CN205944719U - End -pumped laser - Google Patents
End -pumped laser Download PDFInfo
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- CN205944719U CN205944719U CN201520794475.2U CN201520794475U CN205944719U CN 205944719 U CN205944719 U CN 205944719U CN 201520794475 U CN201520794475 U CN 201520794475U CN 205944719 U CN205944719 U CN 205944719U
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Abstract
The utility model relates to a solid laser specifically is an end -pumped laser, including pumping unit, focus coupled system, gain medium -, resonant cavity, pumping light line focus coupled system to the laser crystal that sends of pumping unit wherein, wherein focus coupled system arrange by three plane -convex mirrors in proper order and constitute, the convex surface of 2 slice preceding plane -convex mirrors is hugged closely relatively and is used for carrying out the collimation to the pumping light that incides, the 3rd plane -convex lens convex surface is outside, focuses on the parallel light to gain medium -, wherein gain medium - be the crystal that the gradual change was adulterateed, the utility model discloses a to the focus coupled system of pump laser and the technical characteristics who has increased gain medium -, make the pump laser have the reduction fuel factor, increase the advantage of light transformation rate.
Description
Technical field
The present invention relates to a kind of solid state laser, specially a kind of end-pumped laser.
Background technology
Laser instrument is pressed pump mode and is divided, and can be divided into end-pumped laser and side-pumped laser.Profile pump
It is a kind of traditional pump mode, its advantage is that pump light is axially uniformly distributed along crystal, therefore in gain media axial direction
Heat is uniformly distributed, but its shortcoming is that pattern coverage is poor, and laser threshold is high, and efficiency is low.Compared with profile pump, end face pump
Pu mode can realize preferable pattern match between pump light and laser, therefore have that laser threshold is low, pumping efficiency is high and
The advantages of compact conformation.With demands to superpower laser for the field such as industry and science and technology, design power output height,
The end-pumped laser of good beam quality and compact conformation has become required, and the entering of laser diode design and production technology
Walk and provide prerequisite for all solid state laser obtaining high-output power.
So far, optical fiber couples output semiconductor laser and the peak power output of diode laser matrix reaches
500W.But in end-pumped laser, because pump light is along the Propagation of gain media, in the pumping end surface of crystal,
The intensity highest of pump light, the temperature highest of crystal, fuel factor most serious；With pump light away from gain media pumping end
Face, the intensity of pump light is more and more weaker, and the temperature of crystal is more and more lower, and the fuel factor of crystal is also more and more weaker, non-in crystal
Pumping end surface, the intensity of pump light is the weakest, and the temperature of crystal is minimum, and the fuel factor of crystal is the weakest.Therefore, mitigate laser crystal heat
The key of effect is the fuel factor mitigating crystal pumping end surface.
Therefore, adopt an effective measure and overcome low this conflict serious with fuel factor of absorption efficiency, end pumping is swashed
It is very important for light device.
Content of the invention
In order to overcome above technical problem, the present invention provides a kind of good beam quality, hard-packed end pumped laser
Device.
In order to overcome the serious fuel factor of pumping end surface in high power end-pumped laser, the present invention devises gradual change and mixes
Miscellaneous laser crystal, and use it as the gain media of laser instrument.Single doping content crystal as gain media end
In face-pumping laser, pump light along the Propagation of gain media, in the pumping end surface of crystal, pumping light power highest；With
Pump light to propagate in the gain medium, absorb, the power of pump light is less and less.Therefore in end-pumped laser, pump
The fuel factor most serious of Pu end face, from pumping end surface more away from, fuel factor is lighter, and the fuel factor of non-pumped end face is the lightest.Gain is situated between
In matter, the temperature of different piece and this position be from the distance dependent of pumping end surface, in pumping end surface, the temperature highest of gain media；
From pumping end surface more away from, temperature is lower；In non-pumped end face, the temperature of gain media is minimum, exponentially rule distribution.Gain is situated between
The absorption coefficient of confrontation pump light is relevant with doping content, and doping content is higher, and absorption coefficient is bigger；Doping content is lower, inhales
Receive coefficient less.If reducing the doping content of gain media, the fuel factor of crystal end-face can be improved, but lead to gain media
The absorption coefficient of pump light is diminished, affects the absorption efficiency to pump light for the gain media.Because gradual change type doped crystal is each
Partial doping content is different, also unequal to the absorption coefficient of pump light, and we devise one, and along crystal, axially doping is dense
The gradual change crystal of degree monotone increasing or reduction, as gain media, makes in the pumping end surface of gain media, the doping content of crystal
Minimum；With the pumping end surface that is located away from the gain medium, the doping content more and more higher of crystal；Non- in gain media
Pumping end surface, the doping content highest of crystal.This design had not only alleviated the fuel factor of gain media pumping end surface but also had improve
The absorption to pump light for the gain media other parts, effectively overcomes that fuel factor is serious and absorption efficiency this conflict low.But
It is that gradual change type doped crystal is not easy to grow, therefore first have to grow the single doped crystal of different levels of doping, then will
The crystal of single doping content according to the dimension key being pre-designed altogether, can get the crystal of gradient doping.
The following is concrete technical scheme：A kind of end-pumped laser, including pump unit, focuses on coupled system, gain
The pump light line focus coupled system that medium, resonator, wherein pump unit send to laser crystal, wherein said focusing
Coupled system is rearranged by three planoconvex lens successively, and the convex surface of front 2 planoconvex lens is close to relatively for entering to incident pump light
Row collimation, outwards, by parallel light focusing to gain media, wherein said gain media is gradual change to the 3rd planoconvex lens convex surface
Doped crystal.The present invention by being modified to the light path of laser instrument, former laser output mouth at the hysteroscope of the second light path,
Degree of regulation has high demands, and increased light modulation difficulty.Laser output mouth is adjusted on key light shaft position, reduces light modulation difficulty
And the complexity of optical bench design processing.Due to using flat-concave cavity, in the presence of by external force, it is not result in light beam matter
Amount and power produce larger change.
Further, gain media includes pumping end surface and non-pumped end face, wherein in the pumping end surface of gain media, brilliant
The doping content of body is lower；With the pumping end surface that is located away from the gain medium, the doping content more and more higher of crystal；?
The non-pumped end face of gain media, the doping content of crystal is then higher.
Further, the distance between the 3rd planoconvex lens and front 2 planoconvex lens are adjustable.
Further, laserresonator includes 2～10 hysteroscopes.
Further, the crystal of gradient doping is the crystal of the layer structure that more than two-layer is bonded together, same layer
Doping content is identical, and each layer of doping content is gradually increased with the increase with pumping end surface distance, and initial layers doping is dense
Spend minimum 0.005%, end layer doping content is up to 2%.
Further, initial layers doping content minimum 0.01%, end layer doping content is up to 1%.
Beneficial effect：The present invention is by the technology spy focusing on coupled system with increased gain media to pump laser
Levy, make pump laser have reduction fuel factor, the advantage increasing light conversion ratio.
Brief description
Fig. 1 is structural representation of the present utility model.
Wherein：1st, laser instrument 2, optical fiber 3, focusing coupled system 4, the first planoconvex lens 5, the second planoconvex lens 6, the 3rd planoconvex lens
7th, hysteroscope 8, gain media 9, laserresonator 10, hysteroscope 11, hysteroscope 12, Q switched element 13, hysteroscope 14, output end 15, non-end Pu
End face 16, pumping end surface.
Specific embodiment
With reference to Figure of description, the utility model will be further described.
A kind of end-pumped laser, including pump unit, focuses on coupled system, gain media, resonator, wherein pumping
, to laser crystal, wherein said focusing coupled system is successively by three plano-convexs for the pump light line focus coupled system that unit sends
Mirror rearranges, and the convex surface of front 2 planoconvex lens is close to for collimating to incident pump light relatively, and the 3rd planoconvex lens is convex
Face out, by parallel light focusing to gain media, wherein said gain media 8 is the crystal of gradient doping.The present invention passes through
The light path of laser instrument is modified, at the hysteroscope of the second light path, degree of regulation has high demands former laser output mouth, increased
Light modulation difficulty.Laser output mouth is adjusted on key light shaft position, reduces light modulation difficulty and optical bench designs processing
Complexity.Due to using plano-convex chamber, in the presence of by external force, it is not result in that beam quality and power produce larger change
Change.
Further, gain media includes pumping end surface 16 and non-pumped end face 15, wherein at the pumping end of gain media
Face 16, the doping content of crystal is lower；With in the gain medium 8 pumping end surface that is located away from, the doping content of crystal is got over
Come higher；In the non-pumped end face 15 of gain media, the doping content of crystal is then higher.Further, the 3rd planoconvex lens 6 and front 2
The distance between piece planoconvex lens 5 is adjustable.
Further, laserresonator includes 2～10 hysteroscopes.
Further, the crystal of gradient doping is the crystal of the layer structure that more than two-layer is bonded together, same layer
Doping content is identical, and each layer of doping content is gradually increased with the increase with pumping end surface distance, and initial layers doping is dense
Spend minimum 0.005%, end layer doping content is up to 2%.
Further, initial layers doping content minimum 0.01%, end layer doping content is up to 1%.
With reference to the accompanying drawings 1, resonator 9 is Z- font laserresonator, by hysteroscope 7, hysteroscope 10, hysteroscope 11 and 13 groups of hysteroscope
Become.Gain media is the Nd of gradient doping：YVO4 crystal, this crystal is 5 laminate, and front 1 thickness degree is 1 millimeter, the 2nd, 3
Thickness degree is 2 millimeters every layer, and the 4th, 5 thickness degree are every layer 3 milli.
Claims (5)
1. a kind of end-pumped laser is it is characterised in that including pump unit, focusing on coupled system, gain media, resonance
Chamber, wherein pump unit are connected with focusing on coupled system, focus on coupled system and are connected with resonator, wherein pump unit is sent out
The pump light line focus coupled system going out is arranged by three planoconvex lens successively to laser crystal, wherein said focusing coupled system
Composition, the convex surface of front 2 planoconvex lens is close to for collimating to incident pump light relatively, and the 3rd planoconvex lens convex surface is outside,
By parallel light focusing to gain media, wherein said gain media is the crystal of gradient doping.
2. a kind of end-pumped laser according to claim 1 is it is characterised in that described gain media includes pumping
End face and non-pumped end face, wherein in the pumping end surface of gain media, the doping content of crystal is lower；With in the gain medium
Be located away from pumping end surface, the doping content more and more higher of crystal；In the non-pumped end face of gain media, the doping of crystal is dense
Degree is then higher.
3. a kind of end-pumped laser according to claim 1 it is characterised in that described the 3rd planoconvex lens with first 2
The distance between planoconvex lens is adjustable.
4. a kind of end-pumped laser according to claim 1 is it is characterised in that described laserresonator includes 2
～10 hysteroscopes.
5. a kind of end-pumped laser according to claim 1 it is characterised in that described resonator pass through hysteroscope with
Q switched element is connected, and wherein said Q switched element is included in mechanical Q-switch, electro-optical Q-switch, acousto-optic Q-switching or passive Q-switch
One kind.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520794475.2U CN205944719U (en) | 2015-09-30 | 2015-09-30 | End -pumped laser |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520794475.2U CN205944719U (en) | 2015-09-30 | 2015-09-30 | End -pumped laser |
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| CN205944719U true CN205944719U (en) | 2017-02-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110137791A (en) * | 2018-02-09 | 2019-08-16 | 中国科学院福建物质结构研究所 | A kind of long pulsewidth laser using 4f Image relaying system |
-
2015
- 2015-09-30 CN CN201520794475.2U patent/CN205944719U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110137791A (en) * | 2018-02-09 | 2019-08-16 | 中国科学院福建物质结构研究所 | A kind of long pulsewidth laser using 4f Image relaying system |
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Addressee: Hu Haiying Document name: Notification of Acceptance of Patent Application |
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| DD01 | Delivery of document by public notice |
Addressee: JINAN JINGZHONG OPTOELECTRONICS TECHNOLOGY Co.,Ltd. Document name: Notification of an Office Action |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |