CN116544764A - Miniature collinear laser and design method thereof - Google Patents

Miniature collinear laser and design method thereof Download PDF

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Publication number
CN116544764A
CN116544764A CN202310500088.2A CN202310500088A CN116544764A CN 116544764 A CN116544764 A CN 116544764A CN 202310500088 A CN202310500088 A CN 202310500088A CN 116544764 A CN116544764 A CN 116544764A
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laser
crystal
module
amplifying
pump light
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张静思
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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
    • H01S3/094049—Guiding of the pump 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
    • H01S3/0941—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
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/10007—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers
    • H01S3/1001—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers by controlling the optical 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
    • H01S5/005—Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping
    • 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
    • H01S5/04—Processes or apparatus for excitation, e.g. pumping, e.g. by electron beams
    • H01S5/041—Optical pumping
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
    • Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation

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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 invention discloses a miniature collinear laser and a design method thereof, wherein the laser comprises a pumping light source, a laser crystal, a shaping module and an amplifying crystal; the pump light source, the laser crystal, the shaping module and the amplifying crystal are sequentially arranged along the optical path of the pump light output by the pump light source; the pump light source outputs pump light to the laser crystal, part of the pump light is absorbed by the laser crystal and excites seed laser, the seed laser and the other part of pump light are transmitted to the shaping module, the seed laser and the other part of pump light are transmitted to the amplifying crystal after being shaped by the shaping module, a laser spot and a pump spot are formed on one side of the amplifying crystal close to the shaping module, and amplified by the amplifying crystal and output amplified laser; the laser spot and the pumping spot are concentric and the diameter ratio of the spots is within a threshold range. The technical scheme of the embodiment of the invention solves the problems that the pump light cannot be fully absorbed to cause waste and the traditional multi-optical-path laser amplifier is too large in size and not suitable for a micro laser, and achieves the effects of improving the utilization rate of the pump light and achieving compact structure.

Description

Miniature collinear laser and design method thereof
Technical Field
The invention relates to the technical field of lasers, in particular to a miniature collinear laser and a design method thereof.
Background
A laser in which a solid laser material is used as a working substance. The working medium is a crystal or glass as a matrix material with a small amount of activator ions homogeneously incorporated therein. For example: a laser incorporating trivalent neodymium ions in Yttrium Aluminum Garnet (YAG) crystals may emit near infrared laser light having a wavelength of 1064 nanometers.
In order to emit laser beams with higher energy, a semiconductor laser pumping mode is often adopted to pump seed lasers, a traditional laser power amplifier generally comprises a seed laser and a power amplifier part, the power amplifier consists of a pumping source and an amplifying crystal, the seed lasers and a pumping light path are arranged in a beam path dividing mode, pump source light spots of the seed lasers and the amplifying stage are respectively shaped, and the seed lasers and the pumping source light spots of the amplifying stage are respectively shaped, so that the mode matching is achieved at the amplifying crystal to extract pumping energy, and the effect of amplifying the seed laser power is achieved. Under the mode, the seed light and the pump light are respectively shaped, so that the structure is complex, the volume is large, and the utilization rate of the pump light energy is low.
Disclosure of Invention
The invention provides a miniature collinear laser and a design method thereof, which are used for solving the problems that pump light cannot be fully absorbed and excited into seed laser to cause waste and the designed light path of a traditional multi-light path laser amplifier is overlarge in volume and not suitable for a miniature or miniature laser.
According to an aspect of the present invention, there is provided a micro collinear laser, including a pump light source, a laser crystal, a shaping module, and an amplifying crystal;
the pumping light source, the laser crystal, the shaping module and the amplifying crystal are sequentially arranged along the optical path of the pumping light output by the pumping light source;
the pump light source outputs pump light to the laser crystal, part of the pump light is absorbed by the laser crystal and excites seed laser, the seed laser and the other part of pump light are transmitted to the shaping module, shaped by the shaping module and transmitted to the amplifying crystal, a laser spot and a pump spot are formed on one side of the amplifying crystal close to the shaping module respectively, amplified by the amplifying crystal and output amplified laser;
the laser light spot and the pumping light spot are concentric, and the ratio of the diameter of the light spot is within a threshold range.
Optionally, the incident surface of the amplifying crystal is located at the beam waist of the light beam output by the shaping module.
Optionally, the laser crystal comprises a bonded microchip crystal.
Optionally, the micro collinear laser further comprises a filtering module, and the filtering module is located on the light path of the light beam emitted by the amplifying crystal;
the amplifying crystal outputs a light beam to the filtering module, and the filtering module filters the pump light and transmits amplified laser.
Optionally, the micro collinear laser further comprises a focusing module;
the focusing module is positioned between the pumping light source and the laser crystal;
the pump light source outputs pump light to the focusing module, and the pump light enters the laser crystal after being focused by the focusing module.
Optionally, the micro collinear laser further comprises a coupling module; the input end of the coupling module is connected with the pumping light source;
the pump light source outputs pump light, the pump light enters the coupling module from the input end of the coupling module, and the pump light is output from the output end after being coupled by the coupling module.
Optionally, the shaping module includes a self-focusing lens.
According to another aspect of the present invention, there is provided a method for designing a micro collinear laser, which is characterized in that the micro collinear laser includes a pumping light source, a laser crystal, a shaping module and an amplifying crystal; the pumping light source, the laser crystal, the shaping module and the amplifying crystal are sequentially arranged along the optical path of the pumping light output by the pumping light source;
the design method comprises the following steps:
simulating a working light path of the micro collinear laser; adjusting the position of the shaping module along the direction perpendicular to the propagation direction of the light beam;
when the laser light spot and the pumping light spot of the incidence surface of the amplifying crystal are concentric, the position information of the shaping module is determined and marked as first shaping position information; adjusting the positions of the laser crystal, the shaping module and the amplifying crystal along the direction parallel to the propagation direction of the light beam to obtain energy values of a plurality of groups of amplifying crystal output amplified laser;
when the energy value of the amplified laser is determined to be the maximum value, the relative position information of the laser crystal, the shaping module and the amplified crystal is marked as second shaping position information;
acquiring position information of the pumping light source;
the micro collinear laser is constructed from a plurality of position information.
Optionally, the adjusting the positions of the laser crystal, the shaping module and the amplifying crystal along the direction parallel to the propagation direction of the light beam, and obtaining the energy values of the laser amplified by the amplifying crystal output by multiple groups includes:
determining a maximum value L1 and a minimum value L2 of the distance between the laser crystal and the amplifying crystal according to the cavity length of the micro collinear laser;
and according to the maximum value L1 and the minimum value L2, taking s as a reference, obtaining 2n+1 groups of relative distance parameters:
under 2n+1 sets of relative distance parameters, adjusting the position of the shaping module along a direction parallel to the propagation direction of the light beam;
acquiring a plurality of groups of energy values of amplified lasers output by the amplifying crystals;
where s is the minimum precision of the distance adjustment, n=0, 1,2, … … N, N is a positive integer.
Optionally, the micro collinear laser further comprises a focusing module, and the focusing module is located between the pumping light source and the laser crystal;
before the step of acquiring the position information of the pumping light source, the method further comprises the following steps:
adjusting the position of the focusing module along a direction perpendicular to the propagation direction of the light beam;
determining the position information of the focusing module when the light spot on the incidence surface of the laser crystal is concentric with the incidence surface, and marking the position information as first focusing position information;
adjusting the position of the focusing module along the direction parallel to the propagation direction of the light beam to obtain the spot sizes of a plurality of groups of incidence surfaces of the laser crystals;
and when the spot size of the incidence surface of the laser crystal is determined to be minimum, the position information of the focusing module is marked as second focusing position information.
According to the technical scheme provided by the embodiment of the invention, the residual pump light which is not absorbed by the laser crystal is utilized, and the shaping module is arranged, so that the seed laser and the residual pump light form a facula which is concentric with a center and has a diameter ratio within a threshold range on the incidence surface of the amplifying crystal, further the maximum amplifying effect is realized, the influence of the absorption efficiency of the laser crystal is solved, the waste caused by the fact that the pump light cannot be fully excited into the seed laser is solved, the problem that the designed optical path volume of the traditional multi-optical-path laser amplifier is too large and is not suitable for a small-sized or miniature laser is solved, and the effects of improving the utilization rate of the pump light and having a compact structure are realized.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a micro collinear laser according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an incidence plane light spot of an amplifying crystal according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a second micro-collinear laser according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of an optical path of a micro collinear laser according to an embodiment of the present invention;
FIG. 5 is a flow chart of a design method of a micro collinear laser according to an embodiment of the present invention;
FIG. 6 is a flow chart of another method for designing a micro collinear laser according to an embodiment of the present invention;
fig. 7 is a timing chart of amplifying laser energy and output according to an embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Fig. 1 is a schematic structural diagram of a micro collinear laser according to an embodiment of the present invention, and fig. 2 is a schematic structural diagram of an amplifying crystal incident surface light spot according to an embodiment of the present invention. As shown in fig. 1, the laser includes a pump light source 10, a laser crystal 20, a shaping module 30, and an amplifying crystal 40; the pump light source 10, the laser crystal 20, the shaping module 30 and the amplifying crystal 40 are sequentially arranged along the optical path of the pump light output by the pump light source 10; the pump light source 10 outputs pump light to the laser crystal 20, part of the pump light is absorbed by the laser crystal 20 and excites seed laser, the seed laser and the other part of pump light are transmitted to the shaping module 30, shaped by the shaping module 30 and transmitted to the amplifying crystal 40, a laser spot A and a pump spot B shown in figure 2 are formed on one side of the amplifying crystal 40 close to the shaping module respectively, amplified by the amplifying crystal 40, and amplified laser is output. The laser light spot and the pumping light spot are concentric, and the diameter ratio of the light spot is within a threshold range.
The pump light source 10 includes a semiconductor Laser Diode (LD), and the actual specification of the pump light source 10 may be set according to the actual requirement, for example, according to the type of the laser crystal 20, for example, a pump light source of 808nm LD of 3W. The type and specification of the laser crystal 20 can be set according to the use requirement of the laser and the laser output requirement of the laser, for example, the laser crystal 20 is set as a microchip crystal with smaller volume according to the application scene of the laser, the laser crystal 20 is set as a bonding YAG crystal of (Nd: YAG+Cr: YAG) according to the laser output requirement as output 1064nm laser. The shaping module 30 includes, but is not limited to, a self-focusing lens, but may be another spherical lens, an aspherical lens or a lens group with a strong focusing capability, and the actual specification of the shaping module 30 may be set according to the relative positions and specifications of the rest components of the laser, and the divergence angle of the seed laser and the pump light output by the laser crystal 20, for example, a self-focusing lens with a pitch of 0.23P, so that the seed laser and the remaining pump light can be matched in space and time dimensions. The amplifying crystal 40 may be YVO 4 And the crystal is used for absorbing the pump light and amplifying the seed laser. The ratio of the spot diameter of the laser spot to the pump spot can be 0.6-0.8, and the diameter of the laser spot is smaller than the diameter of the pump spot.
Specifically, in the actual working process of the laser, since the absorption rate of the laser crystal 20 to the pump light cannot reach 100%, the pump light part emitted by the pump light source 10 is excited by the laser crystal 20 to form seed laser, another part of pump light is output by the laser crystal 20 together with the seed laser, the divergence angles of the pump light and the seed laser are different, after the pump light is transmitted to the shaping module 30, the shaping module 30 shapes the divergence angles of the pump light, so that the seed laser and the pump light form a light spot concentric on the incident surface of the amplifying crystal 40, the light spot size can reach pattern matching, the amplifying crystal 40 can achieve the amplifying effect to the greatest extent, the residual pump light is fully utilized, a plurality of components are arranged in a collinear manner, the structure of the laser can be more compact, and the laser can be integrated in a weather radar system, a laser ranging system, a measuring system and the like.
According to the technical scheme provided by the embodiment of the invention, the residual pump light which is not absorbed by the laser crystal is utilized, and the shaping module is arranged, so that the seed laser and the residual pump light form a facula which is concentric with a center and has a diameter ratio within a threshold range on the incidence surface of the amplifying crystal, further the maximum amplifying effect is realized, the influence of the absorption efficiency of the laser crystal is solved, the waste caused by the fact that the pump light cannot be fully excited into the seed laser is solved, the problem that the designed optical path volume of the traditional multi-optical-path laser amplifier is too large and is not suitable for a small-sized or miniature laser is solved, and the effects of improving the utilization rate of the pump light and having a compact structure are realized.
Optionally, the entrance face of the amplifying crystal 40 is located at the beam waist of the output beam of the shaping module 30.
Wherein the shaping module 30 outputs a beam comprising the shaped seed laser and the remaining pump light. The beam waist of the output beam can be obtained by an analog optical path during the design phase of the laser.
Specifically, the beam waist of the light beam is the position with the smallest beam section diameter, the shaped seed laser and the residual pump light are converged to the amplifying crystal 40, it can be understood that the converged light is converged and diverged in the propagation process, and the converged position of the light is the beam waist position of the light beam, so that the incident surface of the amplifying crystal 40 is arranged at the beam waist position of the shaping module 30, the spot sizes of the seed laser and the residual pump light on the incident surface are approximately equal and are concentric, and the light focusing point is generally stronger in beam energy, so that the amplifying effect of the amplifying crystal is improved.
Optionally, fig. 3 is a schematic structural diagram of a second micro co-linear laser according to an embodiment of the present invention, as shown in fig. 3, where the micro co-linear laser according to the embodiment of the present invention further includes a focusing module 50; the focusing module 50 is located between the pump light source 10 and the laser crystal 20; the pump light source 10 outputs pump light to the focusing module 50, and the pump light is focused by the focusing module 50 and then enters the laser crystal 20.
The focusing module 50 includes, but is not limited to, a self-focusing lens, and may be set as a spherical lens or an aspherical lens or a lens group according to actual requirements, and an actual specification of the focusing module 50, such as a focal length, may be set according to a relative position of the rest components of the laser and the actual specification.
Specifically, the focusing module 50 is disposed between the pump light source 10 and the laser crystal 20, the pump light source outputs divergent pump light, the pump light is incident to the focusing module 50, and further incident to the laser crystal 20 after focusing, thereby improving the utilization rate of the pump light and the energy of the amplified laser output by the laser.
Optionally, with continued reference to fig. 1 or fig. 2, the micro collinear laser provided in an embodiment of the present invention further includes a coupling module 60; the input end 61 of the coupling module 60 is connected with the pump light source 10; the pump light source 10 outputs pump light, and the pump light enters the coupling module 60 from the input end 61 of the coupling module 60, is coupled by the coupling module 60, and is output from the output end 62.
The coupling module 60 may be a coupling fiber, and is configured to couple the divergent pump light output by the pump light source 10.
Specifically, the input end 61 of the coupling module 60 is connected with the pump light source 10, the pump light source 10 outputs pump light, the pump light enters the coupling module 60 from the input end 61 of the coupling module 60, and is output from the output end 62 after being coupled by the coupling module 60, so that the divergent pump light can be transmitted along the output direction of the output end 62, and the utilization rate of the pump light is improved.
Optionally, with continued reference to fig. 1 or fig. 3, the micro collinear laser provided in the embodiment of the present invention further includes a filtering module 70, where the filtering module 70 is located on an optical path of the light beam emitted from the amplifying crystal 40; the amplifying crystal 40 outputs a light beam to the filtering module 70, and the filtering module 70 filters the pump light and transmits the amplified laser light.
Wherein the filtering module 70 includes, but is not limited to, a dichroic mirror.
Specifically, the seed laser and the pump light emitted from the shaping module 30 are incident to the amplifying crystal 40, and are amplified by the amplifying crystal 40 and then emitted as amplified laser, it is understood that the amplifying crystal 40 cannot absorb all the pump light, the emitted amplified laser still includes part of the pump light, and the filtering module 70 is disposed on the emitting optical path of the amplifying crystal 40 to filter the pump light in the beam, thereby improving the quality of the laser emitted from the laser.
Based on the same conception, the technical scheme of the embodiment of the invention also provides a design method of the micro collinear laser, and the method can be used for designing any micro collinear laser provided by the embodiment of the invention. Fig. 4 is a schematic diagram of an optical path of a micro co-linear laser according to an embodiment of the present invention, as shown in fig. 4, the micro co-linear laser includes a pumping light source 10, a laser crystal 20, and an amplifying crystal 40 of a shaping module 30; the pump light source 10, the laser crystal 20, the shaping module 30 and the amplifying crystal 40 are sequentially arranged along an optical path of the pump light output from the pump light source 10. Fig. 5 is a flowchart of a design method of a micro collinear laser according to an embodiment of the present invention, as shown in fig. 5, where the design method includes:
s10, simulating a working light path of the micro collinear laser.
The working light path is that the pumping light source 10 emits pumping light, after the pumping light is incident to the laser crystal 20, part of the pumping light is absorbed and excited to emit seed laser, part of the seed laser and the seed laser are transmitted to the shaping module 30 together, the seed laser and the pumping light are shaped by the shaping module 30 and then are incident to the amplifying crystal 40, and the amplifying crystal 40 amplifies and emits the seed laser to be amplified laser. The analog working light path can be realized by zemax simulation.
Specifically, in the actual working process of the laser, it is required to ensure that the seed laser and the remaining pump light which is not absorbed are shaped by the shaping module 30, and the light spots formed when the seed laser and the remaining pump light are incident to the incident surface of the amplifying crystal 40 are concentric and have the size within the threshold range, so that the relative positions of the laser components and the actual specifications of the components need to be simulated, and the overall framework of the laser when the amplifying effect of the laser is optimal is obtained by adjusting parameters.
S21, adjusting the position of the shaping module along the direction perpendicular to the propagation direction of the light beam.
Specifically, when the optical path of the laser is designed, the optical axis of the shaping module needs to be collinear with other components, so that the fact that the seed laser and the pump light form light spots at the amplifying crystal can be guaranteed to be in the same circle center.
S22, determining the position information of the shaping module when the laser light spot and the pumping light spot of the incidence surface of the amplifying crystal are concentric, and marking the position information as first shaping position information.
The first shaping position information is the position when the shaping module and the rest components share the optical axis.
Specifically, when the laser spot and the pumping spot on the incidence surface of the amplifying crystal are concentric, the position information of the shaping module is marked as first shaping position information, so that the shaping module of the laser can share the optical axis with other components.
S23, adjusting the positions of the laser crystal, the shaping module and the amplifying crystal along the direction parallel to the propagation direction of the light beam, and obtaining the energy values of the amplified laser output by a plurality of groups of amplifying crystals.
The multiple groups of amplifying crystals output energy values of amplified laser, and the energy values correspond to multiple relative positions of the shaping module, the laser crystal and the amplifying crystal.
Specifically, when the shaping module, the laser crystal and the amplifying crystal are relatively different, the shaping effect and the amplifying effect of the seed laser and the pump light are different, the energy values of the amplified laser output by the amplifying crystals are obtained, and then the relative positions of the shaping module, the laser crystal and the amplifying crystal are obtained when the laser spots and the pump spots are matched in size.
And S24, when the energy value of the amplified laser is determined to be the maximum value, the relative position information of the laser crystal, the shaping module and the amplifying crystal is marked as second shaping position information.
The second shaping position information is relative position information of the shaping module, the laser crystal and the amplifying crystal when the spot sizes of the laser spot and the pumping spot are matched.
Specifically, when the spot sizes of the laser spot and the pumping spot are matched, the amplifying effect of the amplifying crystal is optimal, and when the amplifying crystal is implemented, the amplifying effect can be determined according to the energy value of laser and performance parameters similar to the divergence angle of the laser. And determining the corresponding positions of the shaping module, the laser crystal and the amplifying crystal, so that the laser can output higher energy of laser when the laser is manufactured.
S30, acquiring position information of the pumping light source.
S40, constructing a micro collinear laser according to the plurality of position information.
Wherein the plurality of position information is position information of a plurality of components of the laser.
According to the technical scheme provided by the embodiment of the invention, the working light path of the laser is simulated, and the position information capable of realizing the maximum amplification effect is obtained by adjusting the position of the shaping module, so that the quality of the laser beam output by the laser is ensured.
Optionally, step S23 shown in fig. 6 includes:
the maximum value L1 and the minimum value L2 of the distance between the laser crystal and the amplifying crystal are determined according to the parameters of the micro collinear laser.
The parameters of the micro collinear laser include, but are not limited to, parameters of pump light output by a pump light source, specifications of a laser crystal, specifications of an amplifying crystal and cavity length of the laser, and when in implementation, the maximum value L1 and the minimum value L2 can be determined according to empirical values or theoretical calculation.
Specifically, the amplifying effect of the amplifying crystal is related to the distance between the laser crystal and the amplifying crystal and the shaping effect of the shaping module, when the rest parameters of the laser are determined, the relative positions between the laser crystal and the amplifying crystal with the optimal amplifying effect and the worst amplifying effect exist, and the maximum value and the minimum value of the distance between the laser crystal and the amplifying crystal are determined according to the parameters of the laser, so that the range is provided for the position information of the shaping module to be determined later.
Based on the maximum value L1 and the minimum value L2, s is taken as a reference to obtain 2n+1 groups of relative distance parameters:
where s is the minimum precision of the distance adjustment, n=0, 1,2, … … N, N is a positive integer. In specific implementation, the values of s and n can be set according to actual requirements and test conditions.
And under 2n+1 sets of relative distance parameters, adjusting the position of the shaping module along the direction parallel to the propagation direction of the light beam.
Specifically, when the distance between the amplifying crystal and the laser crystal is fixed, the shaping module is located at different positions, shaping effects on the seed laser and the pump laser are different, and the position of the shaping module is adjusted along the direction parallel to the propagation direction of the light beam, so that position information with the best shaping effect is determined.
And acquiring energy values of the amplified lasers output by the plurality of groups of amplifying crystals.
Optionally, with continued reference to fig. 4, the micro-collinear laser further includes a focusing module 50, the focusing module 50 being located between the pump light source 10 and the laser crystal 20. Fig. 6 is a flowchart of another design method of a micro collinear laser according to an embodiment of the present invention.
As shown in fig. 6, before the step S30, the step of obtaining the position information of the pump light source further includes:
s25, adjusting the position of the focusing module along the direction perpendicular to the propagation direction of the light beam.
Specifically, when designing the light path of laser instrument, need guarantee that pumping light source output pumping light can be incident to the central point of laser crystal incident surface after focusing, focus module and the other subassemblies of laser instrument are the optical axis altogether promptly, and then make laser crystal output seed laser can be incident to the central point of plastic module, along the perpendicular to light beam propagation direction, adjust focus module's position, and then obtain the facula position.
S26, when the incidence surface light spot of the laser crystal and the incidence surface are concentric, the position information of the focusing module is determined, and the first focusing position information is marked.
The first focusing position information is the position when the shaping module and the rest components share the optical axis.
Specifically, when the incidence surface light spot of the laser crystal and the incidence surface are concentric, the position information of the focusing module is marked as first focusing position information, so that the focusing module of the laser can be ensured to share the optical axis with other components.
S27, adjusting the position of the focusing module along the direction parallel to the propagation direction of the light beam, and obtaining the spot sizes of a plurality of groups of laser crystal incidence surfaces.
The spot sizes of the incident surfaces of the laser crystals correspond to the positions of the focusing module.
Specifically, the focusing modules are located at different positions, the focusing effects of the pump light are different, the spot sizes of the incidence planes of the laser crystals are obtained, and then the positions of the focusing modules are obtained when the focusing effect is optimal.
And S28, determining the position information of the focusing module when the spot size of the incidence surface of the laser crystal is minimum, and marking the position information as second focusing position information.
Specifically, when the spot size of the incident surface of the laser crystal is minimum, the focusing effect of the focusing module is optimal, namely the utilization rate of the pumping light is highest, and the position corresponding to the focusing module is determined, so that the energy of the laser output by the laser is higher when the laser is manufactured.
In a specific embodiment, the pumping light source is 808nm LD pumping source with 3W, the tail fiber outputs, the fiber core is 62.5 μm, the focusing module is a self-focusing lens with a pitch of 0.23P, the laser crystal is (Nd: YAG+Cr: YAG) G3 bonding microchip crystal, the shaping module is a self-focusing lens with a pitch of 0.23P, and the amplifying crystal is YVO 4 The crystal is subjected to optical simulation to obtain the tail fiber with the distance of 2mm from the incidence surface of the focusing module and the focusingJiao Mokuai the distance of emitting face and laser crystal incident surface is 2mm, and the distance of emitting face of plastic module and laser crystal's emitting face is 2mm, and the distance of emitting face of plastic module and amplifying crystal's incident surface is 1.75mm, and seed laser 1's parameter is: 1064nm,50kHz,100mW,2 mu J and 500ps, the energy of the amplified laser emitted by the amplifying crystal is 5 mu J, and the energy is amplified by 2.5 times; the parameters of the seed laser 2 are: 1064nm,100kHz,100mW,1 mu J and 500ps, the energy of the amplified laser emitted by the amplifying crystal is 3 mu J, and the energy is amplified by 3 times. Fig. 7 is a timing chart of energy and output of amplified laser according to an embodiment of the present invention, and as shown in fig. 7, the laser according to the embodiment of the present invention can realize long-term stable power output of the amplified laser.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present invention may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present invention are achieved, and the present invention is not limited herein.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.

Claims (10)

1. The miniature collinear laser is characterized by comprising a pumping light source, a laser crystal, a shaping module and an amplifying crystal;
the pumping light source, the laser crystal, the shaping module and the amplifying crystal are sequentially arranged along the optical path of the pumping light output by the pumping light source;
the pump light source outputs pump light to the laser crystal, part of the pump light is absorbed by the laser crystal and excites seed laser, the seed laser and the other part of pump light are transmitted to the shaping module, shaped by the shaping module and transmitted to the amplifying crystal, a laser spot and a pump spot are formed on one side of the amplifying crystal close to the shaping module respectively, amplified by the amplifying crystal and output amplified laser;
the laser light spot and the pumping light spot are concentric, and the ratio of the diameter of the light spot is within a threshold range.
2. The micro-collinear laser of claim 1, wherein the entrance face of the amplifying crystal is located at the beam waist of the shaping module output beam.
3. The micro-collinear laser of claim 1, wherein said laser crystals comprise bonded microchip crystals.
4. The micro collinear laser of claim 1, further comprising a filtering module located on the optical path of the amplified crystal outgoing beam;
the amplifying crystal outputs a light beam to the filtering module, and the filtering module filters the pump light and transmits amplified laser.
5. The micro collinear laser of claim 1, further comprising a focusing module;
the focusing module is positioned between the pumping light source and the laser crystal;
the pump light source outputs pump light to the focusing module, and the pump light enters the laser crystal after being focused by the focusing module.
6. The micro collinear laser of claim 1, further comprising a coupling module; the input end of the coupling module is connected with the pumping light source;
the pump light source outputs pump light, the pump light enters the coupling module from the input end of the coupling module, and the pump light is output from the output end after being coupled by the coupling module.
7. The micro-collinear laser of claim 1, wherein said shaping module includes a self-focusing lens.
8. The design method of the miniature collinear laser is characterized in that the miniature collinear laser comprises a pumping light source, a laser crystal, a shaping module and an amplifying crystal; the pumping light source, the laser crystal, the shaping module and the amplifying crystal are sequentially arranged along the optical path of the pumping light output by the pumping light source;
the design method comprises the following steps:
simulating a working light path of the micro collinear laser;
adjusting the position of the shaping module along the direction perpendicular to the propagation direction of the light beam;
when the laser light spot and the pumping light spot of the incidence surface of the amplifying crystal are concentric, the position information of the shaping module is determined and marked as first shaping position information;
adjusting the positions of the laser crystal, the shaping module and the amplifying crystal along the direction parallel to the propagation direction of the light beam to obtain energy values of a plurality of groups of amplifying crystal output amplified laser;
when the energy value of the amplified laser is determined to be the maximum value, the relative position information of the laser crystal, the shaping module and the amplified crystal is marked as second shaping position information;
acquiring position information of the pumping light source;
the micro collinear laser is constructed from a plurality of position information.
9. The method of claim 8, wherein adjusting the positions of the laser crystal, the shaping module, and the amplifying crystal in a direction parallel to a propagation direction of the beam, and obtaining the energy values of the amplified laser output by the plurality of sets of amplifying crystals comprises:
determining a maximum value L1 and a minimum value L2 of the distance between the laser crystal and the amplifying crystal according to the parameters of the micro collinear laser;
and according to the maximum value L1 and the minimum value L2, taking s as a reference, obtaining 2n+1 groups of relative distance parameters:
under 2n+1 sets of relative distance parameters, adjusting the position of the shaping module along a direction parallel to the propagation direction of the light beam;
acquiring a plurality of groups of energy values of amplified lasers output by the amplifying crystals;
where s is the minimum precision of the distance adjustment, n=0, 1,2, … … N, N is a positive integer.
10. The method of claim 8, further comprising a focusing module positioned between the pump light source and the laser crystal;
before the step of acquiring the position information of the pumping light source, the method further comprises the following steps:
adjusting the position of the focusing module along a direction perpendicular to the propagation direction of the light beam;
determining the position information of the focusing module when the light spot on the incidence surface of the laser crystal is concentric with the incidence surface, and marking the position information as first focusing position information;
adjusting the position of the focusing module along the direction parallel to the propagation direction of the light beam to obtain the spot sizes of a plurality of groups of incidence surfaces of the laser crystals;
and when the spot size of the incidence surface of the laser crystal is determined to be minimum, the position information of the focusing module is marked as second focusing position information.
CN202310500088.2A 2023-05-05 2023-05-05 Miniature collinear laser and design method thereof Pending CN116544764A (en)

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