CN203337544U - Measuring device for residual reflection of edge covering interface of optical gain medium - Google Patents
Measuring device for residual reflection of edge covering interface of optical gain medium Download PDFInfo
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- CN203337544U CN203337544U CN2013203403787U CN201320340378U CN203337544U CN 203337544 U CN203337544 U CN 203337544U CN 2013203403787 U CN2013203403787 U CN 2013203403787U CN 201320340378 U CN201320340378 U CN 201320340378U CN 203337544 U CN203337544 U CN 203337544U
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Abstract
The utility model discloses a measuring device for residual reflection of an edge covering interface of an optical gain medium. According to the measuring device, the influences of factors of absorption and scattering loss inside laser glass, refection of the laser glass and an air interface and the like can be directly eliminated by comparing the laser glass before and after edge covering, so that the residual reflection rate of the edge covering interface of the laser glass can be measured rapidly and conveniently; an incidence angle and an incidence point of incidence light are changed by the precise positioning of a laser glass clamping device so that the residual reflection of the edge covering interface of the laser glass under the conditions of different incidence angles and different measuring points can be measured conveniently.
Description
Technical field
The utility model relates to the gain medium fields of measurement, specifically a kind of measurement mechanism of gain of light medium bound edge interface residual reflection.
Background technology
Gain of light medium is widely used in all types of solid state lasers, and becomes the main laser material of high power and high-energy laser.Gain medium is generally a kind of solid laser material that glass is matrix of take, and host glass and active ions two parts, consists of.The various physical propertys of laser glass and chemical property are mainly by the host glass decision, and its spectral quality is mainly determined by active ions.
According to the composition of laser glass, it has following features: the first, in the lighting means of active ions, metastable state must be arranged, and form three-level or four-level mechanism; And require metastable state that longer life is arranged, make population be easy to accumulation and reach reversion.The second, laser host glass must have good transparency, especially should be low as far as possible to the absorption of optical maser wavelength.The 3rd, laser glass must have good optical homogeneity.The optical heterogeneity of laser glass makes light pass through after glass wave deformation and produce path difference, impels its oscillation threshold to rise good Efficiency Decreasing, and the angle of divergence increases.The 4th, laser glass must have good thermo-optical stability.Because the nonradiative transition loss of active ions and the ultraviolet of host glass, a part of light energy conversion of infrared absorption optical pumping are heat energy, while is due to the difference of heat absorption and cooling condition, radially just there will be thermograde, the optical homogeneity that causes laser glass reduces and affects laser activity.The 5th, laser glass must have good physical and chemical performance.Comprise that tendency towards devitrification is little, chemical stability is high, and certain physical strength and good light durability and heat conductance etc. are arranged.
In the laser amplifier process, because the gain of laser glass is very high, the spontaneous radiation in medium will be amplified and produce amplified spontaneous emission (being called for short ASE).Existence due to ASE, to before arriving, flashlight consume the reversion particle of energy level on gain media, make flashlight can not get effective amplification, this has not only seriously reduced energy storage density and the energy storage efficiency of gain medium, and can cause distributing again of the interior pumping energy of medium, the gain homogeneity is had and has a strong impact on.
At present, the main method that suppresses ASE is that the side at the sheet laser glass perpendicular to optical path direction connects the glass of absorbing laser wavelength by the mode of gummed, destroys the ASE amplification process, is called the laser glass bound edge.Between laser glass, cementing layer and bound edge glass, the index matching degree is to affect the key that the laser glass bound edge reduces ASE, is the most important parameters of weighing laser glass bound edge quality.Laser glass and cementing layer boundary reflection and bound edge glass and cementing layer boundary reflection summation are called the residual reflection of laser glass bound edge.Therefore, the residual reflection of Measurement accuracy bound edge can reflect the quality of laser glass bound edge directly, objectively.
The measuring method of current existing laser glass bound edge residual reflection is mainly by measuring bound edge glass small sample [CN 102818788 A], as right angle trigonometry piece or rectangular parallelepiped piece, the quality that reflects the laser glass bound edge, the method can't be eliminated the absorption of sample inside and the reflection of scattering loss and laser glass and Air Interface, makes measured value often be less than actual residual reflection value.There is this problem equally in the another kind of method [CN 102768202 A] of measuring the residual reflection of heavy caliber bound edge glass.
The utility model content
The technical problems to be solved in the utility model is to provide a kind of measurement mechanism of gain of light medium bound edge interface residual reflection, can't eliminate the problem of the reflection of the absorption of laser glass inside and scattering loss and laser glass and Air Interface in the residual reflection of solve measuring, and be applicable to the measurement of heavy caliber sample and small sample simultaneously.
The technical solution of the utility model is:
The measurement mechanism of gain of light medium bound edge interface residual reflection, include laser light source, spectroscope, laser intensity detector and residual reflection detector, the relatively spectroscopical reflecting surface setting of described laser light source, the laser intensity detector is arranged at the rear end of spectroscope transmission output terminal, the laser-emitting face setting of the relative laser glass sample of residual reflection detector.
Be provided with power adjustment apparatus and light-beam forming unit between described laser light source and spectroscope.
The measurement mechanism of described gain of light medium bound edge interface residual reflection also includes the locating laser light source, the relatively spectroscopical reflecting surface setting of laser light source.
The measurement mechanism of described gain of light medium bound edge interface residual reflection also includes signal processing, and described signal processing includes the Electric signal processing module be connected with the residual reflection detector with the laser intensity detector respectively and the computing machine be connected with the Electric signal processing module.
Be provided with angular adjustment apparatus between described laser light source and spectroscope.
Described angular adjustment apparatus is combined by high reflective mirror.
Laser glass sample of the present utility model mainly comprises three kinds, large-caliber laser glass sample, triangle laser glass sample and rectangle laser glass sample.See Fig. 1, four sides of large-caliber laser glass sample 1 are for bound edge glass 2, the equal polishing of front and rear surfaces; See Fig. 2, the bottom surface of triangle laser glass sample 1 is for 2, two equal polishings of central plane of bound edge glass; See Fig. 3, the rear surface of rectangle laser glass sample 1 is for bound edge glass 2, front surface polishing.
Principle of the present utility model:
See Fig. 4, triangle laser glass sample is measuring principle figure during bound edge not: at first the laser beam that light intensity is E1 incides laser glass wherein on a central plane with certain incident angle and incidence point, this central plane is R1 to the reflectivity of incident light, therefore the light intensity that incides laser glass inside is E1 * (1-R1), then laser beam enters in the laser glass sample, and in the laser glass sample interior by bound edge boundary reflection not, the laser glass sample not reflectivity at bound edge interface is R, the outgoing from another central plane of laser glass sample of laser beam after reflection, this central plane is R2 to the reflectivity of incident light, wherein, the absorption loss of laser glass is S1, scattering loss is S2, last is E2 from the light intensity of laser glass sample emitting laser light beam, E2 can obtain with formula (2):
E2 = E1×[(1-R1)×(1-R2)×(1-S1)×(1-S2)]×R （2）；
See Fig. 5, measuring principle figure after triangle laser glass sample bound edge: the laser beam that light intensity is E1 ' at first be take certain incident angle and incidence point and is incided on the central plane that the laser glass reflectivity is R1, therefore the light intensity that incides laser glass inside is E1 ' * (1-R1), then laser beam enters in the laser glass sample, and in the laser glass sample interior by the bound edge boundary reflection, the reflectivity at laser glass sample bound edge interface is R ', outgoing the central plane that laser beam after reflection is R2 from laser glass sample reflectivity, wherein, the absorption loss of laser glass is S1, scattering loss is S2, last is E2 ' from the light intensity of laser glass sample emitting laser light beam, E2 ' can obtain with formula (3):
E2’ = E1’×[(1-R1)×(1-R2)×(1-S1)×(1-S2)]×R’ (3)；
Because incident angle and the incidence point of incident light before and after bound edge are all constant, the value of [(1-R1) * (1-R2) * (1-S1) * (1-S2)] is constant, through type (3) and formula (2) are divided by and can be obtained the residual reflectance R ' at laser glass bound edge interface, and what adopt that formula (1) calculates obtains R '.
Measuring principle (seeing Fig. 6, Fig. 7) before and after rectangle laser glass sample bound edge and the measuring principle the same (seeing Fig. 8, Fig. 9) before and after large-caliber laser glass sample bound edge.Generally, in order to prevent amplified spontaneous emission ASE, produce vibration in laser glass, the inclination angle theta of bound edge face is done into about 2 ° ± 20 '.
During the utility model application, avoided the absorption of laser glass inside and the measurement of scattering loss and the factors such as laser glass and air interface reflections, directly eliminate the impact of these factors by the comparison on before and after the laser glass bound edge, thereby can measure quickly and easily the residual reflectance at laser glass bound edge interface, and change incident angle and the incidence point of incident light by the precision positioning of laser glass clamping device, thereby can measure easily the residual reflection of laser glass bound edge interface in different incidence angles and different measuring point situation.
The accompanying drawing explanation
Fig. 1 is the structural representation after large-caliber laser glass sample bound edge.
Fig. 2 is the structural representation after triangle laser glass sample bound edge.
Fig. 3 is the structural representation after rectangle laser glass sample bound edge.
Fig. 4 is not measuring principle figure during bound edge of triangle laser glass sample.
Fig. 5 is the measuring principle figure after triangle laser glass sample bound edge.
Fig. 6 is not measuring principle figure during bound edge of rectangle laser glass sample.
Fig. 7 is the measuring principle figure after rectangle laser glass sample bound edge.
Fig. 8 is not measuring principle figure during bound edge of large-caliber laser glass sample.
Fig. 9 is the measuring principle figure after large-caliber laser glass sample bound edge.
Figure 10 is the structural representation of the measurement mechanism of the utility model gain of light medium bound edge interface residual reflection.
Embodiment
In the various laser glass materials with enlarging function, neodymium glass is owing to producing laser in room temperature, and the temperature quenching effect is little, optical pumping absorb the effect string and luminous quantum efficiency high, become at present topmost laser glass material.Especially the oversize neodymium glass becomes the amplification medium of the mature and reliable of high power laser system, extensively is incorporated in various device of high power laser in the world, such as U.S.'s profit not the God Light II of the national portfire in Lovell laboratory and China and III device etc.
Therefore lower mask body by reference to the accompanying drawings 10, and are measured as example with the residual reflectance at neodymium glass bound edge interface the utility model is further elaborated, but should not limit protection domain of the present utility model with this.
See Figure 10, the measurement mechanism of gain of light medium bound edge interface residual reflection, include laser light source 1, locating laser light source 11, power adjustment apparatus 2, light-beam forming unit 3, angular adjustment apparatus, spectroscope 5, laser intensity detector 6, residual reflection detector 7, Electric signal processing module 8 and computing machine 9; Angular adjustment apparatus includes the first high reflective mirror 12 and the second high reflective mirror 10 that are arranged between locating laser light source 11 and power adjustment apparatus 2, is arranged at the anti-mirror 4 of third high and spectroscope 5 between light-beam forming unit 3 and laser glass sample 13.
The measuring method of gain of light medium bound edge interface residual reflection:
(1), at first regulate laser light source 1, power adjustment apparatus 2, light-beam forming unit 3, the anti-mirror 4 of third high and spectroscope 5, make laser beam be positioned at their center and coaxial;
(2), regulate locating laser light source 11, the first high reflective mirror 12 and the second high reflective mirror 10, make the laser beam of locating laser light source 11 outputs and the laser beams coaxial of laser light source 1 output;
(3), close laser light source 1, laser glass sample 13 during by bound edge not is placed on accurate 3 D locating device and fixes, the adjustment precision 3 D locating device, make the incoming laser beam of locating laser light source 11 incide on the needed detecting location of laser glass sample 13 with needed angle;
(4), the wavelength due to locating laser light source 11 has the weak characteristic absorbed for bound edge glass, therefore by power adjustment apparatus 2, can make the laser beam of locating laser light source 11 incide on sample with suitable power, then find the position of residual reflection hot spot, regulate the position of residual reflection detector 7 by the three-D displacement adjusting bracket, make emergent light to be received by residual reflection detector 7 fully;
(5), close locating laser light source 11, and open laser light source 1, because the wavelength of laser light source 1 has the characteristic of strong absorption for bound edge glass, therefore by power adjustment apparatus 2, make the incoming laser beam of laser light source 1 incide in sample with weak power, prevent strong absorption of bound edge glass and cause heat damage; Owing to by locating laser light source 11, having found the residual reflection hot spot and fixed the position of residual reflection detector 7 in step (4), therefore can from computing machine 9, read the light intensity value E1 of laser intensity detector 6 and the light intensity value E2 of residual reflection detector 7, and obtain and obtain formula (2):
E2 = E1×M×[(1-R1)×(1-R2)×(1-S1)×(1-S2)]×R （2）；
Wherein, R1 is the reflectivity of incident laser light beam at the neodymium glass incidence surface, and R2 is the reflectivity of laser beam at the neodymium glass exit surface; S1 and S2 are respectively absorption and the scattering loss of laser beam in neodymium glass; R is the not reflectivity at bound edge interface of neodymium glass sample, and M is spectroscopical splitting ratio;
(6), the laser glass sample 13 after bound edge is fixed by accurate 3 D locating device, because accurate 3 D locating device has the characteristics of hi-Fix, so incoming laser beam can incide the laser glass sample 13 after bound edge with same angle and same sensing point position, correspondingly, residual reflection detector 7 can arrive the residual reflection signal by direct detection;
(7), read the light intensity value E1 ' of laser intensity detector 6 and the light intensity value E2 ' of residual reflection detector 7 from computing machine 9, and obtain formula (3):
E2’ = E1’×M×[(1-R1)×(1-R2)×(1-S1)×(1-S2)]×R’ （3）；
Wherein, R1 is the reflectivity of incoming laser beam at the neodymium glass front surface, and R2 is the reflectivity of laser beam in the neodymium glass rear surface, and S1 and S2 are absorption and the scattering loss of laser beam in neodymium glass; R ' is the residual reflectance at neodymium glass sample bound edge interface, and M is spectroscopical splitting ratio;
(8), incident angle and the sensing point due to the incident laser light beam of bound edge pre-test LASER Light Source 1 all do not have to change, therefore the absorption in neodymium glass of the reflectivity R2 of the reflectivity R1 of neodymium glass incidence surface, neodymium glass exit surface, laser beam and scattering loss S1 and S2 are all unchanged, the value that is M * [(1-R1) * (1-R2) * (1-S1) * (1-S2)] is constant, by the above two formulas residual reflectance that can obtain neodymium glass sample bound edge interface of being divided by, be: R '=(E2 '/E2) * (E1/E1 ') * R, wherein R can directly try to achieve by fresnel formula.
This measuring method to step 8, can be measured the residual reflection of neodymium glass bound edge interface when different incidence angles and different detecting location by repeating step 3.
Claims (6)
1. the measurement mechanism of gain of light medium bound edge interface residual reflection, it is characterized in that: include laser light source, spectroscope, laser intensity detector and residual reflection detector, the relatively spectroscopical reflecting surface setting of described laser light source, the relatively spectroscopical transmission plane setting of laser intensity detector, the laser-emitting face setting of the relative laser glass sample of residual reflection detector.
2. the measurement mechanism of gain of light medium bound edge interface residual reflection according to claim 1, is characterized in that: be provided with power adjustment apparatus and light-beam forming unit between described laser light source and spectroscope.
3. the measurement mechanism of gain of light medium bound edge interface residual reflection according to claim 1, it is characterized in that: the measurement mechanism of described gain of light medium bound edge interface residual reflection also includes the locating laser light source, the relatively spectroscopical reflecting surface setting of locating laser light source.
4. the measurement mechanism of gain of light medium bound edge interface residual reflection according to claim 1, it is characterized in that: the measurement mechanism of described gain of light medium bound edge interface residual reflection also includes signal processing, and described signal processing includes the Electric signal processing module be connected with the residual reflection detector with the laser intensity detector respectively and the computing machine be connected with the Electric signal processing module.
5. the measurement mechanism of gain of light medium bound edge interface residual reflection according to claim 3, is characterized in that: between described laser light source and laser glass sample, be provided with angular adjustment apparatus.
6. the measurement mechanism of gain of light medium bound edge interface residual reflection according to claim 5, it is characterized in that: described angular adjustment apparatus is combined by high reflective mirror and spectroscope.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013203403787U CN203337544U (en) | 2013-06-14 | 2013-06-14 | Measuring device for residual reflection of edge covering interface of optical gain medium |
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| CN2013203403787U CN203337544U (en) | 2013-06-14 | 2013-06-14 | Measuring device for residual reflection of edge covering interface of optical gain medium |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103308487A (en) * | 2013-06-14 | 2013-09-18 | 合肥知常光电科技有限公司 | Method and device for measuring residual reflection of edge covering interface of optical gain medium |
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2013
- 2013-06-14 CN CN2013203403787U patent/CN203337544U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103308487A (en) * | 2013-06-14 | 2013-09-18 | 合肥知常光电科技有限公司 | Method and device for measuring residual reflection of edge covering interface of optical gain medium |
| CN103308487B (en) * | 2013-06-14 | 2015-12-02 | 合肥知常光电科技有限公司 | The measuring method of optical gain medium bound edge interface residual reflection |
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