CN204464748U - The passive Q-adjusted ultraviolet laser of a kind of separate type - Google Patents
The passive Q-adjusted ultraviolet laser of a kind of separate type Download PDFInfo
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- CN204464748U CN204464748U CN201520146614.0U CN201520146614U CN204464748U CN 204464748 U CN204464748 U CN 204464748U CN 201520146614 U CN201520146614 U CN 201520146614U CN 204464748 U CN204464748 U CN 204464748U
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Abstract
The utility model discloses the passive Q-adjusted ultraviolet laser of a kind of separate type.The passive Q-adjusted ultraviolet laser of this separate type comprises pumping system, it is characterized in that, described pumping system is also coupled with the laser head being separated setting with it, and described laser head comprises the collimating mirror of optical coupling, focus lamp, resonant cavity, two frequency-doubling crystals and frequency tripling crystal successively; Described pumping system comprises pumping source, powers, provides temperature controlled drive source for two frequency-doubling crystals and frequency tripling crystal to pumping source; Described pumping source is by energy-transmission optic fibre and described collimating mirror optical coupling.The utility model can reduce volume, facilitate installation and maintenance.
Description
Technical field
The utility model relates to laser technology field, the passive Q-adjusted ultraviolet laser of espespecially a kind of separate type.
Background technology
Since laser comes out, laser processing technology is just subject to people's attention, and laser processing technology has become the important component part of advanced manufacturing technology so far.Due to laser beam have that monochromaticjty is good, energy density is high, space controlling and the series of advantages such as time controling is good, it is widely used in the fields such as materials processing at present, be directed to Laser Micro-Machining, the laser in the fields such as material marking mainly contains infrared laser, green (light) laser, ultraviolet laser.But existing laser is comparatively complicated, the main green glow of acousto-optic or electric-optically Q-switched infrared solid laser and nonlinear frequency transformation thereof and the ultraviolet laser of adopting realizes, and cost is also higher.
Patent documentation CN103633536A disclosed the technical scheme of the integrated pump head of a kind of laser head for 03 month on the 12nd in 2014.The utility model relating to laser technology field equally then discloses a kind of passive Q-regulaitng laser, comprise pumping source, pumping coupling system, the first gain crystal, the second gain crystal and saturable absorber, pumping source sends pump light and enters the first gain crystal and the second gain crystal through pumping coupling system, saturable absorber is placed in after the second gain crystal, by saturable absorber, laser is modulated, thus produce pulse laser output.
Existing ultraviolet laser that is passive Q-adjusted or actively Q-switched generally is integrated form design, integrates by pumping source and laser head.Such integrated form passive Q-regulaitng laser volume is comparatively large, and cost is high, and safeguard and use all inconvenient, and the laser head partial volume of the actively Qswitched laser of separate type is also larger, the device also more complicated of actively Q-switched, cost is high.
Summary of the invention
The passive Q-adjusted ultraviolet light of separate type that the utility model provides a kind of to be reduced volume, facilitate installation and maintenance.
The purpose of this utility model is achieved through the following technical solutions:
The passive Q-adjusted ultraviolet laser of a kind of separate type, comprise pumping system and laser head, described pumping system is separated with laser head, and described laser head comprises the collimating mirror of optical coupling, focus lamp, resonant cavity, two frequency-doubling crystals and frequency tripling crystal successively; Described pumping system comprises pumping source, to the drive source that pumping source is powered; Described pumping source is by energy-transmission optic fibre and described collimating mirror optical coupling.
Further, described drive source, pumping source are installed in pumping system, are an entirety; Described collimating mirror, focus lamp, resonant cavity, two frequency-doubling crystals and frequency tripling crystal are integrated in same housing, and described housing is also fixed with the beam expanding lens with the optical coupling of described frequency tripling crystal outward; Beam expanding lens be coated with have infrared light and two frequency doubled lights high anti-, the film system anti-reflection to ultraviolet light.
Further, described resonant cavity, from focus lamp side, comprises the speculum of optical coupling, gain component, passive Q-adjusted crystal and outgoing mirror successively; The resonant cavity be made up of speculum and outgoing mirror is stable cavity; The exiting surface of described outgoing mirror is coupled with described two frequency-doubling crystals.
Further, described gain component comprises the second gain crystal adopting the first gain crystal of isotropic, high upper level lifetime and high energy storage material and employing to possess polarization characteristic material; Described first gain crystal and the second gain crystal optical coupling.
Further, described first gain crystal is the bonding of Nd:YAG crystal or Nd:YAG ceramic crystal or YAG and Nd:YAG or the crystal of gummed, and the second gain crystal is the bonding of Nd:YVO4 crystal or YVO4 and Nd:YVO4 or the crystal of gummed; Or, first gain crystal is the bonding of Nd:YVO4 crystal or YVO4 and Nd:YVO4 or the crystal of gummed, second gain crystal is the bonding of Nd:YAG crystal or Nd:YAG ceramic crystal or YAG and Nd:YAG or the crystal of gummed, and the exiting surface of the first gain crystal is less than 10mm at a distance of the incidence surface distance of the second gain crystal.
Further, described first gain crystal is Nd:YAG crystal, the doping content of its Nd ion is 0.2%-2%, second gain crystal is Nd:YVO4 crystal, the doping content of its Nd ion is 0.1%-3%, or the first gain crystal is that the doping content of its Nd ion of Nd:YVO4 crystal is for being 0.1%-2%, first gain crystal (10) is Nd:YAG crystal, and the doping content of its Nd ion is 0.2%-3%.
Further, described passive Q-adjusted crystal is any one in Cr:YAG, V:YAG, semiconductor saturated absorbing body, Graphene, and the initial transmission of passive Q-adjusted crystal is 10%-95%.
Further, in described speculum, outgoing mirror, at least one is concave mirror; Or the incidence surface plated film of described first gain crystal, forms described speculum; Described outgoing mirror is concave mirror.
Further, described two frequency-doubling crystals are lbo crystal, ktp crystal, bbo crystal, BiBO crystal, clbo crystal, PPLN crystal, matching way can adopt critical phase matched or noncritical phase matching, frequency tripling crystal is lbo crystal, bbo crystal, BiBO crystal, clbo crystal, KDP crystal, and matching way can adopt critical phase matched or noncritical phase matching.
Further, described pumping source is continuous semiconductor laser or impulse semiconductor laser, and when pumping source is the impulse semiconductor laser of coupling fiber output, its centre wavelength is 808nm ± 5nm, the combination of one or more any two kinds of wavelength in 880nm ± 5nm, 885nm ± 5nm; Laser housing volume is less than 80x80x430mm
3, its cross-sectional area is less than 80x80mm
2, length is less than 430mm
3.
A kind of ultraviolet laser as passive Q-adjusted in separate type described in the utility model, comprises step:
Pumping system sends pump light outputs to laser head collimating mirror by energy-transmission optic fibre;
Produce population inversion by the first gain crystal and the second gain crystal, spontaneous radiation occurs;
Speculum and outgoing mirror composition resonant cavity feedback effect under, produce stimulated radiation;
Pulsed infrared laser is produced under the effect of passive Q-adjusted crystal;
Export pulsed infrared laser by outgoing mirror, then produce the ultraviolet laser of single wavelength through two frequency-doubling crystals and frequency tripling crystal.
Pumping system of the present utility model and laser housing adopt separation design, and pumping system is connected with laser housing energy-transmission optic fibre, make the volume of laser head smaller and more exquisite like this, more compact structure; And laser head is separated formation independent accessory with pumping, also facilitate separate repair, replacing, be convenient to settle using and later maintenance.In addition, the utility model adopts passive Q-adjusted design, reduces the cost of laser, has better stability.
Accompanying drawing explanation
Fig. 1 is the principle schematic of the passive Q-adjusted ultraviolet laser of the utility model embodiment one separate type;
Fig. 2 is the principle schematic of the two passive Q-adjusted ultraviolet laser of gain crystal compact of the utility model;
Fig. 3 is principle first schematic diagram of the various flat-concave cavity passive Q-regulaitng laser of the utility model;
Fig. 4 is principle second schematic diagram of the various flat-concave cavity passive Q-regulaitng laser of the utility model;
Fig. 5 is principle the 3rd schematic diagram of the various flat-concave cavity passive Q-regulaitng laser of the utility model;
Fig. 6 is principle the 4th schematic diagram of the various flat-concave cavity passive Q-regulaitng laser of the utility model;
Fig. 7 is the principle schematic that the utility model embodiment eight adopts the passive Q-regulaitng laser of high temperature angle automatching nonlinear crystal;
Fig. 8 is the principle schematic of a kind of passive Q-adjusted ultraviolet laser of the utility model;
Fig. 9 is the curve synoptic diagram of the spot radius in chamber, existing average chamber with the change of thermal focal length;
Figure 10 is the curve synoptic diagram of the spot radius in the utility model flat-concave cavity chamber with the change of thermal focal length.
Wherein:
1, pumping system; 11, drive source; 12, pumping source; 2, energy-transmission optic fibre; 3, laser head; 4, housing; 5, beam expanding lens; 6, collimating mirror; 7, focus lamp; 8, resonant cavity; 81, speculum; 82, gain component; 821, the first gain crystal; 822, the second gain crystal; 83, passive Q-adjusted crystal; 84, outgoing mirror; 86, part reflective semitransparent film; 9, nonlinear crystal; 91, two frequency-doubling crystals; 92, frequency tripling crystal.
Embodiment
Embodiment one
As shown in Figure 1, present embodiment discloses the passive Q-adjusted ultraviolet laser of a kind of separate type, comprise pumping system 1, described pumping system 1 is also coupled with the laser head 3 being separated setting with it, and described laser head 3 comprises the collimating mirror 6 of optical coupling, focus lamp 7, resonant cavity 8, two frequency-doubling crystal 91 and frequency tripling crystal 92 successively; Described pumping system 1 comprises pumping source 12, powers and provide refrigeration, provide temperature controlled drive source 11 for two frequency-doubling crystals 91 and frequency tripling crystal 92 to pumping source 12; Described pumping source 12 is by energy-transmission optic fibre 2 and the optical coupling of described collimating mirror 6.
Present embodiment is open a kind of ultraviolet laser as passive Q-adjusted in separate type described in the utility model also, comprises step:
Pumping system sends pump light outputs to laser head collimating mirror by energy-transmission optic fibre;
Produce population inversion by the first gain crystal and the second gain crystal, spontaneous radiation occurs;
Speculum and outgoing mirror composition resonant cavity feedback effect under, produce stimulated radiation;
Pulsed infrared laser is produced under the effect of passive Q-adjusted crystal;
Export pulsed infrared laser by outgoing mirror, then produce the ultraviolet laser of single wavelength through two frequency-doubling crystals and frequency tripling crystal.
Pumping system 1 of the present utility model adopts separation design with laser housing 4, and pumping system 1 is connected with laser housing 4 energy-transmission optic fibre 2, makes the volume of laser head 3 smaller and more exquisite like this, more compact structure; And laser head 3 is separated formation independent accessory with pumping, also facilitate separate repair, replacing, be convenient to settle using and later maintenance.In addition, the utility model adopts passive Q-adjusted design, reduces the cost of laser, has better stability.
Embodiment two
As shown in Figure 8, present embodiment discloses the passive Q-adjusted ultraviolet laser of a kind of separate type, comprise pumping system 1, described pumping system 1 is also coupled with the laser head 3 being separated setting with it, and described laser head 3 comprises the collimating mirror 6 of optical coupling, focus lamp 7, resonant cavity 8, two frequency-doubling crystal 91 and frequency tripling crystal 92 successively; Described pumping system 1 comprises pumping source 12, powers and provide refrigeration, provide temperature controlled drive source 11 for two frequency-doubling crystals 91 and frequency tripling crystal 92 to pumping source 12; Described pumping source 12 is by energy-transmission optic fibre 2 and the optical coupling of described collimating mirror 6.Described two frequency-doubling crystals 91 are lbo crystal, ktp crystal, bbo crystal, BiBO crystal, clbo crystal, PPLN crystal, matching way can adopt critical phase matched or noncritical phase matching, frequency tripling crystal 92 is lbo crystal, bbo crystal, BiBO crystal, clbo crystal, KDP crystal, and matching way can adopt critical phase matched or noncritical phase matching.
Described drive source 11, pumping source 12 are installed in pumping system 1, are an entirety; Described collimating mirror 6, focus lamp 7, resonant cavity 8, two frequency-doubling crystal 91 and frequency tripling crystal 92 are integrated in same housing 4, and described housing 4 is outer is also fixed with the beam expanding lens 5 with the optical coupling of described frequency tripling crystal 92; Beam expanding lens 5 is coated with to be had to infrared light height instead, the film system anti-reflection to ultraviolet light.
Described resonant cavity 8, from focus lamp 7 side, comprises the speculum 81 of optical coupling, gain component 82, passive Q-adjusted crystal 83 and outgoing mirror 84 successively; The resonant cavity 8 be made up of speculum 81 and outgoing mirror 84 is stable cavity; The exiting surface of described outgoing mirror 84 is coupled with described two frequency-doubling crystals 91.Described gain component 82
Described passive Q-adjusted crystal 83 is any one in Cr:YAG, V:YAG, semiconductor saturated absorbing body, Graphene, and the initial transmission of passive Q-adjusted crystal 83 is 10%-95%.
In described speculum 81, outgoing mirror 84, at least one is concave mirror; Or the incidence surface plated film of described gain component 82, forms described speculum 81; Described outgoing mirror 84 is concave mirror.Specifically, the resonant cavity 8 that speculum 81 and outgoing mirror 84 are formed is stable cavity, and speculum 81 is concave mirror, and outgoing mirror 84 is level crossing; Or speculum 81 is level crossing outgoing mirror 84 is concave mirror; Or speculum 81 is concave mirror, outgoing mirror 84 is concave mirror; Or speculum 81 is replaced by the left side plated film of gain component 82, and outgoing mirror 84 is concave mirror, specifically see shown in Fig. 3-6.
Described pumping source 12 is continuous semiconductor laser or impulse semiconductor laser, when the impulse semiconductor laser that pumping source 12 exports for coupling fiber, its centre wavelength is the combination of one or more any two kinds of wavelength in 808nm ± 5nm, 880nm ± 5nm, 885nm ± 5nm; Energy-transmission optic fibre 2 length is greater than 50cm, and laser housing 4 volume is less than 80x80x430mm
3, its cross-sectional area is less than 80x80mm
2, length is less than 430mm
3, pumping system 1 is air-cooled with the type of cooling of laser head 3.
Embodiment three
As shown in Figure 2, disclosed in present embodiment, ultraviolet laser comprises: pumping system 1, energy-transmission optic fibre 2, laser head 3, and laser head 3 comprises laser housing 4; Be integrated with collimating mirror 6 in laser housing 4, focus lamp 7, speculum 81, the first gain crystal 821, second gain crystal 822, passive Q-adjusted crystal 83, outgoing mirror 84, two frequency-doubling crystals 91, frequency tripling crystal 92, and be integrated in the beam expanding lens 5 outside housing 4.
Pumping system 1 is made up of drive source 11 and pumping source 12, drive source 11 is powered for pumping source 12, pumping source 12 sends pump light, through energy-transmission optic fibre 2, after collimating mirror 6 and focus lamp 7, pumping is carried out to the first gain crystal 821 and the second gain crystal 822, first gain crystal 821 and the second gain crystal 822 produce population inversion, there is spontaneous radiation, under the feedback effect of the resonant cavity 8 formed at speculum 81 and outgoing mirror 84, produce stimulated radiation, pulsed infrared laser is produced under the effect of passive Q-adjusted crystal 83, laser is exported by outgoing mirror 84, pulsed infrared laser produces ultraviolet laser by two frequency-doubling crystals 91 and frequency tripling crystal 92 and exports, the laser exported collimates through beam expanding lens 5, beam expanding lens 5 is coated with to be had to infrared light height instead, the film system anti-reflection to ultraviolet light, the ultraviolet laser of final output single wavelength.
The volume of pumping system 1 is 293mmx195mmx95mm, inner installation drive source 11 and pumping source 12 drive source 11 have the constant current output of a road voltage adaptive, export with two-way temperature control, be respectively pumping source 12 and electric energy is provided, for pumping source 12 provides refrigeration, for two frequency-doubling crystals 91 and frequency tripling crystal 92 provide accurate temperature to control, the power output of pumping source 12 is 30W, when temperature is 25 DEG C, its centre wavelength is 808nm, the pump light that pumping source 12 exports is 2.5m by a length, core diameter 400um, numerical aperture be 0.22 energy-transmission optic fibre 2 to be transferred to laser housing 4 inner, the volume of laser housing 4 is 48mmx48mmx170mm, optical fiber with metal armor as protective sleeve, the diameter of protective sleeve is 7mm, pump light focuses in the first gain crystal 821 and the second gain crystal 822 through collimating mirror 6 and focus lamp 7, pumping is carried out to the first gain crystal 821 and the second gain crystal 822, the radius of curvature of speculum 81 is 5000mm, be coated with the film system that 808nm is thoroughly high and 1064nm height is anti-, passive Q-adjusted crystal 83 is Cr:YAG crystal, its small-signal transmitance is 83%, the transmitance of outgoing mirror 84 is 25%, two frequency-doubling crystals 91 and frequency tripling crystal 92 adopt the lbo crystal of critical phase place matching way, wherein the cutting angle of two frequency-doubling crystals 91 is for being (° Φ=10.9 °, θ=90), the cutting angle of frequency tripling crystal 92 is (° Φ=90 °, θ=43.9), when the pump power that pumping source 12 exports is 25W, the infrared fundamental frequency light power now exported is 9.2W, the green laser of 1.8W and the infrared fundamental frequency light of residue of 7.1W is obtained after two frequency-doubling crystals 91, the 355nm ultraviolet laser finally obtaining 1.5W after frequency tripling crystal 92 exports, after beam expanding lens 5, after filtering remaining infrared fundamental frequency light and green glow, obtaining the angle of divergence is 1.2mrad, power is that the ultraviolet laser of 1.3W exports.If no special instructions, the operation principle of present embodiment, the parameter of each parts is applicable to all ultraviolet laser of following examples.
Embodiment four
As shown in Figure 2, the open a kind of two passive Q-adjusted ultraviolet laser of gain crystal compact of present embodiment, comprise pumping system 1, described pumping system 1 is also coupled with the collimating mirror 6 of optical coupling successively, focus lamp 7, resonant cavity 8, two frequency-doubling crystal 91 and frequency tripling crystal 92; Described pumping system 1 comprises pumping source 12, powers and provide refrigeration, provide temperature controlled drive source 11 for two frequency-doubling crystals 91 and frequency tripling crystal 92 to pumping source 12; Described resonant cavity 8, from focus lamp 7 side, comprises the speculum 81 of optical coupling successively, adopts the first gain crystal 821 of isotropic, high upper level lifetime and high energy storage material, adopts the second gain crystal 822, passive Q-adjusted crystal 83 and the outgoing mirror 84 that possess polarization characteristic material; The resonant cavity 8 be made up of speculum 81 and outgoing mirror 84 is stable cavity; The exiting surface of described outgoing mirror 84 is coupled with described two frequency-doubling crystals 91.Described pumping source 12 is by energy-transmission optic fibre 2 and the optical coupling of described collimating mirror 6.Pumping system 1 is air-cooled with the type of cooling of laser head 3.
Described drive source 11, pumping source 12 are installed in pumping system 1, are an entirety; Described collimating mirror 6, focus lamp 7, resonant cavity 8, two frequency-doubling crystal 91 and frequency tripling crystal 92 are integrated in same housing 4, and described housing 4 is outer is also fixed with the beam expanding lens 5 with the optical coupling of described frequency tripling crystal 92; Beam expanding lens 5 is coated with to be had to infrared light height instead, the film system anti-reflection to ultraviolet light.
Described first gain crystal 821 is the bonding of Nd:YAG crystal or Nd:YAG ceramic crystal or YAG and Nd:YAG or the crystal of gummed, and the second gain crystal 822 is the bonding of Nd:YVO4 crystal or YVO4 and Nd:YVO4 or the crystal of gummed; Or, first gain crystal 821 is the bonding of Nd:YVO4 crystal or YVO4 and Nd:YVO4 or the crystal of gummed, second gain crystal 822 is the bonding of Nd:YAG crystal or Nd:YAG ceramic crystal or YAG and Nd:YAG or the crystal of gummed, and the exiting surface of the first gain crystal 821 is less than 10mm at a distance of the incidence surface distance of the second gain crystal 822.
Described first gain crystal 821 is Nd:YAG crystal, the doping content of its Nd ion is 0.2%-2%, second gain crystal 822 is Nd:YVO4 crystal, the doping content of its Nd ion is 0.1%-3%, or, first gain crystal 821 is the doping content of its Nd ion of Nd:YVO4 crystal is 0.1%-2%, and the first gain crystal 821 (10) is Nd:YAG crystal, and the doping content of its Nd ion is 0.2%-3%.
Described passive Q-adjusted crystal 83 is any one in Cr:YAG, V:YAG, semiconductor saturated absorbing body, Graphene, and the initial transmission of passive Q-adjusted crystal 83 is 10%-95%.
In described speculum 81, outgoing mirror 84, at least one is concave mirror.Specifically, the resonant cavity 8 that speculum 81 and outgoing mirror 84 are formed is stable cavity, and speculum 81 is concave mirror, and outgoing mirror 84 is level crossing; Or speculum 81 is level crossing outgoing mirror 84 is concave mirror; Or speculum 81 is concave mirror, outgoing mirror 84 is concave mirror; Or speculum 81 is replaced by the left side plated film of the first gain crystal 821, and outgoing mirror 84 is concave mirror, specifically see shown in Fig. 3-6.
Described two frequency-doubling crystals 91 are lbo crystal, ktp crystal, bbo crystal, BiBO crystal, clbo crystal, PPLN crystal, matching way can adopt critical phase matched or noncritical phase matching, frequency tripling crystal 92 is lbo crystal, bbo crystal, BiBO crystal, clbo crystal, KDP crystal, and matching way can adopt critical phase matched or noncritical phase matching.
Energy-transmission optic fibre 2 length is greater than 50cm, and laser housing 4 volume is less than 80x80x430mm
3, its cross-sectional area is less than 80x80mm
2, length is less than 430mm
3.Described pumping source 12 is continuous semiconductor laser or impulse semiconductor laser, when the impulse semiconductor laser that pumping source 12 exports for coupling fiber, its centre wavelength is the combination of one or more any two kinds of wavelength in 808nm ± 5nm, 880nm ± 5nm, 885nm ± 5nm.
Embodiment five
As shown in Fig. 1,8, present embodiment discloses a kind of flat-concave cavity passive Q-regulaitng laser, comprise pumping system 1, with collimating mirror 6, focus lamp 7, the resonant cavity 8 of pumping system 1 successively optical coupling, described resonant cavity 8, from focus lamp 7 side, comprises the speculum 81 of optical coupling, gain component 82, passive Q-adjusted crystal 83 and outgoing mirror 84 successively; Described outgoing mirror 84 exiting surface is coupled with nonlinear crystal 9 and beam expanding lens 5 successively; Described pumping system 1 comprises pumping source 12, powers and provide refrigeration, provide temperature controlled drive source 11 for nonlinear crystal 9 to pumping source 12; In described speculum 81, outgoing mirror 84, at least one is concave mirror.In general, the long scope in chamber of laser is 10mm-300mm, if be the origin of coordinates with concave mirror, its scope should be 0-L/2, and L is that chamber is long.
Realize the concave surface mirror of above-mentioned speculum 81, outgoing mirror 84, including, but not limited to under type:
Scheme one, as shown in Figure 3, the incidence surface plated film of described first gain crystal 821, forms described speculum 81; Described outgoing mirror 84 is concave mirror.
Scheme two, as shown in Figure 4, described speculum 81 is concave mirror, and outgoing mirror 84 is level crossing.
Scheme three, as shown in Figure 5, described speculum 81 is level crossing, and outgoing mirror 84 is concave mirror.
Scheme four, as shown in Figure 6, described speculum 81 and outgoing mirror 84 are concave mirror.
If laser is ultraviolet laser.Described gain component 82 comprises the second gain crystal 822 adopting the first gain crystal 821 of isotropic, high upper level lifetime and high energy storage material and employing to possess polarization characteristic material; Described first gain crystal 821 and the second gain crystal 822 optical coupling.
Described first gain crystal 821 is the bonding of Nd:YAG crystal or Nd:YAG ceramic crystal or YAG and Nd:YAG or the crystal of gummed, and the second gain crystal 822 is the bonding of Nd:YVO4 crystal or YVO4 and Nd:YVO4 or the crystal of gummed; Or, first gain crystal 821 is the bonding of Nd:YVO4 crystal or YVO4 and Nd:YVO4 or the crystal of gummed, second gain crystal 822 is the bonding of Nd:YAG crystal or Nd:YAG ceramic crystal or YAG and Nd:YAG or the crystal of gummed, and the exiting surface of the first gain crystal 821 is less than 10mm at a distance of the incidence surface distance of the second gain crystal 822.Described passive Q-adjusted crystal 83 is any one in Cr:YAG, V:YAG, semiconductor saturated absorbing body, Graphene, and the initial transmission of passive Q-adjusted crystal 83 is 10%-95%.
Described nonlinear crystal 9, from outgoing mirror 84 side, comprises two frequency-doubling crystals 91 and frequency tripling crystal 92 successively; Described two frequency-doubling crystals 91 are lbo crystal, ktp crystal, bbo crystal, BiBO crystal, clbo crystal, PPLN crystal, matching way can adopt critical phase matched or noncritical phase matching, frequency tripling crystal 92 is lbo crystal, bbo crystal, BiBO crystal, clbo crystal, KDP crystal, and matching way can adopt critical phase matched or noncritical phase matching.
Described pumping source 12 is continuous semiconductor laser or impulse semiconductor laser, when the impulse semiconductor laser that pumping source 12 exports for coupling fiber, its centre wavelength is the combination of one or more any two kinds of wavelength in 808nm ± 5nm, 880nm ± 5nm, 885nm ± 5nm; Energy-transmission optic fibre 2 length is greater than 50cm, and laser housing 4 volume is less than 80x80x430mm
3, its cross-sectional area is less than 80x80mm
2, length is less than 430mm
3, pumping system 1 is air-cooled with the type of cooling of laser head 3.
If laser is ultraviolet laser, another embodiment can also be had.
Described first gain crystal 821 is described first gain crystal 821 is Nd:YAG crystal, the doping content of its Nd ion is 0.2%-2%, second gain crystal 822 is Nd:YVO4 crystal, the doping content of its Nd ion is 0.1%-3%, the length of Nd:YAG is 1mm-15mm, Nd:YVO4 crystal length is 1-15mm.Or the first gain crystal 821 is the doping content of its Nd ion of Nd:YVO4 crystal is 0.1%-2%, and the first gain crystal 821 (10) is Nd:YAG crystal, and the doping content of its Nd ion is 0.2%-3%;
Described passive Q-adjusted crystal 83 is any one in Cr:YAG, V:YAG, semiconductor saturated absorbing body, Graphene, and the initial transmission of passive Q-adjusted crystal 83 is 10%-95%;
Described nonlinear crystal 9, from outgoing mirror 84 side, comprises two frequency-doubling crystals 91 and frequency tripling crystal 92 successively; Described two frequency-doubling crystals 91 are lbo crystal, ktp crystal, bbo crystal, BiBO crystal, clbo crystal, PPLN crystal, matching way can adopt critical phase matched or noncritical phase matching, frequency tripling crystal 92 is lbo crystal, bbo crystal, BiBO crystal, clbo crystal, KDP crystal, and matching way can adopt critical phase matched or noncritical phase matching; Described pumping source 12 is continuous semiconductor laser or impulse semiconductor laser, when the impulse semiconductor laser that pumping source 12 exports for coupling fiber, its centre wavelength is the combination of one or more any two kinds of wavelength in 808nm ± 5nm, 880nm ± 5nm, 885nm ± 5nm; Energy-transmission optic fibre 2 length is greater than 50cm, and laser housing 4 volume is less than 80x80x430mm
3, its cross-sectional area is less than 80x80mm
2, length is less than 430mm
3, pumping system 1 is air-cooled with the type of cooling of laser head 3.
Embodiment six
As shown in Figure 7, present embodiment discloses a kind of passive Q-regulaitng laser adopting high temperature angle automatching nonlinear crystal, comprise pumping system 1, with collimating mirror 6, focus lamp 7, the resonant cavity 8 of pumping system 1 successively optical coupling, described resonant cavity 8, from focus lamp 7 side, comprises the speculum 81 of optical coupling, gain component 82, passive Q-adjusted crystal 83 and outgoing mirror 84 successively; Described outgoing mirror 84 exiting surface is coupled with nonlinear crystal 9 and beam expanding lens 5 successively, and the temperature that nonlinear crystal 9 mates is greater than room temperature.Preferably, the temperature that nonlinear crystal 9 mates is more than or equal to 40 DEG C, is less than or equal to 60 DEG C.Such as 45 DEG C, 48 DEG C, 52 DEG C, 55 DEG C, 57 DEG C etc.More excellent selection, the temperature that nonlinear crystal 9 mates equals 50 degree.
Nonlinear crystal is generally adopted and is mated in two ways.One is Temperature Matching, general refractive index has the nonlinear crystal of significant change to be suitable for Temperature Matching with temperature, Temperature Matching is very strict to the requirement of the control of temperature, general precision is less than +/-0.1 degree Celsius, and very multicrystal coupling temperature is higher, more than 150 degrees Celsius, need the temperature controlling stove that precision is higher, add cost.Another kind of nonlinear crystal matching way by contrast, namely angle automatching more for convenience, this matching way is the serviceability temperature first setting nonlinear crystal, then matching angle calculating is carried out according to this temperature, finally according to this matching angle, crystal is cut, the crystal cut out only uses at that temperature arranged before, efficiency could be the highest, the crystal that this mode is mated operationally uses more convenient, require also so not high to the control precision of temperature, therefore system is comparatively simple.
But angle automatching mode conventional in prior art, the phase matching angle of general crystal all adopts coupling room temperature, and (alleged by the application, room temperature refers to indoor temperature, there are differences according to territorial environment difference and generally refer to 25 DEG C) cutting mode, this mode has weak point:
First, the angle automatching nonlinear crystal that coupling room temperature cutting mode obtains operationally can need two-way temperature to control, and namely needs refrigeration when summer uses, needs heating, greatly add the complexity of system when winter uses.
Secondly, because laser is by during nonlinear crystal and when not having laser by nonlinear crystal, the temperature of this crystal has a greater change, and needs longer temperature equilibrium time, causes the energy shortage of first pulse train, makes processing effect unstable.When supposing that coupling temperature is 25 DEG C, it accepts temperature is +/-1 DEG C, only in this temperature range, the efficiency of its frequency multiplication is just higher, as temperature not this scope then shg efficiency can decline, when going out laser, laser can sharply rise through the temperature of nonlinear crystal part, such as rise to 40 DEG C, when not going out laser, its temperature can be reduced to rapidly 25 DEG C again, when at this moment going out laser and do not go out laser, temperature difference is larger, therefore laser is not being gone out to the temperature equilibrium time needing in a flash a section going out laser, first pulse train energy shortage can be caused during this period of time, response speed is slow, make processing effect unstable, and the temperature difference to be balanced at short notice, cause control circuit complicated, raise cost.The utility model adopts high temperature angle automatching mode then to solve the problems referred to above, such as, suppose the nonlinear crystal adopting high temperature angle automatching (for 50 DEG C of couplings), the cutting angle of this nonlinear crystal is (° Φ=10.9 °, θ=90), it accepts temperature is +/-1 DEG C, it is 51 DEG C when then going out laser, it is 49 DEG C when not going out laser, under avoiding room temperature match condition, temperature equilibrium time required for working temperature 50 DEG C is risen to and close to the optimum working temperature of nonlinear crystal from room temperature 25 DEG C, therefore adopt high temperature coupling time its go out laser and do not go out laser state differ less, nonlinear crystal can be allowed to enter optimum working temperature sooner, response speed is obviously accelerated, and thermoregulation range is little, also simplified control circuit is conducive to, reduce costs.Finally, to be improved the temperature of nonlinear crystal by the energy produced during nonlinear crystal due to laser can be taken full advantage of, therefore, adopt the mode of high temperature angle automatching can also reduce energy consumption further.
Embodiment seven
As shown in Figure 2, the open a kind of two passive Q-adjusted ultraviolet laser of first gain crystal compact of present embodiment, comprise pumping system 1, described pumping system 1 is also coupled with the collimating mirror 6 of optical coupling successively, focus lamp 7, resonant cavity 8, two frequency-doubling crystal 91 and frequency tripling crystal 92; Described pumping system 1 comprises pumping source 12, powers and provide refrigeration, provide temperature controlled drive source 11 for two frequency-doubling crystals 91 and frequency tripling crystal 92 to pumping source 12; Described resonant cavity 8, from focus lamp 7 side, comprises the speculum 81 of optical coupling successively, adopts the first gain crystal 821 of isotropic, high upper level lifetime and high energy storage material, adopts the second gain crystal 822, passive Q-adjusted crystal 83 and the outgoing mirror 84 that possess polarization characteristic material; The resonant cavity 8 be made up of speculum 81 and outgoing mirror 84 is stable cavity; The exiting surface of described outgoing mirror 84 is coupled with described two frequency-doubling crystals 91.
Technical schemes all at present all adopts one piece of crystal as the first gain crystal 821, as otherwise adopt the first gain crystal 821 (below for the analysis of Nd:YAG crystal) of isotropic, high upper level lifetime and high energy storage material, adopt the first gain crystal 821 (below for the analysis of Nd:YVO4 crystal) possessing polarization characteristic material, because Nd:YAG crystal is isotropic crystal, its fundamental frequency light exported does not have polarizability, thus make the efficiency of follow-up nonlinear frequency transformation lower, but Nd:YAG crystal upper level lifetime is long, energy storage is large, very high peak power can be obtained when passive Q-adjusted, although and adopt Nd:YVO4 crystal to have good polarization characteristic as the fundamental frequency light that the first gain crystal 821 is launched, but due to Nd:YVO4 crystal to be excited cross section large, upper level lifetime is shorter, energy storage is little, therefore under passive Q-adjusted situation, the peak power of the fundamental frequency light of launching is not high, this also have impact on the efficiency of its follow-up nonlinear frequency transformation, in order to make up the deficiency of two kinds of situations, the utility model adopts two first gain crystal 821 schemes being similar to Nd:YAG+Nd:YVO4, and both crystal have the absworption peak (808.5nm and 810nm) substantially identical to pump light, therefore single pumping source 12 is adopted can to meet pumping to two kind of first gain crystal 821, identical emission peak (1064nm), therefore adopt two first gain crystal 821 of the present utility model that the fundamental frequency light of transmitting can be made on the polarizing emission direction of Nd:YVO4 crystal to have obvious mode competition advantage, thus make the fundamental frequency light of output have good polarizability, because nonlinear crystal requires to be input as polarised light, therefore, this programme is more conducive to the operating efficiency improving nonlinear crystal.
Embodiment eight
As shown in Figure 7, the open flat-concave cavity passive Q-regulaitng laser of present embodiment, comprise pumping system 1, with collimating mirror 6, focus lamp 7, the resonant cavity 8 of pumping system 1 successively optical coupling, described resonant cavity 8, from focus lamp 7 side, comprises the speculum 81 of optical coupling, gain component 82, passive Q-adjusted crystal 83 and outgoing mirror 84 successively; Described outgoing mirror 84 exiting surface is coupled with nonlinear crystal 9 and beam expanding lens 5 successively; Described pumping system 1 comprises pumping source 12, powers and provide refrigeration, provide temperature controlled drive source 11 for nonlinear crystal 9 to pumping source 12; In described speculum 81, outgoing mirror 84, at least one is concave mirror.
What the speculum 81 of technical schemes all at present and outgoing mirror 84 all adopted is planar structure, and namely its resonant cavity 8 formed is average chamber.Figure 9 shows that, in average chamber, the spot radius in chamber is with the curve synoptic diagram of the change of thermal focal length; The chamber of this resonant cavity 8 is long is 70mm, and can find out when thermal focal changes to 80mm from 5000mm, the spot radius in chamber changes to 0.12mm from 0.42mm, and excursion is larger.And at least one is concave mirror in the utility model speculum 81, outgoing mirror 84, formation be flat-concave cavity, as shown in Figure 10, concave mirror R=500mm, chamber length is also 70mm, and the spot radius in chamber changes to 0.11mm from 0.25mm, its hot spot change of relatively average chamber is less, insensitive to thermal effect.The relation of thermal focal and pump power is as follows:
δP
in＝ηP
pump
Wherein η is thermal conversion rate, P
pumpfor pump power.
Above content is in conjunction with concrete preferred implementation further detailed description of the utility model, can not assert that concrete enforcement of the present utility model is confined to these explanations.For the utility model person of an ordinary skill in the technical field, without departing from the concept of the premise utility, some simple deduction or replace can also be made, all should be considered as belonging to protection range of the present utility model.
Claims (8)
1. the passive Q-adjusted ultraviolet laser of separate type, comprise pumping system, it is characterized in that, described pumping system is also coupled with the laser head being separated setting with it, and described laser head comprises the collimating mirror of optical coupling, focus lamp, resonant cavity, two frequency-doubling crystals and frequency tripling crystal successively; Described pumping system comprises pumping source, to the drive source that pumping source is powered; Described pumping source is by energy-transmission optic fibre and described collimating mirror optical coupling.
2. the passive Q-adjusted ultraviolet laser of separate type as claimed in claim 1, it is characterized in that, described drive source, pumping source are installed in pumping system, are an entirety; Described collimating mirror, focus lamp, resonant cavity, two frequency-doubling crystals and frequency tripling crystal are integrated in same housing; Described resonant cavity, from focus lamp side, comprises the speculum of optical coupling, gain component, passive Q-adjusted crystal and outgoing mirror successively; The resonant cavity be made up of speculum and outgoing mirror is stable cavity; The exiting surface of described outgoing mirror is coupled with described two frequency-doubling crystals.
3. the passive Q-adjusted ultraviolet laser of separate type as claimed in claim 2, it is characterized in that, described gain component comprises the second gain crystal adopting the first gain crystal of isotropic, high upper level lifetime and high energy storage material and employing to possess polarization characteristic material; Described first gain crystal and the second gain crystal optical coupling.
4. the passive Q-adjusted ultraviolet laser of separate type according to claim 3, it is characterized in that, described first gain crystal is the bonding of Nd:YAG crystal or Nd:YAG ceramic crystal or YAG and Nd:YAG or the crystal of gummed, and the second gain crystal is the bonding of Nd:YVO4 crystal or YVO4 and Nd:YVO4 or the crystal of gummed; Or, first gain crystal is the bonding of Nd:YVO4 crystal or YVO4 and Nd:YVO4 or the crystal of gummed, second gain crystal is the bonding of Nd:YAG crystal or Nd:YAG ceramic crystal or YAG and Nd:YAG or the crystal of gummed, and the exiting surface of the first gain crystal is less than 10mm at a distance of the incidence surface distance of the second gain crystal.
5. the passive Q-adjusted ultraviolet laser of separate type according to claim 2, it is characterized in that, described passive Q-adjusted crystal is any one in Cr:YAG, V:YAG, semiconductor saturated absorbing body, Graphene, and the initial transmission of passive Q-adjusted crystal is 10%-95%.
6. the passive Q-adjusted ultraviolet laser of separate type as claimed in claim 3, it is characterized in that, in described speculum, outgoing mirror, at least one is concave mirror; Or the incidence surface plated film of described first gain crystal, forms described speculum; Described outgoing mirror is concave mirror.
7. the passive Q-adjusted ultraviolet laser of separate type as claimed in claim 1, it is characterized in that, described two frequency-doubling crystals are lbo crystal, ktp crystal, bbo crystal, BiBO crystal, clbo crystal, PPLN crystal, matching way can adopt critical phase matched or noncritical phase matching, frequency tripling crystal is lbo crystal, bbo crystal, BiBO crystal, clbo crystal, KDP crystal, and matching way can adopt critical phase matched or noncritical phase matching.
8. the passive Q-adjusted ultraviolet laser of separate type according to claim 1, it is characterized in that, described pumping source is continuous semiconductor laser or impulse semiconductor laser, when pumping source is the impulse semiconductor laser of coupling fiber output, its centre wavelength is 808nm ± 5nm, the combination of one or more any two kinds of wavelength in 880nm ± 5nm, 885nm ± 5nm; Laser housing volume is less than 80x80x430mm3, and its cross-sectional area is less than 80x80mm2, and length is less than 430mm.
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| CN104701720A (en) * | 2015-03-13 | 2015-06-10 | 李斌 | Split type passively Q-switched UV-light laser device and laser generation method thereof |
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Effective date of registration: 20180521 Address after: 300000 room 266 and 273, science research west road, Nankai District, Tianjin (Science and Technology Park), 12 Patentee after: Laser Technology Co., Ltd.,Tianjin Maiman Address before: No. 54 red sun Road, Nankai District, Tianjin, Tianjin Co-patentee before: Sun Bing Patentee before: Li Bin |