KR101765447B1 - Method and system for controlling a temperature difference of solid laser light pumping medium - Google Patents

Method and system for controlling a temperature difference of solid laser light pumping medium Download PDF

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KR101765447B1
KR101765447B1 KR1020150099295A KR20150099295A KR101765447B1 KR 101765447 B1 KR101765447 B1 KR 101765447B1 KR 1020150099295 A KR1020150099295 A KR 1020150099295A KR 20150099295 A KR20150099295 A KR 20150099295A KR 101765447 B1 KR101765447 B1 KR 101765447B1
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solid
pumping
optical
laser
medium
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KR20170008052A (en
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권성옥
차병헌
차용호
신재성
김용희
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한국원자력연구원
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/09—Processes or apparatus for excitation, e.g. pumping
    • H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
    • H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
    • H01S3/0941—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a laser diode
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/02—Constructional details
    • H01S3/04—Arrangements for thermal management
    • H01S3/042—Arrangements for thermal management for solid state lasers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/09—Processes or apparatus for excitation, e.g. pumping
    • H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
    • H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/09—Processes or apparatus for excitation, e.g. pumping
    • H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
    • H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
    • H01S3/094049—Guiding of the pump light
    • H01S3/094053—Fibre coupled pump, e.g. delivering pump light using a fibre or a fibre bundle
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/09—Processes or apparatus for excitation, e.g. pumping
    • H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
    • H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
    • H01S3/094076—Pulsed or modulated pumping
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/40—Arrangement of two or more semiconductor lasers, not provided for in groups H01S5/02 - H01S5/30
    • H01S5/4025—Array arrangements, e.g. constituted by discrete laser diodes or laser bar

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Lasers (AREA)

Abstract

The present invention relates to a system and method for adjusting the temperature difference of a solid state laser light pump pumping medium which makes it possible to adjust the optical path difference so that the temperature distribution in the gain medium is uniform when the laser light generated in the laser diode is optically pumped through the gain medium.
A solid-state laser light pumping medium temperature difference adjustment system according to the present invention includes: a pumping beam device for generating laser light through a laser diode and outputting the laser light as a pumping beam; A solid laser oscillator that receives the laser light and light pumping the solid light through a solid optical pumping medium; And a plurality of optical fibers positioned between the pumping beam device and the solid laser oscillator and scattering the laser light through one or more optical fibers before the laser light output from the pumping beam device is incident on the solid optical pumping medium, And the temperature difference of the optical pumping device can be adjusted.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a solid-state laser light pumping medium,

The present invention relates to a system and method for improving the quality of a beam of a solid state laser, in which a laser diode optical pumping beam incident on a gain medium of a solid state laser is spatially modulated to make the temperature distribution in the gain medium uniform, To optimize optical path difference (OPD) and improve beam quality.

The solid state laser device is a device that oscillates a laser beam by optically pumping a gain medium with a laser diode. Since it is easy to develop a solid laser with high output, it is used for laser processing such as laser welding and cutting and military.

However, in a conventional solid state laser device, when the output is increased, the temperature distribution in the gain medium is not uniform, so that a light path difference occurs and the beam quality of the output beam is lowered. Such an optical path difference occurs in a complex manner when the spatial distribution of the pumping beam pumped by the laser diode is not uniform, the doping distribution of the gain medium is not constant, or the heat transfer between the gain medium and the cooling device is not uniform. It is difficult to overcome the causes of each optical path difference due to technical limitations.

The laser diodes used for optical pumping are stacked with dozens of laser diode bars as modules. Since each laser diode bar has different output and oscillation wavelengths, the temperature distribution of the gain medium is made non-uniform, have.

The YAG crystal used as a gain medium doped with impurities (Nd) is likely to have a non-uniform doping distribution during crystal growth or a defect in the crystal, which causes a light path difference.

And heat generated from the gain medium should be uniformly removed by the cooling device. If the contact surface between the gain medium and the cooling device is not uniformly locally, it is difficult to maintain a uniform temperature distribution, resulting in a light path difference.

In order to solve such a problem, conventionally, an auxiliary laser diode is arranged together with a laser diode used for optical papping to spatially modulate the auxiliary laser diode pumping beam for the purpose of compensating the spatial light path difference in the gain medium, A method of minimizing the optical path difference has been proposed. However, such a method is disadvantageous in that the apparatus becomes large due to the arrangement of the auxiliary laser diode and the focusing optical system.

In order to correct the temperature difference of the solid-state laser gain medium, a technique of keeping the temperature distribution in the gain medium uniform by attaching a heater, which is a heat generating device, is applied. However, There is a limit to eliminating it.

Accordingly, it is required to develop a simple optical papping modulation apparatus capable of minimizing the optical path difference and equalizing the temperature distribution in the solid-state laser gain medium and increasing the beam quality of the oscillated laser beam.

Korean Patent Publication No. 10-2004-0007045 (published on January 24, 2004)

SUMMARY OF THE INVENTION It is an object of the present invention to meet the above-mentioned needs and to provide a solid-state laser light pumping device capable of adjusting the optical path difference such that a temperature distribution in a gain medium is uniform when optical pumping laser light generated from a laser diode through a gain medium And a system and method for adjusting the temperature difference of the medium.

According to an aspect of the present invention, there is provided a solid-state laser light pumping medium temperature difference adjusting system comprising: a pumping beam device for generating a laser beam through a laser diode and outputting the laser beam as a pumping beam; A solid laser oscillator that receives the laser light and light pumping the solid light through a solid optical pumping medium; And a plurality of optical fibers positioned between the pumping beam device and the solid laser oscillator and scattering the laser light through one or more optical fibers before the laser light output from the pumping beam device is incident on the solid optical pumping medium, And the temperature difference of the optical pumping device can be adjusted.

In addition, the solid laser oscillator may have a cooling device adhered to upper and lower surfaces thereof to cool the heat generated in the solid optical pumping medium.

Further, the cooling device, which is attached to the upper surface and the lower surface of the solid optical pumping medium, respectively, can be adhered to the solid optical pumping medium for a shorter time than the length of the solid optical pumping medium so that the solid optical pumping medium is exposed have.

In addition, the pumping beam device may be installed at both end irradiation positions of the solid-state optical pumping medium, so that the laser light is irradiated to both ends of the solid-state optical pumping medium.

In addition, the pumping beam device may have a structure in which one or more laser diode bars are laminated in a module.

In addition, the optical pumping adjustment device may adjust the amount of laser light incident on the solid optical pumping medium by adjusting the thickness of each optical fiber with respect to the one or more optical fibers.

In addition, the optical pumping adjustment device can adjust the optical path difference by adjusting the distance from the solid optical pumping medium.

In addition, the optical pumping adjustment device may arrange the optical fibers of the one or more optical fibers to the left and right of the frame so as to continuously adjust the optical pumping.

The optical pumping adjustment device arranges the one or more optical fibers according to the interference fringe inclination and the interference fringe variation width of the pumping beam obtained by detecting the laser light optically pumped to the solid optical pumping medium through the interferometer detector The amount of laser light incident on the solid optical pumping medium can be adjusted.

The optical pumping adjustment device may be installed to adjust the position of the one or more optical fibers arranged in the frame using a mechanical device.

According to another aspect of the present invention, there is provided a method for adjusting a temperature difference of a solid optical pumping medium through an optical pumping adjustment device provided between a pumping beam device and a solid laser oscillator, (a) passing the search laser beam through a solid state light pumping medium; (b) measuring the interference fringe pattern by combining the passed search beam and the basic beam; And (c) adjusting the arrangement of the optical fibers based on the measured interference fringe pattern.

In addition, the step (c) may include scattering the laser light through an array of one or more optical fibers provided in the optical pumping adjustment device before laser light output from the pumping beam device is incident on the solid optical pumping medium So that the temperature difference of the solid optical pumping medium can be adjusted.

In the step (c), the optical pumping adjusting device adjusts the thickness of each optical fiber for one or more optical fibers to adjust the amount of laser light incident on the solid optical pumping medium.

In addition, the step (c) may include adjusting the distance between the optical pumping adjustment device and the solid optical pumping medium to adjust the optical path difference, or adjusting a position Can be adjusted.

In the step (b), the laser light optically pumped to the solid optical pumping medium is measured through the interferometer detector to measure the interference fringe pattern including the interference fringe inclination and the interference fringe variation width with respect to the pumping beam, , The optical pumping adjustment device arranges one or more optical fibers according to the interference fringe gradient and the variation of the fringe pattern to adjust the amount of laser light incident on the solid optical pumping medium.

According to the present invention, the laser diode optical pumping beam incident on the solid-state laser gain medium is spatially modulated to uniform the temperature distribution in the gain medium, thereby minimizing the optical path difference (OPD) and improving the beam quality can do.

In addition, since the optical path difference in the gain medium is minimized, it improves the beam quality of the solid laser, and is advantageous not only for the laser processing such as laser welding and cutting, but also for transferring the high output laser beam to the atmosphere over a long distance.

In addition, the optical path difference generated in the solid laser using the slab type gain medium is advantageous in that the optical path difference can be minimized by simply adjusting the pumping beam of the laser diode without using a complicated device.

FIG. 1 is a configuration diagram schematically showing the configuration of a solid-state laser light pumping medium temperature difference adjusting system according to an embodiment of the present invention.
2 is a view showing an arrangement structure of a laser diode bar for irradiating a laser beam onto an optical fiber in a pumping beam apparatus according to an embodiment of the present invention
3 is a view illustrating an interference fringe detection system for measuring a temperature difference of a solid optical pumping medium according to an embodiment of the present invention.
4 is a view showing an interference fringe which can confirm the temperature distribution of the solid optical pumping medium according to the embodiment of the present invention.
5 is a flowchart illustrating a method of adjusting a temperature difference of a solid-state laser light pumping medium according to an exemplary embodiment of the present invention.
6 is a view showing an example of arrangement of one or more optical fibers provided in the optical pumping adjusting device according to the embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may be embodied in many different forms and is not limited to the embodiments described herein.

In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

Throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "electrically connected" with another part in between . Also, when an element is referred to as "comprising ", it means that it can include other elements as well, without departing from the other elements unless specifically stated otherwise.

If any part is referred to as being "on" another part, it may be directly on the other part or may be accompanied by another part therebetween. In contrast, when a section is referred to as being "directly above" another section, no other section is involved.

The terms first, second and third, etc. are used to describe various portions, components, regions, layers and / or sections, but are not limited thereto. These terms are only used to distinguish any moiety, element, region, layer or section from another moiety, moiety, region, layer or section. Thus, a first portion, component, region, layer or section described below may be referred to as a second portion, component, region, layer or section without departing from the scope of the present invention.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms as used herein include plural forms as long as the phrases do not expressly express the opposite meaning thereto. Means that a particular feature, region, integer, step, operation, element and / or component is specified and that the presence or absence of other features, regions, integers, steps, operations, elements, and / It does not exclude addition.

Terms indicating relative space such as "below "," above ", and the like may be used to more easily describe the relationship to other portions of a portion shown in the figures. These terms are intended to include other meanings or acts of the apparatus in use, as well as intended meanings in the drawings. For example, when inverting a device in the figures, certain parts that are described as being "below" other parts are described as being "above " other parts. Thus, an exemplary term "below" includes both up and down directions. The device can be rotated by 90 degrees or rotated at different angles, and terms indicating relative space are interpreted accordingly.

Unless otherwise defined, all terms including technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Commonly used predefined terms are further interpreted as having a meaning consistent with the relevant technical literature and the present disclosure, and are not to be construed as ideal or very formal meanings unless defined otherwise.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

FIG. 1 is a configuration diagram schematically showing the configuration of a solid-state laser light pumping medium temperature difference adjusting system according to an embodiment of the present invention.

Referring to FIG. 1, a solid-state laser light pumping medium temperature difference adjustment system 100 according to the present invention includes a pumping beam device 110, a solid-state laser oscillator 120, and an optical pumping adjustment device 130.

The pumping beam device 110 generates a laser beam through a laser diode and outputs the laser beam as a pumping beam. At this time, the pumping beam device 110 may be installed at both end irradiation positions of the solid-state optical pumping medium 121 so that laser light is irradiated to both ends of the solid-state optical pumping medium 121.

In addition, the pumping beam device 110 may have a structure in which one or more laser diode bars are stacked in a module in each column as shown in FIG. 2 is a view showing an arrangement structure of a laser diode bar for irradiating a laser beam onto an optical fiber in a pumping beam apparatus according to an embodiment of the present invention. That is, as shown in FIG. 2, a plurality of laser diode bars are formed as one module in the longitudinal direction with respect to one optical fiber, and each module is stacked.

The solid laser oscillator 120 receives the laser light from the pumping beam device 110 and light pumping the solid light through the solid optical pumping medium. The solid laser oscillator 120 may have a cooling device 122 bonded to the upper and lower surfaces thereof to cool the heat generated in the solid optical pumping medium 121. The cooling device 122 attached to the upper surface and the lower surface of the solid optical pumping medium 121 may be a solid optical pumping medium 121 and a solid optical pumping medium 121. When the solid optical pumping medium 121 is bonded to the solid optical pumping medium 121, Can be adhered shorter than the length of the medium (121). That is, the pumping beam device 110 exposes the laser beam to the incident area for receiving the laser beam. Here, the solid optical pumping medium 121 used in the solid-state laser oscillator 120 is a slab-type gain medium using YAG (Yttrium Aluminum Garnet) crystals doped with impurities (Nd).

The optical pumping adjustment device 130 is located between the pumping beam device 110 and the solid state laser oscillator 120 and includes at least one or more of the pumping beam devices 110 before the laser light output from the pumping beam device 110 enters the solid state light pumping medium 121. [ The laser light is scattered through the plurality of optical fibers so that the temperature difference of the solid light pumping medium 121 can be adjusted.

In addition, the optical pumping adjusting device 130 may adjust the amount of laser light incident on the solid-state optical pumping medium 121 by adjusting the thickness of each optical fiber with respect to one or more optical fibers.

In addition, the optical pumping adjustment device 130 can adjust the optical path difference by adjusting the distance to the solid-state optical pumping medium 121. This is not to change the fiber array in real time, to adjust fiber optic thickness, or to change the distance between the optical fiber and the solid optical pumping medium. The optical pumping adjustment device that has been appropriately changed at the initial setting of the solid-state laser light pumping medium temperature difference adjustment system is installed and continued to be used.

Further, the optical pumping adjustment device 130 can arrange the optical fibers continuously for the one or more optical fibers by arranging the respective optical fibers on the left and right of the frame.

The optical pumping adjustment device 130 may further include one or more optical fibers (not shown) depending on the interference fringe inclination and the fringe pattern variation for the pumping beam obtained by detecting the laser light optically pumped to the solid optical pumping medium 121 through the interferometer detector So that the amount of laser light incident on the solid-state optical pumping medium 121 can be adjusted.

The optical pumping adjuster 130 may be installed to adjust the position of the optical pumping adjuster 130 in the frame by using a mechanical device for one or more optical fibers.

3 is a view illustrating an interference fringe detection system for measuring a temperature difference of a solid optical pumping medium according to an embodiment of the present invention.

3, the interference fringe detection system 300 for measuring the temperature difference of the solid state optical pumping medium 121 includes an interferometer laser device 310, a first reflector 320, a second reflector 330, A third reflector 340, a fourth reflector 350, and an interference fringe detector 360.

The interferometer laser device 310 generates and outputs a helium-neon laser beam.

The first reflector 320 reflects the helium-neon laser beam output from the interferometer laser device 310 and transmits the reflected beam to the second reflector 330.

The second reflector 330 reflects the helium-neon laser beam transmitted from the first reflector 320 and enters the solid optical pumping medium 121. At this time, the solid-state optical pumping medium 121 optically pumps the helium-neon laser beam incident from the second reflector 330 in the medium and outputs it as a search laser beam.

The third reflector 340 reflects the search laser beam output from the solid-state optical pumping medium 121 and transmits the reflected laser beam to the interference fringe detector 360.

The fourth reflector 350 receives the helium-neon laser beam output from the interferometer laser device 310 as a reference laser beam, reflects it, and transmits it to the interference fringe detector 360.

The interference fringe detector 360 combines the search laser beam transmitted from the third reflector 340 with the reference laser beam transmitted from the fourth reflector 350 to output an interference fringe as shown in FIG. 4 is a view showing an interference fringe which can confirm the temperature distribution of the solid optical pumping medium according to the embodiment of the present invention.

Therefore, the temperature distribution of the cross section of the solid-state optical pumping medium 121 can be confirmed through the interference fringe obtained from the interference fringe detector 360. [ That is, as shown in FIG. 4, as the slope of the interference fringe becomes larger, the temperature change in the gain medium is larger, and the optical path difference can be calculated through the variation of the interference fringe.

5 is a flowchart illustrating a method of adjusting a temperature difference of a solid-state laser light pumping medium according to an exemplary embodiment of the present invention.

In the embodiment of the present invention, the temperature difference of the solid optical pumping medium is adjusted through the optical pumping adjuster 130 installed between the pumping beam device 110 and the solid laser oscillator 120.

Referring to FIG. 5, since the temperature distribution of the cross-section of the medium is measured to adjust the temperature difference of the solid-state optical pumping medium 121, the interferometer laser device Neon laser beam is output as a search laser beam at step 310 (S510).

The helium-neon laser beam output from the interferometer laser apparatus 310 is incident on the solid-state optical pumping medium 121 through the first reflector 320 and the second reflector 330 as a search laser beam, And transmitted to the fourth mirror 350.

Then, the search laser beam output from the interferometer laser device 310 is incident on the solid optical pumping medium 121 through the first reflector 320 and the second reflector 330 to pass through the medium (S520).

That is, in the solid-state laser oscillator 120, the search laser beam incident on the solid-state optical pumping medium 121 proceeds in the medium (optical pumping: erased) and is output as the search laser beam at the end of the medium.

At this time, the solid laser oscillator 120 may have the cooling device 122 adhered to the upper surface and the lower surface of the solid optical pumping medium 121 so as to be shorter than the length of the solid optical pumping medium so that the solid optical pumping medium 121 is exposed. have.

The search laser beam having passed through the solid-state optical pumping medium 121 is reflected by the third reflector 340 and transmitted to the interference fringe detector 360.

Next, the interference fringe detector 360 detects the interference fringe pattern by combining the search laser beam and the basic laser beam (S530).

That is, the interference fringe detector 360 combines the search laser beam and the basic laser beam to output an interference fringe pattern as shown in Fig.

FIG. 4 (a) shows that when the gain medium is optically pumped by using a laser diode, a large optical path difference occurs at the cross section of the gain medium. When the optical pumping adjuster 130 is disposed between the pumping beam device 110 and the solid optical pumping medium (gain medium) to modulate the pumping beam with one optical fiber, the optical path of the gain medium, as shown in FIG. 4 (b) It can be seen that the car has been relaxed a lot.

Even for very sophisticated lasers, the optical path difference produced by the solid-state laser gain medium is typically about 10 micrometers. Such a light path difference is difficult to correct with a deforming mirror that corrects a few micrometers, so laser oscillation with good beam quality becomes difficult. Therefore, it is desirable to minimize this optical path difference from the low power stage solid state laser oscillator, and the optical path difference should be corrected for each stage in the high power multi stage solid state laser oscillator.

Accordingly, the optical pumping adjustment device 130 adjusts the arrangement of the optical fibers based on the detected interference fringe pattern (S540).

That is, the optical pumping adjuster 130 arranges one or more optical fibers according to the detected interference fringe pattern, that is, the interference fringe gradient and the interference fringe variation width, to adjust the amount of laser light incident on the solid state optical pumping medium 121 .

6, before the laser light output from the pumping beam device 110 is incident on the solid-state optical pumping medium 121, the optical pumping adjustment device 130 adjusts the optical power of the one or more optical fibers And adjusts the temperature difference of the solid light pumping medium 121 by scattering the laser light through the array. 6 is a view showing an example of arrangement of one or more optical fibers provided in the optical pumping adjusting device according to the embodiment of the present invention. In FIG. 6, the optical pumping adjustment device 130 may be arranged across one or more optical fibers on the frame 610 as shown in (a).

The optical pumping adjustment device 130 scatters the laser beam through the fiber array on the path through which the laser beam output from the pumping beam device 110 passes to prevent some of the laser beam from entering the solid state optical pumping medium 121 . The optical fiber is hardly absorbed by the high-power laser diode pumping beam and is not damaged because it mostly scatter. In addition, since the laser diode pumping beam lost by the optical fiber is extremely small, the output power of the solid state laser is not large.

Modulating the laser diode pumping beam using the optical fiber at the position of the gain medium in the interference fringe can reduce the local temperature change in the gain medium. By reducing the local temperature change in the gain medium, the change in the refractive index in the gain medium can be reduced and the optical path difference can be minimized.

6 (b) shows a structure in which a frame 610 is provided in the optical pumping adjustment device 130, and optical fibers are arranged on the left and right sides of the frame 610, respectively, to continuously adjust the pumping beam. Since it is difficult to continuously adjust the position of the optical fiber by a mechanical method as shown in FIG. 6 (a), the optical pumping adjusting device 130 can adjust the position of the optical fiber in accordance with the interference fringe inclination shown in FIG. the optical fiber can be continuously arranged as shown in FIG. The optical pumping adjustment device 130 according to (b) of FIG. 6 is advantageous in that it can adjust the laser diode pumping beam modulation amount while continuously oscillating the solid laser.

In addition, the optical pumping adjuster 130 can adjust the amount of laser light incident on the solid optical pumping medium 121 by adjusting the thickness of each optical fiber with respect to one or more optical fibers. That is, the optical pumping adjuster 130 adjusts the thickness of the optical fibers arranged in one or more optical fibers to adjust the pumping beam modulation amount, thereby uniformly generating heat generated by the optical pumping, thereby effectively reducing the optical path difference. have.

In addition, the optical pumping adjuster 130 may adjust the distance between the solid pumping beam media 121 to reduce the optical path difference. That is, the optical pumping adjuster 130 adjusts the optical path difference by adjusting the distance to the solid optical pumping medium 121 so as to increase or decrease the amount of the pumping beam.

As described above, according to the present invention, it is possible to adjust the optical path difference so that the temperature distribution in the gain medium is uniform when the laser light generated in the laser diode is optically pumped through the gain medium, Method can be realized.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims and their equivalents. Only. The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

100: Solid state laser light pumping medium temperature difference adjustment system
110: Pumping beam device 120: Solid state laser oscillator
121: solid state optical pumping medium 122: cooling device
130: optical pumping adjustment device 300: interference fringe detection system
310: interferometer laser device 320: first reflector
330: second reflector 340: third reflector
350: fourth mirror 360: interference fringe detector

Claims (20)

A pumping beam device for generating a laser beam through a laser diode and outputting the laser beam as a pumping beam;
A solid laser oscillator that receives the laser light and light pumping the solid light through a solid optical pumping medium;
Wherein the solid state optical pumping medium is positioned between the pumping beam device and the solid state laser oscillator and the laser light optically pumped to the solid state optical pumping medium is detected through an interferometer detector before the laser light output from the pumping beam device is incident on the solid state light pumping medium And arranging one or more optical fibers according to the interference fringe inclination and interference fringe variation width of the pumping beam obtained by the optical pumping adjustment device to adjust the temperature difference of the solid optical pumping medium through the one or more optical fibers, Wherein the optical pumping adjusting device adjusts the amount of laser light incident on the solid optical pumping medium by making the thickness of each of the one or more optical fibers different from each other.
An interferometer laser device for generating and outputting a helium-neon laser beam;
A first reflector for reflecting the helium-neon laser beam output from the interferometer laser device;
A second reflector for reflecting the helium-neon laser beam reflected from the first reflector;
A solid optical pumping medium for receiving a helium-neon laser beam reflected from the second reflector, optically pumping the light beam in the medium, and outputting the light beam as a search laser beam;
A third reflector for reflecting the search laser beam output from the solid state optical pumping medium;
A fourth reflector for receiving and reflecting the helium-neon laser beam output from the interferometer laser device and outputting the reflected helium-neon laser beam as a reference laser beam; And
An interference fringe detector for detecting an interference fringe by combining a search laser beam reflected from the third reflector and a reference laser beam reflected from the fourth reflector;
Lt; / RTI >
Wherein the optical pumping adjustment device adjusts optical pumping successively by arranging the respective optical fibers on the left and right sides of the frame for the one or more optical fibers.
The method according to claim 1,
Wherein the solid laser oscillator has a cooling device adhered to upper and lower surfaces of the solid laser pumping medium to cool the heat generated in the solid optical pumping medium.
The method of claim 2,
Wherein the cooling device attached to the upper surface and the lower surface of the solid optical pumping medium is adhered to the solid optical pumping medium so that the solid optical pumping medium is exposed when the solid optical pumping medium is adhered to the solid optical pumping medium, Solid-state laser light pumping medium temperature difference adjustment system.
The method according to claim 1,
Wherein the pumping beam device is provided with two solid-state laser pumping medium temperature difference adjusters, each of which is installed at both ends of the solid-state optical pumping medium so that the laser light is irradiated to both ends of the solid- system.
The method according to claim 1,
Wherein the pumping beam device has a structure in which one or more laser diode bars are stacked in a module in each column.
delete The method according to claim 1,
Wherein the optical pumping adjusting device adjusts a distance between the solid optical pumping medium and the optical path adjusting means to adjust the optical path difference.
delete delete The method according to claim 1,
Wherein the optical pumping adjustment device is arranged to adjust a position of the one or more optical fibers arranged in the frame by using a mechanical device.
A method of adjusting a temperature difference of a solid optical pumping medium through an optical pumping adjustment device installed between a pumping beam device and a solid state laser oscillator,
(a-1) generating and outputting a helium-neon laser beam in an interferometer laser device;
(a-2) reflecting a helium-neon laser beam output from the interferometer laser device at a first reflector;
(a-3) reflecting a helium-neon laser beam reflected from the first reflector in a second reflector;
(a-4) receiving a helium-neon laser beam reflected from the second reflector in a solid-state optical pumping medium, optically pumping the beam in the medium, and outputting the beam as a search laser beam;
(a-5) reflecting a search laser beam output from the solid state optical pumping medium in a third reflector;
(b-1) receiving and reflecting the helium-neon laser beam output from the interferometer laser device at the fourth reflector and outputting the reflected helium-neon laser beam as a reference laser beam;
(b-2) detecting an interference fringe pattern by combining a search laser beam reflected from the third reflector and a reference laser beam reflected from the fourth reflector in an interference fringe detector; And
(c) adjusting the arrangement of the optical fibers based on the detected interference fringe pattern;
Lt; / RTI >
In the step (c), for each of the one or more optical fibers, the optical fibers are arranged on the left and right sides of the frame to continuously adjust the optical pumping,
Wherein the step (c) comprises: scattering the laser light through an array of one or more optical fibers provided in the optical pumping adjustment device before the laser light output from the pumping beam device is incident on the solid optical pumping medium, Adjusting the temperature difference of the solid optical pumping medium,
In the step (c), the optical pumping adjuster adjusts the thickness of each optical fiber for one or more optical fibers to adjust the amount of laser light incident on the solid optical pumping medium,
Wherein the step (b-2) comprises the steps of: detecting the interference fringe pattern including the interference fringe inclination and the variation of the fringe pattern with respect to the interference fringe pattern;
Wherein the optical pumping adjustment device adjusts the amount of laser light incident on the solid optical pumping medium by arranging one or more optical fibers according to the interference fringe gradient and the variation of the fringe pattern,
Solid state laser light pumping medium temperature difference adjustment method.
delete The method of claim 11,
(C) is characterized in that the cooling device is bonded to the upper and lower surfaces of the solid optical pumping medium so that the solid optical pumping medium is shorter than the length of the solid optical pumping medium, Temperature difference adjustment method.
The method of claim 11,
Wherein each of the pumping beam devices is installed at both end irradiation positions of the solid light pumping medium so that the laser light is irradiated to both ends of the solid light pumping medium, Adjusting method of optical pumping medium temperature difference.
The method of claim 11,
Wherein in the step (c), the pumping beam device has a structure in which one or more dozens of laser diode bars are laminated in a modular manner for each column.
delete The method of claim 11,
Wherein the step (c) adjusts the optical path difference by adjusting a distance between the optical pumping adjustment device and the solid optical pumping medium.
delete delete The method of claim 11,
Wherein the step (c) adjusts the position of the optical pumping adjuster arranged on the frame using mechanical devices for one or more optical fibers.
KR1020150099295A 2015-07-13 2015-07-13 Method and system for controlling a temperature difference of solid laser light pumping medium KR101765447B1 (en)

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JP2004259954A (en) * 2003-02-26 2004-09-16 Orc Mfg Co Ltd Solid-state laser device
JP2008021879A (en) * 2006-07-13 2008-01-31 Japan Science & Technology Agency End surface excitation fine-rod laser gain module

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Publication number Priority date Publication date Assignee Title
JP2004259954A (en) * 2003-02-26 2004-09-16 Orc Mfg Co Ltd Solid-state laser device
JP2008021879A (en) * 2006-07-13 2008-01-31 Japan Science & Technology Agency End surface excitation fine-rod laser gain module

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