CN104090446A - Method for influencing crystal light refraction index through stress compensation temperature - Google Patents
Method for influencing crystal light refraction index through stress compensation temperature Download PDFInfo
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- CN104090446A CN104090446A CN201410301617.7A CN201410301617A CN104090446A CN 104090446 A CN104090446 A CN 104090446A CN 201410301617 A CN201410301617 A CN 201410301617A CN 104090446 A CN104090446 A CN 104090446A
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Abstract
本发明提供了一种应力补偿温度对晶体光折射率影响的方法，在光学器件上加入温度监测系统，温度监测系统实时的监控光学器件的工作温度；然后将温度监测系统实时的监控光学器件的工作温度传回到晶体的控制系统；控制系统通过读出的工作温度值，根据温度对光折变指数的影响的图形中温度T与光折变指数Δn对应的关系，求出器件在该工作温度条件下的光折变系数的值；然后对应于正常情况下晶体的应力σ与光折变指数Δn的对应图像中的光折变指数Δn，求出该光折变指数Δn对应的应力σ值，通过控制系统，在器件上加上相应的应力σ值。通过本发明，能够设计出更精确，更为实用的应力光学器件，使得器件的使用范围更广，其性能更为可靠。
The invention provides a method for stress compensating the influence of temperature on the optical refractive index of crystals. A temperature monitoring system is added to the optical device, and the temperature monitoring system monitors the working temperature of the optical device in real time; and then the temperature monitoring system monitors the temperature of the optical device in real time. The working temperature is transmitted back to the control system of the crystal; the control system obtains the corresponding relationship between the temperature T and the photorefractive index Δn in the graph of the influence of temperature on the photorefractive index through the read-out working temperature value, and obtains the working temperature of the device. The value of the photorefractive coefficient under temperature conditions; then corresponding to the photorefractive index Δn in the image corresponding to the stress σ of the crystal and the photorefractive index Δn under normal conditions, the stress σ corresponding to the photorefractive index Δn is obtained Value, through the control system, add the corresponding stress σ value on the device. Through the present invention, more accurate and practical stress optical devices can be designed, so that the device can be used in a wider range and its performance is more reliable.
Description
Technical field
The present invention relates to crystal light and sell off, relate in particular to stress compensation adjustment temperature and crystal light is sold off to the method for impact.
Background technology
Photorefractive effect refers to the effect that photic crystal refractive index changes, and it is that photoinduction space charge field makes by electrooptical effect the phenomenon that in Light in Medium irradiation zone, refractive index changes.Due to photorefractive material, have the features such as significant electro-optical characteristic, nonlocal response and high-gain, therefore, it has been widely used in the aspects such as optical information processing, storage.Utilize photorefractive effect to make multi-purpose light and sell off nonlinear device, light is sold off nonlinear optics and has been developed into an important branch in current nonlinear optics.It should be noted that temperature and photorefractive effect are closely related, the input of information, read etc. is all subject to the impact of temperature.Conventional piezoelectric crystal, under effect of stress, crystal can produce photorefractive effect, and stress and light are sold off the specific relation that presents, for different crystal under certain effect of stress, its corresponding light is sold off all and can be presented certain value.The optical dioptric device of design is all that the relation between selling off according to crystal temperature effect under normal temperature and light designs, but, device can often not worked or work in a stationary temperature under normal temperature, variation counter stress and the light relation of selling off of temperature have a serious impact, between them, no longer present original relation, this optical dioptric device that just the current design of explanation is used also has certain deficiency in precision.
Conventional piezoelectric crystal, for different crystal, under certain temperature conditions, its corresponding light is sold off all and can be presented certain value.But device can often not worked or work in a stationary temperature under normal temperature, variation counter stress and the light relation of selling off of temperature have a serious impact, and no longer present original relation between them.The impact on the performance of device in the temperature of its specific working environment when the crystal optics of using at present does not also consider that device is used, just there is variation in the relation that the crystal stress of therefore considering when design device and light are sold off, this has proposed acid test to device accuracy in use in actual applications.
Summary of the invention
The invention discloses a kind of method that compensation by stress regulates the impact that temperature sells off crystal light.When crystal is worked under different temperature environments, it is different that its light is sold off, and this has very large inhibition for design optical dioptric device, therefore needs finding method to eliminate the impact of temperature.The present invention regulates the impact of temperature by stress compensation.On crystal, add certain stress value, the light of crystal is sold off also corresponding specific value, be that the light of crystal is sold off with added stress and presented a kind of specific corresponding relation, therefore the size that adds stress on crystal by being adjusted in is eliminated the impact that temperature is sold off light, stress and the light relation of selling off of crystal are revised, thereby can make accurately device in environment for use, by the crystal light of design, sell off and temperature between relation operation so that the precision of quartz crystal device is higher.
The method of stress compensation temperature on the impact of crystal optical index, comprises the steps:
On optical device, add temperature monitoring system, the working temperature of the monitoring optical device that temperature monitoring system is real-time;
Then the working temperature of the real-time monitoring optical device of temperature monitoring system is transferred back to the control system of crystal;
Control system is by the working temperature value of reading, and according to temperature, light sold off temperature T in the figure of impact of index and sold off with light the relation that index Δ n is corresponding, obtains the value that the light of device under this operational temperature conditions is sold off coefficient; Then corresponding to the light in the stress σ of crystal under normal circumstances and correspondence image that light is sold off index Δ n, sell off index Δ n, obtain this light and sell off the stress σ value that index Δ n is corresponding, by control system, on device, add corresponding stress σ value.
As a further improvement on the present invention, described temperature adopts thermodynamic scale.
As a further improvement on the present invention, described temperature monitoring system is one group of thermopair.
As a further improvement on the present invention, the control system of crystal is Stress Control system.
The invention has the beneficial effects as follows:
By the present invention, can design more accurate, more practical stress optics device, make the usable range of device wider, its performance is more reliable.
1, the impact of the environment for use temperature that the present invention has taken into full account crystal optics on device, this designs feasibility is provided more accurately device;
2, the present invention has effectively solved by the mode of stress compensation the impact that temperature is sold off crystal light, and the relation that temperature and light are sold off can be moved according to the relation of design;
3, the inventive method is simple and practical, and the operation of the design shape size of device itself and device is not all had to impact, just by program, controls, easy to operate.
Accompanying drawing explanation
Fig. 1 is the stress σ of lithium columbate crystal of the present invention and the corresponding relation that light is sold off index Δ n;
Fig. 2 is that lithium niobate crystal temperature of the present invention is sold off the impact of index on light;
Fig. 3 is the stress σ of cadmium tungstate crystal of the present invention and the corresponding relation that light is sold off index Δ n;
Fig. 4 is that cadmium tungstate crystal temperature of the present invention is sold off the impact of index on light.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described.
The present invention applies based on current optical crystal the designed a kind of compensation method of deficiency existing in the optical device of the designed manufacture of relation that its temperature and light sells off.Under normal circumstances, the corresponding relation that the stress σ of crystal and light are sold off index Δ n is (in figure, adopting lithium columbate crystal is example) as shown in Figure 1, and they exist relation one to one, but this is the impact of not considering temperature.The impact that temperature is sold off index to light as shown in Figure 2, therefore, when device is worked under the different condition of temperature, the relation that its stress and light are sold off must change, this has a significant impact for device application accuracy at work, therefore, in the use procedure of device, it is added to a stress compensation and eliminate the impact of temperature on device, device can be worked under the corresponding relation of design.
The concrete method of operating of the present invention is on optical device, to add one group of thermopair, the working temperature of monitoring device that can be real-time, then this temperature is transferred back to the control system of stress that crystal adds, by the temperature value of reading, then according to the relation of Fig. 2, the difference that the light when light of understanding device under real-time working condition is sold off coefficient with design is sold off coefficient, then corresponding to the stress value in Fig. 1, finally, by control system, on device, add corresponding stress value.
In the application, to sell off with the relation of temperature and stress be all to take lithium columbate crystal as example to illustrated crystal light, for other different crystal, as long as the relation that can measure accurately between this crystal three just can well use the described method of the application to eliminate the impact that in crystal working environment, temperature variation is sold off crystal light.
In following embodiment, when being all set as crystal and working under normal temperature condition, temperature and the light pass between selling off is standard, by compensation method, is adjusted in the relation between the two under other temperature conditions.Following examples is incorporated by reference to Fig. 1 and Fig. 2.Fig. 1 and Fig. 2 all be take lithium columbate crystal as example.
Embodiment 1
Adopt comparatively conventional lithium columbate crystal to be prepared into the optical device that uses its stress and photorefractive property, first test working condition under this device normal temperature and set the corresponding relation that this stresses of parts and light are sold off, then by the compensation relationship calculating, measure it works in 300K situation, because device is worked under design temperature condition, therefore compensating stress value is 0.
Embodiment 2
We adopt comparatively conventional lithium columbate crystal to be prepared into the optical device that uses its stress and photorefractive property, first we test working condition under this device normal temperature and set the corresponding relation that this stresses of parts and light are sold off, then the compensation relationship calculating by us, measure it works in 400K situation, from Fig. 2, we know that it is 7.8 that light is sold off index, corresponding to Fig. 1, compensation stress should be 0.43MPa, finally determine that working as us uses this compensation method, its light is sold off the value that index designs for us.
Embodiment 3
We adopt comparatively conventional lithium columbate crystal to be prepared into the optical device that uses its stress and photorefractive property, first we test working condition under this device normal temperature and set the corresponding relation that this stresses of parts and light are sold off, then the compensation relationship calculating by us, measure it works in 500K situation, from Fig. 2, we know that it is 8.3 that light is sold off index, corresponding to Fig. 1, compensation stress should be 0.49MPa.
Embodiment 4
We adopt comparatively conventional lithium columbate crystal to be prepared into the optical device that uses its stress and photorefractive property, first we test working condition under this device normal temperature and set the corresponding relation that this stresses of parts and light are sold off, then the compensation relationship calculating by us, measure it works in 600K situation, from Fig. 2, we know that it is 8.9 that light is sold off index, corresponding to Fig. 1, compensation stress should be 0.79MPa.
Embodiment 5
We adopt cadmium tungstate crystal to be prepared into the optical device that uses its stress and photorefractive property, first we test working condition under this device normal temperature and set the corresponding relation that this stresses of parts and light are sold off, then the compensation relationship calculating by us, measure it works in 500K situation, from Fig. 4, we know that it is 5.3 that light is sold off index, corresponding to Fig. 3, compensation stress should be 0.22MPa.
Embodiment 6
We adopt cadmium tungstate crystal to be prepared into the optical device that uses its stress and photorefractive property, first we test working condition under this device normal temperature and set the corresponding relation that this stresses of parts and light are sold off, then the compensation relationship calculating by us, measure it works in 600K situation, from Fig. 4, we know that it is 6.0 that light is sold off index, corresponding to Fig. 3, compensation stress should be 0.39MPa.
The present invention has effectively solved optical device environment for use temperature and optical device stress and light has been sold off to the impact of relation, can control more accurately the relation of the two, make them always according to the corresponding relation operation of our design, this use to optical device provides more wide space.
The present invention mainly realizes stress by program design and compensates comparatively accurately, and this is on not impact such as the design of the shape of device etc., and on the running environment of device also impact useless, so the method is simple, convenient, there is no what additional adverse influence.
Above content is in conjunction with concrete preferred implementation further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (4)
1. the method that stress compensation temperature affects crystal optical index, is characterized in that:
On optical device, add temperature monitoring system, the working temperature of the monitoring optical device that temperature monitoring system is real-time;
Then the working temperature of the real-time monitoring optical device of temperature monitoring system is transferred back to the control system of crystal;
Control system is by the working temperature value of reading, and according to temperature, light sold off temperature T in the figure of impact of index and sold off with light the relation that index Δ n is corresponding, obtains the value that the light of device under this operational temperature conditions is sold off coefficient; Then corresponding to the light in the stress σ of crystal under normal circumstances and correspondence image that light is sold off index Δ n, sell off index Δ n, obtain this light and sell off the stress σ value that index Δ n is corresponding, by control system, on device, add corresponding stress σ value.
2. the method for a kind of stress compensation temperature according to claim 1 on the impact of crystal optical index, is characterized in that: described temperature adopts thermodynamic scale.
3. the method for a kind of stress compensation temperature according to claim 1 on the impact of crystal optical index, is characterized in that: described temperature monitoring system is one group of thermopair.
4. the method for a kind of stress compensation temperature according to claim 1 on the impact of crystal optical index, is characterized in that: the control system of crystal is Stress Control system.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1045200A (en) * | 1989-02-09 | 1990-09-05 | 麻省理工学院 | Microchip laser |
| WO1996029585A1 (en) * | 1995-03-17 | 1996-09-26 | Alliedsignal Inc. | Photoelastic pressure sensor with plate wave guide and in particular birefringent modified spectrum |
| CN1369720A (en) * | 2000-10-10 | 2002-09-18 | Jds尤尼费斯公司 | Strain stabilizing double-refracting crystal |
| CN1671047A (en) * | 2005-04-11 | 2005-09-21 | 西安电子科技大学 | A method for compensating crystal frequency-temperature characteristics based on temperature-sensing material stress |
| CN103335757A (en) * | 2013-06-26 | 2013-10-02 | 北京航空航天大学 | Crystal type pressure, stress or acceleration sensor and optical measuring method |
-
2014
- 2014-06-27 CN CN201410301617.7A patent/CN104090446A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1045200A (en) * | 1989-02-09 | 1990-09-05 | 麻省理工学院 | Microchip laser |
| WO1996029585A1 (en) * | 1995-03-17 | 1996-09-26 | Alliedsignal Inc. | Photoelastic pressure sensor with plate wave guide and in particular birefringent modified spectrum |
| CN1369720A (en) * | 2000-10-10 | 2002-09-18 | Jds尤尼费斯公司 | Strain stabilizing double-refracting crystal |
| CN1671047A (en) * | 2005-04-11 | 2005-09-21 | 西安电子科技大学 | A method for compensating crystal frequency-temperature characteristics based on temperature-sensing material stress |
| CN103335757A (en) * | 2013-06-26 | 2013-10-02 | 北京航空航天大学 | Crystal type pressure, stress or acceleration sensor and optical measuring method |
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