CN109239947A - A kind of device and method obtaining hollow beam based on thermo-optic effect - Google Patents
A kind of device and method obtaining hollow beam based on thermo-optic effect Download PDFInfo
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- CN109239947A CN109239947A CN201811144496.4A CN201811144496A CN109239947A CN 109239947 A CN109239947 A CN 109239947A CN 201811144496 A CN201811144496 A CN 201811144496A CN 109239947 A CN109239947 A CN 109239947A
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/0147—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on thermo-optic effects
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
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Abstract
The present invention discloses a kind of device that hollow beam is obtained based on thermo-optic effect, the generation device of generation device and exploring laser light beam including pump laser beam, it is characterized in that, further including condenser lens, the first half-wave plate, the first polarization splitting prism, the cuvette equipped with alcohol solution, the second half-wave plate, the second polarization splitting prism and imaging device；Pump laser beam successively passes through condenser lens, the first half-wave plate and the first polarization splitting prism and focuses on cuvette；Exploring laser light Shu Yici enters imaging device by the second half-wave plate, the second polarization splitting prism, cuvette and the first polarization splitting prism.The invention also discloses the methods that above-mentioned apparatus obtains hollow beam.Pump laser beam makes the refractive index of alcohol solution that nonlinear change occur in the present invention, after the exploring laser light beam conllinear with pumping laser beam reversal passes through alcohol solution, additional phase shift is generated in outgoing endface, far field light intensity is redistributed, generates the hollow beam being made of Center Dark Spot and concentric circles.
Description
Technical field
The invention belongs to nonlinear optics application fields, and in particular to a kind of dress that hollow beam is obtained based on thermo-optic effect
It sets and method.
Background technique
Hollow beam refer to that central light strength in the propagation direction is extremely low or be zero annular beam.Hollow beam is unique
Light distribution has it in fields such as optics imprison, optical wrench, optical catheter and the super-resolution micro-imagings of microcosmic particle
Very important application value.Currently, the method that hollow beam can be obtained mainly have transverse mode back-and-forth method, geometrical optics approach,
Identification with Method of Optical Holography, hollow light nanofarads and position photo method etc., however these methods are related to optical system structure complexity, device price
Valuableness, and be difficult to control according to the Center Dark Spot size of these methods hollow beam obtained.
Summary of the invention
In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is that providing a kind of based on hot light
Effect obtains the device and method of hollow beam, generates exploring laser light beam by setting pump laser beam and alcohol solution attached
Add phase shift, and then change the far field transverse strength of exploring laser light beam, obtains the hollow beam being made of Center Dark Spot and concentric circles,
It may be implemented by the concentration of change alcohol solution and the power of pump laser beam to obtained hollow beam Center Dark Spot size
Control.
In order to solve the above technical problems, the technical solution adopted by the present invention is that: one kind obtaining hollow light based on thermo-optic effect
The device of beam, the generation device of generation device and exploring laser light beam including pump laser beam, it is characterised in that: further include focusing
Lens, the first half-wave plate, the first polarization splitting prism, the cuvette equipped with alcohol solution, the second half-wave plate, the second polarization spectro
Prism and imaging device；The pump laser beam successively passes through the condenser lens, the first half-wave plate and the first polarization spectro rib
Mirror focuses on the cuvette；The exploring laser light Shu Yici by the second half-wave plate, the second polarization splitting prism, cuvette and
Enter imaging device after first polarization splitting prism；Focus on the pump laser beam of cuvette and the detection by the cuvette
Laser beam reversal is conllinear；The pump laser beam and exploring laser light Shu Junwei Gaussian beam；The wavelength of pump laser beam is in alcohol
At the absorbing wavelength of class solution.
Above-mentioned a kind of device that hollow beam is obtained based on thermo-optic effect, it is characterised in that: focus on the pump of cuvette
Pu laser beam is horizontal polarization light；Exploring laser light beam into cuvette is orthogonal polarized light.
Above-mentioned a kind of device that hollow beam is obtained based on thermo-optic effect, it is characterised in that: the pump laser beam
Generation device is the laser for generating pump laser beam；The generation device of the exploring laser light beam is to generate swashing for exploring laser light beam
Light device.
Above-mentioned a kind of device that hollow beam is obtained based on thermo-optic effect, it is characterised in that: the pump laser beam
Generation device includes the laser being set in turn in same optical path, third half-wave plate and third polarization splitting prism, through institute
The light beam for stating third polarization splitting prism is pump laser beam；
The generation device of the exploring laser light beam includes first anti-on the reflected light path of third polarization splitting prism
Mirror is penetrated, and the second reflecting mirror on the reflected light path of the first reflecting mirror, the light beam of the second reflecting mirror reflection is exploring laser light
Beam.
Above-mentioned a kind of device that hollow beam is obtained based on thermo-optic effect, it is characterised in that: the imaging device includes
CCD camera or CMOS camera.
Above-mentioned a kind of device that hollow beam is obtained based on thermo-optic effect, it is characterised in that: the alcohol solution includes
Methanol solution, ethanol solution, propanol solution or butanol solution.
In addition, the present invention also provides a kind of methods for obtaining hollow beam using above-mentioned device, which is characterized in that including
Following steps:
Step 1: being focused after pump laser beam is passed sequentially through condenser lens, the first half-wave plate, the first polarization splitting prism
In the cuvette equipped with alcohol solution；
Step 2: partially by the second half-wave plate, the second polarization splitting prism, cuvette and first by exploring laser light Shu Yici
Enter imaging device after vibration Amici prism；
Step 3: the power of adjustment pump laser beam makes occur apparent Center Dark Spot and concentric loop figure on imaging device
Sample；
Step 4: the size for the Center Dark Spot that set-up procedure three obtains.
Above-mentioned method, which is characterized in that the pump laser beam that the first polarization splitting prism is penetrated in step 1 is level
Polarised light.
Above-mentioned method, which is characterized in that the exploring laser light beam reflected in step 2 through second polarization splitting prism
For orthogonal polarized light.
Above-mentioned method, which is characterized in that adjust pump laser beam by adjusting the angle of the first half-wave plate in step 3
Power.
Above-mentioned method, which is characterized in that molten by adjusting the power of pump laser beam and/or change alcohols in step 4
The concentration of liquid adjusts Center Dark Spot size.
Compared with the prior art, the present invention has the following advantages:
1, the present invention is based on thermo-optic effects, obtain hollow beam by setting pump laser beam and alcohol solution.Alcohols
Solution absorbs the energy production temperature gradient of pump laser beam, and the refractive index generation for generating the alcohol solution of temperature gradient is non-linear
Variation, exploring laser light beam is conllinear with pumping laser beam reversal, and the alcohol of nonlinear change occurs by the refractive index for exploring laser light beam
After class solution, additional phase shift is generated in the outgoing endface of alcohol solution, the light intensity in its far field is redistributed, generates by center
The hollow beam of blackening and concentric circles composition.
2, the present invention may be implemented by the concentration of change alcohol solution and the power of pump laser beam to obtained hollow
The control of beam center blackening size.
3, analytical equipment structure of the invention is simple, easy to operate, and design is rationally, at low cost easy to spread.
With reference to the accompanying drawings and examples, technical scheme of the present invention will be described in further detail.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the device that hollow beam is obtained based on thermo-optic effect of the embodiment of the present invention 1.
Fig. 2 is the structural schematic diagram of the device that hollow beam is obtained based on thermo-optic effect of the embodiment of the present invention 2.
Fig. 3 is that the power of pump laser beam in the embodiment of the present invention 3 is 50mW；The volume ratio of ethyl alcohol and deionized water is 7:
The hot spot figure of hollow beam obtained when 3.
Fig. 4 is that the power of pump laser beam in the embodiment of the present invention 3 is 100mW；The volume ratio of ethyl alcohol and deionized water is
The hot spot figure of hollow beam obtained when 7:3.
Fig. 5 is that the power of pump laser beam in the embodiment of the present invention 3 is 150mW；The volume ratio of ethyl alcohol and deionized water is
The hot spot figure of hollow beam obtained when 7:3.
Fig. 6 is that the power of pump laser beam in the embodiment of the present invention 3 is 200mW；The volume ratio of ethyl alcohol and deionized water is
The hot spot figure of hollow beam obtained when 1:4.
Fig. 7 is that the power of pump laser beam in the embodiment of the present invention 3 is 200mW；The volume ratio of ethyl alcohol and deionized water is
The hot spot figure of hollow beam obtained when 3:7.
Fig. 8 is that the power of pump laser beam in the embodiment of the present invention 3 is 200mW；The volume ratio of ethyl alcohol and deionized water is
The hot spot figure of hollow beam obtained when 1:1.5.
Description of symbols:
1-first laser device；2-second lasers；3-condenser lenses；
4-the first half-wave plate；5-the first polarization splitting prism；6-cuvettes；
7-the second polarization splitting prism；8-the second half-wave plate；9-imaging devices；
10-lasers；11-third half-wave plates；12-third polarization splitting prisms；
13-the first reflecting mirror；14-the second reflecting mirror.
Specific embodiment
Embodiment 1
Such as Fig. 1, the device of the present embodiment, the generation dress of generation device and exploring laser light beam 2 including pump laser beam 1
It sets, further includes condenser lens 3, the first half-wave plate 4, the first polarization splitting prism 5, the cuvette 6 equipped with alcohol solution, the second half
Wave plate 8, the second polarization splitting prism 7 and imaging device 9；The pump laser beam 1 successively passes through the condenser lens 3, first
Half-wave plate 4 and the first polarization splitting prism 5 focus on the cuvette 6；The exploring laser light beam 2 successively passes through the second half-wave plate
8, enter imaging device 9 after the second polarization splitting prism 7, cuvette 6 and the first polarization splitting prism 5；Focus on cuvette 6
Pump laser beam 1 and the exploring laser light beam 2 for passing through the cuvette 6 are reversed conllinear；The focal length of the condenser lens 3 is 200mm；
The reversed conllinear propagation side to focus on the pump laser beam and the exploring laser light beam by the cuvette 6 of cuvette 6
To on the contrary and collinearly to propagate；The pump laser beam 1 and exploring laser light beam 2 are Gaussian beam；The wavelength of pump laser beam 1
At absorbing wavelength in alcohol solution.
It is horizontal polarization light through the pump laser beam 1 for focusing on cuvette 6 after first polarization splitting prism 5；Into
The exploring laser light beam 2 for entering cuvette 6 is orthogonal polarized light.
The generation device of the pump laser beam 1 is the laser for generating pump laser beam；The production of the exploring laser light beam 2
Generating apparatus is the laser for generating exploring laser light beam；The generation device of pump laser beam 1 includes that the annular titanium of continuously adjustable is precious
Stone laser or external cavity semiconductor laser；The generation device of exploring laser light beam 2 includes the annular Ti:Sapphire laser of continuously adjustable
Laser or external cavity semiconductor laser；In the present embodiment, the generation device of pump laser beam 1 is the annular of continuously adjustable
Ti sapphire laser, it is also possible to external cavity semiconductor laser replacement；The generation device of exploring laser light beam 2 is external cavity type semiconductor
Laser, it is also possible to which the annular ti sapphire laser of continuously adjustable is replaced.
Imaging device 9 is CCD camera, it is also possible to CMOS camera substitution.
The alcohol solution includes methanol solution, ethanol solution, propanol solution or butanol solution.
Embodiment 2
Such as Fig. 2, the generation device of generation device and exploring laser light beam 2 including pump laser beam 1, further includes condenser lens
3, the first half-wave plate 4, the first polarization splitting prism 5, the cuvette 6 equipped with alcohol solution, the second half-wave plate 8, second polarization point
Light prism 7 and imaging device 9；The pump laser beam 1 is successively by the condenser lens 3, the first half-wave plate 4 and the first polarization
Amici prism 5 focuses on the cuvette 6；The exploring laser light beam 2 successively passes through the second half-wave plate 8, the second polarization spectro rib
Enter imaging device 9 after mirror 7, cuvette 6 and the first polarization splitting prism 5；Focus on the pump laser beam 1 and warp of cuvette 6
The exploring laser light beam 2 for crossing the cuvette 6 is reversed conllinear；The focal length of the condenser lens 3 is 200mm；It is described to be reversely collinearly
It is opposite with by the direction of propagation of exploring laser light beam of the cuvette 6 and be conllinear to focus on the pump laser beam of cuvette 6
It propagates；The pump laser beam 1 and exploring laser light beam 2 are Gaussian beam；The wavelength of pump laser beam 1 is in alcohol solution
At absorbing wavelength.
It is horizontal polarization light through the pump laser beam 1 for focusing on cuvette 6 after first polarization splitting prism 5；Into
The exploring laser light beam 2 for entering cuvette 6 is orthogonal polarized light.
The generation device of the pump laser beam 1 includes the laser 10 being set in turn in same optical path, third half-wave
Piece 11 and third polarization splitting prism 12, the light beam through the third polarization splitting prism 12 are pump laser beam 1；
The generation device of the exploring laser light beam 2 includes first on the reflected light path of third polarization splitting prism 12
Reflecting mirror 13, and the second reflecting mirror 14 on the reflected light path of the first reflecting mirror 13, the light beam of the second reflecting mirror 14 reflection
For exploring laser light beam 2；
Between third half-wave plate 11 and condenser lens 3, the second half-wave plate 8 is located at the third polarization splitting prism 12
Between second reflecting mirror 14 and the second polarization splitting prism 7；Institute is entered through the light beam of the third polarization splitting prism 12
Condenser lens 3 is stated, the laser beam reflected through the third polarization splitting prism 12 is incident on first reflecting mirror 13, through described
The light beam of first reflecting mirror 13 reflection is incident on the second reflecting mirror 14, is incident on the second half-wave plate after the reflection of the second reflecting mirror 14
8。
Laser 10 includes the annular ti sapphire laser or external cavity semiconductor laser of continuously adjustable, the present embodiment
In, laser 10 is the annular ti sapphire laser of continuously adjustable, it is also possible to external cavity semiconductor laser substitution.
The imaging device 9 is CCD camera, it is also possible to CMOS camera substitution.
The alcohol solution includes methanol solution, ethanol solution, propanol solution or butanol solution.
Embodiment 3
The method for obtaining hollow beam using the device of embodiment 1, specific steps include:
Step 1: a branch of pump laser beam 1 is obtained from the annular ti sapphire laser of continuously adjustable, by pumping laser
Beam 1 is incident on the first polarization splitting prism 5 after passing sequentially through condenser lens 3 and the first half-wave plate 4, through first polarization point
The pump laser beam 1 of light prism 5 focuses in the cuvette 6 equipped with alcohol solution；The pumping focused through the condenser lens 3 swashs
Light beam 1 is the Gaussian beam that waist spot size is 70 μm, and the pump laser beam 1 through the first polarization splitting prism 5 is horizontal polarization
Light；In the present embodiment, alcohol solution is ethanol solution, and the volume ratio of ethyl alcohol and deionized water is 7:3 in ethanol solution；This step
The a branch of pump laser beam 1 obtained from external cavity semiconductor laser can also be used；
Step 2: obtain a branch of exploring laser light beam 2 from external cavity semiconductor laser, by exploring laser light beam 2 by the
Two half-wave plates 8 are incident on the second polarization splitting prism 7, through the second polarization splitting prism 7 reflection after be incident on cuvette 6, from than
It is reflected into imaging device 9 through the first polarization splitting prism 5 after the outgoing of color ware 6, debugs exploring laser light beam 2 and pump laser beam 1
Optical path make the pump laser beam 1 that cuvette 6 is focused in the exploring laser light beam 2 for being incident on the cuvette 6 and step 1
The direction of propagation is opposite and propagates to be conllinear；Exploring laser light beam 2 through the reflection of the second polarization splitting prism 7 is orthogonal polarized light；This
The a branch of exploring laser light beam 2 obtained from the annular ti sapphire laser of continuously adjustable can also be used in step；
Step 3: the power of adjustment pump laser beam 1 makes occur apparent Center Dark Spot and concentric loop on imaging device 9
Pattern；The angle for adjusting the first half-wave plate 4 makes the power 50mW of the pump laser beam 1 entered in cuvette 6, into cuvette
The power of 6 pump laser beam 1 is measured by power meter；Occur apparent Center Dark Spot and concentric circles on imaging device 9
Ring pattern, hot spot obtained such as Fig. 3；
Step 4: the size for the Center Dark Spot that set-up procedure three obtains；Method are as follows: set-up procedure three enters cuvette 6
The power of pump laser beam 1 is 100mW, and the hot spot of hollow beam obtained is as shown in Figure 4；
The power that set-up procedure three enters the pump laser beam 1 of cuvette 6 is 150mW, the light of hollow beam obtained
Spot is as shown in Figure 5；
Change the concentration of ethanol solution, the volume ratio of ethyl alcohol and deionized water is 1:4 in ethanol solution, is entered in step 3
The power of the pump laser beam 1 of cuvette 6 is 200mW, and the hot spot of hollow beam obtained is as shown in Figure 6；
The volume ratio of ethyl alcohol and deionized water is 3:7 in ethanol solution, and the pump laser beam of cuvette 6 is entered in step 3
1 power is 200mW, and the hot spot of hollow beam obtained is as shown in Figure 7；
The volume ratio of ethyl alcohol and deionized water is 1:1.5 in ethanol solution, and the pumping laser of cuvette 6 is entered in step 3
The power of beam 1 is 200mW, and the hot spot of hollow beam obtained is as shown in Figure 8.
By Fig. 3-Fig. 5 it is found that when the volume ratio of ethyl alcohol in ethanol solution and deionized water is 7:3, with pumping laser
The Center Dark Spot size of the increase of 1 power of beam, obtained hollow beam increases.
By Fig. 6-Fig. 8 it is found that when the power of pump laser beam 1 is 200mW, as ethanol solution concentration increases, gained
The increase of the Center Dark Spot size of the hollow beam arrived.
After ethyl alcohol in the present embodiment replaces with methanol, propyl alcohol or butanol, hollow beam, Center Dark Spot ruler can be obtained
The changing rule of very little changing rule hollow beam Center Dark Spot size corresponding with ethanol solution is consistent.
Embodiment 4
The method for obtaining hollow beam using the device of embodiment 2, specific steps include:
Step 1: the laser beam that laser 10 issues successively is passed through third half-wave plate 11 and third polarization splitting prism
12, the light beam through third polarization splitting prism 12 is pump laser beam 1, and pump laser beam 1 is passed sequentially through 3 He of condenser lens
The first polarization splitting prism 5 is incident on after first half-wave plate 4, it is poly- through the pump laser beam 1 of first polarization splitting prism 5
Coke is in the cuvette 6 equipped with alcohol solution；It is 70 μm that the pump laser beam 1 focused through the condenser lens 3, which is waist spot size,
Gaussian beam, through the first polarization splitting prism 5 pump laser beam 1 be horizontal polarization light；In the present embodiment, alcohol solution
For ethanol solution, the volume ratio of ethyl alcohol and deionized water is 7:3 in ethanol solution；Laser 10 is the annular titanium of continuously adjustable
Sapphire laser, it is also possible to external cavity semiconductor laser substitution；
Step 2: the laser beam reflected through third polarization splitting prism 12 described in step 1 is incident on first reflecting mirror
13, it is incident on the second reflecting mirror 14 after the first reflecting mirror 13 changes direction, the laser beam being emitted from the second reflecting mirror 14 is to visit
Laser beam 2 is surveyed, exploring laser light beam 2 is incident on the second polarization splitting prism 7 by the second half-wave plate 8, through the second polarization spectro
Prism 7 is incident on cuvette 6 after reflecting, and is reflected into imaging device 9 through the first polarization splitting prism 5 after the outgoing of cuvette 6,
The optical path of debugging exploring laser light beam 2 and pump laser beam 1 makes to be incident in exploring laser light beam 2 and the step 1 of the cuvette 6
It focuses on the direction of propagation of the pump laser beam 1 of cuvette 6 on the contrary and is propagated to be conllinear；It is reflected through the second polarization splitting prism 7
Exploring laser light beam 2 be orthogonal polarized light；
Step 3: the power of adjustment pump laser beam 1 makes occur apparent Center Dark Spot and concentric loop on imaging device 9
Pattern；The angle for adjusting the first half-wave plate 4 makes the power 50mW of the pump laser beam 1 entered in cuvette 6, into cuvette
The power of 6 pump laser beam 1 is measured by power meter；Occur apparent Center Dark Spot and concentric circles on imaging device 9
Ring pattern；
Step 4: the size for the Center Dark Spot that set-up procedure three obtains.
In the present embodiment, there is hollow beam on imaging device 9；When the ratio of ethyl alcohol in ethanol solution and deionized water is true
Periodically, with the increase of 1 power of pump laser beam, the Center Dark Spot size of obtained hollow beam increases；Work as pumping laser
When the power of beam 1 determines, as ethanol solution concentration increases, the Center Dark Spot size of obtained hollow beam increases.
After ethyl alcohol in the present embodiment replaces with methanol, propyl alcohol or butanol, hollow beam, Center Dark Spot ruler can be obtained
The changing rule of very little changing rule hollow beam Center Dark Spot size corresponding with ethanol solution is consistent.
The principle of present invention acquisition hollow beam are as follows:
When a branch of pump laser beam passes through alcohol solution, a temperature ladder is formed after the energy of alkanol molecule absorption laser
Degree, so as to cause the variation of alcohol refractive index.Wherein hot nonlinear viscoelastic piles n2It can indicate are as follows:
Wherein, dn/dT is the coefficient that refractive index varies with temperature, K-1；α is the absorption coefficient of alcohol solution, cm-1；
ωpFor the radius of laser beam, mm；κ is the coefficient of heat conduction of alcohol solution, W/mK.Therefore total refractive index n can be indicated are as follows:
N=n0+n2I (2)
Wherein, according to Kerr effect, total refractive index n is related with light intensity, n0It is a constant for linear refractive index；I=I1+
I2For total laser intensity, I1And I2It respectively represents pump light and detects the laser power of light, unit is W/mm2.Because of pumping
The power of laser beam is much larger than the power of exploring laser light beam, it is possible to obtain n=n0+n2I1.When exploring laser light beam is by same
Additional phase shift can be generated when alcohol solution sample.If waist spot position of the pump laser beam 1 after condenser lens 3 is that coordinate is former
Point；The direction of propagation of the exploring laser light beam in the cuvette 6 equipped with alcohol solution is z-axis；If exploring laser light beam incidence cuvette
When end face be incident end face, be emitted cuvette when end face be outgoing end face, then z0 be incident end face position.Its additional phase
It movesIt can indicate are as follows:
Wherein, k0For wave vector；L is the length equipped with alcohol solution cuvette, mm；I1(ρ, z) is the light intensity of pump laser beam
Distribution；ω10For the waist radius of pump laser beam, mm；ω1pIt (z) is the radius of the pump laser beam at different location, mm；ρ
For radial coordinate.After considering nonlinear phase shift, exploring laser light beam can be obtained according to Fresnel-Kirchhoff diffraction formula
Far field construction light distribution:
Wherein, i is imaginary unit；λ is the wavelength of exploring laser light beam, nm；R (l) is that exploring laser light beam is emitted in cuvette
The wave-front curvature radius of endface, mm；θ andThe angular coordinate for respectively indicating far field construction angle and being emitted end face；D goes out for cuvette
Penetrate the distance between end face and receiving screen, mm；E2(0, l) the photoelectricity field strength of endface is emitted in cuvette for exploring laser light beam
Degree.
Due to the nonlinear phase shift of exploring laser light beamWith pump laser beam light intensity I1(ρ, z) is related, i.e. detection swashs
The far-field intensity distribution of light beam is related with pump laser beam light intensity；By formula (1) and (3) it is found that exploring laser light beam it is non-linear
Phase shiftIt is proportional to hot nonlinear viscoelastic piles n2, it is proportional to the absorption coefficient of alcohol solution, therefore, the present invention is logical
The concentration of the light intensity or alcohol solution of crossing change pump laser beam obtains the controllable hollow beam of Center Dark Spot size.
The above is only presently preferred embodiments of the present invention, is not intended to limit the invention in any way, it is all according to the present invention
Technical spirit any simple modification to the above embodiments, change and equivalent structural changes, still fall within skill of the present invention
In the protection scope of art scheme.
Claims (10)
1. a kind of device for obtaining hollow beam based on thermo-optic effect, generation device and detection including pump laser beam (1) swash
The generation device of light beam (2), it is characterised in that: further include condenser lens (3), the first half-wave plate (4), the first polarization splitting prism
(5), the cuvette equipped with alcohol solution (6), the second half-wave plate (8), the second polarization splitting prism (7) and imaging device (9)；Institute
Pump laser beam (1) is stated successively to focus by the condenser lens (3), the first half-wave plate (4) and the first polarization splitting prism (5)
To the cuvette (6)；The exploring laser light beam (2) successively passes through the second half-wave plate (8), the second polarization splitting prism (7), ratio
Color ware (6) and the first polarization splitting prism (5) enter imaging device (9) afterwards；Focus on the pump laser beam (1) of cuvette (6)
It is reversed conllinear with the exploring laser light beam (2) by the cuvette (6)；The pump laser beam (1) and exploring laser light beam (2) are equal
For Gaussian beam；The wavelength of pump laser beam (1) is at the absorbing wavelength of alcohol solution.
2. a kind of device for obtaining hollow beam based on thermo-optic effect described in accordance with the claim 1, it is characterised in that: focus on
The pump laser beam (1) of cuvette (6) is horizontal polarization light；Exploring laser light beam (2) into cuvette (6) is vertical polarization
Light.
3. a kind of device for obtaining hollow beam based on thermo-optic effect described in accordance with the claim 1, it is characterised in that: the pump
The generation device of Pu laser beam (1) is the laser for generating pump laser beam；The generation device of the exploring laser light beam (2) is to produce
The laser of raw exploring laser light beam.
4. a kind of device for obtaining hollow beam based on thermo-optic effect described in accordance with the claim 1, it is characterised in that: the pump
The generation device of Pu laser beam (1) includes the laser (10) being set in turn in same optical path, third half-wave plate (11) and
Three polarization splitting prisms (12), the light beam through the third polarization splitting prism (12) are pump laser beam (1)；
The generation device of the exploring laser light beam (2) includes first on the reflected light path of third polarization splitting prism (12)
Reflecting mirror (13), and the second reflecting mirror (14) being located on the reflected light path of the first reflecting mirror (13), the second reflecting mirror (14) are anti-
The light beam penetrated is exploring laser light beam (2).
5. it is described in accordance with the claim 1 it is a kind of based on thermo-optic effect obtain hollow beam device, it is characterised in that: it is described at
As device (9) include CCD camera or CMOS camera.
6. a kind of device for obtaining hollow beam based on thermo-optic effect described in accordance with the claim 1, it is characterised in that: the alcohol
Class solution includes methanol solution, ethanol solution, propanol solution or butanol solution.
7. a kind of method of the device acquisition hollow beam using as described in claim 1,3 or 4, which is characterized in that including with
Lower step:
Step 1: pump laser beam (1) is passed sequentially through condenser lens (3), the first half-wave plate (4), the first polarization splitting prism
(5) it is focused on after in the cuvette (6) equipped with alcohol solution；
Step 2: exploring laser light beam (2) is successively passed through the second half-wave plate (8), the second polarization splitting prism (7), cuvette (6)
Enter imaging device (9) afterwards with the first polarization splitting prism (5)；
Step 3: the power of adjustment pump laser beam makes apparent Center Dark Spot and concentric loop figure occur on imaging device (9)
Sample；
Step 4: the size for the Center Dark Spot that set-up procedure three obtains.
8. the method according to the description of claim 7 is characterized in that penetrating the pump of the first polarization splitting prism (5) in step 1
Pu laser beam (1) is horizontal polarization light；The exploring laser light beam (2) reflected in step 2 through second polarization splitting prism (7)
For orthogonal polarized light.
9. the method according to the description of claim 7 is characterized in that passing through the angle of adjusting the first half-wave plate (4) in step 3
Adjust pumping laser beam power.
10. the method according to the description of claim 7 is characterized in that in step 4 by adjusting the power of pump laser beam and/
Or change the concentration adjustment Center Dark Spot size of alcohol solution.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811144496.4A CN109239947A (en) | 2018-09-29 | 2018-09-29 | A kind of device and method obtaining hollow beam based on thermo-optic effect |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111239997A (en) * | 2020-03-20 | 2020-06-05 | 西北大学 | Rapid focusing dark field imaging device and method based on cross phase modulation |
| CN117293627A (en) * | 2023-11-27 | 2023-12-26 | 四川中久大光科技有限公司 | Miniaturized device for integrated dynamic monitoring of direction and power and application method thereof |
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| CN108319028A (en) * | 2018-01-12 | 2018-07-24 | 西北大学 | A kind of optical tweezer method of operating and device adjusted based on hollow smooth size |
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| CN111239997A (en) * | 2020-03-20 | 2020-06-05 | 西北大学 | Rapid focusing dark field imaging device and method based on cross phase modulation |
| CN117293627A (en) * | 2023-11-27 | 2023-12-26 | 四川中久大光科技有限公司 | Miniaturized device for integrated dynamic monitoring of direction and power and application method thereof |
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