CN115173205A - Pumping system and pumping system adjusting method - Google Patents
Pumping system and pumping system adjusting method Download PDFInfo
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- CN115173205A CN115173205A CN202211092311.6A CN202211092311A CN115173205A CN 115173205 A CN115173205 A CN 115173205A CN 202211092311 A CN202211092311 A CN 202211092311A CN 115173205 A CN115173205 A CN 115173205A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/0941—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a laser diode
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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
- H01S3/094076—Pulsed or modulated pumping
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Abstract
The invention relates to the technical field of lasers, in particular to a pumping system and a pumping system adjusting method. The pumping system provided by the invention comprises a pumping source, a light distribution element and a laser crystal which are sequentially arranged along a light path; the pump source emits pump light, and the pump light comprises P light and S light with orthogonal polarization directions; the proportion of P light and S light can be adjusted by the light distribution element, so that the proportion of P light and S light in pump light entering the laser crystal can be adjusted by adjusting the light distribution element aiming at different types of laser crystals, the laser crystal can reach the maximum absorption efficiency, the maximum output power can be reached when the pump system uses different laser crystals, and the beam quality of output laser is improved.
Description
Technical Field
The invention relates to the technical field of lasers, in particular to a pumping system and a pumping system adjusting method.
Background
Semiconductor lasers, also known as laser diodes, are lasers that use semiconductor materials as the working substance. The semiconductor laser has small volume and long service life, and can be pumped by adopting a simple current injection mode, so that the semiconductor laser is widely applied to the aspects of laser communication, optical storage, optical gyros, laser printing, distance measurement, radar and the like.
In the existing semiconductor laser, pump light emitted by a pump source is light with a single polarization direction, the polarization degree is generally about 90%, and the proportion of P light and S light is fixed, however, different laser crystals have different absorption efficiencies for P light and S light in the pump light, so that the problem that part of laser crystals cannot reach the maximum absorption efficiency exists, and further, the laser intensity of the whole pump system does not reach the maximum value, and the laser power and the beam quality are affected.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the proportion of P light and S light in the pumping light emitted by the pumping source of the existing pumping system is fixed, so that the maximum absorption efficiency of all laser crystals to the pumping light cannot be met.
(II) technical scheme
In order to solve the above technical problem, an embodiment of an aspect of the present invention provides a pumping system, including: the pump source, the light distribution element and the laser crystal are sequentially arranged along the light path;
the pump source emits pump light, the pump light is linearly polarized light, the pump light comprises P light and S light, polarization directions of the P light and the S light are orthogonal, and the light distribution element is used for adjusting the proportion of the P light and the S light entering the laser crystal.
According to one embodiment of the invention, the light distribution element comprises a half-wave plate which can rotate around the axis of the half-wave plate and is used for adjusting the polarization direction of the pump light; the axis of the half-wave plate is parallel to the propagation direction of the pump light.
According to an embodiment of the invention, the pumping system further comprises a fast axis collimator mirror disposed between the pump source and the half-wave plate.
According to an embodiment of the present invention, the pumping system further includes a fast axis compression mirror and a slow axis compression mirror, and the fast axis compression mirror and the slow axis compression mirror are sequentially disposed between the fast axis collimating mirror and the half-wave plate along a propagation direction of the optical path.
According to an embodiment of the invention, the pumping system further comprises a polarization beam splitter, a first mirror, a second mirror, and a polarization beam combiner;
the polarization beam splitter is arranged at the rear end of the half-wave plate, and the polarization beam combiner is positioned at the rear end of the polarization beam splitter;
the polarization beam splitter is used for splitting one beam of the pump light into P light and S light; the S light is reflected into the polarization beam combiner through the first reflecting mirror and the second reflecting mirror in sequence, and the P light is emitted into the polarization beam combiner;
the polarization beam combiner is used for combining the P light and the S light into a beam.
According to an embodiment of the invention, the pumping system further comprises a dichroic mirror, which is arranged between the laser crystal and the half-wave plate.
According to an embodiment of the invention, the pumping system further comprises a power meter, the power meter is arranged at the rear end of the laser crystal.
According to one embodiment of the invention, the pump source comprises a base, a first laser chip and a second laser chip, wherein the first laser chip is used for emitting P light, and the second laser chip is used for emitting S light;
the pumping source comprises the first laser chip and the second laser chip, and the first laser chip and the second laser chip are arranged on the base; or the like, or, alternatively,
the pumping source comprises a plurality of first laser chips and a plurality of second laser chips; the plurality of first laser chips are sequentially stacked on the base to form a first bar, the plurality of second laser chips are sequentially stacked on the base to form a second bar, and a heat sink is arranged between the first bar and the second bar; or
The pumping source comprises a plurality of first laser chips and a plurality of second laser chips, and the first laser chips and the second laser chips are sequentially and alternately arranged on the base.
Another embodiment of the present invention further provides a method for adjusting a pumping system, including:
a pump source emits pump light, and the pump light comprises P light and S light with orthogonal polarization directions;
and adjusting the polarization direction of the pump light by adjusting the light distribution element so as to adjust the proportion of the P light and the S light entering the laser crystal.
According to one embodiment of the invention, the light distribution element comprises a half-wave plate; and rotating the half-wave plate, adjusting the polarization direction of the pump light, arranging a power meter at the rear end of the laser crystal, and observing the reading on the power meter when rotating the half-wave plate until the laser intensity emitted by the laser crystal reaches the maximum.
According to one embodiment of the invention, a polarization beam splitter and a polarization beam combiner are arranged between the half-wave plate and the laser crystal;
the polarization beam splitter divides one beam of the pump light into P light and S light, the P light is transmitted into the polarization beam combiner, and the S light respectively enters the polarization beam combiner through a first reflector and a second reflector;
when the intensity of the laser entering the laser crystal reaches the maximum value, measuring the intensity of the P light on the light path of the P light between the polarization beam splitter and the polarization beam combiner through the power meter; measuring the intensity of the S light by the power meter on the light path of the S light between the polarization beam splitter and the polarization beam combiner; so as to obtain the proportion of the P light and the S light when the laser intensity of the corresponding laser crystal is maximum.
The invention has the beneficial effects that: the pumping system provided by the invention comprises a pumping source, a light distribution element and a laser crystal which are sequentially arranged along a light path; the pump source emits pump light, the pump light is polarized light, and the pump light comprises P light and S light which are orthogonal in polarization direction; the proportion of P light and S light can be adjusted by the light distribution element, so that the proportion of P light and S light in pump light entering the laser crystal can be adjusted by adjusting the light distribution element aiming at different types of laser crystals, the laser crystal can reach the maximum absorption efficiency, the maximum output power can be reached when the pump system uses different laser crystals, and the beam quality of output laser is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic diagram of a pumping system provided in accordance with an embodiment of the present invention;
FIG. 2 is a schematic diagram of a pumping system provided in accordance with another embodiment of the present invention;
FIG. 3 is a schematic diagram of a pump source according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a pump source according to another embodiment of the present invention;
fig. 5 is a schematic diagram of a pump source according to another embodiment of the present invention.
Reference numerals are as follows: 1-a pump source; 11-a base; 111-a first bar; 1111-a first laser chip; 112-a second bar; 1121-second laser chip; 113-a heat sink; 114-fast axis collimating mirror; 115-solder;
2-fast axis compression lens; 3-a slow axis compression mirror; 4-a half-wave plate; 5-a polarizing beam splitter; 6-a polarization beam combiner; 7-a first mirror; 8-a second mirror; 9-dichroic mirror; 10-laser crystal; 101-power meter.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, the present invention will be described in further detail below with reference to the accompanying drawings and detailed description, and the embodiments and features of the embodiments of the present application may be combined with each other without conflict. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
As shown in fig. 1 and fig. 2, an embodiment of an aspect of the present invention provides a pumping system, including: the pumping source 1, the light distribution element and the laser crystal 10 are arranged along the optical path in sequence; the pump source 1 emits pump light, the pump light is linearly polarized light, the pump light includes P light and S light with orthogonal polarization directions, and the light distribution element is used for adjusting the proportion of the P light and the S light entering the laser crystal 10.
The pumping system provided by the embodiment comprises a pumping source 1, a light distribution element and a laser crystal 10 which are sequentially arranged along an optical path; the pump source 1 emits pump light, and the pump light comprises P light and S light with orthogonal polarization directions; the light distribution element can adjust the proportion of the P light and the S light, so that the proportion of the P light and the S light in the pump light entering the laser crystal 10 can be adjusted by adjusting the light distribution element aiming at different types of laser crystals 10, the laser crystal 10 can achieve the maximum absorption efficiency, the maximum output power can be achieved when different laser crystals 10 are used in a pumping system, and the beam quality of the output laser is improved.
According to one embodiment of the present invention, as shown in fig. 1 and fig. 2, the light distribution element includes a half-wave plate 4, the half-wave plate 4 is a birefringent crystal having a thickness, when the normally incident light is transmitted, the phase difference between the ordinary light (o light) and the extraordinary light (e light) is equal to pi or an odd multiple thereof, such a wafer is called a half-wave plate, which is referred to as the half-wave plate 4; the half-wave plate 4 can rotate around the axis thereof for adjusting the polarization direction of the pump light, as shown in fig. 1 and 2, the axis of the half-wave plate 4 is parallel to the propagation direction of the pump light; the polarization direction of the pump light passing through the half-wave plate 4 can be adjusted by the half-wave plate 4, so that the polarization direction of the pump light can be adjusted by rotating the half-wave plate 4, the proportion of the P light and the S light entering the laser crystal 10 is adjusted, the corresponding maximum absorption efficiency of the laser crystal 10 can be met, and the laser output power and the laser beam quality are improved.
Alternatively, in this embodiment, the light distribution element may also be an optical rotation sheet and a faraday rotator, and the polarization direction of the pump light can be adjusted through the optical rotation sheet and the faraday rotator, so as to adjust the ratio of P light and S light in the pump light.
As shown in fig. 1 and fig. 2, in this embodiment, the pumping system further includes a fast axis collimator 114, and the fast axis collimator 114 is disposed between the pumping source 1 and the half-wave plate 4. Optionally, as shown in fig. 1, the fast axis collimator 114 is placed at the rear end of the pump source 1, that is, the fast axis collimator 114 is placed at the light emitting end of the pump source 1, the fast axis collimator 114 (FAC) is adjusted by an adjusting bracket, and then is fixed on the base 11 by using glue, and optionally, the fast axis collimator 114 may be fixed on the base 11 by using ultraviolet glue; wherein the fast axis collimating mirror 114 is used to collimate the pump light emitted by the pump source 1.
As shown in fig. 1 and fig. 2, the pumping system further includes a fast axis compression mirror 2 and a slow axis compression mirror 3, and the fast axis compression mirror 2 and the slow axis compression mirror 3 are sequentially disposed between the fast axis collimating mirror 114 and the half-wave plate 4 along the propagation direction of the optical path; in this embodiment, the fast axis compression mirror 2 and the slow axis compression mirror 3 are used to compress the light spot emitted from the pump source 1 to a size that can be introduced into the laser crystal 10.
As shown in fig. 1 and 2, in an embodiment of the present invention, the pumping system further includes a dichroic mirror 9, and the dichroic mirror 9 is disposed between the laser crystal 10 and the half-wave plate 4; the dichroic mirror 9, also called a wavelength filter, functions to transmit a part of the wavelength of light and return another part of the wavelength of light, and in this embodiment, the dichroic mirror 9 is disposed at the front end of the laser crystal 10, and is used to pump the appropriate wavelength of light into the laser crystal 10. In this embodiment, seed light may also be introduced into the dichroic mirror 9, and laser generated by the laser crystal 10 is either generated by its own resonant cavity or amplified by seed laser; optionally, in this embodiment, the dichroic mirror 9 is disposed below the laser crystal 10, and the seed light enters from a position below the laser crystal 10, but in this embodiment, the dichroic mirror 9 may also be disposed at another position of the laser crystal 10, and the placement position of the dichroic mirror 9 is set based on the placement angle of the dichroic mirror 9.
As shown in fig. 1 and fig. 2, the pumping system further includes a power meter 101, where the power meter 101 is disposed at the rear end of the laser crystal 10; in this embodiment, when adjusting the half-wave plate 4, the power meter 101 may display the power corresponding to the half-wave plate 4 rotating at different angles, and when the power displayed by the power meter 101 is the maximum, the half-wave plate 4 stops rotating at this time, the laser crystal 10 may maximize the pump light absorption efficiency, and the laser crystal 10 may reach the maximum output light intensity, and the light beam effect is better. According to the polarization absorption characteristic of the laser crystal 10, the power peak is observed while rotating the half-wave plate 4, and when the power on the power meter 101 reaches the peak, it indicates that the absorption efficiency of the laser crystal 10 to the pump light of the pump reaches the optimal value. The power meter 101 is set only when the polarization direction of the pump light is adjusted, and the power meter 101 needs to be removed after the adjustment is completed, so that the power meter 101 is prevented from blocking the light path.
According to another embodiment of the present invention, as shown in fig. 2, the pumping system further comprises a polarization beam splitter 5, a first mirror 7, a second mirror 8, and a polarization beam combiner 6; the polarization beam splitter 5 is arranged at the rear end of the half-wave plate 4, and the polarization beam combiner 6 is arranged at the rear end of the polarization beam splitter 5; the polarization beam splitter 5 is configured to split one beam of the pump light into P light and S light; the S light is reflected into the polarization beam combiner 6 through a first reflecting mirror 7 and a second reflecting mirror 8 in sequence, and the P light is directly emitted into the polarization beam combiner 6; the polarization beam combiner 6 is used for combining the P light and the S light into a beam. In this embodiment, a polarization beam combiner 6 and a polarization beam splitter 5 are further disposed between the half-wave plate 4 and the laser crystal 10, where the polarization beam splitter 5 is configured to split the incoming pump light into P light and S light with orthogonal polarization directions; the P light can be directly transmitted to the polarization beam combiner 6 at the rear end, and the S light can enter the polarization beam combiner 6 only by passing through the first reflecting mirror 7 and the second reflecting mirror 8, and the P light and the S light entering the polarization beam combiner 6 are combined into a beam of pump light. When the power meter 101 at the rear end of the laser crystal 10 reaches a maximum value, the absorption efficiency of the laser crystal 10 for the pump light is highest at this time.
In this embodiment, the worker may set the power meter 101 on the optical path of the P light and the optical path of the S light between the polarization beam combiner 6 and the polarization beam splitter 5, and may take the power meter 101 at the rear end of the laser crystal 10 to be placed on the optical path of the P light or the optical path of the S light, or take a new power meter 101 again; the ratio of P light to S light in the pump light, the rotation angle of the corresponding half-wave plate 4, the polarization direction of the pump light and the like can be read by the power meter 101 when the absorption efficiency of the laser crystal 10 is maximum, and then recorded, and the half-wave plate 4 is directly adjusted to the corresponding rotation angle in the subsequent pump system of the laser crystal 10, so that the polarization direction of the pump light reaches the recorded numerical value, and the power meter 101 does not need to be arranged at the rear end for detection, and the difficulty in the subsequent pump system arrangement can be simplified. Meanwhile, the ratio of P light to S light in the pump light can be directly adjusted to the above value in the pump source 1, and the maximum absorption efficiency of the laser crystal 10 to the pump light can be realized without adjustment subsequently.
As shown in fig. 3 and 4, the pump source 1 includes a base 11, a first laser chip 1111 and a second laser chip 1121, wherein the first laser chip 1111 is used for emitting P light, the second laser chip 1121 is used for emitting S light, and both the first laser chip 1111 and the second laser chip 1121 are disposed on the base 11.
As shown in fig. 3 and 4, the pump source 1 includes a plurality of the first laser chips 1111 and a plurality of the second laser chips 1121, the plurality of the first laser chips 1111 are sequentially stacked to form a first bar 111, the plurality of the second laser chips 1121 are sequentially stacked to form a second bar 112, and a heat sink 113 is disposed between the first bar 111 and the second bar 112. The edge of the first bar 111 is provided with solder 115, and the first bar 111 is welded on the base 11 through the solder 115; the edge of the second bar 112 is provided with solder 115, and the second bar 112 is soldered on the base 11 by the solder 115. Preferably, as shown in fig. 3 and 4, a plurality of first bars 111 and a plurality of second bars 112 are disposed on the base, the plurality of first bars 111 and the plurality of second bars 112 are sequentially and alternately disposed, a heat sink 113 is disposed between any adjacent first bars 111 and second bars 112, the first bars 111 and second bars 112 emit light with different polarization directions, wherein the first laser chip 1111 on the first bar 111 emits P light, the second laser chip 1121 on the second bar 112 emits S light, and then the stacked bar technology in which the first bars 111 and the second bars 112 are sequentially overlapped is packaged into a semiconductor laser device outputting circularly polarized light.
According to another embodiment of the present invention, as shown in fig. 5, a plurality of the first bars 111 and a plurality of the second bars 112 are alternately arranged in sequence to form a chip module; at least two chip modules are arranged on the base 11, and a heat sink 113 is arranged between the two chip modules; in this embodiment, the output power of the semiconductor laser can be increased by providing a plurality of chip modules, as shown in fig. 5, in this embodiment, two chip modules are provided on the base 11, one chip module may include two first bars 111 and two second bars 112, the two first bars 111 and the two second bars 112 are alternately provided to form the chip module, and the outer side of each chip module is soldered on the base 11 through a solder 115. It should be noted that, in this embodiment, the number of each chip module including the first bar 111 and the second bar 112 is not limited to two, and may also be three, four, five or even more, and the number of each chip module that each pump source 1 may include is not limited to two, and may also be three, four or the like.
In the above embodiment of the present invention, the pump source 1 may also be a single-tube structure, for example, the pump source 1 includes a plurality of independent first laser chips 1111 and a plurality of independent second laser chips 1121, and the plurality of first laser chips 1111 and the plurality of second laser chips 1121 are alternately arranged in sequence, which can also achieve the purpose that the pump light emitted by the pump source 1 of the present invention is linearly polarized light and the pump light includes P light and S light with orthogonal polarization directions, without departing from the design concept of the present invention, and the present invention shall fall within the protection scope of the present invention.
The working principle of the pumping system provided by the embodiment of the invention is described below with reference to fig. 2:
the pumping system comprises a pumping source 1, a fast axis collimating mirror 114, a fast axis compression mirror 2, a slow axis compression mirror 3, a half-wave plate 4, a polarization beam splitter 5, a polarization beam combiner 6, a dichroic mirror 9 and a laser crystal 10 which are sequentially arranged along a light path; the pump source 1 emits pump light, and the pump light includes P light and S light with orthogonal polarization directions.
The first laser chip 1111 in the first bar 111 emits P light, the second laser chip 1121 in the second bar 112 emits S light, the pump light is collimated by the fast axis collimating mirror 114, then the P light and the S light are compressed into a beam of light by the fast axis compression mirror 2 and the slow axis compression mirror 3, and the size of the light spot is compressed to a size that can be guided into the laser crystal 10; for isotropic laser crystals 10 such as Nd: YAG, cr: YAG, which can absorb pump light with different polarization directions, and the adoption of the circularly polarized pump source 1 can improve the absorption efficiency of the laser crystal 10.
The pump light compressed into a beam of light enters the half-wave plate 4, the polarization direction of the pump light can be adjusted by rotating the half-wave plate 4, the proportion of P light and S light in the pump light is further adjusted, then the output power of the laser crystal 10 is measured by the power meter 101 at the rear end of the laser crystal 10, when the output power of the laser crystal 10 measured by the power meter 101 reaches the maximum value, the rotation of the half-wave plate 4 is stopped, and at the moment, the absorption efficiency of the laser crystal 10 on the pump light reaches the maximum value.
The pump light with the polarization direction adjusted by the half-wave plate 4 enters the polarization beam splitter 5, and is decomposed into P light and S light with orthogonal polarization directions by the polarization beam splitter 5, the P light directly enters the polarization beam combiner 6, and the S light is reflected into the polarization beam combiner 6 by the first reflecting mirror 7 and the second reflecting mirror 8; the polarization beam combiner 6 combines the split P light and S light. Then, a power meter 101 is arranged on the light path of the P light between the polarization beam splitter 5 and the polarization beam combiner 6, and the intensity of the P light is measured; and a power meter 101 is arranged on the optical path of the S light between the polarization beam splitter 5 and the polarization beam combiner 6, and the intensity of the S light is measured, so that the proportion of the P light to the S light when the absorption efficiency of the laser crystal 10 to the pump light is maximum can be obtained.
The light from the polarization beam combiner 6 enters into the dichroic mirror 9, the dichroic mirror 9 transmits the light with the proper wavelength into the laser crystal 10 through the pump, and meanwhile, the dichroic mirror 9 can also emit the seed light. The laser generated by the laser crystal 10 is generated by a self resonant cavity or amplified by seed laser.
Wherein the power of the pump light provided by the invention can reach kilowatt level, such as 1-20kw.
The invention also provides a method for adjusting the pumping system, which comprises the following steps: the method comprises the steps that a pumping source 1 emits orthogonal pumping light which comprises P light and S light with orthogonal polarization directions; by adjusting the light distribution element, the polarization direction of the pump light is adjusted to adjust the ratio of the P light and the S light entering the laser crystal 10.
In this embodiment, the ratio of P light to S light in the pump light entering the laser crystal 10 can be adjusted by the light distribution element, and different laser crystals 10 have different absorption efficiencies for linearly polarized light with different ratios of P light to S light, so that the absorption efficiency of the laser crystal 10 can be adjusted by adjusting the light distribution element, and the intensity of the output laser light can be adjusted.
Optionally, in this embodiment, the light distribution element includes a half-wave plate 4; the method comprises the following steps of rotating a half-wave plate 4, adjusting the polarization direction of pump light, arranging a power meter 101 at the rear end of a laser crystal 10, observing the reading on the power meter 101 when the half-wave plate 4 is rotated until the laser intensity emitted by the laser crystal 10 reaches the maximum, indicating that the laser crystal 10 of the type can achieve the maximum absorption efficiency on the pump light at the moment, further enabling the light intensity of the output laser to reach the maximum, and improving the quality of laser beams.
Preferably, in the above embodiment of the present application, a polarization beam splitter 5 and a polarization beam combiner 6 are disposed between the half-wave plate 4 and the laser crystal 10; the polarization beam splitter 5 splits a beam of pump light into P light and S light, the P light is transmitted into the polarization beam combiner 6, and the S light respectively enters the polarization beam combiner 6 through a first reflector 7 and a second reflector 8; when the intensity of the laser light entering the laser crystal 10 reaches the maximum value, the intensity of the P light is measured by the power meter 101 on the light path of the P light between the polarization beam splitter 5 and the polarization beam combiner 6; measuring the intensity of the S light by a power meter 101 on the optical path of the S light between the polarization beam splitter 5 and the polarization beam combiner 6; so as to obtain the proportion of the P light and the S light when the laser intensity of the corresponding laser crystal 10 is maximum; in a subsequent pumping system using the laser crystal 10, the ratio of P light to S light in the pumping light can be directly adjusted to the ratio of the maximum pumping light absorption efficiency of the laser crystal 10, and the measurement by the power meter 101 is not needed, so that the use is more convenient.
In the description of the present invention, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the communication may be direct, indirect via an intermediate medium, or internal to both elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, which is intended to cover any modifications, equivalents, improvements, etc. within the spirit and scope of the present invention.
Claims (11)
1. A pumping system, comprising: the pumping source (1), the light distribution element and the laser crystal (10) are arranged along the optical path in sequence;
the laser crystal (10) comprises a laser crystal (1) and a light distribution element, wherein the laser crystal (10) is used for emitting pump light, the pump light is linearly polarized light and comprises P light and S light, the polarization directions of the P light and the S light are orthogonal, and the light distribution element is used for adjusting the proportion of the P light and the S light entering the laser crystal (10).
2. A pumping system according to claim 1, wherein the light distribution element comprises a half-wave plate (4), the half-wave plate (4) being rotatable about its axis for adjusting the polarization direction of the pump light; the axis of the half-wave plate (4) is parallel to the propagation direction of the pump light.
3. The pumping system of claim 2, further comprising a fast axis collimator (114), the fast axis collimator (114) being arranged between the pump source (1) and the half-wave plate (4).
4. A pumping system according to claim 3, further comprising a fast axis compression mirror (2) and a slow axis compression mirror (3), the fast axis compression mirror (2) and the slow axis compression mirror (3) being arranged in sequence between the fast axis collimating mirror (114) and the half-wave plate (4) along a propagation direction of the optical path.
5. The pumping system according to any of claims 2 to 4, further comprising a polarizing beam splitter (5), a first mirror (7), a second mirror (8) and a polarizing beam combiner (6);
the polarization beam splitter (5) is arranged at the rear end of the half-wave plate (4), and the polarization beam combiner (6) is arranged at the rear end of the polarization beam splitter (5);
the polarization beam splitter (5) is used for splitting one beam of the pump light into P light and S light; s light is reflected into the polarization beam combiner (6) through a first reflector (7) and a second reflector (8) in sequence, and P light is incident into the polarization beam combiner (6);
the polarization beam combiner (6) is used for combining the P light and the S light into a beam of light.
6. The pumping system of claim 2, further comprising a dichroic mirror (9), the dichroic mirror (9) being arranged between the laser crystal (10) and the half-wave plate (4).
7. Pump system according to any of claims 1 to 4, characterized in that it further comprises a power meter (101), said power meter (101) being provided at the rear end of said laser crystal (10).
8. The pumping system of any of claims 1 to 4, wherein the pump source (1) comprises a base (11), a first laser chip (1111) and a second laser chip (1121), the first laser chip (1111) being configured to emit P light, the second laser chip (1121) being configured to emit S light;
the pumping source (1) comprises a first laser chip (1111) and a second laser chip (1121), and the first laser chip (1111) and the second laser chip (1121) are arranged on the base (11); or the like, or a combination thereof,
the pump source (1) comprises a plurality of the first laser chips (1111) and a plurality of the second laser chips (1121); the plurality of first laser chips (1111) are sequentially stacked on the base (11) to form a first bar (111), the plurality of second laser chips (1121) are sequentially stacked on the base (11) to form a second bar (112), and a heat sink (113) is arranged between the first bar (111) and the second bar (112); or the like, or, alternatively,
the pumping source comprises a plurality of first laser chips (1111) and a plurality of second laser chips (1121), and the first laser chips (1111) and the second laser chips (1121) are alternately arranged on the base (11) in sequence.
9. A method of regulating a pumping system, comprising:
the method comprises the steps that a pump source (1) emits pump light, wherein the pump light comprises P light and S light with orthogonal polarization directions;
the polarization direction of the pump light is adjusted by adjusting the light distribution element so as to adjust the proportion of the P light and the S light entering the laser crystal (10).
10. Pump system adjustment method according to claim 9,
the light distribution element comprises a half-wave plate (4); rotating the half-wave plate (4), adjusting the polarization direction of the pump light, arranging a power meter (101) at the rear end of the laser crystal (10), and observing the reading on the power meter (101) when rotating the half-wave plate (4) until the intensity of the laser emitted by the laser crystal (10) reaches the maximum.
11. A pump system adjustment method according to claim 10, characterized in that a polarization beam splitter (5) and a polarization beam combiner (6) are arranged between the half-wave plate (4) and the laser crystal (10);
the polarization beam splitter (5) splits one beam of the pump light into P light and S light, the P light is transmitted into the polarization beam combiner (6), and the S light respectively enters the polarization beam combiner (6) through a first reflector (7) and a second reflector (8);
when the intensity of the laser entering the laser crystal (10) reaches the maximum value, measuring the intensity of P light on the light path of the P light between the polarization beam splitter (5) and the polarization beam combiner (6) through the power meter (101); measuring the intensity of the S light by the power meter (101) on the optical path of the S light between the polarization beam splitter (5) and the polarization beam combiner (6); so as to obtain the proportion of P light and S light when the laser intensity of the corresponding laser crystal (10) is maximum.
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