CN202651614U - End face pumping active Q-adjusting outside-cavity frequency multiplication green light laser - Google Patents
End face pumping active Q-adjusting outside-cavity frequency multiplication green light laser Download PDFInfo
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- CN202651614U CN202651614U CN2012202344359U CN201220234435U CN202651614U CN 202651614 U CN202651614 U CN 202651614U CN 2012202344359 U CN2012202344359 U CN 2012202344359U CN 201220234435 U CN201220234435 U CN 201220234435U CN 202651614 U CN202651614 U CN 202651614U
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- 229910017502 Nd:YVO4 Inorganic materials 0.000 description 2
- QBLDFAIABQKINO-UHFFFAOYSA-N barium borate Chemical compound [Ba+2].[O-]B=O.[O-]B=O QBLDFAIABQKINO-UHFFFAOYSA-N 0.000 description 2
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Abstract
The utility model discloses an end face pumping active Q-adjusting outside-cavity frequency multiplication green light laser, comprising a laser pumping resource, an energy transmission optical fiber, an optical coupling system, a V-shaped folded cavity, a laser crystal, an active Q-adjusting switch, a steering lens, a focusing lens, a non-linear frequency multiplication crystal, a collimating lens and a harmonic separation lens. The laser generates a high peak power quasi-continuous fundamental frequency light output in an active Q-adjusting mode, the output fundamental frequency light is focused on the outside-cavity non-linear frequency multiplication crystal through a focusing lens to generate fine light spots and a high fundamental frequency light power density, and a green light output can be obtained after the frequency multiplication crystal; and compared with the inside-cavity frequency multiplication mode, the outside-cavity frequency multiplication mode is better in stability, flexible in structure and easy in adjustment. In the utility model, the conversion efficiency from the fundamental frequency light to the frequency multiplication light is more than 50%, and the average power of the green light is more than 4.5 W. The end face pumping active Q-adjusting outside-cavity frequency multiplication green light laser can be widely applied to industrial machining, scientific research, medical treatment, military, etc.
Description
Technical field
The utility model relates to laser technology field, particularly relates to initiatively green light laser capable of regulating Q cavity external frequency multiplication of a kind of end pumping.It is suitable for the application in the fields such as pumping source, laser medicine and scientific research of laser marking, body laser inner carving, laser scribing, other laser.
Background technology
Most end pump green laser laser all is the intracavity frequency doubling mode that adopts in the market.This mode compact conformation, beam quality is better, and shg efficiency is higher, can utilize the high power density in the chamber to obtain larger frequency doubling green light output, but this mode runs into the less stable problem that the longitudinal mode competition causes easily.Produce the very large fluctuation of amplitude owing in the chamber, produce the basic frequency laser longitudinal mode of vibration and the variation of polarization state so that export the power of light, can not satisfy the requirement of some application, utilize unidirectional ring-like laser or utilization can eliminate space hole burning effect in the laser works medium to two mutual lotus roots of polarization state zlasing mode line chamber laser altogether, thereby reduce the fluctuation of power output, but their complex structure, cavity loss large, adjust difficulty, cost is higher.And the intracavity frequency doubling mode is not easy to design suitable resonant cavity to obtain simultaneously less basic frequency beam waist and short laser pulse width.In addition, the intracavity frequency doubling mode has increased the insertion loss of laserresonator, so that the oscillation threshold of laser increases, light-light conversion efficiency reduces.In addition, there is two-way frequency-doubled conversion process in the intracavity frequency doubling mode, and the green glow of frequency multiplication process generally can not effectively be exported for the second time, causes the loss of conversion efficiency.
The utility model content
The purpose of this utility model provides initiatively green light laser capable of regulating Q cavity external frequency multiplication of a kind of end pumping in order to solve the existing problems such as large and conversion efficiency is not high such as less stable, insertion loss in the above-mentioned prior art just.This laser structure is simple flexibly, the not constraint of Stimulated Light Resonator design structure, adopt to focus on the frequency multiplication mode and remedied the shortcoming that the cavity external frequency multiplication power density is lower than the intracavity frequency doubling mode, can freely select the focusing beam waist of fundamental frequency light on non-linear frequency-doubling crystal, to obtain best frequency-doubling conversion efficiency.
The purpose of this utility model realizes by following scheme: utilize the symmetrical fold chamber to reduce the impact of thermal lensing effect, utilize simultaneously coupled system to realize that the with a tight waist and position of pump beam in laser crystal and the basic mode size of vibration basic frequency laser are complementary, so that most of pump energy is converted to the basic mode vibration, thereby make output fundamental frequency light obtain preferably beam quality and higher power stability.Utilize the active Q-switch of placing in the laserresonator, obtain the nearly basic mode basic frequency laser output of high repetition frequency and short pulse width.The basic frequency laser of output can obtain less laser beam waist size after focusing on by condenser lens, thereby greatly increases laser power density.Basic frequency beam waist position after logical optical lens focuses on overlaps with the incident end face of frequency-doubling crystal, thereby obtains best frequency-doubling conversion efficiency.
A kind of end pumping is green light laser capable of regulating Q cavity external frequency multiplication initiatively, it comprises laser pumping source, the laser energy-transmission optic fibre, optical coupling system, laserresonator, laser crystal, the active Q-switch, the first deviation mirror, the second deviation mirror, condenser lens, frequency-doubling crystal, collimating lens, the first harmonic Separator lens, the second harmonic Separator lens, it is characterized in that: optical coupling system is comprised of first lens and second lens, the first lens collimate to the pump light of laser energy-transmission optic fibre output, second lens focuses on pump light, and the distance between first lens and second lens is adjustable; Laserresonator is " V " type refrative cavity structure, and its light path becomes " V " shape, consists of along fundamental frequency light optical routing total reflective mirror, chamber mirror and outgoing mirror; Laser crystal and active Q-switch are placed in the laserresonator, and the first deviation mirror, the second deviation mirror, focus lamp, frequency-doubling crystal, collimating lens, first harmonic separate mirror, the second harmonic Separator lens is placed on outside the laserresonator; The pump light that is produced by laser pumping source is by the collimation focusing of laser energy-transmission optic fibre and optical coupling system, and it is inner and fully absorbed by laser crystal that the chamber mirror that passes through again " V " type refrative cavity corner incides laser crystal; Then the oscillation threshold of laserresonator forms the basic frequency laser of pulse output by the active Q-switch modulation that is placed in the resonant cavity; Basic frequency laser is through outgoing mirror output, adjust incident direction through the first deviation mirror and the second deviation mirror again, by the condenser lens that is arranged on the outer certain position of laserresonator focus on the incident end face of non-linear frequency-doubling crystal and produce frequency doubling green light laser and remaining basic frequency laser again through the collimating lens collimation, frequency doubling green light laser sees through first harmonic and separates mirror output, remaining basic frequency laser is separated mirror by first harmonic and separates the mirror reflection with second harmonic, the basic frequency laser that formation can be exported with the frequency doubling green light laser parallel; Described total reflective mirror is 140mm to 160mm to the distance at laser crystal center, the center of chamber mirror is 10mm to 30mm to the distance at laser crystal center, outgoing mirror is 120mm to 140mm to the distance at mirror center, chamber, lens light output end center is 20mm to 40mm to the distance at laser crystal center, and the two arm angles of " V " die cavity are less than 20 degree.
The end pumping described in the utility model initiatively laser pumping light source of regulating Q cavity external frequency multiplication laser is 808nm semiconductor laser diode light source, and peak power output is 30W.
End pumping described in the utility model is the regulating Q cavity external frequency multiplication laser initiatively, its total reflective mirror is 150mm to the centre distance of laser crystal, the chamber mirror is 20mm to the centre distance of laser crystal, outgoing mirror is 130mm to the centre distance of chamber mirror, and pump light is 0.8mm through the average light spot diameter that coupled system focuses on the laser crystal.Two arm angles of " V " type refrative cavity are 18 degree; The light output end of lens is 30mm to the distance at laser crystal center; The basic frequency laser output beam quality factor is less than 1.3; Laser crystal is positioned at the center of equivalent cavity structure.
End pumping described in the utility model is green light laser capable of regulating Q cavity external frequency multiplication initiatively, its refrative cavity can equivalence be linear straight cavity configuration, the part energy of laser crystal absorptive pumping light source will be converted into heat, form non-homogeneous Temperature Distribution through supercooling at crystals, its effect equivalence is a condenser lens, is called thermal lensing effect.If LBO is n to the refractive index of fundamental frequency light, beam quality factor is M
2, the fundamental frequency light wavelength is λ, the laser beam waist radius is w
0, then export basic frequency laser and arrive the interior light beam Rayleigh range Z of non-linear frequency-doubling crystal through lens focus
RComputing formula be:
In order to reach effective frequency-doubling conversion efficiency, guarantee effective phase matched, the basic frequency laser light beam Rayleigh range that focuses in the non-linear frequency-doubling crystal must be greater than the length of non-linear frequency-doubling crystal.Therefore for the basic frequency laser of certain beam quality, there is I focusing parameter, beam quality is better in other words, and permission focuses on less spot size with basic frequency laser.
End pumping described in the utility model is green light laser capable of regulating Q cavity external frequency multiplication initiatively, and its active Q-switch is acousto-optic Q modulation or electro-optic Q switch.
Non-linear frequency-doubling crystal described in the utility model is potassium dihydrogen phosphate (KDP), three lithium borates (LBO), KTP (KTP) or barium metaborate (BBO) nonlinear optical crystal.
Laser crystal described in the utility model is Nd:YVO4 or Nd:YAG crystal.
The focal length of condenser lens described in the utility model and collimating lens is respectively 30mm to 100mm.
The focal length of lens described in the utility model is 12mm to 18mm, and the focal length of lens is 25mm to 35mm.
End pumping described in the utility model initiatively green light laser capable of regulating Q cavity external frequency multiplication has novel, reasonable in design, technological specification, simple installation, is easy to form the advantage such as industrialized mass production; Have that output beam quality is good, power stability, all solid state, the advantage such as compact conformation is flexible.The present invention can be widely used in the every field such as industrial processes, scientific research, medical treatment, military affairs; Be specially adapted to the fields such as pumping source of surface laser mark, body laser inner carving, retrofit, cutting, welding and other laser of various materials.
Description of drawings
Fig. 1 is initiatively green light laser capable of regulating Q cavity external frequency multiplication structural representation of end pumping;
Fig. 2 is in equivalent line chamber and the chamber, chamber outer light beam conversion schematic diagram;
Fig. 3 is the focusing transform schematic diagram of light beam in frequency-doubling crystal;
Among Fig. 2,6 and 7 is chamber mirror and the outgoing mirror of equivalent line chamber, the thermal lens of 8 equivalent cavity that produce for laser crystal, and 6 and 7 consist of equivalent cavity, and thermal lens 8 is at the center of equivalent cavity; 21 is fundamental frequency light beam profile, and 12 and 14 is the lens of focal length 50mm, and 13 is non-linear frequency-doubling crystal.
Among Fig. 3,21 for being focused into irradiating light beam, its with a tight waist dropping on the incident end face of non-linear frequency-doubling crystal 13; Beam profile after 22 the focusing when not having frequency-doubling crystal; 23 for focused beam by the beam profile behind the frequency-doubling crystal.
Embodiment
The related end pumping of the utility model is green light laser capable of regulating Q cavity external frequency multiplication initiatively, its technical scheme by reference to the accompanying drawings 1,2 and 3 be described in detail as follows:
Nd:YVO4 is got as laser crystal 8 by resonant cavity, laser crystal 8(in basic frequency laser of the present utility model source) and the pump unit formation.The resonant cavity of laser is " V " type refrative cavity structure, and its light path becomes " V " font, consists of along fundamental frequency light 18 optical routing total reflective mirrors 6, chamber mirror 5 and outgoing mirror 7; Speculum 6 is level crossing, its inboard plating fundamental frequency light (1064nm) high-reflecting film, chamber mirror 5 is plane mirror, its one side plating pump light (808nm) anti-reflection film, another side plates pump light anti-reflection film and fundamental frequency light high-reflecting film simultaneously, outgoing mirror 7 one sides are plated fundamental frequency light part reflectance coating, another side coating basic frequency light anti-reflection film; It is the structure centre of equivalent cavity that laser crystal 8 is positioned on the optical axis near chamber mirror 5, and laser crystal two logical light faces plate pump light and fundamental frequency light anti-reflection film simultaneously; Adopt pump light source 1(808nm) as pumping source; Pump unit is made of energy-transmission optic fibre 2 and coupled system; Coupled system is comprised of first lens 3 and second lens 4, first lens 3 and second lens 4 all plate the pump light anti-reflection film, the pump light 17 of 3 pairs of optical fiber outputs of first lens collimates, 4 pairs of pump lights of second lens 17 focus on, and the distance between first lens 3 and second lens 4 is adjustable; Pump light is by optical fiber and coupled system, and passing through chamber, " V " type refrative cavity turning mirror 5, to incide laser crystal 8 inner and fully absorbed by laser crystal 8 again; The oscillation threshold of laserresonator is by the two-sided coating basic frequency light anti-reflection film of active Q-switch 9(that is placed in the chamber) modulation, then form the basic frequency laser 18 that pulse is exported; The basic frequency laser 18 of pulse output all plates fundamental frequency light high-reflecting film through the first deviation mirror 10 and the second deviation mirror 11() the change direction of propagation; The basic frequency laser 18 of pulse output is by the condenser lens 12(coating basic frequency light anti-reflection film that is placed on the outer certain position of laserresonator) focus on non-linear frequency-doubling crystal 13(LBO, two-sided fundamental frequency light and the frequency doubled light anti-reflection film of all plating) on the incident end face, and in the frequency-doubling crystal 13 inner nonlinear frequency transformation processes that form; The frequency doubling green light laser 19 that is produced by frequency-doubling crystal 13 and remaining fundamental frequency light 18 are through two-sided fundamental frequency light and the frequency doubled light anti-reflection film of all plating of lens 14() behind the collimation, separate mirror 15(plating 45 degree frequency doubled light anti-reflection films and fundamental frequency light high-reflecting films by first harmonic again) and second harmonic Separator lens 16(plate fundamental frequency light high-reflecting film) be split up into frequency doubling green light laser 19 and the basic frequency laser 20 of parallel output.
The specific design example is as follows: place laser each several part device according to Fig. 1 in light path, comprise total reflective mirror 6, chamber mirror 5, outgoing mirror 7, laser crystal 8, acousto-optic Q modulation switch 9, coupled system 3 and 4; The focal length of the lens 3 of coupled system is 15mm, and the focal length of lens 4 is 30mm; Total reflective mirror 6 is 150mm to the distance at laser crystal 8 centers, chamber mirror 5 is 20mm to the distance at laser crystal center, outgoing mirror 7 is 130mm to the distance at chamber mirror 5 centers, the angle angle of " V " die cavity two arms is 18 degree, coupled system light output end (centers, rear surface of second lens 4) is 30mm apart from the distance at laser crystal 8 centers, and pump light 18 is 0.8mm through the averaged focus spot diameter of coupled system in laser crystal 8.Theoretical according to thermal lens, when the pump power of laser crystal absorption was 22W, its equivalent heat focal length of lens was about about 170mm; Utilize the beam transformation matrix law, can calculate when equivalent cavity is long and be 300mm, when the thermal lens that laser crystal 8 produces was positioned at the center of equivalent cavity, the average basic mode diameter of vibration fundamental frequency light 18 in crystal 8 was 0.73mm, approached with the average diameter of pump light 17 in crystal 8.Then place acousto-optic Q modulation switch, the oscillation threshold in modulating resonance chamber in the position near total reflective mirror 6; Under this condition, it is better to access output beam quality---and beam quality factor is less than 1.3, and the quasi-continuous lasing pulse of stable output power is exported.The pulsed base frequency laser 18 of output changes transmission path and plays the effect that increases light path through the first deviation mirror 10 and the second deviation mirror 11, be that to place focal length be the condenser lens 12 of 50mm at the 350mm place in distance outgoing mirror 7 actual optical path length, be that 1.3 basic frequency laser 18 focusing transform are that beam waist diameter is about the 0.07mm focused beam with beam quality factor, beam waist position is the incident end face place of the non-linear frequency-doubling crystal 13 of 10mm in length.According to the beam transformation matrix law, the beam waist position Range Focusing lens 12 after the conversion are about 56mm.According to the computing formula of above-mentioned Rayleigh range, when the wavelength X of basic frequency laser 18 is 1064nm, nonlinear crystal 13-LBO is that the refractive index n of the laser of 1064nm is about 1.6, beam quality factor M to wavelength X
2Be 1.3, the waist radius w of basic frequency laser 18 after focusing on
0Be 0.07mm, then the Rayleigh range of focused beam in non-linear frequency-doubling crystal 13 is 17.8mm, greater than the length of frequency-doubling crystal 13.
Obviously, those skilled in the art can carry out various changes and modification to the utility model and not break away from spirit and scope of the present utility model.Like this, if of the present utility model these are revised and modification belongs within the scope of the utility model claim and equivalent technologies thereof, then the utility model also is intended to comprise these changes and modification interior.
The content that is not described in detail in this specification belongs to the known prior art of this area professional and technical personnel.
Claims (7)
1. end pumping green light laser capable of regulating Q cavity external frequency multiplication initiatively, comprise laser pumping source (1), laser energy-transmission optic fibre (2), optical coupling system, laserresonator, laser crystal (8), active Q-switch (9), the first deviation mirror (10), the second deviation mirror (11), condenser lens (12), frequency-doubling crystal (13), collimating lens (14), first harmonic Separator lens (15), second harmonic Separator lens (16), it is characterized in that: optical coupling system is comprised of first lens (3) and second lens (4), first lens (3) collimate to the pump light (17) of laser energy-transmission optic fibre (2) output, second lens (4) focus on pump light (17), and the distance between first lens (3) and second lens (4) is adjustable; Laserresonator is " V " type refrative cavity structure, and its light path becomes " V " shape, consists of along basic frequency laser (18) optical routing total reflective mirror (6), chamber mirror (5) and outgoing mirror (7); Laser crystal (8) and active Q-switch (9) are placed in the laserresonator, and the first deviation mirror (10), the second deviation mirror (11), condenser lens (12), frequency-doubling crystal (13), collimating lens (14), first harmonic separate mirror (15), second harmonic separates mirror (16) and is placed on outside the laserresonator; The pump light (17) that is produced by laser pumping source (1) is by the collimation focusing of laser energy-transmission optic fibre (2) and optical coupling system, and it is inner and by fully absorption of laser crystal (8) that the chamber mirror (5) that passes through again " V " type refrative cavity corner incides laser crystal (8); Then the oscillation threshold of laserresonator forms the basic frequency laser (18) of pulse output by active Q-switch (9) modulation that is placed in the resonant cavity; Basic frequency laser (18) is through outgoing mirror (7) output, adjust incident direction through the first deviation mirror (10) and the second deviation mirror (11) again, focus on the incident end face of frequency-doubling crystal (13) and produce frequency doubling green light laser (19) and remaining basic frequency laser (18) passes through collimating lens (14) again and collimates by the condenser lens (12) that is arranged on the outer certain position of laserresonator, frequency doubling green light laser (19) sees through first harmonic and separates mirror (15) output, remaining basic frequency laser (18) is separated mirror (15) by first harmonic and second harmonic Separator lens (16) reflects, formation can with the basic frequency laser (20) of the parallel output of frequency doubling green light laser (19); Described total reflective mirror (6) is 140mm to 160mm to the distance at laser crystal (8) center, the center of chamber mirror (5) is 10mm to 30mm to the distance at laser crystal (8) center, outgoing mirror (7) is 120mm to 140mm to the distance at chamber mirror (5) center, lens (4) light output end center is 20mm to 40mm to the distance at laser crystal (8) center, and the two arm angles of " V " die cavity are less than 20 degree.
2. end pumping according to claim 1 green light laser capable of regulating Q cavity external frequency multiplication initiatively, it is characterized in that: total reflective mirror (6) is 150mm to laser crystal (8) centre distance.
3. end pumping according to claim 1 green light laser capable of regulating Q cavity external frequency multiplication initiatively, it is characterized in that: chamber mirror (5) is 20mm to laser crystal (8) centre distance.
4. end pumping according to claim 1 green light laser capable of regulating Q cavity external frequency multiplication initiatively, it is characterized in that: outgoing mirror (7) is 130mm to the distance at chamber mirror (5) center.
5. end pumping according to claim 1 green light laser capable of regulating Q cavity external frequency multiplication initiatively, it is characterized in that: the output end face center of second lens (4) is 30mm to the distance at laser crystal (8) center.
6. end pumping according to claim 1 green light laser capable of regulating Q cavity external frequency multiplication initiatively, it is characterized in that: two arm angles of " V " type refrative cavity are 18 degree.
7. end pumping according to claim 1 green light laser capable of regulating Q cavity external frequency multiplication initiatively, it is characterized in that: laser crystal (8) is positioned at the center of equivalent cavity structure.
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| CN2012202344359U CN202651614U (en) | 2012-05-23 | 2012-05-23 | End face pumping active Q-adjusting outside-cavity frequency multiplication green light laser |
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| CN2012202344359U CN202651614U (en) | 2012-05-23 | 2012-05-23 | End face pumping active Q-adjusting outside-cavity frequency multiplication green light laser |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108899753A (en) * | 2018-08-21 | 2018-11-27 | 深圳市格镭激光科技有限公司 | A kind of end face uniform pumping solid state laser |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108899753A (en) * | 2018-08-21 | 2018-11-27 | 深圳市格镭激光科技有限公司 | A kind of end face uniform pumping solid state laser |
| CN108899753B (en) * | 2018-08-21 | 2024-04-02 | 深圳市格镭激光科技有限公司 | End-face uniform pumping solid laser |
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Denomination of utility model: End-face pump green light laser capable of regulating Q cavity external frequency multiplication actively Effective date of registration: 20141226 Granted publication date: 20130102 Pledgee: Wuhan rural commercial bank Limited by Share Ltd Optics Valley branch Pledgor: Wuhan Lingyun Photoelectric Science & Technology Co., Ltd. Registration number: 2014990001136 |
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Date of cancellation: 20150327 Granted publication date: 20130102 Pledgee: Wuhan rural commercial bank Limited by Share Ltd Optics Valley branch Pledgor: Wuhan Lingyun Photoelectric Science & Technology Co., Ltd. Registration number: 2014990001136 |
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