CN101055969A - Non linear crystal dynamic heat dispersion device - Google Patents
Non linear crystal dynamic heat dispersion device Download PDFInfo
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- CN101055969A CN101055969A CN 200610105170 CN200610105170A CN101055969A CN 101055969 A CN101055969 A CN 101055969A CN 200610105170 CN200610105170 CN 200610105170 CN 200610105170 A CN200610105170 A CN 200610105170A CN 101055969 A CN101055969 A CN 101055969A
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Abstract
The invention relates to a nonlinear crystal dynamic cooling device, which includes a nonlinear crystal (1), a heat sink (2). The said nonlinear crystal (1) is placed in the heat sink (2), and the said nonlinear crystal (1) and the heat sink (2) are installed on a two-dimensional movement mechanism (3), which enables the heat sink (2) and the nonlinear crystal (1) in a motion state. The invention can effectively weaken the the impact of effects such as walk-off effect and birefringence effect induced by a non-uniform temperature rise in the clear direction when the nonlinear crystals are in polarization and frequency conversion in a tunable laser; improve the output power and the output beam quality of the tunable laser; and make the the tunable laser have characteristics such as a small size, a high efficiency, a compact structure, work safety, adaptability, and so on.
Description
Technical field
The present invention relates to a kind of non linear crystal dynamic heat dispersion device, the present invention is applied to tuned laser.
Background technology
From the ruby light beam that a branch of wavelength of human such as Franken in 1961 are 694.2nm had successfully carried out experiment that second harmonic produces by quartz crystal since, the output wavelength of utilizing the non-line effect of nonlinear crystal to carry out the frequency translation of light beam and tuned laser just became the focus of research.People use nonlinear crystal successfully to obtain ruddiness, gold-tinted, green glow, blue light, purple light equiwavelength's laser output from the laser.
Utilize nonlinear crystal to change the tuned laser output frequency, frequency conversion outside the chamber (Outer-cavityconverter technique) and intracavity frequency (Intracavity converter technique) dual mode is arranged.Frequency conversion has advantages such as adjusting flexibly, be easy to dismounting and maintenance outside the laser resonant cavity chamber, but have frequency conversion efficiency low, damage shortcoming such as nonlinear crystal easily.Adopt converter technique in the laser resonant cavity, because the fundamental frequency light of vibration has metastable mode profile and higher power density in the resonant cavity, nonlinear crystal is placed near the beam waist position of fundamental frequency light in the chamber, owing to improved laser power density required when nonlinear crystal polarizes, can make laser obtain higher harmonic conversion efficient, and the harmonic optcial beam that produces have characteristics such as the little and mode stable of the angle of divergence.
As everyone knows, no matter adopting the resonant cavity intracavity frequency still is frequency conversion outside the chamber, wants both to improve the laser harmonic output power, guarantees that again laser has harmonic optcial beam quality preferably, has bigger difficulty simultaneously.Its reason is: nonlinear crystal has absorbed laser energy when satisfying the phase-matching condition of non-linear coupling, could produce the frequency conversion effect that polarizes preferably.Yet nonlinear crystal absorbs laser energy and forms thermal source distribution heterogeneous in inside, and causes the non-homogeneous temperature rise in the local on the nonlinear crystal optical direction.Non-homogeneous temperature rise on the nonlinear crystal optical direction in the local makes the refractive index in this zone of nonlinear crystal change, and has just destroyed the intrinsic phase-matching condition of crystal, is called the thermal effect of nonlinear crystal.The thermal effect of nonlinear crystal is usually expressed as: the intrinsic phase-matching condition of one, nonlinear crystal is destroyed, causes the harmonic conversion efficient of crystal to reduce.Tuned laser output harmonic wave power descends, the beam quality variation; Two, the laser beam attribute by nonlinear crystal is changed, and causes that fundamental frequency light polarization state changes in the resonant cavity; Three, nonlinear crystal produces the hot focus effect to the laser that vibrates in the laserresonator, promptly is called the thermal lensing effect of nonlinear crystal.The thermal lensing effect of crystal can have influence on the stability of resonant cavity, the mode profile of endovenous laser.Therefore, eliminate and weaken the nonlinear crystal influence of thermal effect and become one of key factor that improves laser harmonic conversion efficient and output beam quality.
At present, the method that weakens the nonlinear crystal thermal effect in the tuned laser mostly is static radiating mode greatly, that is: heat sink according to the nonlinear crystal size design, with nonlinear crystal be placed in behind the indium film parcel heat sink in, the method by cooling heat sink keeps the nonlinear crystal peripheral temperature relatively stable.When the tuned laser steady running, nonlinear crystal and heat sink maintaining static thereof, the heat of nonlinear crystal generation is is mainly scattered and disappeared by crystal periphery and end face in the mode of heat conduction and thermal convection like this.
This static radiating mode of nonlinear crystal exists a lot of drawbacks, as: the nonlinear crystal pyroconductivity is low to cause the hot load in the crystal unit volume bigger, non-homogeneous temperature rise will cause nonlinear crystal to produce the thermally induced birefringence phenomenon, have influence on fundamental frequency polarisation of light state in the resonant cavity.The walk-off effect that the non-homogeneous temperature rise of nonlinear crystal causes makes that the laser harmonic output power reduces, the output beam quality descends.Therefore, the static radiating mode of nonlinear crystal can not satisfy the actual needs of present high power tuned laser.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of non linear crystal dynamic heat dispersion device, the influence of effects such as the walk-off effect that non-homogeneous temperature rise caused on the optical direction when this device can weaken the polarization of nonlinear crystal in tuned laser frequency conversion effectively, thermally induced birefringence, improve the power output and the output beam quality of tuned laser, and make that tuned laser has that volume is little, efficient is high, characteristics such as compact conformation, work safety, adaptability are strong.
For solving the problems of the technologies described above, the present invention is achieved in that it comprises nonlinear crystal (1), heat sink (2), described nonlinear crystal (1) is placed heat sink (2), described nonlinear crystal (1) and heat sink (2) are installed on the two-dimensional motion mechanism (3), and described two-dimensional motion mechanism (3) can make heat sink (2) and nonlinear crystal (1) be kept in motion.
Described two-dimensional motion mechanism (3) moves by servo system (4) control.
Take exercises in the plane perpendicular to logical light optical axis in described two-dimensional motion mechanism (3) control nonlinear crystal (1) and heat sink (2) thereof.
Described servo system (4) can link to each other with computer (5), by the motion mode of computer (5) programming Control two-dimensional motion mechanism (3).
The available indium film parcel of described nonlinear crystal (1) is placed in heat sink (2).
The shape of described nonlinear crystal (1) has rectangle nonlinear crystal or round bar shape nonlinear crystal.
The invention has the beneficial effects as follows:
Because nonlinear crystal moves in the plane perpendicular to logical light optical axis, outside the heat of nonlinear crystal absorption laser energy generation is scattered and disappeared by periphery and logical light end face in the mode of heat conduction and thermal convection like this, because the continuous motion of nonlinear crystal makes crystals absorb the thermal source that laser energy produced and constantly is moved, also just reduced the maximum temperature rise on the nonlinear crystal optical direction, made that the thermal effect problem of nonlinear crystal on logical optical axis weakened.
Description of drawings
Fig. 1 is a rectangle nonlinear crystal construction for heat radiating device schematic diagram;
Fig. 2 is a round bar shape nonlinear crystal construction for heat radiating device schematic diagram;
Fig. 3 is a non linear crystal dynamic heat dispersion device structural representation of the present invention;
Fig. 4 is the dynamical fashion schematic diagram of nonlinear crystal of the present invention;
Fig. 5 is the dynamical fashion schematic diagram of nonlinear crystal of the present invention;
Fig. 6 is used for the logical light optical axis schematic diagram of intracavity frequency doubling for non linear crystal dynamic heat dispersion device of the present invention;
Fig. 7 is used for the logical light optical axis schematic diagram of cavity external frequency multiplication for non linear crystal dynamic heat dispersion device of the present invention.
Embodiment
At first, heat sink according to the nonlinear crystal size design; Secondly, nonlinear crystal is placed in after with indium film parcel (also can wrap up with other soft metal films) heat sink in.By the method for cooling heat sink, keep the nonlinear crystal peripheral temperature constant relatively; At last, be installed on the two-dimensional motion mechanism that designs in advance heat sink.By the heat sink motion state of two-dimensional motion mechanism control.Servo-control system in the two-dimensional motion mechanism links to each other with computer, also can control the motion mode of two-dimensional motion mechanism by computer programming.Two-dimensional motion mechanism has been controlled nonlinear crystal and has been taken exercises in the plane perpendicular to logical light optical axis, as: the translation of circular translation, horizontal translation, vertical translation or other arbitrary forms.
The invention will be further described below in conjunction with accompanying drawing:
Fig. 1, Fig. 2 are prior art nonlinear crystal heat abstractor, comprise nonlinear crystal (1), heat sink (2).Wherein nonlinear crystal (1) has multiple shape, as: rectangle nonlinear crystal or round bar shape nonlinear crystal.The size of heat sink (2) need be according to the shape and size design processing of nonlinear crystal (1), and nonlinear crystal (1) just can be installed among heat sink (2) like this.The process of installing is: earlier nonlinear crystal (1) is wrapped up with the indium film, be placed in heat sink (2) again, can keep both to have good thermo-contact like this.The temperature of heat sink (2) can use modes such as recirculated water cooling mode or semiconductor module refrigeration to control.
Fig. 3 is a non linear crystal dynamic heat dispersion device of the present invention, the assembling schematic diagram of nonlinear crystal (1), heat sink (2), two-dimensional motion mechanism (3), servo-control system (4), computer (5).Wherein nonlinear crystal (1) and heat sink (2) are installed on the two-dimensional motion mechanism (3), and servo-control system (4) is assembled together with two-dimensional motion mechanism (3).Also servo-control system (4) can be linked to each other with computer (5), can pass through the motion mode of computer (5) programming Control two-dimensional motion mechanism (3).Two-dimensional motion mechanism (3) is carrying nonlinear crystal (1) and heat sink (2) do various motions in the plane perpendicular to logical light optical axis (6), as: the motion of circular translation, horizontal translation, vertical translation or other arbitrary forms.
As Fig. 4, shown in Figure 5, for the dynamical fashion of nonlinear crystal (1) and heat sink (2) thereof is described, we are consolidated in kinetic coordinate system with nonlinear crystal (1) and heat sink (2), i.e. the Oxy coordinate system.And will lead to light optical axis (6) and be positioned rest frame, i.e. O ' x ' y ' coordinate system, two are co-located in the plane.Wherein lead to light optical axis (6) perpendicular to O ' x ' y ' coordinate plane, and be positioned at the origin of coordinates O ' of O ' x ' y ' coordinate system.Two-dimensional motion mechanism (3) is being carried the forms of motion of nonlinear crystal (1) and heat sink (2) thereof, can be expressed as: the relative rest frame O ' x ' of kinetic coordinate system Oxy y ' moves.Can do the motion of circular translation, horizontal translation, vertical translation or other arbitrary forms.Its motion path, speed are all controlled by two-dimensional motion mechanism.
Referring to Fig. 6, shown in Figure 7, for logical light optical axis (6) is described, the frequency multiplication green glow all solid state laser (7) with laser diode end-face pump is that example describes here.The all solid state laser of laser diode end-face pump uses nonlinear crystal to produce green laser dual mode: intracavity frequency doubling (as shown in Figure 6) and cavity external frequency multiplication (as shown in Figure 7), so there is the inside and outside of cavity dual mode position of nonlinear crystal (1) and heat sink (2) thereof.
The green glow all solid state laser (7) of the laser diode end-face pump that exemplifies comprises laser diode pumping source (8), optical coupling system (9), planar cavity mirror (10), plano-concave outgoing mirror (11), laser crystal (12) and heat sink (13), nonlinear crystal (1) and heat sink (2), dichronic mirror (14).Wherein logical light optical axis (6) is the residing optical axis of laser emission direction.For the laser of nonlinear crystal resonance cavity external frequency multiplication, be the radiation direction of laser output laser.For the laser of nonlinear crystal resonance intracavity frequency doubling, be the residing axis of fundamental frequency light of vibration in the resonant cavity.Dichronic mirror (14) uses in the laser of nonlinear crystal resonance intracavity frequency doubling, its role is to eliminate the influence of reflect green light for laser, and can increase the green glow power output.
Non linear crystal dynamic heat dispersion device of the present invention can be applied in the laser of various tuning laser frequencies, as: the tuned laser (OPO) of cavity external frequency multiplication and laser frequently, intracavity frequency doubling and laser frequently and the conversion of various parameter.
Claims (5)
1, a kind of non linear crystal dynamic heat dispersion device, it comprises nonlinear crystal (1), heat sink (2), described nonlinear crystal (1) is placed heat sink (2), it is characterized in that: described nonlinear crystal (1) and heat sink (2) are installed on the two-dimensional motion mechanism (3), and described two-dimensional motion mechanism (3) can make heat sink (2) and nonlinear crystal (1) be kept in motion.
2, non linear crystal dynamic heat dispersion device according to claim 1 is characterized in that: described two-dimensional motion mechanism (3) moves by servo system (4) control.
3, non linear crystal dynamic heat dispersion device according to claim 1 is characterized in that: take exercises in the plane perpendicular to logical light optical axis (6) in described two-dimensional motion mechanism (3) control nonlinear crystal (1) and heat sink (2) thereof.
4, non linear crystal dynamic heat dispersion device according to claim 3 is characterized in that: described servo system (4) links to each other with computer (5), by the mode of computer (5) programming Control two-dimensional motion mechanism (3).
5, non linear crystal dynamic heat dispersion device according to claim 1 is characterized in that: described nonlinear crystal (1) is placed in heat sink (2) with indium film parcel.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610105170 CN101055969A (en) | 2006-12-15 | 2006-12-15 | Non linear crystal dynamic heat dispersion device |
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| CN 200610105170 CN101055969A (en) | 2006-12-15 | 2006-12-15 | Non linear crystal dynamic heat dispersion device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108199253A (en) * | 2018-01-12 | 2018-06-22 | 北京工业大学 | The device and method of efficient frequency multiplication |
| CN110445006A (en) * | 2019-07-31 | 2019-11-12 | 苏州创鑫激光科技有限公司 | The control method of frequency-changer crystal point a kind of and frequency-changer crystal change point methods |
-
2006
- 2006-12-15 CN CN 200610105170 patent/CN101055969A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108199253A (en) * | 2018-01-12 | 2018-06-22 | 北京工业大学 | The device and method of efficient frequency multiplication |
| CN110445006A (en) * | 2019-07-31 | 2019-11-12 | 苏州创鑫激光科技有限公司 | The control method of frequency-changer crystal point a kind of and frequency-changer crystal change point methods |
| CN110445006B (en) * | 2019-07-31 | 2021-05-14 | 苏州创鑫激光科技有限公司 | Control method of frequency conversion crystal point position and point changing method of frequency conversion crystal |
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