution state is changed after the light beams are combined, so that the spot distribution of the light beam X7 is not uniform.
Wherein, the optical elements forming the beam reducing lens group 3 and the optical elements forming the beam expanding lens group 5 are both coated with antireflection films of fundamental frequency light and frequency doubling light.
The wavelengths of the first half-wave plate 6a and the second half-wave plate 6b are the wavelengths of the frequency doubling light. In this case, the two half-wave plates here have the function of changing the polarization directions of the two beams of frequency-doubled light passing through the half-wave plates, so as to realize the combined beam output of the two beams of frequency-doubled light at the polarization splitting prism 7. The light beam X5 passes through the half-wave plate 6b and becomes horizontally polarized light, and the light beam X4 passes through the half-wave plate 6a and becomes vertically polarized light. The half-wave plate has a wavelength range in use, for example, laser light having a wavelength of 1064nm is not suitable for the half-wave plate of 532 nm.
And antireflection films of fundamental frequency light and frequency doubling light are plated on the first half-wave plate 6a and the second half-wave plate 6 b. Thereby reducing the loss of light intensity after the light passes through the first half-wave plate 6a and the second half-wave plate 6 b.
Wherein, the polarization beam splitter prism is plated with a frequency doubling light anti-reflection film. Thereby reducing the loss of light intensity after the light passes through the polarization splitting prism.
The reflection surfaces of the first spectroscope 2a, the second spectroscope 2b and the third spectroscope 2c are respectively plated with a frequency doubling light high-reflection film with the reflectivity of more than 99.5%, and the two surfaces of the first spectroscope 2a, the second spectroscope 2b and the third spectroscope 2c are respectively plated with a fundamental frequency light antireflection film with the transmissivity of more than 99.5%. While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A frequency doubling device of a laser is characterized by comprising a first frequency doubling crystal (1), a first spectroscope (2 a), a second spectroscope (2 b), a third spectroscope (2 c), a beam reduction mirror group (3), a second frequency doubling crystal (4), a beam expanding mirror group (5), a first half-wave plate (6 a), a second half-wave plate (6 b) and a polarization beam splitter prism (7),
incident light (X1) enters the first light splitter (2 a) through the first frequency doubling crystal (1), is split into first transmitted light (X2) and first reflected light (X3) by the first light splitter (2 a),
the first transmitted light (X2) sequentially passes through the beam reducing mirror group (3), the second frequency doubling crystal (4), the beam expanding mirror group (5) and the first half wave plate (6 a), then enters the third beam splitter (2 c), is split into second transmitted light (X6) and second reflected light (X4) by the third beam splitter (2 c), and the second reflected light (X4) enters the polarized light splitting prism (7) and is reflected by the polarized light splitting prism (7) to form third reflected light;
the first reflected light (X3) enters the second beam splitter (2 b), and is reflected by the second beam splitter (2 b) to obtain fourth reflected light (X5), and the fourth reflected light (X5) passes through the second half-wave plate (6 b), enters the polarized light splitting prism (7), and is transmitted by the polarized light splitting prism (7) to form third transmitted light;
the third reflected light and the third transmitted light together form a light beam (X7).
2. The frequency doubling device of a laser according to claim 1, wherein the beam reduction lens group (3) comprises a first convex lens (3 a) and a first concave lens (3 b),
the first transmitted light (X2) passes through the first convex lens (2 a) and then passes through the first concave lens (3 b);
the main optical axis of the first convex lens (3 a) and the main optical axis of the first concave lens (3 b) are respectively positioned on the optical center extension line of the first transmission light (X2).
3. The frequency doubling means of the laser according to claim 1, wherein the set of beam expanders (5) comprises a second concave lens (5 a) and a second convex lens (5 b),
the first transmitted light (X2) passes through the second concave lens (5 a) and then passes through the second convex lens (5 b);
the main optical axis of the second concave lens (5 a) and the main optical axis of the second convex lens (5 b) are respectively positioned on the optical center extension line of the first transmission light (X2).
4. The frequency doubling apparatus for laser according to claim 1, wherein the first frequency doubling crystal (1) and/or the second frequency doubling crystal (4) is made of a crystal of one of potassium titanyl phosphate or lithium triborate or a mixture of two substances.
5. The frequency doubling apparatus for laser according to claim 1, wherein the first frequency doubling crystal (1) and the second frequency doubling crystal (4) are coated with a film for increasing the projection of fundamental light and frequency doubling light.
6. The frequency doubling apparatus according to claim 1, wherein the first frequency doubling crystal (1) and the second frequency doubling crystal (4) are made of the same material.
7. Frequency doubling means of a laser according to claim 1, characterized in that the cross-sectional area of the second frequency doubling crystal (4) is greater than or equal to half the cross-sectional area of the first frequency doubling crystal (1).
8. The frequency doubling device according to claim 1, wherein m = n is given as the reduction factor of the beam reducing mirror group (3) is m and the expansion factor of the beam expanding mirror group (5) is n.
9. The frequency doubling device according to claim 1, wherein the optical elements of the beam reducing lens set (3) and the optical elements of the beam expanding lens set (5) are coated with antireflection coatings for fundamental light and frequency doubling light.
10. The frequency doubling apparatus for laser according to claim 1, wherein the wavelengths of the first half-wave plate (6 a) and the second half-wave plate (6 b) are frequency doubling wavelengths of light;
preferably, antireflection films of fundamental frequency light and frequency doubling light are plated on the first half-wave plate (6 a) and the second half-wave plate (6 b);
preferably, the polarization beam splitter prism is plated with a frequency doubling light antireflection film;
preferably, the reflection surfaces of the first spectroscope (2 a), the second spectroscope (2 b) and the third spectroscope (2 c) are coated with a frequency doubling light high-reflection film with a reflectivity of more than 99.5%, and the two surfaces of the first spectroscope (2 a), the second spectroscope (2 b) and the third spectroscope (2 c) are coated with a fundamental frequency light antireflection film with a transmissivity of more than 99.5%.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108199253A (en) * | 2018-01-12 | 2018-06-22 | 北京工业大学 | The device and method of efficient frequency multiplication |
| CN113687290A (en) * | 2021-10-27 | 2021-11-23 | 山西大学 | Calibration device and method for weak field of Hall magnetometer based on spin noise spectrum |
| CN115693374A (en) * | 2022-12-30 | 2023-02-03 | 北京东方锐镭科技有限公司 | Laser frequency doubling device |
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| CN207474912U (en) * | 2017-08-24 | 2018-06-08 | 南京先进激光技术研究院 | The frequency doubling device of laser |
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| CN108199253A (en) * | 2018-01-12 | 2018-06-22 | 北京工业大学 | The device and method of efficient frequency multiplication |
| CN113687290A (en) * | 2021-10-27 | 2021-11-23 | 山西大学 | Calibration device and method for weak field of Hall magnetometer based on spin noise spectrum |
| CN115693374A (en) * | 2022-12-30 | 2023-02-03 | 北京东方锐镭科技有限公司 | Laser frequency doubling device |
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