CN108760253A - A kind of laser crystal thermal focal method for fast measuring - Google Patents
A kind of laser crystal thermal focal method for fast measuring Download PDFInfo
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- CN108760253A CN108760253A CN201810941447.7A CN201810941447A CN108760253A CN 108760253 A CN108760253 A CN 108760253A CN 201810941447 A CN201810941447 A CN 201810941447A CN 108760253 A CN108760253 A CN 108760253A
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- laser
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- thermal focal
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/02—Testing optical properties
- G01M11/0207—Details of measuring devices
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- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
Abstract
The invention discloses a kind of laser crystal thermal focal method for fast measuring, pumping source first sends out pump light, makes to generate thermal lensing effect inside laser crystal, and adjust the size of current of pumping source, make under current regulation to the electric current of required pump power；False impulse laser is sent out into pulse laser and vertically injects laser crystal, and forms a focus point, i.e. thermal focal outside laser crystal, the point of the focus point minimum of auxiliary laser is found by the position of mobile receiver board；The distance between receiver board and laser crystal is subsequently measured with meter scale, above-mentioned distance is actual thermal focal length.Equipment is few used in laser crystal thermal focal method for fast measuring of the present invention, simple in structure, easy to operate, can quickly realize the thermal lens focal length of laser crystal under different pump powers.
Description
Technical field
The present invention relates to optical testing technology, laser technology fields, mainly for profile pump structure or end pumping knot
Thermal focal of the laser crystal under arbitrary pump power measures under structure, to obtain thermal focal data, Computer Aided Design resonance
Chamber and operating current.
Background technology
For laser crystal while absorbing pump energy, part pump energy can be changed into the thermal energy of crystal, cause
Laser crystal temperature increase, and with cooling system collective effect, temperature gradient is formed in crystal, so as to cause the refraction of crystal
The variation of rate and thermal stress leads to crystal thermal deformation, i.e. thermal lensing effect.
The thermal focal of laser crystal has very important influence in the design of laser cavity, directly determines Resonator design
Stability and power output.The detection of the thermal focal of laser crystal at present is frequently with profile pump structure thermal lens focal length side
Method, there are problems that it is of high cost, can not realize thermal lens focal length under arbitrary pump power well.
Invention content
It is low the purpose of the present invention is to provide a kind of laser crystal thermal focal method for fast measuring to overcome disadvantages mentioned above
The thermal lens focal length problem of laser crystal under the arbitrary pump power of realization of cost.
In order to reach object above, the technical solution adopted by the present invention is：A kind of quick side of measurement of laser crystal thermal focal
Method includes the following steps：
Step 1 starts pumping source, and pumping source sends out pump light, and laser crystal is after absorbing pump light in laser crystal
Portion generates thermal lensing effect, forms thermal lens；The size of current for adjusting pumping source, makes current regulation to the electricity of required pump power
It flows down；
Step 2 starts false impulse laser, and false impulse laser sends out pulse laser and vertically injects laser crystal,
And laser crystal has formed thermal lens, which can form a focus point, i.e. thermal focal after passing through the thermal lens, mobile
The point of focus point minimum is found in the position of receiver board；
The distance between receiver board and laser crystal is measured with meter scale in step 3, and above-mentioned distance is that actual thermal lens is burnt
Away from.
Pumping source is semiconductor laser under normal circumstances, and quantity is three, and laser is evenly distributed in 120 ° of intervals
Around crystal.When needing to obtain the thermal focal under certain pump power, by under the electric current of current regulation to required power, laser is brilliant
Body forms thermal lens after absorbing the pump light that pumping source is sent out, and false impulse laser reflects pulse laser (10kHz amounts
Grade, 5W magnitudes), it is vertical to inject and pass through laser crystal, focus point is formed outside laser crystal, directly uses receiver board (metal
Plate or CCD) focusing smallest point is found, it is actual thermal focal length at a distance from laser crystal that receiver board, which is measured with meter scale, on
It states and measures the position observation acquisition that need to only adjust receiver board, it is simple in structure, after pump power changes, it is only necessary to adjust receiver board
Positional distance is obtained with thermal focal length, easy to operate, easily realizes.
When the coupled modes of pumping source are profile pump, the pulse laser that false impulse laser is sent out can be direct
It is incident upon in laser crystal, can also be to be reflected into laser crystal, wherein the mode reflected is as follows：False impulse laser
It sends out pulse laser vertically to inject in laser crystal after speculum reflects, the angle between above-mentioned pulse laser and speculum is
45 degree, shape replicated structures at 45 °.
When the coupled modes of pumping source are end pumping, the pulse laser that false impulse laser is sent out can pass through
45 ° of speculums are that the false impulse laser of end pumping measures thermal focal.
Compared with prior art, equipment used in laser crystal thermal focal method for fast measuring of the present invention is few,
It is simple in structure, it is easy to operate, it can quickly realize the thermal lens focal length of laser crystal under different pump powers.
Description of the drawings
Fig. 1 is the structural schematic diagram of middle arteries impulse light direct beam of the embodiment of the present invention；
Fig. 2 is the structural schematic diagram of middle arteries impulse light reflection of the embodiment of the present invention；
Fig. 3 is the pulse laser structural schematic diagram of end pumping in the embodiment of the present invention.
In figure：
1- false impulse lasers；2- laser crystals；3- receiver boards；4- speculums.
Specific implementation mode
The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, so that advantages and features of the invention energy
It is easier to be readily appreciated by one skilled in the art, so as to make a clearer definition of the protection scope of the present invention.
Embodiment
Shown in attached drawing 1, Fig. 2, Fig. 3, a kind of laser crystal thermal focal method for fast measuring in the present embodiment, including
The following steps：
Step 1 starts pumping source, and pumping source sends out pump light, and laser crystal 2 is after absorbing pump light in laser crystal 2
Inside generates thermal lensing effect, forms thermal lens；The size of current for adjusting pumping source, makes current regulation to required pump power
Under electric current；
Step 2 starts false impulse laser 1, and false impulse laser 1 sends out pulse laser and vertically injects laser crystal
2, and laser crystal has formed thermal lens, which can form a focus point, i.e. thermal focal after passing through the thermal lens, move
The position of receiver board 3 is moved to find the point of focus point minimum；
The distance between receiver board 3 and laser crystal 2 is measured with meter scale in step 3, and above-mentioned distance is that actual thermal lens is burnt
Away from.
Pumping source is semiconductor laser under normal circumstances, and quantity is three, and laser is evenly distributed in 120 ° of intervals
Around crystal 2.When needing to obtain the thermal focal under certain pump power, by under the electric current of current regulation to required power, laser
Crystal 2 forms thermal lens after absorbing the pump light that pumping source is sent out, and false impulse laser 1 reflects pulse laser (10kHz
Magnitude, 5W magnitudes), general pulse laser can be more than 5W magnitudes, vertical to inject in laser crystal 2, and laser crystal 2 is absorbing pulse
Thermal focal is formed after laser outside laser crystal 2, directly uses receiver board 3 (metallic plate or CCD) to find and focuses smallest point, with rice
It is actual thermal focal length at a distance from laser crystal that ruler, which measures receiver board, and the position that above-mentioned measurement need to only adjust receiver board is seen
Acquisition is examined, it is simple in structure, after pump power changes, it is only necessary to which the positional distance for adjusting receiver board is obtained with thermal lens coke
Away from, it is easy to operate, easily realize.
Fig. 1 is that the coupled modes of pumping source are profile pump, and the pulse laser that false impulse laser 1 is sent out is emitted directly toward
To laser crystal 2；Fig. 2 is that the coupled modes of pumping source are profile pump, the pulse laser warp that false impulse laser 1 is sent out
Speculum 4 is vertically injected after reflecting in laser crystal 2.Fig. 3 is that the coupled modes of pumping source are end pumping, false impulse laser
The pulse laser that device 1 is sent out vertically is injected after the reflection of speculum 4 in laser crystal 2, between above-mentioned pulse laser and speculum 4
Angle be 45 degree, the end-pumped laser of shape replicated structures at 45 °.
Equipment is few used in laser crystal thermal focal method for fast measuring of the present invention, simple in structure, easy to operate,
It can quickly realize the thermal lens focal length of laser crystal under different pump powers.
The technical concepts and features of embodiment of above only to illustrate the invention, its object is to allow be familiar with technique
People understands the content of invention and is implemented, and it is not intended to limit the scope of the present invention, all according to spirit of that invention reality
The equivalent change or modification that matter is done should all cover within the scope of the present invention.
Claims (6)
1. a kind of laser crystal thermal focal method for fast measuring, feature include the following steps：
Step 1 starts pumping source, and pumping source sends out pump light, and laser crystal produces after absorbing pump light inside laser crystal
Heat lens effect forms thermal lens；The size of current for adjusting pumping source, makes current regulation to the electric current of required pump power
Under；
Step 2 starts false impulse laser, and false impulse laser sends out pulse laser and vertically injects laser crystal, and swashs
Luminescent crystal has formed thermal lens, which can form a focus point, i.e. thermal focal after passing through the thermal lens, mobile to receive
The point of focus point minimum is found in the position of plate；
The distance between receiver board and laser crystal is measured with meter scale in step 3, and above-mentioned distance is actual thermal focal length.
2. laser crystal thermal focal method for fast measuring according to claim 1, it is characterised in that：The pumping source is half
Conductor laser, quantity are three, are evenly distributed on around laser crystal in 120 ° of intervals.
3. laser crystal thermal focal method for fast measuring according to claim 1, it is characterised in that：The false impulse swashs
Light device sends out pulse laser and is vertically injected in laser crystal after speculum reflects.
4. laser crystal thermal focal method for fast measuring according to claim 3, it is characterised in that：The pulse laser with
Angle between speculum is 45 degree, shape replicated structures at 45 °.
5. laser crystal thermal focal method for fast measuring according to claim 1, it is characterised in that：The coupling of the pumping source
Conjunction mode is profile pump or end pumping.
6. laser crystal thermal focal method for fast measuring according to claim 1, it is characterised in that：The receiver board uses
Metallic plate or CCD.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810941447.7A CN108760253A (en) | 2018-08-17 | 2018-08-17 | A kind of laser crystal thermal focal method for fast measuring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810941447.7A CN108760253A (en) | 2018-08-17 | 2018-08-17 | A kind of laser crystal thermal focal method for fast measuring |
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| CN108760253A true CN108760253A (en) | 2018-11-06 |
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| CN201810941447.7A Pending CN108760253A (en) | 2018-08-17 | 2018-08-17 | A kind of laser crystal thermal focal method for fast measuring |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109540475A (en) * | 2018-11-16 | 2019-03-29 | 中国科学院光电研究院 | A kind of side pump amplifier thermal lens spherical aberration measurement device and method |
| CN110987379A (en) * | 2019-12-24 | 2020-04-10 | 哈尔滨工业大学 | Method and device for measuring focal length of laser crystal thermal lens by using knife edge method |
| CN111175023A (en) * | 2019-12-24 | 2020-05-19 | 哈尔滨工业大学 | Laser crystal thermal lens focal length online real-time measurement device and method |
| CN112345209A (en) * | 2020-09-07 | 2021-02-09 | 武汉光谷航天三江激光产业技术研究院有限公司 | End-pumped laser crystal thermal focus measuring device and method |
| CN112504632A (en) * | 2020-11-08 | 2021-03-16 | 中国航空工业集团公司洛阳电光设备研究所 | Thermal focus measuring device based on internal focusing collimator |
| CN114235348A (en) * | 2021-11-25 | 2022-03-25 | 大连透平机械技术发展有限公司 | Focal length determining method and device of pulse laser and storage medium |
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| US5657119A (en) * | 1995-02-01 | 1997-08-12 | Cornell Research Foundation, Inc. | Spectrometry using an optical parametric oscillator |
| CN2745056Y (en) * | 2004-07-13 | 2005-12-07 | 宁波大学 | Laser bar device for measuring focal length of thermal lens |
| CN105547656A (en) * | 2016-02-02 | 2016-05-04 | 潍坊学院 | Method and device for online measurement of laser crystal thermal lens focal length in real time |
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2018
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| US5657119A (en) * | 1995-02-01 | 1997-08-12 | Cornell Research Foundation, Inc. | Spectrometry using an optical parametric oscillator |
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| CN105547656A (en) * | 2016-02-02 | 2016-05-04 | 潍坊学院 | Method and device for online measurement of laser crystal thermal lens focal length in real time |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109540475A (en) * | 2018-11-16 | 2019-03-29 | 中国科学院光电研究院 | A kind of side pump amplifier thermal lens spherical aberration measurement device and method |
| CN110987379A (en) * | 2019-12-24 | 2020-04-10 | 哈尔滨工业大学 | Method and device for measuring focal length of laser crystal thermal lens by using knife edge method |
| CN111175023A (en) * | 2019-12-24 | 2020-05-19 | 哈尔滨工业大学 | Laser crystal thermal lens focal length online real-time measurement device and method |
| CN110987379B (en) * | 2019-12-24 | 2021-10-15 | 哈尔滨工业大学 | Method and device for measuring focal length of laser crystal thermal lens by using knife edge method |
| CN112345209A (en) * | 2020-09-07 | 2021-02-09 | 武汉光谷航天三江激光产业技术研究院有限公司 | End-pumped laser crystal thermal focus measuring device and method |
| CN112504632A (en) * | 2020-11-08 | 2021-03-16 | 中国航空工业集团公司洛阳电光设备研究所 | Thermal focus measuring device based on internal focusing collimator |
| CN112504632B (en) * | 2020-11-08 | 2023-09-19 | 中国航空工业集团公司洛阳电光设备研究所 | Hot focal length measuring device based on interior focusing collimator |
| CN114235348A (en) * | 2021-11-25 | 2022-03-25 | 大连透平机械技术发展有限公司 | Focal length determining method and device of pulse laser and storage medium |
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