CN115173197A - Gain device and gain method - Google Patents

Gain device and gain method Download PDF

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Publication number
CN115173197A
CN115173197A CN202210909577.9A CN202210909577A CN115173197A CN 115173197 A CN115173197 A CN 115173197A CN 202210909577 A CN202210909577 A CN 202210909577A CN 115173197 A CN115173197 A CN 115173197A
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China
Prior art keywords
dichroic mirror
pump
collimator
crystal structure
laser crystal
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CN202210909577.9A
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Inventor
李成宽
李凯
朱少军
岳嵚
岳超瑜
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Shenzhen Ouling Laser Technology Co ltd
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Shenzhen Ouling Laser Technology Co ltd
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Priority to CN202210909577.9A priority Critical patent/CN115173197A/en
Publication of CN115173197A publication Critical patent/CN115173197A/en
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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
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06—Construction or shape of active medium
    • H01S3/0602—Crystal lasers or glass 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
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06—Construction or shape of active medium
    • H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
    • H01S3/067—Fibre 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

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Lasers (AREA)

Abstract

The disclosure relates to the technical field of lasers, and relates to a gain device and a gain method. The signal input collimator is used for receiving signal light and transmitting the signal light to the first dichroic mirror; the signal light is transmitted out from the first dichroic mirror and enters the laser crystal structure, the first pump light is input by the first pump collimator or the second pump light is input by the second pump collimator, positive pump gain or negative pump gain can be achieved on the signal light in the laser crystal structure, the signal light after the gain output by the laser crystal structure is coupled to the signal output collimator through the second dichroic mirror, the signal light after the gain is transmitted through the optical fiber of the signal output collimator, the residual part of the first pump light is received and led out through the second pump collimator or the residual part of the second pump light is received and led out through the first pump collimator, the input and the output of the signal light are achieved by the optical fiber in the solid laser, and the output of the light is simpler.

Description

Gain device and gain method
Technical Field
The present disclosure relates to the field of laser technology, and more particularly, to a gain device and a gain method.
Background
The traditional solid laser usually adopts a space optical path, and pumping light and signal light are incident into a laser crystal through a dichroic mirror to realize the amplification of the signal light. The signal light is transmitted into the laser crystal through a dichroic mirror, the pump light enters the laser crystal after being reflected by the dichroic mirror and combined with the signal light, the signal light is output as the signal light through the other dichroic mirror after gain is obtained, and the residual part of the pump light is output as the pump light after being reflected by the other dichroic mirror. However, the space light path of the traditional solid laser is large in volume and complex in installation, and the input light and the output light of the traditional solid laser are space light, so that the input and the output of the traditional solid laser are relatively complex in use.
It is noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present disclosure and therefore may include information that does not constitute prior art that is already known to a person of ordinary skill in the art.
Disclosure of Invention
The embodiments of the present disclosure provide a gain device and a gain method, which are intended to solve the technical problems of a conventional solid-state laser, such as a large volume of a spatial light path, a complex installation, and a complex input and output when the input light and the output light are spatial light.
In order to achieve the purpose, the technical scheme adopted by the disclosure is as follows: there is provided a gain apparatus, comprising:
a first dichroic mirror;
a signal input collimator configured to transmit signal light to the first dichroic mirror;
a laser crystal structure configured to receive the signal light transmitted out by the first dichroic mirror;
a second dichroic mirror configured to receive the signal light emitted from the laser crystal; and
a signal output collimator configured to receive the signal light transmitted out by the second dichroic mirror;
the gain device further comprises a first pump collimator configured to transmit a first pump light to the first dichroic mirror, the first dichroic mirror further configured to reflect the first pump light to the laser crystal structure, and a second pump collimator configured to receive and derive a residual portion of the first pump light exiting the laser crystal structure reflected by the second dichroic mirror;
the second pump collimator is configured to transmit second pump light to the second dichroic mirror, the second dichroic mirror is further configured to reflect the second pump light to the laser crystal structure, and the first pump collimator is configured to receive and derive a residual portion of the second pump light emitted from the laser crystal structure reflected by the first dichroic mirror.
Further, the laser crystal structure comprises a laser medium, and the laser medium is a laser crystal, a laser ceramic or a single crystal optical fiber.
Further, the light spots of the signal input collimator and the signal output collimator are matched, that is, the light spot of the signal light output by the signal input collimator is matched with the light spot of the signal light input by the signal output collimator; the spot diameter of the signal light output by the signal input collimator is smaller than the clear aperture of the laser medium.
Further, the gain device further comprises a housing, and the first dichroic mirror, the laser crystal structure and the second dichroic mirror are packaged in the housing;
the signal input collimator and the signal output collimator are fixed on the shell;
the first pump collimator and the second pump collimator are fixed on the shell.
Further, the laser medium includes a host crystal and dopant ions; said baseThe mass crystal is any one of yttrium vanadate crystal, yttrium aluminum garnet crystal, KGW crystal, KYW crystal, calcium fluoride crystal or quartz crystal; the dopant ions include Nd 3+ 、Yb 3+ 、Er 3+ 、Tm 3+ Or Ho 3+ At least one of (1).
The present disclosure also provides a gain apparatus, comprising:
a first dichroic mirror;
a signal input collimator configured to transmit signal light to the first dichroic mirror;
a laser crystal structure configured to receive the signal light transmitted out by the first dichroic mirror;
a second dichroic mirror configured to receive the signal light emitted from the laser crystal; and
a signal output collimator configured to receive the signal light transmitted out by the second dichroic mirror;
the gain device further includes a first pump collimator configured to transmit first pump light to the first dichroic mirror, the first dichroic mirror further configured to reflect the first pump light to the laser crystal structure, and the second dichroic mirror further configured to reflect a remainder of the first pump light exiting the laser crystal structure.
The present disclosure also provides a gain apparatus, which includes:
a first dichroic mirror;
a signal input collimator configured to transmit signal light to the first dichroic mirror;
a laser crystal structure configured to receive the signal light transmitted out by the first dichroic mirror;
a second dichroic mirror configured to receive the signal light emitted from the laser crystal; and
a signal output collimator configured to receive the signal light transmitted by the second dichroic mirror;
the gain device further comprises a second pump collimator configured to transmit second pump light to the second dichroic mirror, the second dichroic mirror further configured to reflect the second pump light to the laser crystal structure, and the first dichroic mirror further configured to reflect a residual portion of the second pump light exiting the laser crystal structure.
The present disclosure also provides a gain method, which includes:
transmitting the signal light to a first dichroic mirror through a signal input collimator;
the signal light transmitted by the first dichroic mirror enters a laser crystal structure;
transmitting first pump light in the same direction as the signal light transmitted through the first dichroic mirror to the laser crystal structure, or transmitting second pump light in the opposite direction to the signal light transmitted through the first dichroic mirror to the laser crystal structure;
gaining the signal light transmitted by the first dichroic mirror through the laser crystal structure;
optically coupling the gained signal output by the laser crystal structure to a signal output collimator through a second dichroic mirror;
reflecting a remaining portion of the first pump light emitted from the laser crystal structure by the second dichroic mirror or reflecting a remaining portion of the second pump light emitted from the laser crystal structure by the second dichroic mirror.
Further, the transmitting, to the laser crystal structure, the first pump light in the same direction as the signal light transmitted through the first dichroic mirror includes:
transmitting a first pump light to the first dichroic mirror through a first pump collimator,
the first pump light reflected by the first dichroic mirror and the signal light transmitted by the first dichroic mirror are transmitted in the same direction, and combined beams enter the laser crystal structure;
the transmitting, to the laser crystal structure, the second pump light in a reverse direction to the signal light transmitted out via the first dichroic mirror includes:
transmitting second pump light to the second dichroic mirror through a second pump collimator,
and the second pumping light reflected by the second dichroic mirror and the signal light transmitted by the first dichroic mirror are reversely transmitted and enter the laser crystal structure.
Further, the reflecting, by the second dichroic mirror, a remaining portion of the first pump light exiting the laser crystal structure includes:
receiving and deriving, by the second pump collimator, a residual portion of the first pump light emitted from the laser crystal structure reflected by the second dichroic mirror;
the reflecting, by the second dichroic mirror, a residual portion of the second pump light exiting the laser crystal structure, including:
receiving and deriving, by the first pump collimator, a residual portion of the second pump light emitted from the laser crystal structure reflected by the first dichroic mirror.
The gain equipment and the gain method provided by the disclosure have the following beneficial effects:
the signal input collimator is used for receiving the signal light, and the signal input collimator is used for transmitting the signal light to the first dichroic mirror, so that the signal light is favorably transmitted to the solid laser by adopting optical fibers; the signal light is transmitted out from the first dichroic mirror and enters the laser crystal structure, the first pump light is input by the first pump collimator or the second pump light is input by the second pump collimator, positive pump gain or negative pump gain can be achieved on the signal light in the laser crystal structure, the signal light after gain output by the laser crystal structure is coupled to the signal output collimator through the second dichroic mirror, the signal light after gain is transmitted through the optical fiber of the signal output collimator, and the residual part of the first pump light is received and guided out through the second pump collimator or the residual part of the second pump light is received and guided out through the first pump collimator, so that the solid laser can transmit the output signal light to the optical fiber. For signal light, the signal input collimator and the signal output collimator are designed, so that the signal input collimator and the signal output collimator have the function of a mode field adapter, simultaneously, gaussian beams transmitted between the signal input collimator and the signal output collimator have the spot size smaller than the clear aperture of a laser medium, the signal light can be transmitted with the maximum efficiency, and the input and the output of the signal light in the solid laser are simplified. The signal input collimator, the first dichroic mirror and the first pumping collimator jointly form a first micro-optical beam combiner functional area; the signal output collimator, the second dichroic mirror and the second pumping collimator jointly form a second micro-optical beam combiner functional area; by thus coupling the spatial coupling type micro-optics in the fiber laser: micro-optics beam combiner, mode field adapter, and optical element in solid laser: the laser medium, the dichroic mirror and the like are integrated, designed and coupled and packaged, so that the light path structure is simplified, the overall size of the laser is reduced, the packaging is convenient, and the laser has a higher gain effect; meanwhile, the input and the output of signal light are realized by using the optical fiber in the solid laser, so that the output of the light is simpler.
Drawings
To more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a gain device provided in one or more embodiments of the present disclosure;
fig. 2 is another schematic structural diagram of a gain device provided in one or more embodiments of the present disclosure;
fig. 3 is a schematic diagram of another structure of a gain device provided in one or more embodiments of the present disclosure.
Reference is now made to the following figures, in which:
1. a first micro-optical beam combiner functional area; 2. a second micro-optical beam combiner functional area; 10. a laser crystal structure; 101. a laser medium; 102. a heat sink; 20. inputting the signal into a collimator; 201. a signal input optical fiber; 202. a first signal lens; 30. a first pump collimator; 301. a first pump fiber; 302. a first pump lens; 40. a first dichroic mirror; 50. a second dichroic mirror; 60. a second pump collimator; 601. a second pump fiber; 602. a second pumping lens; 70. a signal output collimator; 701. a signal output optical fiber; 702. a second signal lens; 80. a housing.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present disclosure more clearly understood, the present disclosure is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the disclosure and are not intended to limit the disclosure.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, refer to an orientation or positional relationship illustrated in the drawings, which are used for convenience in describing and simplifying the disclosure, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be considered limiting of the disclosure.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present disclosure, "a plurality" means two or more unless specifically limited otherwise.
In order to explain the technical solution of the present disclosure, the following detailed description is made with reference to the specific drawings and examples.
The traditional solid laser usually adopts a space optical path, and pumping light and signal light are incident into a laser crystal through a dichroic mirror to realize the amplification of the signal light. The traditional space light path has the defects of large volume, complex installation and the like, and the output light is space light which is more complex to use than the flexible output of an optical fiber. Compared with the prior art, the components in the optical path of the optical fiber laser are connected by optical fibers, the components can be in a tapering process or packaged online miniaturized space coupling type micro-optical devices, the laser output is optical fiber flexible output, and the optical fiber laser has the advantages of simplicity in installation, small size and the like. Therefore, the present disclosure provides a gain apparatus and a gain method to solve the problems that a spatial optical path of a conventional solid-state laser has a large volume and is complex to install, and output light is spatial light and is more complex to use than flexible output of an optical fiber.
Referring to fig. 1-3, in one or more embodiments, the present disclosure provides a gain device that is a fiber coupled crystal gain, comparable to a miniaturized laser; the gain device includes: the device comprises a first dichroic mirror, a signal input collimator, a laser crystal structure, a second dichroic mirror and a signal output collimator. The signal input collimator is configured to receive signal light outside the gain device and transmit the signal light to the first dichroic mirror; the laser crystal structure is configured to receive the signal light transmitted by the first dichroic mirror; the second dichroic mirror is configured to receive the signal light emitted from the laser crystal; the signal output collimator is configured to receive the signal light transmitted out through the second dichroic mirror. The gain device further comprises a first pump collimator configured to transmit the first pump light to the first dichroic mirror, the first dichroic mirror further configured to reflect the first pump light to the laser crystal structure, and/or a second pump collimator further configured to reflect a remainder of the first pump light exiting the laser crystal structure; the second pump collimator is configured to transmit the second pump light to the second dichroic mirror, the second dichroic mirror further configured to reflect the second pump light to the laser crystal structure, the first dichroic mirror further configured to reflect a residual portion of the second pump light that emerges from the laser crystal structure.
According to the gain device provided by at least one embodiment of the present disclosure, the signal light is received by the signal input collimator, and is transmitted to the first dichroic mirror by the signal input collimator, which is beneficial to realizing the transmission of the signal light to the solid laser by using an optical fiber; the signal light is transmitted out from the first dichroic mirror and enters the laser crystal structure, the first pump light is input by combining the first pump collimator or the second pump light is input by combining the second pump collimator, positive pump gain or negative pump gain can be realized in the laser crystal structure, the signal light after the gain output by the laser crystal structure is coupled to the signal output collimator through the second dichroic mirror, finally, the signal light after the gain is transmitted through the optical fiber of the signal output collimator, and the residual part of the first pump light is received and led out through the second pump collimator or the residual part of the second pump light is received and led out through the first pump collimator, so that the solid laser can transmit the output signal light to the optical fiber. For signal light, the signal input collimator and the signal output collimator are designed, so that the signal input collimator and the signal output collimator have the function of a mode field adapter, and simultaneously, gaussian beams transmitted between the signal input collimator and the signal output collimator have the spot size smaller than the clear aperture of a laser medium, so that the signal light can be transmitted with the maximum efficiency, and the input and the output of the signal light in the solid laser are simplified. The signal input collimator, the first dichroic mirror and the first pumping collimator jointly form a first micro-optical beam combiner functional area; the signal output collimator, the second dichroic mirror and the second pump collimator jointly form a second micro-optical beam combiner functional area; by thus coupling the spatial coupling type micro-optics in the fiber laser: micro-optics beam combiner, mode field adapter, and optical element in solid state laser: the laser medium, the dichroic mirror and the like are integrated, designed and coupled and packaged, so that the light path structure is simplified, the overall size of the laser is reduced, the packaging is convenient, and the laser has a higher gain effect; meanwhile, the input and the output of signal light are realized by using the optical fiber in the solid laser, so that the output light is simpler.
Referring to fig. 1-3, in some embodiments, a gain apparatus includes: a first dichroic mirror 40, a signal input collimator 20, a laser crystal structure 10, a second dichroic mirror 50, and a signal output collimator 70; the signal input collimator 20 is located on the first input optical path of the first dichroic mirror 40; the laser crystal structure 10 is located on the output light path of the first dichroic mirror 40, and the input end of the laser crystal structure 10 receives the output light transmitted by the output light path of the first dichroic mirror 40; the laser crystal structure 10 is also located on the input optical path of the second dichroic mirror 50, and the second dichroic mirror 50 receives the output light emitted from the output end of the laser crystal; the signal output collimator 70 is located on the first output optical path of the second dichroic mirror 50. The signal input collimator 20, the first dichroic mirror 40, the laser crystal structure 10, the second dichroic mirror 50 and the signal output collimator 70 are located on the same set optical axis; the first input optical path of the first dichroic mirror 40, the output optical path of the first dichroic mirror 40, the input optical path of the second dichroic mirror 50, and the first output optical path of the second dichroic mirror 50 are all parallel to the set optical axis. The signal light of the previous stage is input from the signal input fiber 201 of the signal input collimator 20; the signal input collimator 20 is configured to transmit signal light to the first dichroic mirror 40 along a first input optical path of the first dichroic mirror 40, the first dichroic mirror 40 is configured to transmit the signal light within a set wavelength range to the laser crystal structure 10, the signal light is emitted from the laser crystal, transmitted through a first output optical path of the second dichroic mirror 50 to the signal output collimator 70, and transmitted through the signal output collimator 70, and a signal output optical fiber 701 of the signal output collimator 70 is configured to transmit the signal light coupled from the second dichroic mirror to the signal output collimator.
Referring to fig. 1, in one embodiment, the gain apparatus includes both a first pump collimator 30 and a second pump collimator 60, the first pump collimator 30 being located in the second input optical path of the first dichroic mirror 40. The first pump collimator 30 is configured to transmit the first pump light to the first dichroic mirror 40 along the second input optical path of the first dichroic mirror 40, or the first pump collimator 30 receives the pump light emitted from the second input optical path of the first dichroic mirror 40. The second pump collimator 60 is located on the second output optical path of the second dichroic mirror 50. The second pump collimator 60 is configured to transmit the second pump light to the second dichroic mirror 50 along the second output optical path of the second dichroic mirror 50, or the second pump collimator 60 receives the pump light emitted from the second input optical path of the second dichroic mirror 50. The first pump fiber 301 of the first pump collimator 30 is used to realize transmission of pump light, that is, it is beneficial to realize transmission of pump light to the first dichroic mirror or reception of pump light transmitted by the first dichroic mirror. The second pump fiber 601 of the second pump collimator 60 is used to realize transmission of pump light, that is, it is beneficial to realize transmission of pump light to the second dichroic mirror or reception of pump light transmitted by the second dichroic mirror.
Referring to fig. 1, in one embodiment, when the gain device includes both the first pump collimator and the second pump collimator, the first pump light and the second pump light are not emitted simultaneously. Specifically, when the first pump collimator 30 transmits the first pump light to the first dichroic mirror 40, the first pump light and the signal light are transmitted in the same direction in the laser crystal structure 10, the positive pump gain of the signal light is realized by the first pump light, a residual portion of the first pump light emitted from the laser crystal structure 10 is reflected to the second pump collimator 60 by the second dichroic mirror 50, the second pump collimator 60 receives the residual portion of the first pump light reflected by the second input optical path of the second dichroic mirror 50, and outputs the residual portion through the second pump fiber 601 of the second pump collimator, in this case, the first pump collimator 30 emits the first pump light, and the second pump collimator 60 receives the residual portion of the first pump light; when the second pump collimator 60 transmits the second pump light to the second dichroic mirror 50, the second pump light and the signal light are transmitted in opposite directions in the laser crystal structure, the second pump light realizes the inverse pump gain of the signal light, a residual portion of the second pump light emitted from the laser crystal structure 10 is emitted to the first pump collimator 30 through the first dichroic mirror 40, the first pump collimator 30 receives a residual portion of the second pump light reflected by the second input optical path of the first dichroic mirror 40, and is output through the first pump fiber 301 of the first pump collimator 30, in this case, the second pump collimator 60 emits the second pump light, and the first pump collimator 30 receives the residual portion of the second pump light.
It is noted that in some other embodiments, the gain device comprises one of the first pump collimator 30 or the second pump collimator 60; the gain device comprises a first pump collimator 30, see fig. 2, in which case the first pump collimator emits first pump light, the gain device having only a positive pump gain function; alternatively, the gain device comprises a second pump collimator 60, see fig. 3, in which case the second pump collimator emits the second pump light, the gain device having only an anti-pump gain function.
Referring to fig. 1, in an embodiment, when the gain device includes both the first pump collimator and the second pump collimator, since the gain device has both the positive pump gain function and the negative pump gain function, the output light transmitted by the output optical path of the first dichroic mirror 40 may include the signal light and the pump light; the output light emitted from the output end of the laser crystal may include pump light and signal light after gain. The light transmitted on the first output optical path of the second dichroic mirror 50 is the signal light after gain, and the light transmitted on the second output optical path of the second dichroic mirror 50 is the residual pump light. The light transmitted on the first input optical path of the first dichroic mirror 40 is signal light, and the light transmitted on the second input optical path of the first dichroic mirror 40 is pump light.
Referring to fig. 1, in an embodiment, the signal input collimator 20 is configured to input a signal light of a previous stage, the first pump collimator 30 is configured to input a first pump light, the signal light and the first pump light are combined by a first dichroic mirror 40, and then enter a laser medium 101 of the laser crystal structure 10, the signal light gained by the laser medium 101 passes through a second dichroic mirror 50, and is coupled into the signal output collimator 70 and output by a signal output fiber 701 thereof, and a residual part of the first pump light is output from the laser medium 101, and is transmitted and coupled to the second pump collimator 60 by the second dichroic mirror 50, and output by a second pump fiber 601 thereof.
Referring to fig. 1-3, in some embodiments, the laser crystal structure 10 includes a laser medium 101 and a heat sink 102, the laser medium 101 being secured to the heat sink 102. Heat dissipation from the laser medium 101 may be achieved by the heat sink 102. In one embodiment, the collimated spot size of the first pump collimator 30 and the second pump collimator 60 is also smaller than the clear aperture of the laser medium 101, so that the pump light can pass through the laser medium 101 to the maximum extent, and the signal light can obtain higher gain. In addition, the parameters of the signal input fiber 201 of the signal input collimator 20, the parameters of the first signal lens 202, the parameters of the signal output fiber 701 of the signal output collimator 70, and the parameters of the second signal lens 702 are determined according to actual requirements, and the four parameters are matched with each other, so that the signal input collimator 20 and the signal output collimator 70 have the function of a mode field adapter, and simultaneously, the Gaussian beam transmitted between the two has a spot size smaller than the clear aperture of the laser medium 101, so that the signal light can be transmitted with maximum efficiency.
Referring to fig. 1 to 3, in some embodiments, the laser crystal structure 10 further includes a wrapping layer (not shown) wrapping the outer surface of the laser medium, the wrapping layer is made of indium foil; the laser medium 101 is a laser crystal, laser ceramic, or single crystal fiber. The laser medium 101 includes a host crystal and dopant ions; the substrate crystal is any one of yttrium vanadate crystal, yttrium aluminum garnet crystal, KGW crystal, KYW crystal, calcium fluoride crystal or quartz crystal; the dopant ions include Nd 3+ 、Yb 3+ 、Er 3 + 、Tm 3+ Or Ho 3+ At least one of (1).
Referring to fig. 1 to 3, in some embodiments, the gain apparatus further includes a housing 80, and the first dichroic mirror 40, the laser crystal structure 10, and the second dichroic mirror 50 are packaged in the housing 80; the signal input collimator 20 and the signal output collimator 70 are fixed to the housing 80.
Referring to fig. 1, in one embodiment, a signal is input to a collimator 20, a first dichroic mirror 40, and a first pump collimator 30, which together form a first micro-optical combiner functional region 1; the signal output collimator 70, the second dichroic mirror 50, and the second pump collimator 60 together form a second micro-optical beam combiner functional region 2.
In one or more embodiments, the present disclosure also provides a gain method comprising a positive pump gain method and a negative pump gain method.
Illustratively, the positive pump gain method employs the gain apparatus of fig. 1 or fig. 2, the positive pump gain method comprising: receiving the signal light of the previous stage through the signal input fiber of the signal input collimator 20, and transmitting the signal light to the first dichroic mirror 40 through the signal input collimator 20; the signal light transmitted out via the first dichroic mirror 40 enters the laser crystal structure 10. Transmitting first pump light in the same direction as the signal light transmitted through the first dichroic mirror to the laser crystal structure 10, specifically, receiving the external first pump light through a first pump fiber 301 of the first pump collimator 30, and transmitting the first pump light to the first dichroic mirror 40 through the first pump collimator 30, where the first pump light is emitted from a first pump lens 302 of the first pump collimator 30; the first pump light reflected by the first dichroic mirror 40 and the signal light transmitted by the first dichroic mirror are transmitted in the same direction, the first dichroic mirror 40 combines the first pump light and the signal light to form a combined light, and the combined light enters the laser medium 101 of the laser crystal structure 10. The signal light transmitted by the first dichroic mirror 40 is subjected to gain by the laser crystal structure 10; the gained signal light output from the laser crystal structure 10 is optically coupled to the signal output collimator 70 by the second dichroic mirror 50, and the gained signal light is output again by the signal output fiber 701. Referring to fig. 1, a residual part of the first pump light emitted from the laser medium 101 of the laser crystal structure 10 is transmitted and coupled to the second pump collimator 60 through the second dichroic mirror 50, and the residual part of the first pump light is output by the second pump fiber 601 of the second pump collimator 60; referring to fig. 2, the residual part of the first pump light emitted from the laser medium 101 of the laser crystal structure 10 is reflected by the second dichroic mirror 50 and then directly output as spatial light.
In the positive pump gain method, the optical path of the signal light in the gain device is: the signal light is input from the signal input collimator 20 and transmitted to the first dichroic mirror 40, the laser crystal structure 10, the second dichroic mirror 50, and the signal output collimator 70 in sequence. The signal light after the gain is output from the signal output fiber of the signal output collimator 70. The optical path of the pump light in the gain device is as follows: the first pump light is input from the first pump collimator 30 and is sequentially transmitted to the first dichroic mirror 40, the laser crystal structure 10, the second dichroic mirror 50, and the second pump collimator 60. After passing through the laser crystal structure, the residual part of the first pump light is reflected by the second dichroic mirror and coupled to the second pump collimator, and the residual part of the first pump light is guided out by the second pump fiber 601 of the second pump collimator 60, or the residual part of the first pump light is directly output as space light.
Illustratively, the gain apparatus of fig. 1 or fig. 3 is used in an anti-pump gain method, which includes: receiving the signal light of the previous stage through the signal input fiber of the signal input collimator 20, and transmitting the signal light to the first dichroic mirror 40 through the signal input collimator 20; the signal light transmitted out via the first dichroic mirror 40 enters the laser crystal structure 10. The second pump light in the opposite direction to the signal light transmitted through the first dichroic mirror 40 is transmitted to the laser crystal structure 10, specifically, the second pump light outside is received through the second pump fiber 601 of the second pump collimator 60, and the second pump light is emitted from the second pump lens 602 of the second pump collimator 60, so that the second pump light is transmitted to the second dichroic mirror 50 through the second pump collimator 60, and the second pump light reflected by the second dichroic mirror 50 and the signal light transmitted through the first dichroic mirror 40 are transmitted in the opposite direction and enter the laser crystal structure 10. The signal light transmitted by the first dichroic mirror 40 is subjected to gain by the laser crystal structure 10; the gained signal light output from the laser crystal structure 10 is coupled to the signal output collimator 70 by the second dichroic mirror 50, and then transmitted by the signal output fiber 701. Referring to fig. 1, a residual part of the second pump light emitted from the laser medium 101 of the laser crystal structure 10 is transmitted and coupled to the first pump collimator 30 through the first dichroic mirror 40, and the residual part of the second pump light is output by the first pump fiber 301 of the first pump collimator 30; alternatively, as shown in fig. 3, the residual part of the second pump light emitted from the laser medium 101 of the laser crystal structure 10 is reflected by the first dichroic mirror 40 and then directly output as spatial light.
In the inverse pump gain method, the optical path of the signal light in the gain device is: the signal light is input from the signal input collimator 20 and is sequentially transmitted to the first dichroic mirror 40, the laser crystal structure 10, the second dichroic mirror 50, and the signal output collimator 70. The signal light after the gain is output from the signal output fiber 701 of the signal output collimator 70. The optical path of the pump light in the gain device is as follows: the second pump light is input from the second pump collimator 60 and is sequentially transmitted to the second dichroic mirror 50, the laser crystal structure 10, the first dichroic mirror 40, and the first pump collimator 30. After passing through the laser crystal structure, the residual part of the second pump light is reflected by the first dichroic mirror and coupled to the first pump collimator, and the residual part of the second pump light is guided out by the first pump fiber 301 of the first pump collimator 30, or the residual part of the second pump light is directly output as space light.
It should be noted that when the gain is increased by using the same gain device, the positive pump gain and the negative pump gain do not occur simultaneously.
In summary, the gain apparatus and the gain method provided by the present disclosure are implemented by coupling a spatial coupling micro-optical device in a fiber laser: micro-optics beam combiner, mode field adapter, and optical element in solid laser: the laser medium dichroic mirror and the like are integrated, designed and coupled and packaged, so that the light path structure is simplified, the overall size of the laser is reduced, the packaging is convenient, and the laser has a higher gain effect; meanwhile, the output of signal light is realized by using the optical fiber in the solid laser, and the output light is simpler.
The above description is intended only to serve as an alternative embodiment of the disclosure, and not as a limitation on the disclosure, and any modification, equivalent replacement, and improvement made within the spirit and principle of the disclosure should be included in the scope of the disclosure.

Claims (10)

1. A gain apparatus, comprising:
a first dichroic mirror;
a signal input collimator configured to transmit signal light to the first dichroic mirror;
a laser crystal structure configured to receive the signal light transmitted out by the first dichroic mirror;
a second dichroic mirror configured to receive the signal light emitted from the laser crystal; and
a signal output collimator configured to receive the signal light transmitted by the second dichroic mirror;
the gain device further comprises a first pump collimator configured to transmit first pump light to the first dichroic mirror, the first dichroic mirror further configured to reflect the first pump light to the laser crystal structure, and a second pump collimator configured to receive and derive a residual portion of the first pump light reflected off the laser crystal structure by the second dichroic mirror;
the second pump collimator is configured to transmit second pump light to the second dichroic mirror, the second dichroic mirror is further configured to reflect the second pump light to the laser crystal structure, and the first pump collimator is configured to receive and derive a residual portion of the second pump light emitted from the laser crystal structure reflected by the first dichroic mirror.
2. The gain device as claimed in claim 1, wherein said laser crystal structure comprises a laser medium, said laser medium being a laser crystal, a laser ceramic or a single crystal optical fiber.
3. The gain device of claim 2, wherein spot matching between the signal input collimator and the signal output collimator; the spot diameter of the signal light output by the signal input collimator is smaller than the clear aperture of the laser medium.
4. The gain device of any of claims 1 to 3, further comprising a housing in which the first dichroic mirror, the laser crystal structure, and the second dichroic mirror are encapsulated;
the signal input collimator and the signal output collimator are fixed on the shell;
the first pump collimator and the second pump collimator are fixed on the shell.
5. A gain device as claimed in claim 2 or 3, wherein said lasing medium comprises a host crystal and dopant ions; the substrate crystal is any one of yttrium vanadate crystal, yttrium aluminum garnet crystal, KGW crystal, KYW crystal, calcium fluoride crystal or quartz crystal; the dopant ions include Nd 3+ 、Yb 3+ 、Er 3+ 、Tm 3+ Or Ho 3+ At least one of (1).
6. A gain apparatus, comprising:
a first dichroic mirror;
a signal input collimator configured to transmit signal light to the first dichroic mirror;
a laser crystal structure configured to receive the signal light transmitted out by the first dichroic mirror;
a second dichroic mirror configured to receive the signal light emitted from the laser crystal; and
a signal output collimator configured to receive the signal light transmitted out by the second dichroic mirror;
the gain device further includes a first pump collimator configured to transmit first pump light to the first dichroic mirror, the first dichroic mirror further configured to reflect the first pump light to the laser crystal structure, the second dichroic mirror further configured to reflect a remainder of the first pump light exiting the laser crystal structure.
7. A gain apparatus, comprising:
a first dichroic mirror;
a signal input collimator configured to transmit signal light to the first dichroic mirror;
a laser crystal structure configured to receive the signal light transmitted out by the first dichroic mirror;
a second dichroic mirror configured to receive the signal light emitted from the laser crystal; and
a signal output collimator configured to receive the signal light transmitted out by the second dichroic mirror;
the gain device further comprises a second pump collimator configured to transmit a second pump light to the second dichroic mirror, the second dichroic mirror further configured to reflect the second pump light to the laser crystal structure, the first dichroic mirror further configured to reflect a remainder of the second pump light exiting the laser crystal structure.
8. A method of gain, comprising:
transmitting the signal light to a first dichroic mirror through a signal input collimator;
the signal light transmitted by the first dichroic mirror enters a laser crystal structure;
transmitting first pump light in the same direction as the signal light transmitted through the first dichroic mirror to the laser crystal structure, or transmitting second pump light in the opposite direction to the signal light transmitted through the first dichroic mirror to the laser crystal structure;
gaining the signal light transmitted by the first dichroic mirror through the laser crystal structure;
optically coupling the gained signal output by the laser crystal structure to a signal output collimator through a second dichroic mirror;
reflecting a remaining portion of the first pump light emitted from the laser crystal structure by the second dichroic mirror or reflecting a remaining portion of the second pump light emitted from the laser crystal structure by the second dichroic mirror.
9. The gain method according to claim 8, wherein said transmitting the first pump light to the laser crystal structure in the same direction as the signal light transmitted through the first dichroic mirror comprises:
transmitting first pump light to the first dichroic mirror through a first pump collimator,
the first pump light reflected by the first dichroic mirror and the signal light transmitted by the first dichroic mirror are transmitted in the same direction, and combined beams enter the laser crystal structure;
the transmitting, to the laser crystal structure, the second pump light in a reverse direction to the signal light transmitted through the first dichroic mirror includes:
transmitting a second pump light to the second dichroic mirror through a second pump collimator,
and the second pumping light reflected by the second dichroic mirror and the signal light transmitted by the first dichroic mirror are reversely transmitted and enter the laser crystal structure.
10. The gain method of claim 9, wherein said reflecting a remaining portion of said first pump light exiting said laser crystal structure by said second dichroic mirror comprises:
receiving and deriving, by the second pump collimator, a residual portion of the first pump light emitted from the laser crystal structure reflected by the second dichroic mirror;
the reflecting, by the second dichroic mirror, a remaining portion of the second pump light exiting the laser crystal structure includes:
receiving and deriving, by the first pump collimator, a residual portion of the second pump light emitted from the laser crystal structure reflected by the first dichroic mirror.
CN202210909577.9A 2022-07-29 2022-07-29 Gain device and gain method Pending CN115173197A (en)

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Application Number Priority Date Filing Date Title
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