CN106249329A - A kind of establishing method of the prism for separating mixed wavelengths laser - Google Patents
A kind of establishing method of the prism for separating mixed wavelengths laser Download PDFInfo
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- CN106249329A CN106249329A CN201610705877.XA CN201610705877A CN106249329A CN 106249329 A CN106249329 A CN 106249329A CN 201610705877 A CN201610705877 A CN 201610705877A CN 106249329 A CN106249329 A CN 106249329A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/04—Prisms
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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
- G02B27/0012—Optical design, e.g. procedures, algorithms, optimisation routines
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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
- G02B27/1006—Beam splitting or combining systems for splitting or combining different wavelengths
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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
- G02B27/12—Beam splitting or combining systems operating by refraction only
- G02B27/126—The splitting element being a prism or prismatic array, including systems based on total internal reflection
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- Optics & Photonics (AREA)
- Optical Elements Other Than Lenses (AREA)
Abstract
The invention discloses the establishing method of a kind of prism for separating mixed wavelengths laser, including: the three of prism optical surfaces are referred to as first surface, second surface and the 3rd surface the most successively, and the angle between first surface and second surface is, incident illumination is refracted into prism at first surface, and incident illumination includes a light and b light: a light second surface occurs total reflection and goes out system in the 3rd surface refraction；There is refraction and reflection at second surface in b light, the light wherein reflected directly reflects from second surface, and the light of reflection penetrates after the 3rd surface refraction from prism.By the way, the establishing method of the prism for separating mixed wavelengths laser of the present invention, the laser that multi-wavelength mixes the most effectively is separated by the prism that can use setting, and change the relative intensity between the light of different wave length, disturbed by non-targeted light when reducing follow-up study or utilize monochromatic light.
Description
Technical field
The present invention relates to light-splitting device field, particularly relate to the setting of a kind of prism for separating mixed wavelengths laser
Method.
Background technology
In optical system, it is often necessary to multi-wavelength hybrid laser is separated, or incite somebody to action to obtain monochromatic light
The light of one or more wavelength in polychromatic light is separated.
Particularly frequency multiplication or and frequency laser system in, non-linear conversion generate short wavelength laser power be often much smaller than
Fundamental frequency long wavelength laser, it is therefore desirable to be effectively separated with high power basic frequency laser by frequency multiplication or with frequency generation laser.
Traditional dispersing prism, there is dispersion phenomenon through same media in the light only with different wave length, thus
Being separated by the light of different wave length, after the light to different wave length separates under normal circumstances, the light of different wave length is from the same table of prism
Face outgoing, compared with incident illumination, the emergent light relative intensity change of different wave length is little, and this will make follow-up study or utilize monochrome
Light time is by the relatively strong jamming of non-targeted light.
Summary of the invention
The technical problem that present invention mainly solves is to provide the setting side of a kind of prism for separating mixed wavelengths laser
Method, the most effectively separates the laser that multi-wavelength mixes, and changes the relative intensity between the light of different wave length.
For solving above-mentioned technical problem, the technical scheme that the present invention uses is: provide one to be used for separating mixed recharge
The establishing method of the prism of long laser, including: the three of prism optical surfaces are referred to as the most successively first surface, second surface
With the 3rd surface, the angle between first surface and second surface is, incident illumination is refracted into prism at first surface, incident
Light includes a light and b light: a light second surface occurs total reflection and goes out system in the 3rd surface refraction；B light is sent out at second surface
Raw refraction and reflection, the light wherein reflected directly reflects from second surface, the light of reflection after the 3rd surface refraction from prism
Middle injection；
The relation of the light of different wave length refractive index in media as well and wavelength follows Cauchy's law:
Wherein, λ is lambda1-wavelength, and a, b, c are the constants relevant with prism material；
There is to follow during refraction the law of refraction of light on first surface, second surface and the 3rd these three surface, surface in light:
WhereinIt is the refractive index of incidence side,Be light in outgoing side's refractive index,It is angle of incidence,It it is refraction angle；
Light is when there is reflection in three surfaces, it then follows the reflection law of light, i.e. angle of incidence are equal to angle of reflection；
From geometrical relationship, a light is represented by the angle of incidence of second surface:
WhereinIt is a light refractive index in the prism,Represent the aerial refractive index of a light；
From geometrical relationship, b light is represented by the angle of incidence of second surface:
WhereinIt is b light refractive index in the prism,Represent the aerial refractive index of b light；
Making a light, at second surface, full transmitting can occur, b light does not occur the condition of total reflection to be at second surface:
In conjunction with、Expression formula, can obtain making a light be totally reflected at second surface, b light can not be sent out at second surface
When life is launched entirely, the first surface of prism and the angle of second surfaceWith incident illumination at the angle of incidence of first surfacePass
The condition that system should meet is:
In like manner, by controlling second surface and the angle on the 3rd surface, and then the light shooting angle from the 3rd surface is controlled, in like manner
Carry out the laser of multi-wavelength's mixing spatially the most separately.
In a preferred embodiment of the present invention, described first surface, second surface and the 3rd surface are plane.
In a preferred embodiment of the present invention, the refractive index of described a light is more than the refractive index of b light.
The invention has the beneficial effects as follows: the setting side of a kind of prism for separating mixed wavelengths laser that the present invention points out
Method, it is possible to use the prism set the most effectively to be separated by the laser that multi-wavelength mixes, and change different wave length
Relative intensity between light, is disturbed by non-targeted light when reducing follow-up study or utilize monochromatic light.
Accompanying drawing explanation
For the technical scheme being illustrated more clearly that in the embodiment of the present invention, in embodiment being described below required for make
Accompanying drawing be briefly described, it should be apparent that, below describe in accompanying drawing be only some embodiments of the present invention, for
From the point of view of those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to obtain other according to these accompanying drawings
Accompanying drawing, wherein:
Fig. 1 is the structural representation of establishing method one preferred embodiment of a kind of prism for separating mixed wavelengths laser of the present invention
Figure；
Fig. 2 is that the structure of another preferred embodiment of establishing method of a kind of prism for separating mixed wavelengths laser of the present invention is shown
It is intended to；
Fig. 3 is that the structure of the establishing method another embodiment of a kind of prism for separating mixed wavelengths laser of the present invention is shown
It is intended to.
Detailed description of the invention
Technical scheme in the embodiment of the present invention will be clearly and completely described below, it is clear that described enforcement
Example is only a part of embodiment of the present invention rather than whole embodiments.Based on the embodiment in the present invention, this area is common
All other embodiments that technical staff is obtained under not making creative work premise, broadly fall into the model of present invention protection
Enclose.
Referring to Fig. 1 to Fig. 3, the embodiment of the present invention includes:
Shown in Fig. 1, the establishing method of a kind of prism for separating mixed wavelengths laser, including: by the three of prism optics tables
Face is referred to as respectively first surface, second surface and the 3rd surface the most successively, be smooth plane, first surface and second surface it
Between angle be, the angle between second surface and the 3rd surface is γ, and the angle between first surface and the 3rd surface is β.
Incident illumination is refracted into prism at first surface, and incident illumination includes a light and b light, and the refractive index of a light is more than b light
Refractive index, a light second surface occurs total reflection also to go out system in the 3rd surface refraction, b light second surface occur refraction and
Reflection, the light wherein reflected directly reflects from second surface, and the light of reflection penetrates after the 3rd surface refraction from prism.
The relation of the light of different wave length refractive index in media as well and wavelength follows Cauchy's law:
Wherein, λ is lambda1-wavelength, and a, b, c are the constants relevant with prism material；
There is to follow during refraction the law of refraction of light on first surface, second surface and the 3rd these three surface, surface in light:
WhereinIt is the refractive index of incidence side,Be light in outgoing side's refractive index,It is angle of incidence,It it is refraction angle；
Light is when there is reflection in three surfaces, it then follows the reflection law of light, i.e. angle of incidence are equal to angle of reflection；
From geometrical relationship, a light is represented by the angle of incidence of second surface:
WhereinIt is a light refractive index in the prism,Represent the aerial refractive index of a light；
From geometrical relationship, b light is represented by the angle of incidence of second surface:
WhereinIt is b light refractive index in the prism,Represent the aerial refractive index of b light；
Making a light, at second surface, full transmitting can occur, b light does not occur the condition of total reflection to be at second surface:
In conjunction with、Expression formula, can obtain making a light be totally reflected at second surface, b light can not be sent out at second surface
When life is launched entirely, the first surface of prism and the angle of second surfaceWith incident illumination at the angle of incidence of first surfaceRelation
The condition that should meet is:
In like manner, by controlling second surface and the angle on the 3rd surface, and then the light shooting angle from the 3rd surface is controlled, in like manner
Carry out the laser of multi-wavelength's mixing spatially the most separately.
Embodiment 1
In the device of a kind of Trace Hg Concentration Testing based on optical fiber-coupled laser frequency doubling technology, in order to obtain the absorption at hydrargyrum
Wavelength 253.7nm laser near peak, by the application of fiber coupling technique, injects BBO by the laser that two wavelength are 507.4nm
After crystal, the laser comprising wavelength 507.4nm and wavelength are the laser of 253.7nm by emergent light, and its medium wavelength is 253.7nm's
Laser will be used for the detection to Trace Hg.This technology has evaded the demand to ultraviolet laser, be substantially reduced technical difficulty and
The cost of equipment, but in order to reduce the impact of the laser of 507.4nm, need to be separated by the light of different wave length, by right
The application of the present invention, can well solve this problem.
As in figure 2 it is shown, the dispersion that the prism that the light comprising two kinds of wavelength of outgoing from BBO is injected the present invention is constituted
In system, this prism makes with quartz glass for raw material, the light of different wave length refractive index in media as well and the pass of wavelength
It is to follow Cauchy's law:
λ is lambda1-wavelength, a, b, c is the constant relevant with prism material.For the prism manufactured by quartz glass, a=
1.443, b=4238, c=10.92, then the light of two kinds of different wave lengths refractive index in the prism is respectively as follows:
=1.4591 =1.5084
Light and reflects generation reflection at first surface.During refraction, the propagation of light meets the law of refraction；
WhereinIt is the refractive index of incidence side,Be light in outgoing side's refractive index,It is angle of incidence,It it is refraction angle.
When known polarization light injects quartz glass in by air, the reflection p-component of light and s component can flow reflectance
For:
The reflectance that can flow of reflection light is represented by:
WhereinIt is angle of incidence,It it is refraction angle.When<Time,It is an almost unchanged less value, in order to ensure
From system, the light intensity loss of the ultraviolet light of outgoing is less, and therefore the angle of incidence of incident illumination should controlWithin.
From geometrical relationship, the light of wavelength 253.7nm is represented by the angle of incidence of second surface:
From geometrical relationship, the light of wavelength 507.4nm is represented by the angle of incidence of second surface:
Making 507.4nm light not be totally reflected at second surface, 253.7nm light can occur the condition of full transmitting at second surface
It is:
Wherein=1.5084、=1.4591、==1, try to achieve:
Value the biggest time,Span the biggest, require again due to angular range to be less thanWithin, therefore actual behaviour
In work, the incident angle of incident illumination can be controlled, nowSpan be:
In view of the error problem in prism manufacturing process, take=。
Owing to the light of two kinds of wavelength is different at the angle of incidence of second surface, thus can when the 3rd surface refraction appears system
With separately, owing to light distance in the prism increases, from geometrical relationship, two-beam is two-beam when the outgoing on the 3rd surface
Distance will increase compared with directly from second surface outgoing, compared with directly from second surface injection lens, from the 3rd surface
The wavelength of outgoing is that the light intensity of the light of 507.4nm is more weak, it is simple to the utilization to the light of wavelength 253.7nm.
And then can reach to control ultraviolet light going out from the 3rd surface by controlling second surface and the angle on the 3rd surface
Firing angle degree.Such as, angle of incidence is controlled,=Time, by γ=Time, the ultraviolet light of wavelength 253.7nm from
3rd surface vertical exit.
As in figure 2 it is shown, be the schematic diagram of the prism structure design using above parameter designing to go out, wherein=、=,=,=。
Embodiment 2
In the measurement to mercury content, it is also possible to utilize and frequency technology obtains ultraviolet light.Wavelength is obtained with frequency technology utilizing
During the laser of 253.7nm, incide the wavelength of two-beam on BBO、Should meet relational expression:
The present embodiment usesBlue light andHONGGUANG.Therefore outgoing from BBO
Light include the light of three kinds of wavelength.In order to be separated by ultraviolet light, the light from BBO outgoing is injected the dispersion system of the present invention
In.This prism makes with quartz glass for raw material, and the relation of the light of different wave length refractive index in media as well and wavelength is followed
Cauchy's law:
λ is lambda1-wavelength, a, b, c is the constant relevant with prism material.For the prism manufactured by quartz glass, a=
1.443, b=4238, c=10.92, then the light of three kinds of different wave lengths refractive index in the prism is respectively as follows:
At first surface by generation reflection and refraction.During refraction, the propagation of light meets the law of refraction；
WhereinIt is the refractive index of incidence side,Be light in outgoing side's refractive index,It is angle of incidence,It it is refraction angle.
Light reflects the reflectance that can flow of light and is represented by when first surface incidence:
When<Time,It is an almost unchanged less value, in order to ensure the light intensity of the ultraviolet light of outgoing from system
Losing less, therefore the angle of incidence of incident illumination should controlWithin.
Can occur when light is injected optically thinner medium by optically denser medium total reflection condition be:
The light of wavelength 253.7nm, 405nm, 679.1nm second surface angle of incidence respectively:
The light of wavelength 405nm and 679.1nm is not totally reflected at second surface, and the light of wavelength 253.7nm is at the second table simultaneously
Face can occur total reflection condition be;
When incident illumination takes at the angle of incidence of first surfaceTime, meet the prism first surface of condition and the folder of second surface
The span at angle is:
Consider the error in operation and prism manufacturing process, can be by apex angle α value。
And then can reach to control ultraviolet light going out from the 3rd surface by controlling second surface and the angle on the 3rd surface
Firing angle degree.Such as, angle of incidence is controlled,=Time, by γ=Time, ultraviolet light is vertical from the 3rd surface
Outgoing.
As it is shown on figure 3, be the prism structure design diagram using above parameter designing to go out, wherein=、
=,=,=、、。
By the angle obtained, producing the prism of respective shapes, instruct the production of prism, the prism of special angle will be many
The laser planting specific wavelength mixing the most effectively separates, and changes the relative intensity between the light of different wave length.
The foregoing is only embodiments of the invention, not thereby limit the scope of the claims of the present invention, every utilize this
Equivalent structure or equivalence flow process that bright description is made convert, or are directly or indirectly used in other relevant technology neck
Territory, is the most in like manner included in the scope of patent protection of the present invention.
Claims (3)
1. for separating an establishing method for the prism of mixed wavelengths laser, for the setting of prism, it is characterised in that bag
Include:
The three of prism optical surfaces are referred to as the most successively first surface, second surface and the 3rd surface, first surface and the
Angle between two surfaces is, incident illumination is refracted into prism at first surface, and incident illumination includes a light and b light: a light second
There is total reflection and go out system in the 3rd surface refraction in surface；Refraction and reflection, the light wherein reflected is there is in b light at second surface
Directly reflecting from second surface, the light of reflection penetrates after the 3rd surface refraction from prism；
The relation of the light of different wave length refractive index in media as well and wavelength follows Cauchy's law:
Wherein, λ is lambda1-wavelength, and a, b, c are the constants relevant with prism material；
There is to follow during refraction the law of refraction of light on first surface, second surface and the 3rd these three surface, surface in light:
WhereinIt is the refractive index of incidence side,Be light in outgoing side's refractive index,It is angle of incidence,It it is refraction angle；
Light is when there is reflection in three surfaces, it then follows the reflection law of light, i.e. angle of incidence are equal to angle of reflection；
From geometrical relationship, a light is represented by the angle of incidence of second surface:
WhereinIt is a light refractive index in the prism,Represent the aerial refractive index of a light；
From geometrical relationship, b light is represented by the angle of incidence of second surface:
WhereinIt is b light refractive index in the prism,Represent the aerial refractive index of b light；
Making a light, at second surface, full transmitting can occur, b light does not occur the condition of total reflection to be at second surface:
In conjunction with、Expression formula, can obtain making a light be totally reflected at second surface, b light can not occur at second surface
When entirely launching, the first surface of prism and the angle of second surfaceWith incident illumination at the angle of incidence of first surfaceRelation should
The condition met is:
In like manner, by controlling second surface and the angle on the 3rd surface, and then the light shooting angle from the 3rd surface is controlled, in like manner
Carry out the laser of multi-wavelength's mixing spatially the most separately.
The establishing method of the prism for separating mixed wavelengths laser the most according to claim 1, it is characterised in that described
First surface, second surface and the 3rd surface are plane.
The establishing method of the prism for separating mixed wavelengths laser the most according to claim 1, it is characterised in that described
The refractive index of a light is more than the refractive index of b light.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610705877.XA CN106249329B (en) | 2016-08-23 | 2016-08-23 | A kind of setting method for detaching the prism of mixed wavelengths laser |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610705877.XA CN106249329B (en) | 2016-08-23 | 2016-08-23 | A kind of setting method for detaching the prism of mixed wavelengths laser |
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| CN106249329A true CN106249329A (en) | 2016-12-21 |
| CN106249329B CN106249329B (en) | 2018-10-19 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110459945A (en) * | 2018-05-07 | 2019-11-15 | 发那科株式会社 | Laser oscillator |
| CN110618480A (en) * | 2019-09-26 | 2019-12-27 | 上海科乃特激光科技有限公司 | 90-degree deflection optical element, and use method and application thereof |
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| US20060061864A1 (en) * | 2004-09-22 | 2006-03-23 | Aronstein David L | Increased yield of cubic crystalline optical elements by crystal orientation |
| CN101046555A (en) * | 2006-03-29 | 2007-10-03 | 曲阜师范大学激光研究所 | Polarized light beam splitting double reflection method and polarized light beam splitting prism |
| CN102576153A (en) * | 2009-08-17 | 2012-07-11 | 3M创新有限公司 | Dual total internal reflection polarizing beamsplitter |
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|---|---|---|---|---|
| CN85101872A (en) * | 1985-04-01 | 1986-10-01 | 株式会社日立制作所 | Lens optical and optical information processing apparatus |
| DE20205081U1 (en) * | 2002-03-30 | 2002-06-06 | Leica Microsystems | Microscope with a device for determining the light output of an illuminating light beam |
| US20060061864A1 (en) * | 2004-09-22 | 2006-03-23 | Aronstein David L | Increased yield of cubic crystalline optical elements by crystal orientation |
| CN101046555A (en) * | 2006-03-29 | 2007-10-03 | 曲阜师范大学激光研究所 | Polarized light beam splitting double reflection method and polarized light beam splitting prism |
| CN102576153A (en) * | 2009-08-17 | 2012-07-11 | 3M创新有限公司 | Dual total internal reflection polarizing beamsplitter |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110459945A (en) * | 2018-05-07 | 2019-11-15 | 发那科株式会社 | Laser oscillator |
| CN110459945B (en) * | 2018-05-07 | 2021-04-02 | 发那科株式会社 | Laser oscillator |
| CN110618480A (en) * | 2019-09-26 | 2019-12-27 | 上海科乃特激光科技有限公司 | 90-degree deflection optical element, and use method and application thereof |
| CN110618480B (en) * | 2019-09-26 | 2021-04-13 | 上海科乃特激光科技有限公司 | 90-degree deflection optical element, and use method and application thereof |
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