CN109839736A - A kind of broad band laser energy attenuator - Google Patents
A kind of broad band laser energy attenuator Download PDFInfo
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- CN109839736A CN109839736A CN201711212862.0A CN201711212862A CN109839736A CN 109839736 A CN109839736 A CN 109839736A CN 201711212862 A CN201711212862 A CN 201711212862A CN 109839736 A CN109839736 A CN 109839736A
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- glass window
- window
- rotation displacement
- electronic rotation
- broad band
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Abstract
The present invention relates to a kind of broad band laser energy attenuators, including an electronic rotation displacement platform, one piece of glass window, window mounting base and several pieces of Metal film reflector mirrors being fixed on mirror holder controlled by computer.Incident linearly polarized laser depends primarily on the incident angle that laser corresponds to window through the glass window for being fixed on electronic rotation displacement platform, reflectivity.Optical path height is lifted by two pieces of Metal film reflector mirrors at an angle of 90 after laser light window, it can also be by the way of optical path or so translation, it is reflected back window again along parallel direction, through certain energy of decaying later, exports attenuator via third block Metal film reflector mirror.The angulation change reflectivity of electronic rotation displacement platform is adjusted, transmitting twice window ensures that window angle change will not influence emitting light path while reducing transmitance.The present apparatus can carry out energy attenuation, transmitance is continuously adjustable, while having very high damage threshold using no coated glass window to the laser in very wide wave-length coverage.
Description
Technical field
The present invention relates to a kind of broad band laser energy attenuators, can be used for a variety of necks for needing to decay to laser energy
Domain is particularly suitable for the case where lambda1-wavelength changes in very wide wave-length coverage.
Background technique
There is the case where much needing damping capacity in the application of laser.It is currently used to continuously adjust swashing for transmitance
Light energy damped manner includes using neutral colour filter, 1/2 wave plate and polarizer combination etc..The neutral colour filter of special designing is saturating
It is continuously adjustable to cross rate, can use, but hot spot uniformity can be impacted, and entering in very wide wave-length coverage
It penetrates in the higher situation of laser power to be used for a long time and be easily damaged.1/2 wave plate and polarizer combination can be by rotating wave plates come real
Existing transmitance continuously adjusts, and disadvantage is that available wave-length coverage is narrow.
Summary of the invention
Technology of the invention solves the problems, such as: overcoming the deficiencies of the prior art and provide one kind can be used for wide wave-length coverage, transmission
The continuously adjustable high laser energy attenuator of damage threshold simultaneously of rate.
Technical solution of the invention: a kind of broad band laser energy attenuator, including the electricity controlled by computer 1
Move several pieces of Metal film reflector mirrors that 2, one pieces of swing offset platform glass window 3, one window mounting base 4, is fixed on mirror holder
5, in which:
Glass window 3 is fixed on electronic rotation displacement platform 2 by window mounting base 4, the rotation of electronic rotation displacement platform 2
Axis has a certain proportion of energy to be reflected, instead by 3 center of glass window, incident S polarized light through after glass window 3
The rate of penetrating depends primarily on the angle that incident light corresponds to window 3, changes incidence angle size by control electronic rotation displacement platform 2 and realizes
Adjusting to reflectivity；
It is fixed on two pieces of Metal film reflector mirrors 5 on mirror holder at an angle of 90, optical path will be lifted by the laser of glass window 3
Height or left and right translation, are reflected into glass window 3 along the direction parallel with incident light later, this passes through windowpane again
3 position of piece is different from the position that laser passes through glass window 3 for the first time, reflects later via third block Metal film reflector mirror 5 defeated
Out, the effect for passing twice through window in this manner is: 1. increase energy reflections further decrease transmitance；2. electronic
The rotation of swing offset platform remains unchanged emitting light path when adjusting window angle.
Attenuator is used for the energy attenuation of linearly polarized light, and S polarized light can directly pass through attenuator, and P-polarized light is in device
It needs that polarization direction is changed into S-polarization by a height mirror being made of two Metal film reflector mirrors 5 first before.
Glass window 3 depends on the angle and glass of glass window 3 and incident light to the reflectivity of incident ray polarized light
The refractive index of window 3, glass window 3 can use unlike material, including but not limited to vitreous silica, BK7.
Angle of regulation range between incident light and glass window 3 depends on the relative size of hot spot and glass window 3, false
If angular range is from 0 ° to 75 °, then laser is about 4% to 40% by the primary reflectivity changes range in window surface,
Assuming that the transmitance variation range that laser transmits twice window is about 85% to 13% in the case that window materials are not lost.
Window mounting base 4 is fixed on glass window 3 on electronic rotation displacement platform 2 by way of bottom clamping window.
Metal film reflector mirror 5, can be according to waveband selection golden film, silverskin or the aluminium film belonging to incident laser.
Electronic rotation displacement platform 2 uses closed-loop control, can be pin-pointed to correct angle according to the needs of transmitance.
The present invention has following beneficial effect:
The present invention can carry out effective attenuation to the light in very wide wave-length coverage, while have high excellent of damage threshold
Point.
Detailed description of the invention
Fig. 1 is composition schematic diagram of the invention；
Fig. 2 is reflection of the incident laser on interface, transmitted light path schematic diagram；
Fig. 3 is the height mirror intention for changing polarization direction；
In figure: 1, computer；2, electronic rotation displacement platform；3, glass window；4, window mounting base；5, Metal film reflector
Mirror.
Specific embodiment
The present invention will be described in detail with reference to the accompanying drawings and examples.
As shown in Figure 1, broad band laser energy attenuator includes an electronic rotation displacement platform 2, one controlled by computer 1
Block glass window 3, window mounting bases 4, several pieces of Metal film reflector mirrors 5 being fixed on mirror holder, in which:
Glass window 3 is fixed on electronic rotation displacement platform 2 by window mounting base 4, the rotation of electronic rotation displacement platform 2
Axis has a certain proportion of energy to be reflected, instead by 3 center of glass window, incident S polarized light through after glass window 3
3 refractive index of angle and glass window that rate depends on incident light and glass window 3 is penetrated, by controlling electronic rotation displacement platform 2
Change adjusting of the incident angle realization to reflectivity.
As shown in Fig. 2, polarization direction perpendicular to the plane of incidence (S-polarization) incident light interface reflectivity and incident angle
Relationship it is as follows:
In above formula, R is polarization direction perpendicular to reflectivity of the light at interface of the plane of incidence, θiIt is incidence angle, θtIt is transmitted light
With the angle of normal, θiAnd θtThere is following relationship:
N is glass window refractive index, in conjunction with above two formula, so that it may pass through incident angle θiList is calculated with refractive index n
The secondary reflectivity by glass window interface.
It is fixed on two pieces of Metal film reflector mirrors 5 on mirror holder at an angle of 90, optical path will be lifted by the laser of glass window 3
Height or left and right translation, are reflected into glass window 3 along the direction parallel with incident light later again, this time penetrate windowpane
3 position of piece is different from laser and penetrates 3 position of glass window for the first time, reflects later via third block Metal film reflector mirror (5) defeated
Out, the effect for transmitting twice window in this manner is: 1. increase energy reflection, in incident light and the isogonal feelings of window
Transmitance is further decreased under condition；2. emitting light path can be made to protect when electronic rotation displacement platform rotates and adjusts window angle
It holds constant.
Assuming that glass window 3 itself can ignore the absorption of laser, the transmitance for passing twice through glass window 3 is
T=(1-R)4
Attenuator is used for the energy attenuation of linearly polarized light, and S polarized light can directly pass through attenuator, and P-polarized light is in device
It needs polarization direction to be become S-polarization from the height mirror that two Metal film reflector mirrors 5 form by one first before.Embodiment party
Formula is as shown in figure 3, horizontal polarization light is in the reflecting mirror reflection of lower section first, later by top reflecting mirror secondary reflection again,
The polarization direction of emergent light switchs to vertical polarization.
Electronic rotation displacement platform 2 uses closed-loop control, can be pin-pointed to correct angle according to the needs of transmitance.
The content that description in the present invention is not described in detail belongs to the prior art well known to professional and technical personnel in the field.
The above embodiments merely illustrate the technical concept and features of the present invention, and its object is to allow person skilled in the art
Scholar cans understand the content of the present invention and implement it accordingly, and it is not intended to limit the scope of the present invention.It is all according to the present invention
Equivalent change or modification made by Spirit Essence, should be covered by the protection scope of the present invention.
Claims (7)
1. a kind of broad band laser energy attenuator, it is characterised in that: including the electronic rotation displacement controlled by computer (1)
Platform (2), one piece of glass window (3), a window mounting base (4), several pieces of Metal film reflector mirrors (5) being fixed on mirror holder,
Wherein:
Glass window (3) is fixed on electronic rotation displacement platform (2) by window mounting base (4), electronic rotation displacement platform (2)
Rotary shaft penetrates glass window (3), has a certain proportion of energy anti-by glass window (3) center, incident S polarized light
It penetrates, reflectivity depends primarily on the incidence angle that incident light corresponds to glass window (3), is changed by controlling electronic rotation displacement platform (2)
Variable incident angle degree realizes the adjusting to reflectivity；
It is fixed on two pieces of Metal film reflector mirrors (5) on mirror holder at an angle of 90, the laser of glass window (3) will be passed through and be lifted optical path
Height or left and right translation, are reflected into glass window (3) along the direction parallel with incident light again, this time penetrate glass window
(3) position penetrates glass window (3) position for the first time different from laser, reflects later via third block Metal film reflector mirror (5)
Output.
2. broad band laser energy attenuator according to claim 1, it is characterised in that: the attenuator is used for linearly polarized light
Energy attenuation, S polarized light can directly pass through attenuator, and P-polarized light is needed before device first by one by two gold
Polarization direction is changed into S-polarization by the height mirror for belonging to film reflecting mirror (5) composition.
3. broad band laser energy attenuator according to claim 1, it is characterised in that: the glass window (3) can adopt
With unlike material, including but not limited to vitreous silica, BK7, reflectivity depend on glass window (3) and incident light angle and
The refractive index of glass window (3) selects the glass window (3) of different materials according to wave-length coverage.
4. broad band laser energy attenuator according to claim 1, it is characterised in that: incident light and glass window (3) it
Between angle of regulation range depend on glass window (3) and hot spot relative size.
5. broad band laser energy attenuator according to claim 1, it is characterised in that: the window mounting base (4) passes through
The mode of bottom clamping window is fixed on glass window (3) on electronic rotation displacement platform (2).
6. broad band laser energy attenuator according to claim 1, it is characterised in that: the Metal film reflector mirror (5), it can
According to waveband selection golden film, silverskin or aluminium film belonging to incident laser.
7. broad band laser energy attenuator according to claim 1, it is characterised in that: the electronic rotation displacement platform
(2) closed-loop control is used.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711212862.0A CN109839736A (en) | 2017-11-28 | 2017-11-28 | A kind of broad band laser energy attenuator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711212862.0A CN109839736A (en) | 2017-11-28 | 2017-11-28 | A kind of broad band laser energy attenuator |
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| CN109839736A true CN109839736A (en) | 2019-06-04 |
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| CN201711212862.0A Pending CN109839736A (en) | 2017-11-28 | 2017-11-28 | A kind of broad band laser energy attenuator |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113359272A (en) * | 2021-05-14 | 2021-09-07 | 山东大学 | Adjustable optics climbing turns to device |
| CN114088200A (en) * | 2021-11-16 | 2022-02-25 | 西北核技术研究所 | Strong laser far-field power attenuation sampling device and method |
| CN114441032A (en) * | 2022-01-19 | 2022-05-06 | 西北核技术研究所 | High-energy laser power tracing transfer system and method based on wedge lens group cascade attenuation |
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| CN1564076A (en) * | 2004-04-06 | 2005-01-12 | 中国科学院上海光学精密机械研究所 | Laser attenuator |
| CN101446688A (en) * | 2008-12-15 | 2009-06-03 | 中国科学院上海技术物理研究所 | Depolarization method of optical system by utilizing metal plane mirror |
| CN102096186A (en) * | 2010-12-20 | 2011-06-15 | 无锡荣兴科技有限公司 | Continuous and adjustable type optical attenuator |
| CN102128611A (en) * | 2010-12-14 | 2011-07-20 | 长春理工大学 | Optical level compensator |
| CN102128619A (en) * | 2010-12-14 | 2011-07-20 | 长春理工大学 | Optical plumb compensator |
| CN105103389A (en) * | 2013-04-05 | 2015-11-25 | 株式会社伏沃 | Wavelength-tunable laser |
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2017
- 2017-11-28 CN CN201711212862.0A patent/CN109839736A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1564076A (en) * | 2004-04-06 | 2005-01-12 | 中国科学院上海光学精密机械研究所 | Laser attenuator |
| CN101446688A (en) * | 2008-12-15 | 2009-06-03 | 中国科学院上海技术物理研究所 | Depolarization method of optical system by utilizing metal plane mirror |
| CN102128611A (en) * | 2010-12-14 | 2011-07-20 | 长春理工大学 | Optical level compensator |
| CN102128619A (en) * | 2010-12-14 | 2011-07-20 | 长春理工大学 | Optical plumb compensator |
| CN102096186A (en) * | 2010-12-20 | 2011-06-15 | 无锡荣兴科技有限公司 | Continuous and adjustable type optical attenuator |
| CN105103389A (en) * | 2013-04-05 | 2015-11-25 | 株式会社伏沃 | Wavelength-tunable laser |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113359272A (en) * | 2021-05-14 | 2021-09-07 | 山东大学 | Adjustable optics climbing turns to device |
| CN113359272B (en) * | 2021-05-14 | 2023-03-14 | 山东大学 | Adjustable optics climbing turns to device |
| CN114088200A (en) * | 2021-11-16 | 2022-02-25 | 西北核技术研究所 | Strong laser far-field power attenuation sampling device and method |
| CN114088200B (en) * | 2021-11-16 | 2023-10-20 | 西北核技术研究所 | Strong laser far-field power attenuation sampling method |
| CN114441032A (en) * | 2022-01-19 | 2022-05-06 | 西北核技术研究所 | High-energy laser power tracing transfer system and method based on wedge lens group cascade attenuation |
| CN114441032B (en) * | 2022-01-19 | 2024-06-21 | 西北核技术研究所 | High-energy laser power traceability transmission system and method based on wedge lens group cascade attenuation |
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Application publication date: 20190604 |
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