CN110673351A - Polarization-maintaining thin film laser beam splitting system capable of setting different splitting ratios - Google Patents
Polarization-maintaining thin film laser beam splitting system capable of setting different splitting ratios Download PDFInfo
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- CN110673351A CN110673351A CN201911053635.7A CN201911053635A CN110673351A CN 110673351 A CN110673351 A CN 110673351A CN 201911053635 A CN201911053635 A CN 201911053635A CN 110673351 A CN110673351 A CN 110673351A
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- 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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Abstract
The invention discloses a polarization-maintaining thin film laser beam splitting system capable of setting different splitting ratios, which comprises beam splitters with different splitting ratios and 1 total reflector, wherein the number of the beam splitters is the number of splitting paths reduced by 1. The total reflection mirror sequentially comprises a total reflection film and a transparent glass substrate. The spectroscope sequentially comprises an incident surface light splitting film, a transparent glass substrate and an emergent surface antireflection film. The polarization-maintaining film laser beam splitting system provided by the invention can set any splitting ratio according to requirements, and the emergent light intensity is basically the same and the original polarization characteristic is kept.
Description
Technical Field
The invention belongs to the technical field of laser, and particularly relates to a polarization-maintaining thin film laser beam splitting system capable of setting different splitting ratios.
Background
With the popularization of laser products and application technologies, more and more optical devices adopt laser as a transmittance detection light source of a medium, and in order to reduce cost, a beam of laser emitted by one laser is generally divided into multiple paths to be output, so that multiple paths of parallel detection are realized, and the purpose of reducing detection cost is achieved. The traditional laser light splitting modes include a grating mode, a waveguide mode and a prism array mode, wherein the light splitting proportion of the first two light splitting modes is higher in allocation cost and larger in loss, and the latter light splitting mode occupies a large space. As disclosed in chinese patent application No. CN201110295248.1, a polarization beam splitter and a method for forming the same includes: a transparent substrate; the polarization grating is positioned on the transparent substrate and comprises a plurality of light transmission parts and light non-transmission parts which are arranged in parallel at intervals; a transparent layer on the polarization grating. The intensity of transmitted light and reflected light of the incident light of the polarization light splitting device after passing through the polarization light splitting device is basically the same and is close to 50% of the intensity of the incident light, and the imaging effect of the stereoscopic projection optical system can be improved. For example, chinese patent publication No. CN206573742U discloses a transmission type isolation beam splitter, which includes a single-fiber collimator, a multi-fiber collimator, an isolator, a shell, and a waveguide beam splitting chip, wherein the single-fiber collimator, the isolator, the waveguide beam splitting chip, and the multi-fiber collimator are sequentially disposed, and are packaged and fixed by the shell. The waveguide light splitting chip not only has the light splitting function, but also has the characteristic of small volume, so that the volume of the light splitter can be reduced. When a single beam of light is emitted from the single-fiber collimator and passes through the isolator, the single beam of light is uniformly divided into multiple paths of light by the waveguide light-dividing chip, and any path of light in the multiple paths of light does not influence other light paths.
The functions of the novel laser beam splitter are needed to meet the requirements of more experiments and production, more beam splitting proportion is needed, the loss of laser is reduced, the size is reduced, and the like.
Disclosure of Invention
The invention aims to provide a polarization-maintaining film light splitting system capable of setting different splitting ratios, which can set any splitting ratio according to requirements, has basically the same emergent light intensity and keeps the original polarization characteristic.
In order to achieve the purpose, the invention adopts the following technical scheme:
the polarization-maintaining thin film laser beam splitting system comprises beam splitters and 1 total reflector, wherein the beam splitters and the total reflectors are different in splitting ratio, and the number of the beam splitters is reduced by 1.
The total reflection mirror sequentially comprises a total reflection film and a transparent glass substrate.
According to the polarization maintaining film laser beam splitting system provided by the invention, the spectroscope can be set with any splitting ratio according to actual requirements, so that different splitting ratios can be more flexibly realized.
The spectroscope sequentially comprises an incident surface light splitting film, a transparent glass substrate and an emergent surface antireflection film.
Preferably, the material of the total reflection film is a composite film composed of titanium dioxide layers and silicon dioxide layers with different thicknesses, and the reflectivity of the total reflection film is more than 99.9%.
In the invention, the film system design of the incidence plane spectral film is designed according to the spectral ratio; the exit surface antireflection film in the spectroscope is used for reducing the light intensity loss of the exit light, reducing the interference of ghost images, achieving the purpose that the light intensity of each laser beam is basically the same after light splitting, and keeping the original polarization characteristic of the laser.
Preferably, the incident surface light splitting film and the exit surface antireflection film are made of composite films composed of titanium dioxide layers and silicon dioxide layers with different thicknesses, and the transmittance of the exit surface antireflection film is more than 99.5%.
Preferably, the exit surface antireflection film is deposited on the transparent glass substrate by a magnetron sputtering process, electron beam evaporation or vapor deposition.
The polarization maintaining film laser light splitting system is a light splitting and splitting system, the light splitting and splitting system comprises 3 light splitting mirrors and 1 total reflection mirror, and the transmissivity/reflectivity of the incident surface light splitting film in the 3 light splitting mirrors is 3/1, 2/1 and 1/1 respectively.
The polarization maintaining film light splitting system is an one-to-eight light splitting system, and the one-to-eight light splitting system comprises a one-to-two light splitting system and two one-to-four light splitting systems; the two light splitting systems comprise a light splitting mirror with the transmittance/reflectivity of 1: 1; the optical film comprises 3 spectroscopes and 1 total reflector, and the transmissivity/reflectivity of the incident surface light splitting film in the 3 spectroscopes is 3/1, 2/1 and 1/1 respectively.
Preferably, the incident laser light is at a 45 ° angle to the spectroscopic laser light, so that the light is distributed orthogonally. When a special light path is designed, the incident angle is not unique. The incident laser is in a horizontal polarization state, and the laser split by the polarization-maintaining thin-film laser splitting system is still in the horizontal polarization state. The light intensity of each beam is basically the same after the laser is split.
In the polarization-maintaining thin film laser beam splitting system provided by the invention, the incident surface light splitting thin film is subjected to film system design according to the required light splitting ratio, the antireflection thin film on the emergent surface of the light splitting thin film is deposited by the magnetron sputtering technology, the electron beam evaporation or vapor deposition technology and the like, and the antireflection thin film is deposited by the film system design and the technologies, so that the reflection of emergent light is reduced, and the loss of laser is reduced.
Compared with the prior art, the polarization-maintaining film light splitting system provided by the invention can divide a laser beam into a plurality of laser beams with basically the same light intensity and keep the polarization characteristics of the laser beams unchanged; compared with other light splitting systems, the invention has the advantages of more compact structure, small volume and the like; the light splitting system provided by the invention can perform flexible light splitting ratio, such as one-to-three, one-to-five and the like.
Drawings
FIG. 1 is a diagram showing a structure of a beam splitter in a polarization maintaining thin film beam splitting system.
FIG. 2 is a diagram showing the structure of a total reflection mirror in a polarization maintaining thin film spectroscopic system.
Fig. 3 is an optical configuration diagram of a light splitting system in embodiment 1.
FIG. 4 shows the reflectance and transmittance spectra of the entrance face dichroic film in different beamsplitters of example 1.
FIG. 5 is a spectrum diagram of an exit surface antireflection film and a total reflection film in example 1.
Fig. 6 is a schematic structural diagram of an eighth-to-eighth spectroscopy system in embodiment 2.
Fig. 7 is a diagram of a practical application of a light splitting system in laser fiber light splitting in embodiment 1.
Detailed Description
Example 1
Taking a laser polarization maintaining thin film light splitting system with a four-in-one function of a multichannel rubidium atom magnetometer as an example, the laser wavelength is 795 nm.
As shown in fig. 3, a 795nm light splitting system (also called as a splitter) generates a laser beam with a wavelength of 795nm by a laser, all polarization states are s-polarized, a collimated laser beam is obtained by a collimating mirror system, the laser beam is in the same line with the splitter and a one-side holophote, and the laser beam and the splitter form a 45 degree angle.
The light splitting and splitting system provided by the embodiment comprises 3 light splitting mirrors and 1 total reflection mirror, wherein the light splitting mirrors sequentially comprise an incident surface light splitting film, a transparent glass substrate and an exit surface antireflection film, and the total reflection mirror sequentially comprises a total reflection film and a transparent glass substrate. The structures of the spectroscope and the total reflection mirror are shown in fig. 1 and fig. 2, respectively.
The transmittance/reflectance of the incident surface spectral films in the 3 spectroscopes are 3/1, 2/1 and 1/1 respectively, the film system design is shown in table 1, the transmittance spectrum is shown in fig. 4, and the design indexes can be kept in the range of about 50nm near the working wavelength 795nm, so that errors caused by dispersion and assembly precision are avoided.
The exit surface antireflection film can prevent stray light caused by reflection from the back surface of the slide, and as shown in fig. 5, can realize a transmittance of 99.5% or more at a wavelength around 795nm, and the film system is designed as shown in table 2.
Among them, the film system design of the total reflection film in the total reflection mirror is as shown in table 2, and as shown in fig. 5, the reflectance can be achieved to be 99.9% or more in the vicinity of the operating wavelength 795 nm.
After the collimated laser passes through a light splitting and splitting system provided by the embodiment, 4 beams of laser with the same light intensity and the same polarization characteristic as the incident laser can be obtained.
TABLE 1 film system design of incident plane spectral film
TABLE 2 film system design of antireflection film and total reflection film on exit surface
Example 2
The polarization maintaining film beam splitting system provided by the embodiment is shown in fig. 6: one beam of laser is divided into two by one two-in-two spectroscope, and the two sets of one-in-four laser beam splitting systems are connected, so that one beam of laser is divided into eight, the light intensity and the polarization characteristics are consistent, the structure is compact, and the size is small.
Application example 1
As shown in fig. 7, a polarization maintaining thin film spectrometer system of example 1 is provided: laser emits laser, and enters different optical fibers after passing through a light splitting system. The laser generates a laser beam, enters a polarization maintaining film light splitting system with four splitting points to obtain 4 beam splitting lasers with the same light intensity, and then enters different optical fibers through the coupling lens for transmission.
Claims (8)
1. The polarization-maintaining thin film laser beam splitting system capable of setting different splitting ratios is characterized by comprising beam splitters with different splitting ratios and 1 total reflector, wherein the number of the beam splitters is the number of splitting paths minus 1.
2. The polarization-maintaining thin film laser beam splitting system capable of setting different splitting ratios according to claim 1, wherein the total reflection mirror comprises a total reflection film and a transparent glass substrate in this order.
3. The polarization-maintaining thin-film laser beam splitting system capable of setting different splitting ratios according to claim 2, wherein the total reflection film is made of a composite film composed of titanium dioxide layers and silicon dioxide layers with different thicknesses, and the reflectivity of the total reflection film is more than 99.9%.
4. The polarization-maintaining thin film laser beam splitting system capable of setting different splitting ratios according to claim 1, wherein the beam splitter comprises an incident surface beam splitting thin film, a transparent glass substrate and an exit surface antireflection thin film in this order.
5. The polarization-maintaining thin film laser beam splitting system according to claim 4, wherein the incident surface reflection reducing thin film and the exit surface reflection reducing thin film are made of a composite film comprising titanium dioxide layers and silicon dioxide layers having different thicknesses, and the exit surface reflection reducing thin film has a transmittance of 99.5% or more.
6. The polarization-maintaining thin film laser beam splitting system capable of setting different splitting ratios according to claim 4, wherein the exit surface antireflection thin film is deposited on the transparent glass substrate by magnetron sputtering process, electron beam evaporation or vapor deposition.
7. The polarization maintaining thin film laser beam splitting system capable of setting different splitting ratios according to claim 4, wherein the polarization maintaining thin film laser beam splitting system is a splitting system, the splitting system comprises 3 beam splitters and 1 total reflection mirror, and the transmittance/reflectance of the incidence plane splitting thin film in the 3 beam splitters is 3/1, 2/1 and 1/1 respectively.
8. The polarization maintaining thin film laser beam splitting system capable of setting different splitting ratios according to claim 4, wherein the polarization maintaining thin film beam splitting system is an one-to-eight beam splitting system, and the one-to-eight beam splitting system comprises a one-to-two beam splitting system and two one-to-four beam splitting systems; the two light splitting systems comprise a light splitting mirror with the transmittance/reflectivity of 1: 1; the light splitting and splitting system comprises 3 light splitting mirrors and 1 total reflection mirror, and the transmissivity/reflectivity of the incident surface light splitting film in the 3 light splitting mirrors is 3/1, 2/1 and 1/1 respectively.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111239871A (en) * | 2020-03-31 | 2020-06-05 | 福建福特科光电股份有限公司 | Polarization maintaining film, total reflection polarization maintaining prism and method for realizing total reflection polarization maintaining |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102707345A (en) * | 2012-06-06 | 2012-10-03 | 中国科学院上海光学精密机械研究所 | Polarization-maintaining semi-transmissive semi-reflective mirror for 45-degree linearly polarized light |
| CN203871648U (en) * | 2014-05-09 | 2014-10-08 | 西安炬光科技有限公司 | High-power semiconductor laser beam expanding device |
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- 2019-10-31 CN CN201911053635.7A patent/CN110673351A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102707345A (en) * | 2012-06-06 | 2012-10-03 | 中国科学院上海光学精密机械研究所 | Polarization-maintaining semi-transmissive semi-reflective mirror for 45-degree linearly polarized light |
| CN203871648U (en) * | 2014-05-09 | 2014-10-08 | 西安炬光科技有限公司 | High-power semiconductor laser beam expanding device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111239871A (en) * | 2020-03-31 | 2020-06-05 | 福建福特科光电股份有限公司 | Polarization maintaining film, total reflection polarization maintaining prism and method for realizing total reflection polarization maintaining |
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