CN108988117B - Laser amplifier based on polarization synthesis laser gain - Google Patents
Laser amplifier based on polarization synthesis laser gain Download PDFInfo
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- CN108988117B CN108988117B CN201810830987.8A CN201810830987A CN108988117B CN 108988117 B CN108988117 B CN 108988117B CN 201810830987 A CN201810830987 A CN 201810830987A CN 108988117 B CN108988117 B CN 108988117B
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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
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/10061—Polarization control
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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
- H01S3/10—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
- H01S3/10023—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers by functional association of additional optical elements, e.g. filters, gratings, reflectors
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Abstract
The invention discloses a laser amplifier based on polarization synthesis laser gain, which comprises: the device comprises a pumping source, a focusing coupling mirror group, a total reflection mirror, a polarized laser medium, a half-wave plate, a 45-degree Faraday rotator and a polaroid, wherein: the pump source, the focusing coupling mirror group, the total reflection mirror, the polarized laser medium, the half-wave plate, the 45-degree Faraday rotator and the polaroid are sequentially and coaxially arranged; the polarized laser medium and the half-wave plate form a polarized composite gain control functional module, and the composite laser gain of the laser amplifier is controlled by rotating the half-wave plate. The scheme of the invention can realize gain control of the amplifier under the condition of certain injection energy of the amplifier, namely on the premise of no change of the heat effect of the laser system, thereby achieving the technical effect of changing the output energy of the amplifier.
Description
Technical Field
The invention relates to the technical field of lasers, in particular to a laser amplifier based on polarization synthesis laser gain.
Background
In many application scenarios, a high quality laser beam, i.e. a single transverse mode and a single longitudinal mode laser beam, is required, but a laser operating in a single mode generally has a limited output power or energy due to its large cavity loss and small mode volume. In order to increase power or energy, a laser amplifier is used.
A laser amplifier is a device that amplifies energy (power) of light using stimulated radiation of light. By using a laser amplifier, the quality of the laser (including pulse width, line width, polarization characteristics, etc.) can be maintained while obtaining higher laser energy or power.
Currently, the output power of a laser amplifier is mainly adjusted by changing the pump power, but the method causes the change of the thermal lens effect in a laser system, and further causes the change of the laser output energy and the beam quality. Therefore, in the mature laser system, the energy or power of the final output laser is changed by controlling the energy of the seed laser, and in the system, the laser amplifier is realized based on the fixed pumping power. However, the mode of the laser amplifier for determining the pumping power has some problems due to the change of the energy of the seed laser: the seed laser has high cost in the whole laser system, and in order to realize the energy variability of the laser system, a polarization device needs to be inserted into the seed laser output end to control the energy of the laser amplifier at the incident end, so that the waste of the seed laser output parameters on resources is caused.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a laser amplifier based on polarization synthesis laser gain.
The invention provides a laser amplifier based on polarization synthesis laser gain, which comprises: the device comprises a pumping source 1, a focusing coupling mirror group 2, a total reflection mirror 3, a polarized laser medium 4, a half-wave plate 5, a 45-degree Faraday rotator 6 and a polaroid 7, wherein:
the pump source 1, the focusing coupling mirror group 2, the total reflection mirror 3, the polarized laser medium 4, the half-wave plate 5, the 45-degree Faraday rotator 6 and the polaroid 7 are sequentially and coaxially arranged optically;
the pump light generated by the pump source 1 is firstly converged by the focusing coupling mirror group 2, then passes through the total reflection mirror 3, and finally is absorbed by the polarized laser medium 4, so that the polarized laser medium particles jump to the upper laser energy level to form population inversion;
the seed laser is input into the polaroid 7 along the reverse direction of the pump light to form linearly polarized light, the linearly polarized light sequentially enters the 45-degree Faraday rotator 6, the half-wave plate 5 and the polarized laser medium 4, the linearly polarized light is amplified after passing through the polarized laser medium 4 with the particle number reversed, and under the action of the total reflection mirror 3, the amplified linearly polarized light sequentially passes through the polarized laser medium 4, the half-wave plate 5 and the 45-degree Faraday rotator 6 and is finally reflected and output by the polaroid 7.
Optionally, the polarized laser medium 4 and the half-wave plate 5 constitute a polarized composite gain control function module, and the composite laser gain of the laser amplifier is controlled by rotating the half-wave plate 5.
Optionally, the pump source 1 is a direct output semiconductor laser, and the wavelength corresponds to the absorption peak of the polarized laser medium 4;
the focusing coupling mirror group 2 is composed of two cylindrical mirrors and a convex lens, wherein the cylindrical mirrors are orthogonally arranged, one surface of each cylindrical mirror is a plane, the other surface of each cylindrical mirror is a convex surface, and the planes of the cylindrical mirrors are opposite to the pumping source 1.
Optionally, the pump source 1 is a fiber-coupled semiconductor laser, and the wavelength corresponds to the absorption peak of the polarized laser medium 4;
the focusing coupling lens group 2 is composed of two plano-convex lenses, and the convex surfaces are opposite.
Optionally, the total reflection mirror 3 is one of a plane mirror, a concave mirror and a convex mirror, and a side facing the polarized laser medium 4 is plated with a laser high reflection film.
Optionally, when the thermal effect of the polarized laser medium 4 is smaller than a first preset threshold, the total reflection mirror 3 is a plane mirror; when the thermal effect of the polarized laser medium 4 is greater than a second preset threshold, the total reflection mirror 3 is a concave mirror or a convex mirror, and the concave surface or the convex surface of the total reflection mirror faces the polarized laser medium 4.
Optionally, the polarized laser medium 4 is a laser medium with polarization property and has a crystal optical axis.
Optionally, the half-wave plate 5 is a polarizer and made of a uniaxial crystal, the light-passing surface is parallel to the optical axis of the polarized laser medium 4, and the light-passing direction is perpendicular to the optical axis of the polarized laser medium 4.
Optionally, the 45 degree faraday rotator 6 is a rotator utilizing the faraday magneto-optical effect.
Optionally, the surface of the polarizer 7 is plated with a P-light high-transmittance film and an S-light high-reflectance film, and is placed at brewster angle or 45 degrees with respect to the optical axis.
The laser amplifier based on the polarization synthesis laser gain controls the gain of the laser amplifier through the rotation of the half-wave plate, and changes the output energy of the amplifier, thereby realizing the technical effect of the gain of the amplifier under the condition that the injection energy of the amplifier is certain, namely the thermal effect of a laser system is not changed. Compared with the prior art, the technical scheme of the invention can increase the control precision of the laser system on the output energy, and the waste of the seed laser energy is avoided because the laser system can be independently used at one end of the amplifier.
Drawings
Fig. 1 is a schematic structural diagram of a laser amplifier based on polarization-combined laser gain according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to specific embodiments and the accompanying drawings.
Fig. 1 is a schematic structural diagram of a laser amplifier based on polarization-combined laser gain according to an embodiment of the present invention, as shown in fig. 1, the laser amplifier includes a pump source 1, a focusing coupling mirror group 2, an all-reflecting mirror 3, a polarized laser medium 4, a half-wave plate 5, a 45-degree faraday rotator 6, and a polarizer 7, wherein:
the pump source 1, the focusing coupling mirror group 2, the total reflection mirror 3, the polarized laser medium 4, the half-wave plate 5, the 45-degree Faraday rotator 6 and the polaroid 7 are sequentially and coaxially arranged optically;
the pump light generated by the pump source 1 is firstly converged by the focusing coupling mirror group 2, then passes through the total reflection mirror 3, and finally is absorbed by the polarized laser medium 4, so that the polarized laser medium particles jump to the upper laser energy level to form population inversion;
the seed laser is input into the polaroid 7 along the reverse direction of the pump light to form linearly polarized light, the linearly polarized light sequentially enters the 45-degree Faraday rotator 6, the half-wave plate 5 and the polarized laser medium 4, the linearly polarized light is amplified after passing through the polarized laser medium 4 with the particle number reversed, and under the action of the total reflection mirror 3, the amplified linearly polarized light sequentially passes through the polarized laser medium 4, the half-wave plate 5 and the 45-degree Faraday rotator 6 and is finally reflected and output by the polaroid 7.
The polarized laser medium 4 and the half-wave plate 5 constitute a polarized composite gain control function module, after linearly polarized light passes through the half-wave plate 5 for the first time, the linearly polarized light is projected according to the optical axis direction of the half-wave plate 5 and is decomposed into linearly polarized light in two vertical directions, the polarized laser medium 4 has polarization characteristics, stimulated emission cross sections in the two polarization directions are different, based on the fact that small signal gain is equal to the product of the stimulated emission cross section and doped particles in the unit volume of the polarized laser medium 4, the polarized laser medium 4 has different gains for the linearly polarized light in the two directions, and the proportion of the linearly polarized light in the two directions can be changed by rotating the half-wave plate 5, so that the effect of controlling the gain of the composite laser.
In an embodiment of the present invention, the pump source 1 is a directly output semiconductor laser, and the output pump light is decomposed into two directions of pump light from a beam cross section, and the wavelength corresponds to the absorption peak of the polarized laser medium 4; the focusing coupling lens group 2 consists of two cylindrical lenses and a convex lens which are orthogonally arranged, in order to reduce spherical aberration brought by the cylindrical lenses, one surface of each cylindrical lens is a plane, the other surface of each cylindrical lens is a convex surface, and the plane of each cylindrical lens is opposite to the pumping source 1; the two cylindrical mirrors in the focusing coupling mirror group 2 shape the pump light in two directions decomposed by the pump source 1 into approximately parallel light beams, and the convex lenses in the focusing coupling mirror group 2 focus the approximately parallel light beams.
In another embodiment of the present invention, the pump source 1 is a semiconductor laser coupled to output by an optical fiber, the wavelength corresponds to the absorption peak of the polarized laser medium 4, and since the optical fiber has a homogenization effect, the divergence angles in any direction on the cross section of the pump beam output by the pump source 1 are the same; the focusing coupling mirror group 2 is composed of two plano-convex lenses, the convex surfaces of the plano-convex lenses are opposite, the convex mirror close to the pumping source 1 converts the light beam output by the pumping source 1 into parallel light, and the convex mirror far away from the pumping source 1 focuses the parallel light.
In an embodiment of the present invention, the total reflection mirror 3 may be a plane mirror, a concave mirror, or a convex mirror, when the thermal effect of the polarized laser medium 4 is very small, for example, smaller than a first preset threshold, the light passing through the polarized laser medium 4 is approximately parallel light, the total reflection mirror 3 is a plane mirror, and one side facing the polarized laser medium 4 is plated with a laser high reflection film; when the thermal effect of the polarized laser medium 4 is obvious, for example, greater than a second preset threshold, in order to achieve better effect, in order to make the incident light and the reflected light of the total reflection mirror 3 coincide, the total reflection mirror 3 is a concave mirror or a convex mirror, the concave surface or the convex surface of the polarization laser medium 4 faces the polarization laser medium 4, and one side of the polarization laser medium 4 faces the polarization laser medium is plated with a laser high-reflection film, wherein the choice of the concave or convex surface of the holophote 3 is determined by the distance between the holophote 3 and the polarization gain medium 4, such as when the polarization gain medium 4 produces a positive thermal lens effect, the amplified laser light generated by the linearly polarized light passing through the polarized laser medium 4 is converged, and at this time, when the distance between the total reflection mirror 3 and the polarization gain medium 4 is smaller than the thermal focal length of the polarization laser medium 4, the total reflection mirror 3 is a convex mirror; when the distance between the total reflection mirror 3 and the polarization gain medium 4 is greater than the thermal focal length of the polarization laser medium 4, the total reflection mirror 3 is a concave mirror.
The first preset threshold and the second preset threshold may be equal or unequal, and the specific data may be determined according to the actual application requirement, which is not specifically limited in the present invention.
In an embodiment of the present invention, the polarized laser medium 4 is a laser medium having a polarization property, such as Nd: YVO4, Nd: YAP, Nd: YLF, etc., which have crystal optical axes and the laser light passing through the polarized laser medium 4 has polarization characteristics after being pumped.
In an embodiment of the present invention, the half-wave plate 5 is a polarization device, and is generally made of a uniaxial crystal, and the light-passing surface thereof is parallel to the optical axis of the polarized laser medium 4, and the light-passing direction thereof is perpendicular to the optical axis of the polarized laser medium 4, when the polarized laser light is incident on the surface of the half-wave plate 5, the laser light in two polarization directions, which are parallel to the optical axis and perpendicular to the optical axis, can be projected, and the refractive indexes of the two light beams are different, and when the two light beams are transmitted in the light-passing direction, the two light beams generate a phase difference. When the thickness of the crystal reaches a certain thickness, the phase difference generated by the two beams of light is pi, the wave plate is a half-wave plate, at the moment, after the polarized laser is transmitted by the half-wave plate 5, the polarization state is not changed, the polarized laser is still linearly polarized light, but the polarization direction is changed, and the polarization direction after transmission and the incident polarization direction are symmetrical by an optical axis.
In one embodiment of the present invention, the 45 degree faraday rotator 6 is a rotator using the faraday magneto-optical effect, which means that when polarized laser light is transmitted through a space with a magnetic field, the polarization direction is rotated. The device made by this effect is called a faraday rotator, while the 45-degree faraday rotator 6 is a faraday rotator that rotates the polarization direction by 45 degrees. When linearly polarized light reaches the polarized laser medium 4 through the 45-degree Faraday rotator 6, the 45-degree Faraday rotator 6 enables the linearly polarized light to rotate 45 degrees in the polarization direction of the linearly polarized light, when the linearly polarized light amplified by the polarized laser medium 4 passes through the 45-degree Faraday rotator 6 again, the 45-degree Faraday rotator 6 enables the amplified linearly polarized light to rotate 45 degrees in the polarization direction of the linearly polarized light, and finally the amplified linearly polarized light and input seed laser light are output in the vertical direction.
In an embodiment of the present invention, a P-light high-transmittance film and an S-light high-reflectance film are plated on a surface of the polarizer 7, and are disposed at brewster angle or 45 degrees with respect to an optical axis, and after passing through the polarizer 7, seed laser can only enter the polarized laser medium 4 as P-polarized light. When the seed laser is polarized light and the polarization direction of the seed laser is consistent with the P light, the seed laser completely passes through the polarized laser medium 4 and is amplified, when the polarization direction of the seed laser is inconsistent with the P light, the seed laser only partially passes through the polarized laser medium 4 and is amplified, and when the polarization direction of the seed laser is perpendicular to the P light, the seed laser cannot pass through the polarized laser medium 4.
The polarizing plate 7 may be replaced by a PBS spectroscope or a glan prism.
Based on the laser amplifier disclosed by the technical scheme, the output energy and power of the laser amplifier are adjustable, when the output energy and power of the laser amplifier need to be changed, the change of the included angle of the polarization direction of the laser emitted by the half-wave plate 5 after the optical axis and the seed laser pass through the 45-degree Faraday rotator 6 can be realized, specifically, when the included angle of the polarization direction of the laser emitted by the half-wave plate 5 after the optical axis and the seed laser pass through the 45-degree Faraday rotator 6 is changed, the included angle theta between the polarization direction of the linearly polarized light passing through the half-wave plate 5 and the x axis of the polarized laser medium 4 is changed along with the change of the included angle theta, and at the moment, the output energy and power of the laser amplifier are changed along with the change of the gains of the polarized laser medium.
In principle, after the linearly polarized light output by the 45-degree Faraday rotator 6 passes through the rotatable half-wave plate 5, the polarization direction of the light beam is changed, and assuming that the included angle between the polarization direction of the linearly polarized light and the x axis of the polarized laser medium 4 is theta, the light intensity I is converted into the light intensity I0Projected to the x and y directions of the polarized laser medium 4 respectively, the light intensity in the x direction is Ix＝I0sin2Light intensity in theta, y direction is Iy＝I0cos2Theta, since the polarized laser medium 4 has different gains for light in the x and y directions, the gains in the x and y directions are assumed to be G, respectivelyxAnd GyThe amplified light intensity of the laser passing through the polarized laser medium 4 for the second time is Ix＝I0Gx 2sin2θ，Iy＝I0Gy 2cos2Theta, light intensity after the action of the half-wave plate 5 is Ia＝I0Gx 2sin2θ+I0Gy 2cos2θ＝I0[(Gx 2-Gy 2)sin2θ+Gy 2]It follows that the intensity of the light and the energy and power of the output of the amplifier can be adjusted when the value of θ is changed. When the half-wave plate 5 rotates to a certain angle and the corresponding theta angle is 0 degree, the light intensity of the laser amplifier is Ia＝I0Gy 2When the half-wave plate 5 rotates to another angle, the corresponding theta angle is 90 degrees, the light intensity of the laser amplifier is Ia＝I0Gx 2When the laser amplifier has maximum power or energy.
In an embodiment of the present invention, the pump source 1 adopts a semiconductor laser coupled and output by an optical fiber, and the output pump light has a wavelength of 808nm and a power of 30W; the focusing coupling lens group 2 is composed of two plano-convex lenses, the convex surfaces are opposite, the focal lengths of the plano-convex lenses are respectively 50 mm and 100mm, two mirror surfaces of each plano-convex lens are plated with 808nm antireflection films with the transmittance of more than 99.5%, the full reflecting mirror 3 is a plano-concave lens, the concave surface faces the polarized laser medium 4, the curvature radius of the full reflecting mirror 3 is 100mm, and the concave mirror surface of the plano-concave lens is plated with a 1064nm high reflection film with the reflectance of more than 99.9%; the polarized laser medium 4 is 3 × 3 × 10mm of Nd: YVO4, wherein two end faces of the crystal are plated with 1064nm antireflection films with the transmittance of more than 99.9%; the light transmission caliber of the half-wave plate 5 is 10mm, both sides of the half-wave plate are plated with anti-reflection films of 1064nm, and the transmittance is more than 99%; the light transmission caliber of the 45-degree Faraday rotator 6 is 4mm, and both sides of a magneto-optical crystal of the Faraday rotator are plated with anti-reflection films of 1064nm, and the transmittance is more than 99%; the polaroid 7 is a polaroid placed at 45 degrees, a P light high-transmittance film and an S light high-reflection film are plated on the surface of the polaroid 7, the P light transmittance is greater than 98%, the S light reflectance is greater than 99%, in order to fully utilize seed laser, the seed laser is incident in the P polarization direction of the polaroid 7, the seed laser sequentially enters the polaroid 7, the 45-degree Faraday rotator 6 and the half-wave plate 5 along the reverse direction of pump light, and when the seed laser passes through Nd: after YVO4, the seed laser is amplified, and under the action of the holo-mirror 3, the amplified laser sequentially passes through Nd: YVO4, half-wave plate 5 and 45-degree faraday rotator 6, and finally reflected out through polarizer 7.
When the energy and the power output by the laser amplifier need to be changed, an included angle between the optical axis of the half-wave plate 5 and the emergent polarization direction of the seed laser after passing through the 45-degree Faraday rotator 6 is changed, and the polarization direction of the linearly polarized light after passing through the half-wave plate 5 and the Nd: the included angle theta between the YVO4x axes changes, and the output energy and power of the laser amplifier also change at the same time. When the half-wave plate 5 rotates to a certain angle and the corresponding theta angle is 0 degree, the light intensity of the laser amplifier is Ia＝10Gy 2When the half-wave plate 5 rotates to another angle corresponding to the minimum power or energy of the laser amplifier, and the corresponding theta angle is 90 degrees, the light intensity of the laser amplifier is Ia＝I0Gx 2This time corresponding to the maximum power or energy of the laser amplifier.
The laser amplifier based on the polarization synthesis laser gain provided by the invention can realize the purposes of controlling the synthesis laser gain of the laser amplifier and finally controlling the energy of output laser by rotating the half-wave plate under the condition that the injection energy of the amplifier is certain, namely the heat effect of a laser system is not changed. Specifically, for the invention, when the output energy or power of the laser amplifier needs to be changed, only the half-wave plate needs to be rotated, and the included angle between the optical axis of the half-wave plate and the laser emergent polarization direction of the 45-degree faraday rotator needs to be changed.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A laser amplifier based on polarization-combined laser gain, the laser amplifier comprising: the device comprises a pumping source (1), a focusing coupling mirror group (2), a total reflection mirror (3), a polarized laser medium (4), a half-wave plate (5), a 45-degree Faraday rotator (6) and a polaroid (7), wherein:
the pump source (1), the focusing coupling mirror group (2), the total reflection mirror (3), the polarized laser medium (4), the half-wave plate (5), the 45-degree Faraday rotator (6) and the polaroid (7) are sequentially and coaxially arranged in an optical mode;
the pump light generated by the pump source (1) is firstly converged by the focusing coupling mirror group (2), then passes through the total reflection mirror (3), and finally is absorbed by the polarized laser medium (4), so that the polarized laser medium particles jump to the upper laser level to form population inversion;
seed laser is input into the polaroid sheet (7) along the reverse direction of pump light to form linearly polarized light, the linearly polarized light sequentially enters the 45-degree Faraday rotator (6), the half-wave plate (5) and the polarized laser medium (4), after the linearly polarized light passes through the polarized laser medium (4) with the formed population inversion, the linearly polarized light is amplified, under the action of the total reflection mirror (3), the amplified linearly polarized light sequentially passes through the polarized laser medium (4), the half-wave plate (5) and the 45-degree Faraday rotator (6), and finally is reflected and output by the polaroid sheet (7);
the polarized laser medium (4) and the half-wave plate (5) form a polarized composite gain control functional module, and the composite laser gain of the laser amplifier is controlled by rotating the half-wave plate (5);
when the energy and the power output by the laser amplifier need to be changed, the change of the included angle between the optical axis of the half-wave plate (5) and the emergent polarization direction of the seed laser after passing through the 45-degree Faraday rotator (6) is realized.
2. A laser amplifier according to claim 1, characterized in that the pump source (1) is a direct output semiconductor laser, the wavelength corresponding to the absorption peak of the polarized laser medium (4);
the focusing coupling mirror group (2) is composed of two cylindrical mirrors and a convex lens, wherein the cylindrical mirrors are orthogonally arranged, one side of each cylindrical mirror is a plane, the other side of each cylindrical mirror is a convex surface, and the planes of the cylindrical mirrors are opposite to the pumping source (1).
3. A laser amplifier according to claim 1, characterized in that the pump source (1) is a fiber coupled-out semiconductor laser with a wavelength corresponding to the absorption peak of the polarized laser medium (4);
the focusing coupling lens group (2) consists of two plano-convex lenses, and the convex surfaces of the two plano-convex lenses are opposite.
4. A laser amplifier according to any one of claims 1-3, characterized in that the all-reflecting mirror (3) is one of a plane mirror, a concave mirror and a convex mirror, and the side facing the polarized laser medium (4) is coated with a laser high-reflection film.
5. The laser amplifier according to claim 4, characterized in that when the thermal effect of the polarized laser medium (4) is smaller than a first preset threshold, the light passing through the polarized laser medium (4) is parallel light, and the total reflection mirror (3) is a plane mirror; when the heat effect of the polarized laser medium (4) is greater than a second preset threshold value, the incident light and the reflected light of the total-reflection mirror (3) are overlapped, the total-reflection mirror (3) is a concave mirror or a convex mirror, and the concave surface or the convex surface of the total-reflection mirror faces the polarized laser medium (4).
6. Laser amplifier according to claim 1, characterized in that the polarized laser medium (4) is a laser medium with polarization properties and has a crystal optical axis.
7. A laser amplifier according to claim 1, characterized in that the half-wave plate (5) is a polarizing device made of a uniaxial crystal with a light-passing surface parallel to the optical axis of the polarized laser medium (4) and a light-passing direction perpendicular to the optical axis of the polarized laser medium (4).
8. A laser amplifier according to claim 1, characterized in that the 45 degree faraday rotator (6) is a rotator utilizing the faraday magneto-optical effect.
9. The laser amplifier according to claim 1, wherein the polarizer (7) is surface-coated with a P-light high-transmittance film and an S-light high-reflectance film to be placed at brewster' S angle or 45 degrees from the optical axis.
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| CN113839296B (en) * | 2021-08-18 | 2024-04-05 | 大族激光科技产业集团股份有限公司 | Wavelength locking LD resonance pumping picosecond amplifier |
| CN114719951A (en) * | 2022-03-01 | 2022-07-08 | 天津大学 | Optical system suitable for measuring micro-vibration |
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| US20120140782A1 (en) * | 2010-12-07 | 2012-06-07 | Raytheon Company | Low timing jitter, single frequency, polarized laser |
| CN107565352B (en) * | 2017-09-05 | 2019-04-12 | 南京大学 | A kind of laser exporting the tunable Laguerre Gaussian beam of 1064nm |
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