CN103368049B - A kind of laser resonator structure of applicable periodical poled crystal high power frequency multiplication - Google Patents
A kind of laser resonator structure of applicable periodical poled crystal high power frequency multiplication Download PDFInfo
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- CN103368049B CN103368049B CN201310299020.9A CN201310299020A CN103368049B CN 103368049 B CN103368049 B CN 103368049B CN 201310299020 A CN201310299020 A CN 201310299020A CN 103368049 B CN103368049 B CN 103368049B
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Abstract
The invention discloses a kind of laser resonator structure of applicable periodical poled crystal high power frequency multiplication, it comprises the first son vibration chamber and the second son vibration chamber, be placed with period 1 polarized crystal in its first son vibration chamber, in the second son vibration chamber, be placed with polarized crystal second round; Wherein, the fundamental frequency light in laser resonant cavity respectively described first son vibration chamber and second son vibration chamber in vibrate, with reduce to period 1 polarized crystal and second round polarized crystal damage.By the laser power higher than lens lesion threshold value, share in two son vibration chambeies, make the laser power density in two son vibration chambeies can be less than lens lesion threshold value, two son vibration chamber frequencys multiplication respectively, the frequency doubled light in final two son vibration chambeies to unite two into one output from outgoing mirror, makes employing periodical poled crystal carry out frequency multiplication and obtains higher power and become possibility.
Description
Technical field
The present invention relates to laser technology field, particularly relate to a kind of laser resonator structure of applicable periodical poled crystal high power frequency multiplication.
Background technology
The development of Modern Optics Technology, proposes the higher requirement of renewal to laser.Widen laser output wavelength scope, one of the most frequently used, most effective method, utilizes the frequency transform techniques of nonlinear crystal exactly.Along with the maturation of cyclic polarization technique, the period polarized quasi-nonlinear crystal being applicable to frequency multiplication engenders, it is large and without advantages such as walk-off effects that these crystal have effective nonlinear coefficient.
Periodical poled crystal common at present has PPLN, PPMgLN, PPLT etc., wherein, periodically poled lithium niobate crystal (PPLN) because of its effective nonlinear coefficient large, wide through spectral region, be easy to growth, low price, physical and chemical performance is stablized, and not easily the advantage such as deliquescence has become one of application nonlinear material widely.But lithium columbate crystal easily produces light injury under strong laser irradiation, its threshold for resisting laser damage is low, cannot realize high-power frequency multiplication, and this has become its major obstacle as high power frequency doubling device of restriction.The method of current solution problems, still mainly take to improve material itself, the method of MgO is mixed as by height, the ability of the photodamage resistant of lithium columbate crystal material can be improved, overcome the shortcoming of its photo-damage resistance difference to a certain extent, but compared with traditional nonlinear crystal (as LBO), its antibody Monoclonal ability is still on the low side.
In current technology, life cycle polarized crystal carries out intracavity frequency doubling, and the laser resonator structure usually adopted as shown in Figure 1, comprise pumping source 111, orthopedic systems 121, laser crystal 131, periodical poled crystal 141, resonant cavity total reflective mirror 151, resonant cavity outgoing mirror 152.Total reflective mirror 151 plates the high-reflecting film of fundamental frequency light and frequency doubled light, and outgoing mirror 152 plates the high-reflecting film of fundamental frequency light and the high transmittance film of frequency doubled light.During work, the pump light of pumping source 111 outgoing, through orthopedic systems 121, inject laser crystal 131, excited fluorescence radiation is produced after laser crystal 131 absorptive pumping light energy, because total reflective mirror 151 and outgoing mirror 152 plate to this wavelength the film that is all-trans, light oscillate in the resonant cavity that total reflective mirror 151 and outgoing mirror 152 form of excited fluorescence radiation, forms stable fundamental frequency light after amplifying.When fundamental frequency light is by periodical poled crystal 141, frequency multiplication effect occurs, a part of fundamental frequency light is converted into frequency doubled light, because total reflective mirror 151 pairs of frequency doubled lights are high anti-, outgoing mirror 152 is thoroughly high to it, and the frequency doubled light produced in chamber finally exports from outgoing mirror 152.This traditional intracavity frequency doubling laser resonator structure, fundamental frequency light whole in chamber is acted on periodical poled crystal, frequency doubled light power output is improved if now want, then pump energy can be improved, thus fundamental frequency light power in chamber is raised, but in chamber, the power density of fundamental frequency light is once bring up to more than periodical poled crystal damage threshold, and crystal possibly light injury occurs and cannot use.
Summary of the invention
For the problems referred to above, the object of the invention there are provided a kind of laserresonator, for sharing the power density of fundamental frequency light in chamber to a certain extent, superpose the power of frequency doubled light simultaneously, thus avoid the light injury of periodical poled crystal, make to utilize the fundamental frequency light power density higher than periodical poled crystal damage threshold to realize high power frequency multiplication and ensured.
Concrete thought is as follows:
In common intracavity frequency doubling laserresonator, insert a kind of special eyeglass, thus the power of laser resonance cavity total is divided into two parts, form two sub-chambeies.In these two sub-chambeies, each one-period polarized crystal that inserts carries out frequency multiplication, and frequency doubled light is produced in these two sub-chambeies, and the frequency doubled light that final two sub-chambeies produce exports from same outgoing mirror, the power superposition of two parts light.The method makes the fundamental frequency light power reduction by each periodical poled crystal, thus avoids crystal to produce light injury, but the frequency doubled light power raising that laser is overall.
According to an aspect of the present invention, the laser resonator structure of a kind of applicable periodical poled crystal high power frequency multiplication that the present invention proposes, it comprises the first son vibration chamber and the second son vibration chamber, be placed with period 1 polarized crystal in its first son vibration chamber, in the second son vibration chamber, be placed with polarized crystal second round; Wherein, the fundamental frequency light in laser resonant cavity respectively described first son vibration chamber and second son vibration chamber in vibrate, with reduce to period 1 polarized crystal and second round polarized crystal damage.The present invention compared with prior art, outstanding advantages is: common laserresonator, and when fundamental frequency light power density in chamber is greater than the damage threshold of non-linear cycle polarization frequency-doubling crystal, light injury appears in nonlinear crystal, not only make crystal damage, and efficient double-frequency laser cannot be obtained.Mode of the present invention, cleverly by the laser power higher than lens lesion threshold value, share in two son vibration chambeies, make the laser power density in two son vibration chambeies can be less than lens lesion threshold value, two son vibration chamber respectively frequencys multiplication, the frequency doubled light in final two son vibration chambeies to unite two into one output from outgoing mirror.Make employing periodical poled crystal carry out frequency multiplication to obtain higher power and become possibility.
Accompanying drawing explanation
Fig. 1 is traditional intracavity frequency doubling laser resonator structure schematic diagram.
Fig. 2 is the laser resonator structure schematic diagram being applicable to periodical poled crystal high power frequency multiplication in the present invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly understand, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in further detail.
Fig. 2 shows the laser resonator structure schematic diagram of a kind of applicable periodical poled crystal high power frequency multiplication that the present invention proposes.As shown in Figure 2, this laser resonator structure comprises: pumping source 211, orthopedic systems 221, laser crystal 231, period 1 polarized crystal 241, second round polarized crystal 242, resonant cavity total reflective mirror 251, resonant cavity insert mirror 252 resonant cavity outgoing mirror 253.
In the course of work, the pump light of pumping source 211 outgoing, through orthopedic systems 221, produces the hot spot of uniform convergence, enters laser crystal 231.Excited fluorescence radiation is produced after laser crystal 231 absorptive pumping light energy, light oscillate in resonant cavity of excited fluorescence radiation amplifies the stable fundamental frequency light of rear formation, when fundamental frequency light passes through periodical poled crystal 241,242, there is frequency multiplication effect, a part of fundamental frequency light is converted into frequency doubled light.Wherein, resonant cavity total reflective mirror 251 resonant cavity outgoing mirror 253 two lens set resonant cavity integrally, resonant cavity inserts mirror 252, overall resonance chamber is divided into two son vibration chambeies, thus resonant cavity total reflective mirror 251, resonant cavity insertion mirror 252 forms son vibration chamber 10, resonant cavity inserts mirror 252, resonant cavity outgoing mirror 253 forms the sub chamber 20 that vibrates; Place respectively in son vibration chamber 10 and 20 period 1 polarized crystal 241 and second round polarized crystal 242.
Wherein, the anti-reflection film of laser crystal 231 both ends of the surface plating fundamental frequency light and frequency doubled light, resonant cavity total reflective mirror 251, as total reflective mirror, adopts the level crossing of plating pump light anti-reflection film, fundamental frequency light and frequency doubled light high-reflecting film; Resonant cavity outgoing mirror 253, as outgoing mirror, adopts the level crossing of plating fundamental frequency light high-reflecting film and frequency doubled light anti-reflection film; Resonant cavity inserts the separation mirror of mirror 252 as two sub-chambeies, adopt plating fundamental frequency light component permeate film and the level crossing of frequency doubled light anti-reflection film, the transmitance T=20% of wherein said component permeate film, 30%, 40% or 50% (reflectivity about 80%, 70%, 60% or 50%); First, second periodical poled crystal 241,242 described is the two block period polarized crystals that parameter is identical, is placed on resonant cavity respectively and inserts the placement of mirror 252 both sides, be namely placed in two sub-chambeies respectively, the anti-reflection film of its both ends of the surface plating fundamental frequency light and frequency doubled light.
In sub-oscillator 10, except returning the fundamental frequency light of sub-oscillator 10, when transmitance is 20%, also have 20% fundamental frequency light through, enter son vibration chamber 20, via periodical poled crystal 242, be partially consumed, arrive outgoing mirror 253 and all reflect, be back to eyeglass 252 place, the former road of fundamental frequency light still having 80% reflects, between eyeglass 252 and 253, form laser generation.For being back to eyeglass 252 place, except returning the fundamental frequency light in son vibration chamber 20, separately there is the light transmission of 20%, reflecting again via arriving total reflective mirror 251 after each device, between mirror 251 and 253, forming laser generation equally.
Thus in this resonant cavity, fundamental frequency light can think that sub-fraction is vibrated between eyeglass 251 and 253, another major part is split in be vibrated in son vibration sub-chamber, 20 two, chamber that chambeies 10 and 252,253 forms by 251,252 sons that form vibrates, therefore in order to improve frequency doubled light power output, then pump energy can be improved, although now in chamber, fundamental frequency light power raises, in chamber, fundamental frequency light is split in two sub-chambeies and vibrates, and therefore can reduce the damage to each periodical poled crystal.
Through periodical poled crystal 241,242 time, there is frequency multiplication effect in fundamental frequency light, consumes part of fundamental light, produces frequency doubled light.The frequency doubled light produced in son vibration chamber 10, a part directly through eyeglass 252 all through, another part changes its traffic direction after being reflected by eyeglass 251, then via eyeglass 252 through, two parts export along outgoing mirror direction; The frequency doubled light that son vibration chamber 20 produces, a part directly exports from outgoing mirror, separately has small part to enter into son vibration chamber 10, reflects, finally export along outgoing mirror 253 direction via total reflective mirror 251.The frequency doubled light of two son vibration chamber generations finally merges output from same outgoing mirror 253.
Wherein the wavelength of pumping source 211 is 808nm, maximum pump Pu power 30W, and 200 μm of coupling fibers export; Pump light orthopedic systems 221 is 1: 1 pump light orthopedic systems, arrives laser crystal 231, spot radius about 200 μm after pump light is focused on; Laser crystal 231 is Nd:YVO
4laser crystal, is of a size of 3 × 3 × 5mm
3, a axle cuts, doping content 0.5%; Described fundamental frequency light and frequency doubled light wavelength are respectively 1064nm and 532nm; First, second periodical poled crystal 241,242 is PPLN or PPMgLN crystal, is of a size of 1 × 1 × 2mm
3.
In intracavity frequency doubling laserresonator common in prior art, two chamber mirrors (total reflective mirror and outgoing mirror) of its resonant cavity all reflect fundamental frequency light, all reflect, outgoing mirror is high thoroughly to frequency doubled light total reflective mirror.And by inserting fundamental frequency light component permeate, insertion eyeglass that frequency doubled light is anti-reflection in the present invention, make to a fundamental frequency light part through, another part former road reflection, thoroughly high to frequency doubled light.
In the such scheme that the present invention proposes, for the fundamental frequency light that former road is reflected, can be reflected back when arriving a chamber mirror, when being reflected back into insertion eyeglass, still have part light to be reflected back, therefore this part light just defines laser generation between insertion mirror and a chamber mirror.
For through the fundamental frequency light of going, be reflected back when arriving another chamber mirror, when again arriving insertion eyeglass, still have the Guang Beiyuan road reflection of part, part light transmission goes, and therefore this part light reflected will form laser generation between insertion mirror and this chamber mirror.
For this part through the light gone, can be reflected by chamber mirror, each to arrive when inserting eyeglass will component permeate, then reflects to another chamber mirror.
Anti-reflection to frequency doubled light owing to inserting eyeglass, making to comprise the frequency doubled light produced in the son vibration chamber of total reflective mirror, completely by inserting eyeglass, finally can export from outgoing mirror, the frequency doubled light that the sub-chamber of another part produces exports from outgoing mirror equally, and two parts frequency doubled light finally unites two into one.
Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. a laser resonator structure for applicable periodical poled crystal high power frequency multiplication, it comprises the first son vibration chamber and the second son vibration chamber, is placed with period 1 polarized crystal in its first son vibration chamber, is placed with polarized crystal second round in the second son vibration chamber;
Wherein, the fundamental frequency light in laser resonant cavity respectively described first son vibration chamber and second son vibration chamber in vibrate, with reduce to period 1 polarized crystal and second round polarized crystal damage; And
Described first son vibration chamber and the second son vibration chamber are inserted mirror by resonant cavity and are separated, and described resonant cavity inserts mirror for plating fundamental frequency light component permeate film and frequency doubled light high transmittance film.
2. laser resonator structure as claimed in claim 1, it is characterized in that, the transmitance of described fundamental frequency light component permeate film is 20% ~ 50%.
3. laser resonator structure as claimed in claim 1, is characterized in that, described first son vibration one end, chamber is resonant cavity total reflective mirror, and described resonant cavity total reflective mirror is coated with pump light anti-reflection film, fundamental frequency light and frequency doubled light high-reflecting film.
4. laser resonator structure as claimed in claim 1, is characterized in that, described second son vibration one end, chamber is resonant cavity outgoing mirror, and described laser outgoing mirror is coated with fundamental frequency light high-reflecting film and frequency doubled light anti-reflection film.
5. laser resonator structure as claimed in claim 1, it is characterized in that, described fundamental frequency light produces as follows: after the pump light of pumping source outgoing enters laser crystal, produce excited fluorescence radiant light, after this excited fluorescence radiant light enters described first son vibration chamber and the second son vibration chamber from the input of described laser resonator structure, oscillate forms fundamental frequency light after amplifying.
6. laser resonator structure as claimed in claim 1, it is characterized in that, there is frequency multiplication effect by period 1 polarized crystal and second round after polarized crystal in described fundamental frequency light, produce frequency doubled light, described frequency doubled light exports from the output of described laser resonator structure.
7. laser resonator structure as claimed in claim 1, is characterized in that, described period 1 polarized crystal and second round polarized crystal be PPLN or PPMgLN crystal.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2320839C (en) * | 1997-10-08 | 2002-07-23 | Uniphase Corporation | High efficiency intracavity doubled laser and method |
| DE19836712B4 (en) * | 1998-08-13 | 2008-02-21 | Carl Zeiss Meditec Ag | Frequency-doubled, diode-pumped solid-state lasers |
| CN101304152A (en) * | 2008-06-30 | 2008-11-12 | 山东大学 | Coupled resonator self-Raman multiple frequency complete solid yellow light laser |
| CN201234055Y (en) * | 2008-06-30 | 2009-05-06 | 山东大学 | Coupling cavity type Raman frequency doubling completely solid yellow light laser |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2320839C (en) * | 1997-10-08 | 2002-07-23 | Uniphase Corporation | High efficiency intracavity doubled laser and method |
| DE19836712B4 (en) * | 1998-08-13 | 2008-02-21 | Carl Zeiss Meditec Ag | Frequency-doubled, diode-pumped solid-state lasers |
| CN101304152A (en) * | 2008-06-30 | 2008-11-12 | 山东大学 | Coupled resonator self-Raman multiple frequency complete solid yellow light laser |
| CN201234055Y (en) * | 2008-06-30 | 2009-05-06 | 山东大学 | Coupling cavity type Raman frequency doubling completely solid yellow light laser |
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