CN101752781A - Blue-green laser crystal module used in wide temperature range - Google Patents

Abstract

The invention relates to the design and the preparation of a blue-green laser crystal module used in wide temperature range. The invention has the key content that the nonlinear crystal used for the blue-green laser crystal module is cut not according to only one phase matching angle but according to the subsequent temperature range of the working environment of the blue-green laser crystal module and different phase matching angles which correspond to different temperature of the nonlinear crystal, and the cut nonlinear crystals are connected in series to be used in wider temperature range than the signal nonlinear crystal. The whole adjustment-free blue-green laser crystal module has simple design, compact structure and low cost, does not need any refrigeration or temperature control system and is suitable for large-scale production. The adjustment-free blue-green laser crystal module can be used without making any adjustment to the laser crystal, the nonlinear crystal and the resonant cavity, can directly emit light under the irradiation a semiconductor pump and is easy to use and change. The blue-green laser crystal module is expected to be widely used for the middle and small-power blue-green lasers and especially used under the military, scientific research and other conditions with poor use environment.

Description

Indigo plant, green laser crystal module that a kind of wide temperature range uses

Technical field

What the present invention relates to is indigo plant, the green laser crystal module design that a kind of wide temperature range uses, and relates to the preparation of crystal module, the invention belongs to laser technology field.

Technical background

General indigo plant, the structure of green laser crystal module are as shown in Figure 1, Fig. 1 (a) illustrates the general basic structure of exempting from the adjustable type green laser crystal module, comprising: optical thin film A 101, laser crystal 102, the nonlinear crystal 103 of single phase matched angle cutting, optical thin film B104.Fig. 1 (b) illustrates the basic structure of general separate type blue laser crystal module, comprising: optical thin film A 111, laser crystal 112, the nonlinear crystal 113 of single phase matched angle cutting, optics outgoing mirror 114, optical thin film B 115.Because the phase matching angle of nonlinear crystal changes with the environment for use variations in temperature, the crystal that mates the angle cutting according to particular phases is after the ambient temperature change, and its coupling angle also changes thereupon, thereby causes the reduction more or less of crystal double frequency efficient.And all nonlinear crystals all have maximum separately to allow displacement angle δ θ, and the change that causes phase matching angle when the variations in temperature of crystal can cause the phase mismatch of nonlinear crystal during greater than its maximum displacement angle of permission δ θ.So the laser crystal module of said structure has limited the range of application and the job stability of device greatly not freezing or can only normally not using under the condition of temperature control in a very little temperature range.

Summary of the invention

The present invention relates to the indigo plant that a kind of wide temperature range uses, the design and the preparation of green laser crystal module, it comprises separate type and exempts from the blue light of adjustable type and green laser crystal module totally four classes.

Separate type blue laser crystal module is by Nd:YVO4, Nd:YAG, other laser crystal such as Nd:GdVO4, the nonlinear crystal of the same race of two or more coupling angle cuttings is connected in series, as LBO, BBO, BIBO, KN, CBO, other nonlinear crystal such as PPLN, can also add adjusting Q crystal in the chamber, average or plano-concave optics outgoing mirror and be coated on laser crystal and resonant cavity that the optical thin film on optics outgoing mirror surface is formed constitutes, its modular structure is: optical thin film (1)/laser crystal/nonlinear crystal/optics outgoing mirror/optical thin film (2), or optical thin film (1)/laser crystal/nonlinear crystal/adjusting Q crystal/optics outgoing mirror/optical thin film (2); Exempting from adjustable type blue laser crystal module is by other laser crystals such as Nd:YVO4, Nd:YAG, Nd:GdVO4, the nonlinear crystal of the same race of two or more coupling angle cuttings is connected in series, as other nonlinear crystal such as LBO, BBO, BIBO, KN, CBO, PPLN and be coated on the resonant cavity that the optical thin film of two planes of crystal forms and constitute, its modular structure is: optical thin film (1)/laser crystal/nonlinear crystal/optical thin film (2), or optical thin film (1)/laser crystal/passive Q-adjusted crystal/nonlinear crystal/optical thin film (2).The logical optical cross-section of described laser and nonlinear crystal can be square or rectangle or circle, and length requires cutting according to reality.

The separate type green laser crystal module is by Nd:YVO4, Nd:GdVO4, Nd:YAG, other laser crystal such as Nd:KGW, the nonlinear crystal of the same race of two or more coupling angle cuttings is connected in series, as KTP, RTP, LBO, LN, KN, CBO, other nonlinear crystal such as PPLN, can select in the chamber and add adjusting Q crystal, average or plano-concave optics outgoing mirror and be coated on laser crystal and resonant cavity that the optical thin film on optics outgoing mirror surface is formed constitutes, its modular structure is: optical thin film (1)/laser crystal/nonlinear crystal/optics outgoing mirror/optical thin film (2), or optical thin film (1)/laser crystal/nonlinear crystal/adjusting Q crystal/optics outgoing mirror/optical thin film (2); Exempting from the adjustable type green laser crystal module is by Nd:YVO4, Nd:GdVO4, Nd:YAG, other laser crystal such as Nd:KGW, the nonlinear crystal of the same race of two or more coupling angle cuttings is connected in series, as KTP, RTP, LBO, LN, KN, CBO, other nonlinear crystal such as PPLN and the resonant cavity formation that is coated on the optical thin film composition of two planes of crystal, its modular structure is: optical thin film (1)/laser crystal/nonlinear crystal/optical thin film (2), or optical thin film (1)/laser crystal/passive Q-adjusted crystal/nonlinear crystal/optical thin film (2).The logical optical cross-section of described laser and nonlinear crystal can be square or rectangle or circle, and length requires cutting according to reality.

Core design content of the present invention is that the used nonlinear crystal of crystal module is not single by a phase matched angle cutting, but press the out of phase matching angle cutting of crystal different temperatures correspondence according to crystal module operating ambient temperature range in the future, and on demand the use of being connected in series of the crystal of well cutting, connected mode can be to separate fixing or gummed or optical cement or bonding, to reach than using the wideer serviceability temperature of monolithic nonlinear crystal.

The lbo crystal of two classes coupling cutting at normal temperatures 25 degrees centigrade the time two frequency multiplication phase matched angles from 1064nm to 532nm be θ=20.9 ° as calculated,

And the maximum of LBO when two frequencys multiplication of 1064nm allows displacement angle δ θ to be

$\mathrm{\δ\θ}=\frac{\mathrm{\λ}}{l}{[n_0\left(2\mathrm{\ω}\right)-n_e\left(2\mathrm{\ω}\right)]}^{-1}{\sin }^{-1}2{\mathrm{\θ}}_m,---\left(1\right)$

In the formula, λ is fundamental frequency light wavelength 1064nm, and l gets 1cm, θ for frequency-doubling crystal length _mBe the phase matching angle that calculates by theory, bring formula (1) into and calculate θ=10.86mrad=0.623 ° of the maximum displacement angle of permission δ that corresponding two phase matching angle critical values are θ=20.3 °,

And θ=21.5 °,

The corresponding temperature that draws by conversion is 18 degrees centigrade and 32 degrees centigrade.That is to say to be that the working temperature of monolithic lbo crystal of 25 degrees centigrade of 1064nm, two frequencys multiplication, two class phase matching angles cuttings should be controlled at 18-32 degree centigrade, exceed this temperature range frequency multiplication effect and will receive and have a strong impact on, thereby limit its scope of application and condition greatly.

If on corresponding two the phase matching angle critical values of monolithic nonlinear crystal again ± δ θ, two new phase matching angle critical values are θ=19.7 °,

And θ=22.1 °,

Optional two phase matching angles in this scope, such as selecting θ=19.8 °,

And θ=22 °, The crystal of cutting and θ=20.9 that begin most °,

Crystal together three be connected in series, those two new phase matching angle critical values are θ=19.2 °,

And θ=22.6 °,

By converting to such an extent that the critical working temperature of the crystal module that makes new advances is 5-45 degree centigrade.Monocrystal 18-32 degree centigrade operating temperature range is greatly improved before the ratio, thereby has increased the range of application of crystal module and reduced its service condition restriction.

The present invention also relates to the indigo plant that a kind of wide temperature range uses, the preparation method of green laser crystal module, i.e. fixing, optical cement between the orientation of crystal, cutting, polishing, plated film and crystal, bonding, bonding technique.

Below in conjunction with accompanying drawing patent of the present invention is described further.

Description of drawings

Fig. 1 (a) is the general basic structure schematic diagram of exempting from the adjustable type green laser crystal module.

Fig. 1 (b) is the basic structure schematic diagram of general separate type blue laser crystal module.

The basic structure schematic diagram of exempting from the adjustable type green laser crystal module that Fig. 2 (a) cuts and is cascaded by two coupling angles for patent nonlinear crystal of the present invention.

Fig. 2 (b) is the basic structure schematic diagram of patent nonlinear crystal of the present invention by three separate type green laser crystal modules that mate the angles cutting and be cascaded.

Fig. 3 (a) is the basic structure schematic diagram of patent nonlinear crystal of the present invention by two separate types active modulation Q green laser crystal modules that mate the angles cutting and be cascaded.

The basic structure schematic diagram of exempting from the passive Q-adjusted green laser crystal module of adjustable type that Fig. 3 (b) cuts and is cascaded by two coupling angles for patent nonlinear crystal of the present invention.

The basic structure schematic diagram of exempting from adjustable type blue laser crystal module that Fig. 4 (a) cuts and is cascaded by three coupling angles for patent nonlinear crystal of the present invention.

Fig. 4 (b) is the basic structure schematic diagram of patent nonlinear crystal of the present invention by two separate type blue laser crystal modules that mate the angles cutting and be cascaded.

Embodiment

The execution mode of exempting from the adjustable type green laser crystal module that nonlinear crystal cuts and is cascaded by two coupling angles in example 1 patent of the present invention is referring to Fig. 2 (a).This embodiment comprises: laser crystal 202, and crystal can be other laser crystals such as Nd:YVO4, Nd:GdVO4, Nd:YAG, Nd:KGW; Be coated with optical thin film A 201 on the pump light incident end face of laser crystal 202, its film is that 808nm is anti-reflection, and 1064nm and 532nm are high anti-; The logical light end face of another of described laser crystal is close to the nonlinear crystal 203 that cuts and be connected in series by two coupling angles, between laser crystal and nonlinear crystal and two nonlinear crystals can be gummed or optical cement or bonding, and nonlinear crystal 203 can be KTP, RTP, LBO, LN, KN, CBO, PPLN etc.; Be coated with optical thin film B 204 on the logical light end face of another of described nonlinear crystal, its film is that 532nm is anti-reflection, and 1064nm is high anti-.

Nonlinear crystal is by the execution mode of three separate type green laser crystal modules that mate the angles cutting and be cascaded, referring to Fig. 2 (b) in example 2 patents of the present invention.This embodiment comprises: laser crystal 212, and crystal can be other laser crystals such as Nd:YVO4, Nd:GdVO4, Nd:YAG, Nd:KGW; Be coated with optical thin film A 211 on the pump light incident end face of laser crystal 212, its film is that 808nm is anti-reflection, and 1064nm and 532nm are high anti-; The nonlinear crystal 213 that the logical light end face of another of described laser crystal is being connected in series and is cutting and be connected in series by three coupling angles, between laser crystal and nonlinear crystal and three nonlinear crystals can be to separate fixing or gummed or optical cement or bonding, and nonlinear crystal 213 can be KTP, RTP, LBO, LN, KN, CBO, PPLN etc.; The another side of described nonlinear crystal has an average or plano-concave optics outgoing mirror 214, is coated with optical thin film B 215 on the plane of the close nonlinear crystal side of optics outgoing mirror or the concave surface, and its film is that 532nm is anti-reflection, and 1064nm is high anti-.

Example 3 patent nonlinear crystals of the present invention are by the execution mode of two separate types active modulation Q green laser crystal modules that mate the angles cutting and be cascaded, referring to Fig. 3 (a).This embodiment comprises: laser crystal 302, and crystal can be other laser crystals such as Nd:YVO4, Nd:GdVO4, Nd:YAG, Nd:KGW; Be coated with optical thin film A 301 on the pump light incident end face of laser crystal 302, its film is that 808nm is anti-reflection, and 1064nm and 532nm are high anti-; The nonlinear crystal 303 that the logical light end face of another of described laser crystal is being connected in series and is cutting and be connected in series by two coupling angles, between laser crystal and nonlinear crystal and two nonlinear crystals can be to separate fixing or gummed or optical cement or bonding, and nonlinear crystal 303 can be KTP, RTP, LBO, LN, KN, CBO, PPLN etc.; The another side of described nonlinear crystal has an active Q-switch 304, and described Q-switch can be electrooptical switching or acoustooptic switch etc.; Initiatively Q-switch has an average or plano-concave optics outgoing mirror 305 outward, is coated with optical thin film B 306 on the plane of the close Q-switch side of optics outgoing mirror or the concave surface, and its film is that 532nm is anti-reflection, and 1064nm is high anti-.

The execution mode of exempting from the passive Q-adjusted green laser crystal module of adjustable type that example 4 patent nonlinear crystals of the present invention cut and are cascaded by two coupling angles is referring to Fig. 3 (b).This embodiment comprises: laser crystal 312, and crystal can be other laser crystals such as Nd:YVO4, Nd:GdVO4, Nd:YAG, Nd:KGW; Be coated with optical thin film A 311 on the pump light incident end face of laser crystal 312, its film is that 808nm is anti-reflection, and 1064nm and 532nm are high anti-; The logical light end face of another of described laser crystal is close to the nonlinear crystal 313 that cuts and be connected in series by two coupling angles, between laser crystal and nonlinear crystal and two nonlinear crystals can be gummed or optical cement or bonding, and nonlinear crystal 313 can be KTP, RTP, LBO, LN, KN, CBO, PPLN etc.; The another side of described nonlinear crystal has a passive Q-adjusted crystal 3 14, can be gummed or optical cement or bonding between passive Q-adjusted crystal and the nonlinear crystal; Be coated with optical thin film B 315 on the logical light end face of another of described passive Q-adjusted crystal, its film is that 532nm is anti-reflection, and 1064nm is high anti-.

The execution mode of exempting from adjustable type blue laser crystal module that example 5 patent nonlinear crystals of the present invention cut and are cascaded by three coupling angles is referring to Fig. 4 (a).This embodiment comprises: laser crystal 402, and crystal can be for other laser crystals such as Nd:YVO4, Nd:YAG, Nd:GdVO4, here to use the Nd:YAG crystal to be example; Be coated with optical thin film A 401 on the pump light incident end face of laser crystal Nd:YAG,, its film is that 808nm is anti-reflection, 946nm and 473nm are high anti-; The logical light end face of another of described laser crystal is close to the nonlinear crystal 403 that cuts and be connected in series by three coupling angles, between laser crystal and nonlinear crystal and three nonlinear crystals can be gummed or optical cement or bonding, and nonlinear crystal 403 can be LBO, BBO, BIBO, KN, CBO, PPLN etc.; Be coated with optical thin film B 404 on the logical light end face of another of described nonlinear crystal, its film is that 473nm is anti-reflection, and 946nm is high anti-.

Example 6 patent nonlinear crystals of the present invention are by the execution mode of two separate type blue laser crystal modules that mate the angles cutting and be cascaded, referring to Fig. 4 (b).This embodiment comprises: laser crystal 412, and crystal can be for other laser crystals such as Nd:YVO4, Nd:YAG, Nd:GdVO4, here to use the Nd:YAG crystal to be example; Be coated with optical thin film A 411 on the pump light incident end face of laser crystal Nd:YAG,, its film is that 808nm is anti-reflection, 946nm and 473nm are high anti-; The logical light end face of another of described laser crystal is close to the nonlinear crystal 413 that cuts and be connected in series by two coupling angles, between laser crystal and nonlinear crystal and two nonlinear crystals can be to separate fixing or gummed or optical cement or bonding, and nonlinear crystal 413 can be LBO, BBO, BIBO, KN, CBO, PPLN etc.; The another side of described nonlinear crystal has an average or plano-concave optics outgoing mirror 414, is coated with optical thin film B 415 on the plane of the close nonlinear crystal side of optics outgoing mirror or the concave surface, and its film is that 473nm is anti-reflection, and 946nm is high anti-.

Claims (7)

1. the indigo plant, the green laser crystal module that use of a wide temperature range, it is characterized in that: this module is divided into separate type and exempts from two kinds of adjustable types.Separate type is by laser crystal, nonlinear crystal, optics outgoing mirror and be coated on laser crystal and resonant cavity that the optical thin film on optics outgoing mirror surface is formed constitutes, can also add adjusting Q crystal in the chamber, its modular structure is: optical thin film (1)/laser crystal/nonlinear crystal/optics outgoing mirror/optical thin film (2), or optical thin film (1)/laser crystal/nonlinear crystal/adjusting Q crystal/optics outgoing mirror/optical thin film (2); Exempt from adjustable type by laser crystal, nonlinear crystal and be coated on the resonant cavity that two plane of crystal optical thin films form and constitute, can also add passive Q-adjusted crystal in the chamber, its modular structure is: optical thin film (1)/laser crystal/nonlinear crystal/optical thin film (2), or optical thin film (1)/laser crystal/passive Q-adjusted crystal/nonlinear crystal/optical thin film (2).

2. the indigo plant, the green laser crystal module that use of a wide temperature range, it is characterized in that: the used nonlinear crystal of module is not single by a phase matched angle cutting, but press the out of phase matching angle cutting of crystal different temperatures correspondence according to crystal module operating ambient temperature range in the future, and on demand the use of being connected in series of the crystal of well cutting, connected mode can be to separate fixing or gummed or optical cement or bonding.

3. require indigo plant, the green laser crystal module of described a kind of wide temperature range use as right 1, it is characterized in that: the optics outgoing mirror in the separate type crystal module can be average mirror, also can be the plano-concave mirror.

4. require indigo plant, the green laser crystal module of described a kind of wide temperature range use as right 1, it is characterized in that: the laser crystal and the nonlinear crystal of exempting from the adjustable type crystal module are to be connected in series, and connected mode can be to separate fixing or gummed or optical cement or bonding.

5. require indigo plant, the green laser crystal module of described a kind of wide temperature range use as right 1, it is characterized in that: the logical optical cross-section of laser and nonlinear crystal can be square or rectangle or circle, and length requires cutting according to reality.

6. require indigo plant, the green laser crystal module of described a kind of wide temperature range use as right 1, it is characterized in that: for the green light crystal module, laser crystal can be other laser crystal and corresponding membrane systems such as Nd:YVO4, Nd:GdVO4, Nd:YAG, Nd:KGW; Nonlinear crystal can be other nonlinear crystal and corresponding membrane systems such as KTP, RTP, LBO, LN, KN, CBO, PPLN.

7. require indigo plant, the green laser crystal module of described a kind of wide temperature range use as right 1, it is characterized in that: for the blue light crystal module, laser crystal can be other laser crystal and corresponding membrane systems such as Nd:YVO4, Nd:YAG, Nd:GdVO4; Nonlinear crystal can be other nonlinear crystal and corresponding membrane systems such as LBO, BBO, BIBO, KN, CBO, PPLN.

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