CN207474912U - The frequency doubling device of laser - Google Patents
The frequency doubling device of laser Download PDFInfo
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- CN207474912U CN207474912U CN201721067954.XU CN201721067954U CN207474912U CN 207474912 U CN207474912 U CN 207474912U CN 201721067954 U CN201721067954 U CN 201721067954U CN 207474912 U CN207474912 U CN 207474912U
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Abstract
A kind of frequency doubling device of laser is disclosed, belongs to optical technical field.Wherein, incident light is incident to the first spectroscope by the first frequency-doubling crystal, is the first transmitted light and the first reflected light by the first spectroscope beam splitting.First transmitted light successively by shrink beam microscope group, the second frequency-doubling crystal, expand microscope group and the first half-wave plate after be incident to third spectroscope, it is the second transmitted light and the second reflected light by the beam splitting of third spectroscope, the second reflected light is incident to polarised light Amici prism and reflects to form third reflected light by polarised light Amici prism.First reflected light is incident to the second spectroscope, obtains the 4th reflected light after being reflected by the second spectroscope, the 4th reflected light is incident to polarised light Amici prism after the second half-wave plate and transmits to form third transmitted light by polarised light Amici prism.Light beam is collectively formed with third transmitted light in third reflected light.It can improve the conversion ratio during laser-doubled.
Description
Technical field
The present invention relates to optical technical field, more particularly to a kind of frequency doubling device of laser.
Background technology
Frequency conversion is a kind of effective technology for the application range for expanding superpower laser, it is using optical medium strong
Nonlinear optical effect under radiation field generates new frequency.Frequency multiplication is most widely used technology in nonlinear optics, generally
For it is desirable that obtain the higher transformation efficiency from fundamental frequency light to frequency doubled light.
Usually there are mainly two types of approach for the transformation efficiency of raising frequency multiplication process：(1) increase the peak power density of fundamental frequency light.
In the case of given pulsed laser energy and pulse width, the method for improving peak power density is to reduce the size of hot spot,
The shortcomings that this method be when hot spot reduce to a certain extent when laser peak power density be more than laser crystal end face plating
The damage threshold of film, leads to device failure；(2) increase frequency-doubling crystal length.With conversion base of the fundamental frequency light in frequency-doubling crystal
The peak power density of frequency light continuously decreases, and transformation efficiency declines.So when frequency-doubling crystal length increases to certain length again
Increase crystal length shg efficiency, which does not have, to be obviously improved.
Invention content
In view of this, the present invention provides a kind of frequency doubling device of laser, during can improving laser-doubled
Conversion ratio, thus more suitable for practicality.
In order to reach above-mentioned first purpose, the technical solution of the frequency doubling device of laser provided by the invention is as follows：
The frequency doubling device of laser provided by the invention include the first frequency-doubling crystal (1), the first spectroscope (2a), second point
Light microscopic (2b), shrink beam microscope group (3), the second frequency-doubling crystal (4), expands microscope group (5), the first half-wave plate at third spectroscope (2c)
(6a), the second half-wave plate (6b) and polarised light Amici prism (7),
Incident light (X1) is incident to first spectroscope (2a) by first frequency-doubling crystal (1), by described first
Spectroscope (2a) beam splitting be the first transmitted light (X2) and the first reflected light (X3),
First transmitted light (X2) passes through the shrink beam microscope group (3), the second frequency-doubling crystal (4), expands microscope group (5) successively
With the third spectroscope (2c) is incident to after the first half-wave plate (6a), by third spectroscope (2c) beam splitting for second transmission
Light (X6) and the second reflected light (X4), second reflected light (X4) are incident to the polarised light Amici prism (7) and described
Polarised light Amici prism (7) reflects to form third reflected light；
First reflected light (X3) is incident to second spectroscope (2b), is reflected by second spectroscope (2b)
After obtain the 4th reflected light (X5), the 4th reflected light (X5) be incident to after second half-wave plate (6b) it is described partially
Shake light Amici prism (7) and by the polarised light Amici prism (7) transmission form third transmitted light；
Light beam (X7) is collectively formed with the third transmitted light in the third reflected light.
The frequency doubling device of laser provided by the invention also can be used following technical measures and further realize.
Preferably, the shrink beam microscope group (3) includes the first convex lens (3a) and the first concavees lens (3b),
First transmitted light (X2) is first passed through after first convex lens (3a) using first concavees lens (3b)；
The primary optical axis of first convex lens (3a), the primary optical axis of first concavees lens (3b) are respectively at described first
On the optical center extended line of transmitted light (X2).
Preferably, the microscope group (5) that expands includes the second concavees lens (5a) and the second convex lens (5b),
First transmitted light (X2) is first passed through after second concavees lens (5a) using second convex lens (5b)；
The primary optical axis of second concavees lens (5a), the primary optical axis of second convex lens (5b) are respectively at described first
On the optical center extended line of transmitted light (X2).
Preferably, on first frequency-doubling crystal (1) and/or second frequency-doubling crystal (4) by potassium titanium oxide phosphate or
The crystal of mixture that the crystal or two kinds of substances that a kind of substance in three lithium borate of person is formed are formed is made.
Preferably, first frequency-doubling crystal (1) and second frequency-doubling crystal (4) are coated with fundamental frequency light and frequency doubled light
Increasing throw film.
Preferably, first frequency-doubling crystal (1) is identical with the material of second frequency-doubling crystal (4).
Preferably, the sectional area of second frequency-doubling crystal (4) is more than or equal to first frequency-doubling crystal (1)
The half of sectional area.
Preferably, setting the minification of the shrink beam microscope group (3) as m, the expansion multiple for expanding microscope group (5) is n,
Then m=n.
Preferably, the optical element of microscope group (5) is expanded described in forming the optical element of the shrink beam microscope group (3), forming
On be coated with the anti-reflection film of fundamental frequency light and frequency doubled light.
Preferably, first half-wave plate (6a), the wavelength of the second half-wave plate (6b) are frequency multiplication optical wavelength.
Preferably, the increasing of fundamental frequency light and frequency doubled light is coated on first half-wave plate (6a), the second half-wave plate (6b)
Permeable membrane.
Preferably, it is coated with frequency doubled light anti-reflection film on the polarised light Amici prism.
Preferably, first spectroscope (2a), the second spectroscope (2b), third spectroscope (2c) reflecting surface plate
There is reflectivity>99.5% frequency doubled light high-reflecting film, first spectroscope (2a), the second spectroscope (2b), third spectroscope
The two sides of (2c) is coated with transmitance>99.5% fundamental frequency light anti-reflection film.
The frequency doubling device of laser provided by the invention in application process, fundamental frequency light by first time frequency multiplication it is transformed after
The remaining energy of journey carries out frequency multiplication conversion again after shrink beam, the frequency doubled light that secondary conversion obtains after expanding with for the first time
It exports to improve shg efficiency after the frequency multiplication combiner that conversion process obtains.In addition, using traditional cavity external frequency multiplication scheme by light
50% can only be reached by learning the general shg efficiency of influence of device damage threshold value；And the frequency multiplication of laser provided by the invention is used to fill
Putting can be in the case where damaging optical device, for example, when the minification of shrink beam microscope group is 1.4 times, expands microscope group
Expansion multiple also be 1.4 times when, wherein, when first time frequency multiplication transformation efficiency reaches 50%, fundamental frequency during second of frequency multiplication
The peak power density of light reaches the level identical with first time frequency multiplication process.It can make in such second of frequency multiplication conversion process
The transformation efficiency of remaining fundamental frequency light reaches 50%, therefore, it is possible to cause at this time shg efficiency is made to reach 75%.Wherein, it is contracting
Beam ratio example and expand ratio be can be realized under 1.4 times of this parameters 75% shg efficiency, frequency multiplication is imitated during more than 1.4 frequency multiplication
For rate between 50~75%, it is more than damage threshold that the peak power density at second of frequency multiplication can be caused less than 1.4 frequencys multiplication.Also
It is to say, it is provided by the invention to swash in the case where selecting the minification of appropriate shrink beam microscope group, expanding the expansion multiple of microscope group
The frequency doubling device of light device can significantly increase electric light transformation efficiency, simultaneously, additionally it is possible to reduce system complexity.
Description of the drawings
By reading the detailed description of hereafter preferred embodiment, it is various other the advantages of and benefit it is common for this field
Technical staff will become clear.Attached drawing is only used for showing the purpose of preferred embodiment, and is not considered as to the present invention
Limitation.And throughout the drawings, the same reference numbers will be used to refer to the same parts.In the accompanying drawings：
Fig. 1 is the optical element and light path schematic diagram of the frequency doubling device of laser provided in an embodiment of the present invention.
Specific embodiment
The present invention is of the existing technology to solve the problems, such as, provides a kind of frequency doubling device of laser, can improve sharp
Conversion ratio during light device frequency multiplication, thus more suitable for practicality.
The technological means and effect taken further to illustrate the present invention to reach predetermined goal of the invention, below in conjunction with
Attached drawing and preferred embodiment, the frequency doubling device to the laser proposed according to the present invention, specific embodiment, structure, feature
And its effect, it is described in detail as after.In the following description, what different " embodiment " or " embodiment " referred to is not necessarily same
Embodiment.In addition, the feature, structure or feature in one or more embodiments can be combined by any suitable form.
The terms "and/or", only a kind of incidence relation for describing affiliated partner, expression may have three kinds of passes
System, for example, A and/or B, is specifically interpreted as：A and B can be included simultaneously, can be with individualism A, it can also individualism
B can have above-mentioned three kinds of any situations.
Referring to attached drawing 1, the frequency doubling device of laser provided in an embodiment of the present invention includes 1, first point of the first frequency-doubling crystal
Light microscopic 2a, the second spectroscope 2b, third spectroscope 2c, shrink beam microscope group 3, the second frequency-doubling crystal 4, microscope group 5, the first half-wave plate are expanded
6a, the second half-wave plate 6b and polarised light Amici prism 7.Incident light X1 is incident to the first spectroscope 2a by the first frequency-doubling crystal 1,
It is the first transmitted light X2 and the first reflected light X3 by the first spectroscope 2a beam splitting.First transmitted light X2 passes through shrink beam microscope group successively
3rd, the second frequency-doubling crystal 4, expand 5 and first half-wave plate 6a of microscope group after be incident to third spectroscope 2c, by third spectroscope 2c points
Beam is incident to polarised light Amici prism 7 for the second transmitted light X6 and the second reflected light X4, the second reflected light X4 and is divided by polarised light
Light prism 7 reflects to form third reflected light.First reflected light X3 is incident to the second spectroscope 2b, is reflected by the second spectroscope 2b
After obtain the 4th reflected light X5, the 4th reflected light X5 is incident to polarised light Amici prism 7 and inclined after the second half-wave plate 6b
The light Amici prism 7 that shakes transmission forms third transmitted light.Light beam X7 is collectively formed with third transmitted light in third reflected light.
The frequency doubling device of laser provided by the invention in application process, fundamental frequency light by first time frequency multiplication it is transformed after
The remaining energy of journey carries out frequency multiplication conversion again after shrink beam, the frequency doubled light that secondary conversion obtains after expanding with for the first time
It exports to improve shg efficiency after the frequency multiplication combiner that conversion process obtains.In addition, using traditional cavity external frequency multiplication scheme by light
50% can only be reached by learning the general shg efficiency of influence of device damage threshold value；And the frequency multiplication of laser provided by the invention is used to fill
Putting can be in the case where damaging optical device, when the minification of shrink beam microscope group is 1.4 times, expands the expansion multiple of microscope group
When being also 1.4 times, wherein, when first time frequency multiplication transformation efficiency reaches 50%, the peak work of fundamental frequency light during second of frequency multiplication
Rate density reaches the level identical with first time frequency multiplication process.It can make remaining fundamental frequency light in such second of frequency multiplication conversion process
Transformation efficiency reach 50%, therefore, it is possible to cause at this time shg efficiency is made to reach 75%.It is that is, appropriate in selection
Shrink beam microscope group minification, expand the expansion multiple of microscope group in the case of, the frequency doubling device of laser provided by the invention
Electric light transformation efficiency can be significantly increased, simultaneously, additionally it is possible to reduce system complexity.
Wherein, shrink beam microscope group 3 includes the first convex lens 3a and the first concavees lens 3b.It is convex that first transmitted light X2 first passes through first
Using the first concavees lens 3b after lens 3a.The primary optical axis of first convex lens 3a, the first concavees lens 3b primary optical axis be respectively at
On the optical center extended line of first transmitted light X2.Since convex lens and concavees lens have refraction action to light, according to light incidence
It, can be according to characteristic of the refraction index changing light along straightline propagation, in this case, only to the position of convex lens or concavees lens
Have when the primary optical axis of the first convex lens 3a, the primary optical axis of the first concavees lens 3b are respectively at the optical center extended line of the first transmitted light X2
When upper, it can ensure that the first transmitted light X2, still being capable of edge after the first convex lens 3a, the first concavees lens 3b is passed through successively
Straightline propagation.
Wherein, it expands microscope group 5 and includes the second concavees lens 5a and the second convex lens 5b.It is recessed that first transmitted light X2 first passes through second
Using the second convex lens 5b after lens 5a；The primary optical axis of second concavees lens 5a, the second convex lens 5b primary optical axis be respectively at
On the optical center extended line of first transmitted light X2.Since convex lens and concavees lens have refraction action to light, according to light incidence
It, can be according to characteristic of the refraction index changing light along straightline propagation, in this case, only to the position of convex lens or concavees lens
Have when the primary optical axis of the second concavees lens 5a, the primary optical axis of the second convex lens 5b are respectively at the optical center extended line of the first transmitted light X2
When upper, it can ensure that the first transmitted light X2, still being capable of edge after the second concavees lens 5a, the second convex lens 5b is passed through successively
Straightline propagation.
Wherein, by one in potassium titanium oxide phosphate or three lithium borates on the first frequency-doubling crystal 1 and/or the second frequency-doubling crystal 4
The crystal of mixture that the crystal or two kinds of substances that kind substance is formed are formed is made.Wherein,
Potassium titanium oxide phosphate (KTP) crystal be it is a kind of have excellent nonlinear optical property, obtained it is extensive attention and
The nonlinear optical crystal of application.Ktp crystal is positive photosensitiveness twin crystal, and transmission region is 350nm~4.5um, can be realized
1.064um neodymium ions laser and its all band laser freuqency doubling and frequency, the non-colinear position of optical parametric oscillation (generally use II class position
Match).Its nonlinear factor d31, d32, d33 are respectively 1.4,2.65 and 10.7pm/V, d33 are the 20 of KDP crystal d36
Yu Bei.Ktp crystal has higher optic damage threshold value, can be used for middle power laser frequency multiplication etc..Ktp crystal has good machinery
Property and physicochemical property, not soluble in water and organic solvent, deliquescence, about 1150 DEG C of fusing point do not have decomposed, the crystalline substance in fusing
Body also has very big temperature and angle tolerance.Ktp crystal has been widely used for scientific research, technology etc. as frequency converting material
Every field, especially as the best crystal of middle low power frequency multiplication.Frequency multiplier and photoparametric amplifier etc. made of the crystal
It has been applied to all solid state tunable laser source.
Three lithium borates (LiB3O5 is abbreviated as LBO) are the outer frequency-doubling crystal of outstanding high-power purple, have wide light transmission wave
Section, high damage threshold, big acceptance angle.Its main performance includes：Through wave band：0.165~3.2 μm, nonlinear factor：
D31=1.05Pm/V, laser damage threshold：25GW/cm2, frequency multiplication transformation efficiency：40~60% (1064nm → 532nm), application
Range：Solid laser system, particularly for high power Nd：Two frequencys multiplication of YAG, frequency tripling and optical parametric oscillation and amplification
Deng.
Wherein, the first frequency-doubling crystal 1 and the second frequency-doubling crystal 4 are coated with the anti-reflection film of fundamental frequency light and frequency doubled light.This
In the case of, light during by the first frequency-doubling crystal 1 and the second frequency-doubling crystal 4, light intensity loss due to the introducing of anti-reflection film,
It can be lowered, therefore, it is possible to which the light by the first frequency-doubling crystal 1 and the second frequency-doubling crystal 4 is enabled to realize guarantor as much as possible
It hands down in a direct line from the master and broadcasts.
Wherein, the first frequency-doubling crystal 1 is identical with the material of the second frequency-doubling crystal 4.
Wherein, the sectional area of the second frequency-doubling crystal 4 is more than or equal to the half of the sectional area of the first frequency-doubling crystal 1.
In this case, the sectional area of crystal can make light beam all by the way that the bigger price of sectional area of frequency-doubling crystal is higher.By
Facula area at the second frequency-doubling crystal 4 only has the half at the first frequency-doubling crystal 1, so only needing the second frequency-doubling crystal 4
The half that sectional area is more than or equal to the sectional area of the first frequency-doubling crystal 1 can just be such that light beam all passes through.The mesh done so
Be to reduce cost.
Wherein, if the minification of shrink beam microscope group 3 is m, the expansion multiple for expanding microscope group 5 is n, then m=n.It can be protected
The hot spot of card light beam X7 is evenly distributed.Wherein, if m ≠ n, the spot diameter of light beam X4 and light beam X5 is different, closes Shu Houhui
Change original spot energy distribution state, be unevenly distributed the hot spot of light beam X7.
Wherein, form the optical element of shrink beam microscope group 3, form be coated on the optical element for expanding microscope group 5 fundamental frequency light and
The anti-reflection film of frequency doubled light.
Wherein, the first half-wave plate 6a, the second half-wave plate 6b wavelength be frequency multiplication optical wavelength.In this case, herein two
The effect of a half-wave plate is to make to change by two beam frequency multiplication light polarization directions of half-wave plate, is existed so as to fulfill two beam frequency doubled lights
Conjunction beam output at polarised light Amici prism 7.Wherein light beam X5 becomes horizontal polarization light after half-wave plate 6b, by half-wave
Light beam X4 after piece 6a becomes orthogonal polarized light.Half-wave plate has not to be applied to using wave-length coverage, such as the laser of wavelength 1064nm
In the half-wave plate of 532nm.
Wherein, the anti-reflection film of fundamental frequency light and frequency doubled light is coated on the first half-wave plate 6a, the second half-wave plate 6b.So as to reduce
Light is in the light intensity loss after the first half-wave plate 6a, the second half-wave plate 6b.
Wherein, it is coated with frequency doubled light anti-reflection film on polarised light Amici prism.Passing through polarised light Amici prism so as to reduce light
Light intensity loss later.
Wherein, the first spectroscope 2a, the second spectroscope 2b, third spectroscope 2c reflecting surface be coated with reflectivity>
99.5% frequency doubled light high-reflecting film, the first spectroscope 2a, the second spectroscope 2b, third spectroscope 2c two sides be coated with transmitance
>99.5% fundamental frequency light anti-reflection film.Although preferred embodiments of the present invention have been described, but those skilled in the art once obtain
Cicada basic creative concept, then additional changes and modifications may be made to these embodiments.So appended claims are intended to
It is construed to include preferred embodiment and falls into all change and modification of the scope of the invention.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
God and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (12)
1. a kind of frequency doubling device of laser, which is characterized in that including the first frequency-doubling crystal (1), the first spectroscope (2a), second
Spectroscope (2b), shrink beam microscope group (3), the second frequency-doubling crystal (4), expands microscope group (5), the first half-wave plate at third spectroscope (2c)
(6a), the second half-wave plate (6b) and polarised light Amici prism (7),
Incident light (X1) is incident to first spectroscope (2a) by first frequency-doubling crystal (1), is divided by described first
Mirror (2a) beam splitting be the first transmitted light (X2) and the first reflected light (X3),
First transmitted light (X2) successively by the shrink beam microscope group (3), the second frequency-doubling crystal (4), expand microscope group (5) and the
The third spectroscope (2c) is incident to after half of wave plate (6a), is the second transmitted light by third spectroscope (2c) beam splitting
(X6) it is incident to the polarised light Amici prism (7) with the second reflected light (X4), second reflected light (X4) and by described inclined
The light Amici prism (7) that shakes reflects to form third reflected light；
First reflected light (X3) is incident to second spectroscope (2b), is obtained after being reflected by second spectroscope (2b)
4th reflected light (X5), the 4th reflected light (X5) are incident to the polarised light light splitting after second half-wave plate (6b)
Prism (7) simultaneously forms third transmitted light by the polarised light Amici prism (7) transmission；
Light beam (X7) is collectively formed with the third transmitted light in the third reflected light.
2. the frequency doubling device of laser according to claim 1, which is characterized in that the shrink beam microscope group (3) is including first
Convex lens (3a) and the first concavees lens (3b),
First transmitted light (X2) is first passed through after first convex lens (3a) using first concavees lens (3b)；
The primary optical axis of first convex lens (3a), the primary optical axis of first concavees lens (3b) are respectively at first transmission
On the optical center extended line of light (X2).
3. the frequency doubling device of laser according to claim 1, which is characterized in that the microscope group (5) that expands is including second
Concavees lens (5a) and the second convex lens (5b),
First transmitted light (X2) is first passed through after second concavees lens (5a) using second convex lens (5b)；
The primary optical axis of second concavees lens (5a), the primary optical axis of second convex lens (5b) are respectively at first transmission
On the optical center extended line of light (X2).
4. the frequency doubling device of laser according to claim 1, which is characterized in that first frequency-doubling crystal (1) and institute
State the increasing throwing film that the second frequency-doubling crystal (4) is coated with fundamental frequency light and frequency doubled light.
5. the frequency doubling device of laser according to claim 1, which is characterized in that first frequency-doubling crystal (1) and institute
The material for stating the second frequency-doubling crystal (4) is identical.
6. the frequency doubling device of laser according to claim 1, which is characterized in that second frequency-doubling crystal (4) is cut
Area is more than or equal to the half of the sectional area of first frequency-doubling crystal (1).
7. the frequency doubling device of laser according to claim 1, which is characterized in that set the diminution of the shrink beam microscope group (3)
Multiple is m, and the expansion multiple for expanding microscope group (5) is n, then m=n.
8. the frequency doubling device of laser according to claim 1, which is characterized in that form the light of the shrink beam microscope group (3)
The anti-reflection film that fundamental frequency light and frequency doubled light are coated on the optical element of microscope group (5) is expanded described in element, composition.
9. the frequency doubling device of laser according to claim 1, which is characterized in that first half-wave plate (6a), second
The wavelength of half-wave plate (6b) is frequency multiplication optical wavelength.
10. the frequency doubling device of laser according to claim 1, which is characterized in that first half-wave plate (6a), second
The anti-reflection film of fundamental frequency light and frequency doubled light is coated on half-wave plate (6b).
11. the frequency doubling device of laser according to claim 1, which is characterized in that plated on the polarised light Amici prism
There is frequency doubled light anti-reflection film.
12. the frequency doubling device of laser according to claim 1, which is characterized in that first spectroscope (2a), second
Spectroscope (2b), third spectroscope (2c) reflecting surface be coated with reflectivity>99.5% frequency doubled light high-reflecting film, described first point
Light microscopic (2a), the second spectroscope (2b), third spectroscope (2c) two sides be coated with transmitance>99.5% fundamental frequency light anti-reflection film.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107394575A (en) * | 2017-08-24 | 2017-11-24 | 南京先进激光技术研究院 | The frequency doubling device of laser |
| CN113960847A (en) * | 2020-07-20 | 2022-01-21 | 中国科学院大连化学物理研究所 | Pulse laser frequency multiplier with continuously adjustable conversion efficiency and conversion efficiency adjusting method |
-
2017
- 2017-08-24 CN CN201721067954.XU patent/CN207474912U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107394575A (en) * | 2017-08-24 | 2017-11-24 | 南京先进激光技术研究院 | The frequency doubling device of laser |
| CN113960847A (en) * | 2020-07-20 | 2022-01-21 | 中国科学院大连化学物理研究所 | Pulse laser frequency multiplier with continuously adjustable conversion efficiency and conversion efficiency adjusting method |
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