CN201373964Y - Frequency doubling system outside laser cavity - Google Patents
Frequency doubling system outside laser cavity Download PDFInfo
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- CN201373964Y CN201373964Y CN200820233860U CN200820233860U CN201373964Y CN 201373964 Y CN201373964 Y CN 201373964Y CN 200820233860 U CN200820233860 U CN 200820233860U CN 200820233860 U CN200820233860 U CN 200820233860U CN 201373964 Y CN201373964 Y CN 201373964Y
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Abstract
The utility model relates to a frequency doubling system outside a laser cavity, which mainly used for synchronously outputting four laser wave lengths (basic frequency lasers, double frequency lasers, treble frequency lasers and quadruple frequency lasers) and controlling the energy of the lasers in the field of laser and matter interaction research. The prior frequency doubling technology is incapable of synchronously outputting lasers with various wave lengths. When the wave lengths of the lasers are changed, a frequency doubling device needs to be changed repeatedly to carry large mechanical regulation. Basic frequency light is reflected by a total reflecting mirror (15) and enters a first half wave plate (16), after the polarization state of the basic frequency lasers is changed, the basic frequency lasers are split into two beams by a first polarization beam splitter prism (17), one basic frequency laser beam is used for directly outputting basic frequency output lasers (35), and the other basic frequency laser beam waits for frequency doubling treatment. The frequency doubling system uses the first half wave plate to regulate a laser polarization direction and splits the lasers into beams by the polarization beam splitter prism. On the basis of the character that a laser split energy ratio depends on an incident light polarization direction, the frequency doubling system realizes the synchronous output and the energy free regulation of a plurality of frequency doubling wavelength lasers. The frequency doubling treatment is carried out by using the basic frequency lasers generated by the frequency doubling system to a laser device, and the synchronous output and the energy regulation of the basic frequency lasers, the double frequency lasers, the treble frequency lasers and the quadruple frequency lasers can be realized by rotating the half wave plate.
Description
Technical field
Output and control of energy when the utility model laser cavity external frequency multiplication system is mainly used in the research of laser and matter interaction four kinds of optical maser wavelengths (fundamental frequency light, two frequency doubled lights, frequency tripling light, quadruple frequency light).
Background technology
The appearance of laser makes people have a kind of powerful light source of studying the profound rule of material.Laser is applied to fields such as chemistry, biology in recent years, has formed many emerging cross disciplines.In laser and this fundamental research field of matter interaction, by changing optical maser wavelength, energy, further investigate the dynamic law of molecule/atom, become the technological means that people make earnest efforts.In view of the expensive cost of laser instrument,, become to obtain the effective means of different wave length laser by basic frequency laser is carried out process of frequency multiplication.Existing laser freuqency doubling scheme, adopt by changing frequency-doubling crystal and filter obtained different wavelength of laser more.As shown in Figure 1, total reflective mirror 1, adjusting Q crystal 2, polaroid 3, actuating medium 4, pump light source 5, right angle turning mirror 6, output coupling mirror 7, amplification constitute the output of fundamental frequency light with actuating medium 8.When using the laser of two frequency multiplication wavelength, need two frequency-doubling crystals 9, basic frequency laser wave filter 10 are installed,, obtain optimum two double-frequency lasers output by mechanical adjustment total reflective mirror 1, output coupling mirror 7 and two frequency-doubling crystals 9; When using the laser of frequency tripling wavelength, need two frequency-doubling crystals 9, frequency tripling crystal 11, Hi-pass filter 12 are installed,, obtain optimum frequency tripling wavelength laser by mechanical adjustment total reflective mirror 1, output coupling mirror 7, two frequency-doubling crystals 9, frequency tripling crystal 11; When using the quadruple wavelength laser, need to install two frequency-doubling crystals 9, fundamental frequency optical filter 10, quadruple frequency crystal 13, two frequency doubled light wave filters 14, by mechanical adjustment total reflective mirror 1, output coupling mirror 7, two frequency-doubling crystals 9, quadruple frequency crystal 13, obtain the laser output of optimum quadruple wavelength.In the present laser freuqency doubling process, need change the frequency multiplication device repeatedly, and carry out a large amount of mechanical adjustment, have following two aspect problems.The first, each adjusting can only be exported a kind of laser of wavelength, output when can't realize multi-wavelength's laser; The second, during conversion optical maser wavelength, need to change frequency-doubling crystal, and carry out a large amount of mechanical adjustment, take time and effort.
The utility model content
Based on the problem that exists in the present laser freuqency doubling process, the utility model laser cavity external frequency multiplication system has converted the mechanical adjustment that takes time and effort the optical adjustment of simple easy operating to, and output when having realized a plurality of frequency multiplication wavelength laser.Fig. 2 shows the laser cavity external frequency multiplication system block diagram.
Total reflective mirror 1, adjusting Q crystal 2, polaroid 3, actuating medium 4, pump light source 5, right angle turning mirror 6, output coupling mirror 7, amplification constitute the fundamental frequency output of laser instruments with actuating medium 8.
Fundamental frequency light enters first half-wave plate 16 through total reflective mirror 15 reflections, and the fundamental frequency light behind the change polarization state is divided into two bundles by first polarization beam splitter prism 17, a branch of direct output, a branch of process of frequency multiplication of carrying out.Use the fundamental frequency light time, rotate first half-wave plate 16, realize fundamental frequency output light 35 control of energy.
Fundamental frequency light is divided into two bundles by second polarization beam splitter prism 19, a branch of two process of frequency multiplication of carrying out, other process of frequency multiplication of another Shu Jinhang after second half-wave plate 18 changes polarization state.Because two frequency-doubling crystals have requirement to fundamental frequency polarisation of light direction, therefore, the fundamental frequency light that carries out two process of frequency multiplication at first carries out polarization by the 3rd half-wave plate 20 to be regulated, carry out frequency multiplication by the one or two frequency-doubling crystal 21 then, fundamental frequency light and two frequency doubled lights are coaxial mixes in the laser after the frequency multiplication,, with the fundamental frequency light absorption two double-frequency lasers 36 are exported by first wave filter 22.When using two double-frequency lasers, by regulating the energy control of first half-wave plate 16, second half-wave plate, 18 realizations, two frequencys multiplication output light 36.
Fundamental frequency light is divided into two bundles by the 3rd polarization beam splitter prism 24 after the 4th half-wave plate 23 is regulated polarization state, a branch of frequency tripling that carries out is handled, and a branch of quadruple of carrying out is handled.Same owing to the requirement of frequency-doubling crystal to the polarization direction, carry out the fundamental frequency light that frequency tripling is handled, at first regulate its polarization state by the 5th half-wave plate 30, and after the two or two frequency-doubling crystal 31 produces two double-frequency lasers, two double-frequency lasers and fundamental frequency light enter frequency tripling crystal 32 simultaneously and carry out sum of fundamental frequencies, produce frequency tripled laser.Fundamental frequency light, two frequency doubled lights, coaxial the mixing of frequency tripling light enter second wave filter 33, and fundamental frequency light and two frequency doubled lights are absorbed, and frequency tripling light is exported frequency tripled laser 38 through total reflective mirror 34 reflection transformation directions.When using frequency tripled laser, by regulating the energy control of first half-wave plate 16, second half-wave plate 18, the 4th half-wave plate 23 realization frequency tripled lasers 38.
According to the requirement of frequency-doubling crystal to the polarization direction, carry out the fundamental frequency light that quadruple is handled, at first carry out polarization and regulate by the 6th half-wave plate 25, and after the three or two frequency-doubling crystal 26, generate two double-frequency lasers, behind the 3rd wave filter 27, fundamental frequency light is absorbed, and two frequency doubled lights are behind quadruple frequency crystal 28, produce laser of quadruple, two frequency doubled lights and quadruple frequency light be coaxial to mix and enters the 4th wave filter 29, two frequency doubled lights and be absorbed output quadruple frequency light 37.When using laser of quadruple, by regulating the energy control of first half-wave plate 16, second half-wave plate 18, the 4th half-wave plate 23 realization laser of quadruple 37.
Simultaneously, can control the energy distribution of fundamental frequency light in each frequency multiplication process arbitrarily by regulating first half-wave plate 16, second half-wave plate 18, the 4th half-wave plate 23, thereby output when realizing four kinds of optical maser wavelengths, and the output energy can be controlled easily by regulating the respective half wave sheet.
The utility model principle is as follows:
1) passes through the size that first half-wave plate 16 and first polarization beam splitter prism 17 are controlled the basic frequency laser energy.
Laser through first half-wave plate 16 after, the angle of establishing its linear polarization and horizontal direction is θ, as Fig. 3.This linearly polarized light is during through first polarization beam splitter prism, the polarized component E of its horizontal direction
//Seeing through crystal directly exports; The polarized component E of its vertical direction
⊥Then after crystal reflection, export.Output fundamental frequency luminous energy E
//Represent by (1) formula:
E
//＝E
0×Cosθ (1)
By rotating first half-wave plate 16, change θ, realize output fundamental frequency luminous energy E
//Control.When θ=0 °, output fundamental frequency luminous energy maximum; When θ=90 °, output fundamental frequency luminous energy minimum.
2) size by first half-wave plate 16, first polarization beam splitter prism 17, second half-wave plate 18, second polarization beam splitter prism, 19 controls, two double-frequency laser energy.
Basic frequency laser E
⊥Behind second half-wave plate 18, the angle of establishing its linear polarization and horizontal direction is θ
2, as Fig. 4.This linearly polarized light is during through second polarization beam splitter prism 19, the polarized component E of its horizontal direction
(2) //Seeing through crystal directly exports; The polarized component E of its vertical direction
(2) ⊥Then after crystal reflection, export.
Fundamental frequency light E
(2) ⊥Undertaken carrying out frequency multiplication by the one or two frequency-doubling crystal 21 after polarization regulates by the 3rd half-wave plate 20, fundamental frequency light and two frequency doubled lights are coaxial mixes in the laser after the frequency multiplication, by first wave filter 22 with the fundamental frequency light absorption, with 36 outputs of two double-frequency lasers.E
(2) ⊥Intensity directly determined the output energy size of two frequency doubled lights 36.E
(2) ⊥Intensity represent by (2) formula:
E
(2) ⊥＝E
0×Sinθ×Sinθ
2 (2)
By rotating first half-wave plate, 16, the second half-wave plates 18, just can realize output fundamental frequency luminous energy E
(2) ⊥Control, promptly realize two frequency doubled light control of energy.As θ=90 ° and θ
2In the time of=90 °, export the energy maximum of two frequency doubled lights; As θ=0 ° or θ
2, export the energy minimum of two frequency doubled lights at=0 o'clock.
3) by first half-wave plate 16, first polarization beam splitter prism 17, second half-wave plate 18, second polarization beam splitter prism 19, the 4th half-wave plate 23 and the 3rd polarization beam splitter prism 24, the size of control frequency tripled laser energy.
Fundamental frequency light E
(2) //Behind the 4th half-wave plate 23, the angle of establishing its linear polarization and horizontal direction is θ
3, as Fig. 5.This linearly polarized light is during through the 3rd polarization beam splitter prism 24, the polarized component E of its horizontal direction
(3) //Seeing through crystal directly exports; The polarized component E of its vertical direction
(3) ⊥Then after crystal reflection, export.
Fundamental frequency light E
(3) //Undertaken producing two double-frequency lasers through the two or two frequency-doubling crystal 31 after polarization regulates by the 5th half-wave plate 30, two double-frequency lasers and fundamental frequency light enter frequency tripling crystal 32 simultaneously and carry out sum of fundamental frequencies, produce frequency tripled laser.Fundamental frequency light, two frequency doubled lights, coaxial the mixing of frequency tripling light enter second wave filter 33, and fundamental frequency light and two frequency doubled lights are absorbed, and frequency tripling light is exported frequency tripled laser 38 through total reflective mirror 34 reflection transformation directions.E
(3) //Intensity directly determined the output energy of frequency tripling light 38.E
(3) //Intensity represent by (3) formula:
E
(3) //＝E
0×Sinθ×Cosθ
2×Cosθ
3 (3)
By rotating first half-wave plate, 16, the second half-wave plates, 18, the four half-wave plates 23, just can realize output fundamental frequency luminous energy E
(3) //Control, promptly realize the control of frequency tripling luminous energy.As θ=90 °, θ
2=0 ° and θ
3In the time of=0 °, the energy maximum of output frequency tripling light; As θ=0 ° or θ
2=90 ° or θ
3In the time of=90 °, the energy minimum of output frequency tripling light.
4) by first half-wave plate 16, first polarization beam splitter prism 17, second half-wave plate 18, second polarization beam splitter prism 19, the 4th half-wave plate 23 and the 3rd polarization beam splitter prism 24, the size of control quadruple frequency light energy.
Fundamental frequency light E
(3) ⊥Undertaken after polarization regulates by the 6th half-wave plate 25, through the three or two frequency-doubling crystal 26, generate two double-frequency lasers, behind the 3rd wave filter 27, fundamental frequency light is absorbed, and two frequency doubled lights are behind quadruple frequency crystal 28, produce laser of quadruple, two frequency doubled lights and quadruple frequency light be coaxial to mix and enters the 4th wave filter 29, two frequency doubled lights and be absorbed output quadruple frequency light 37.E
(3) ⊥Intensity directly determined the output energy of quadruple frequency light 37.E
(3) ⊥Intensity represent by (4) formula:
E
(3) ⊥＝E
0×Sinθ×Cosθ
2×Sinθ
3 (4)
By rotating first half-wave plate, 16, the second half-wave plates, 18, the four half-wave plates 23, just can realize output fundamental frequency luminous energy E
(3) ⊥Control, realize the quadruple frequency light control of energy simultaneously.As θ=90 °, θ
2=0 ° and θ
3In the time of=90 °, the energy maximum of output quadruple frequency light; As θ=0 ° or θ
2=90 ° or θ
3In the time of=0 °, the energy minimum of output quadruple frequency light.
The utility model laser cavity external frequency multiplication system has solved the problem that the mechanical adjustment that exists in the present laser freuqency doubling process takes time and effort, can not export a plurality of wavelength lasers simultaneously.It advantage that possesses is as follows: the first, and output when having realized four kinds of optical maser wavelengths.The second, by rotating relevant half-wave plate easily, realize the control of different wave length laser energy.The 3rd, the frequency multiplication adjustment process is time saving and energy saving.
Description of drawings
Fig. 1 has laser freuqency doubling process block diagram now
Fig. 2 laser cavity external frequency multiplication system block diagram
Fig. 3 polarization beam splitter prism beam split synoptic diagram
Fig. 4 polarization beam splitter prism beam split synoptic diagram
Fig. 5 polarization beam splitter prism beam split synoptic diagram
Embodiment
The 1064nm fundamental frequency light that the laser freuqency doubling system of employing said structure produces Nd:YAG laser instrument (Byelorussia SOLARTIILF117) has carried out process of frequency multiplication and energy control thereof.
The control of fundamental frequency 1064nm laser energy
By rotating first half-wave plate 16, realize the control of fundamental frequency 1064nm laser single-pulse energy.When θ=0 °, the single pulse energy maximum of 1064nm basic frequency laser is 850mJ; When θ=90 °, the single pulse energy of 1064nm basic frequency laser is 0.
The control of two frequency multiplication 532nm laser energies
By rotating first half-wave plate 16, second half-wave plate 18, two frequency-doubling crystal KD have been realized
*The control of the 532nm two double-frequency laser single pulse energies that P produces.As θ=90 ° and θ
2In the time of=90 °, the single pulse energy of output 532nm two double-frequency lasers is 500mJ to the maximum; As θ=0 ° or θ
2=0 o'clock, the single pulse energy of output 532nm two double-frequency lasers was 0.
The control of frequency tripling 355nm laser energy
Realized the control of the 355nm frequency tripled laser single pulse energy that two frequency-doubling crystal KD*P and frequency tripling crystal BBO produce by rotating first half-wave plate 16, second half-wave plate 18, the 4th half-wave plate 23.
As θ=90 °, θ
2=0 ° and θ
3In the time of=0 °, the single pulse energy of output frequency tripled laser is 350mJ to the maximum; As θ=0 ° or θ
2=90 ° or θ
3In the time of=90 °, the energy of output frequency tripling light is 0.
The control of quadruple 266nm laser energy
Realized the control of the quadruple frequency light 266nm single pulse energy that two frequency-doubling crystal KD*P and quadruple frequency crystal BBO produce by rotating first half-wave plate 16, second half-wave plate 18, the 4th half-wave plate 23.
As θ=90 °, θ
2=0 ° and θ
3In the time of=90 °, the energy of output quadruple frequency light is 200mJ to the maximum; As θ=0 ° or θ
2=90 ° or θ
3In the time of=0 °, the energy of output quadruple frequency light is 0.
Adopt the laser freuqency doubling system of said structure that the 1064nm fundamental frequency light that Nd:YAG laser instrument (Byelorussia SOLARTIILF117) produces has been carried out process of frequency multiplication.By rotating first half-wave plate 16, the single pulse energy of fundamental frequency 1064nm laser is by the variation of 0-850mJ.By rotating first half-wave plate 16, second half-wave plate 18, realized that two frequency-doubling crystal KD*P produce the variation of the single pulse energy of frequency multiplication 532nm laser by 0-500mJ.By rotating the variation of frequency tripling 355nm laser single-pulse energy that first half-wave plate 16, second half-wave plate 18, the 4th half-wave plate 23 realized that two frequency-doubling crystal KD*P and frequency tripling crystal BBO produce by 0-350mJ.By rotating the control of quadruple frequency light 266nm single pulse energy that first half-wave plate 16, second half-wave plate 18, the 4th half-wave plate 23 realized that two frequency-doubling crystal KD*P and quadruple frequency crystal BBO produce by 0-200mJ.By rotating first half-wave plate 16, second half-wave plate 18, the 4th half-wave plate 23, output when having realized fundamental frequency light 1064nm, two frequency doubled light 532nm, frequency tripling light 355nm, quadruple frequency light 266nm.
Claims (4)
1. laser cavity external frequency multiplication system, total reflective mirror (1), adjusting Q crystal (2), polaroid (3), actuating medium (4), pump light source (5), right angle turning mirror (6), output coupling mirror (7), amplification are exported with the fundamental frequency that actuating medium (8) constitutes laser instrument, it is characterized in that:
Fundamental frequency light enters first half-wave plate (16) through total reflective mirror (15) reflection, and the fundamental frequency light behind the change polarization state is divided into two bundles by first polarization beam splitter prism (17), a branch of direct output fundamental frequency output light (35), and a branch of fundamental frequency light awaits carrying out process of frequency multiplication.
2, laser cavity external frequency multiplication system according to claim 1, it is characterized in that: above-mentionedly await carrying out the fundamental frequency light of process of frequency multiplication after second half-wave plate (18) changes polarization state, be divided into two bundles by second polarization beam splitter prism (19), a branch of fundamental frequency light carries out two process of frequency multiplication, and another bundle fundamental frequency light awaits carrying out other process of frequency multiplication; The fundamental frequency light that carries out two process of frequency multiplication at first carries out polarization by the 3rd half-wave plate (20) to be regulated, carry out frequency multiplication by the one or two frequency-doubling crystal (21) then, fundamental frequency light and two frequency doubled lights are coaxial mixes in the laser after the frequency multiplication,, with the fundamental frequency light absorption two double-frequency lasers (36) are exported by first wave filter (22).
3. laser cavity external frequency multiplication system according to claim 2, it is characterized in that: above-mentionedly await carrying out the fundamental frequency light of other process of frequency multiplication after the 4th half-wave plate (23) is regulated polarization state, be divided into two bundles by the 3rd polarization beam splitter prism (24), a branch of frequency tripling that carries out is handled, and a branch ofly awaits carrying out quadruple and handles;
Carry out the fundamental frequency light that frequency tripling is handled, at first regulate its polarization state by the 5th half-wave plate (30), and after the two or two frequency-doubling crystal (31) produces two double-frequency lasers, two double-frequency lasers and fundamental frequency light enter frequency tripling crystal (32) simultaneously and carry out sum of fundamental frequencies, produce frequency tripled laser; Fundamental frequency light, two frequency doubled lights, coaxial the mixing of frequency tripling light enter second wave filter (33), and fundamental frequency light and two frequency doubled lights are absorbed, and frequency tripling light is exported frequency tripled laser (38) through total reflective mirror 34 reflection transformation directions.
4 laser cavity external frequency multiplication systems according to claim 3, it is characterized in that: above-mentionedly await carrying out fundamental frequency light that quadruple handles and carry out polarization by the 6th half-wave plate (25) and regulate, and after the three or two frequency-doubling crystal (26), generate two double-frequency lasers, behind the 3rd wave filter (27), fundamental frequency light is absorbed, two frequency doubled lights are behind quadruple frequency crystal (28), produce laser of quadruple, coaxial the mixing of two frequency doubled lights and quadruple frequency light enters the 4th wave filter (29), two frequency doubled lights are absorbed, output quadruple frequency light (37).
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|---|---|---|---|
| CN200820233860U CN201373964Y (en) | 2008-12-26 | 2008-12-26 | Frequency doubling system outside laser cavity |
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|---|---|---|---|
| CN200820233860U CN201373964Y (en) | 2008-12-26 | 2008-12-26 | Frequency doubling system outside laser cavity |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102486406A (en) * | 2010-12-27 | 2012-06-06 | 北京国科世纪激光技术有限公司 | Laser energy detection system and detection method thereof |
| CN106654850A (en) * | 2015-07-14 | 2017-05-10 | 中国科学院大连化学物理研究所 | Deep UV-visible region wavelength continuously adjustable nanosecond and picosecond pulsed laser |
| CN108761622A (en) * | 2018-08-17 | 2018-11-06 | 山东大学 | A kind of true zero level optical wave plate of the large scale of low wavelength sensitivity and the preparation method and application thereof |
-
2008
- 2008-12-26 CN CN200820233860U patent/CN201373964Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102486406A (en) * | 2010-12-27 | 2012-06-06 | 北京国科世纪激光技术有限公司 | Laser energy detection system and detection method thereof |
| CN106654850A (en) * | 2015-07-14 | 2017-05-10 | 中国科学院大连化学物理研究所 | Deep UV-visible region wavelength continuously adjustable nanosecond and picosecond pulsed laser |
| CN108761622A (en) * | 2018-08-17 | 2018-11-06 | 山东大学 | A kind of true zero level optical wave plate of the large scale of low wavelength sensitivity and the preparation method and application thereof |
| CN108761622B (en) * | 2018-08-17 | 2024-01-23 | 山东大学 | Large-size true zero-order optical wave plate with low wavelength sensitivity and preparation method and application thereof |
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| C14 | Grant of patent or utility model | ||
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Granted publication date: 20091230 Termination date: 20101226 |