CN106451054B - Thermal depolarization complete compensation device of multi-pass laser amplifier and application method thereof - Google Patents
Thermal depolarization complete compensation device of multi-pass laser amplifier and application method thereof Download PDFInfo
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- CN106451054B CN106451054B CN201611071469.XA CN201611071469A CN106451054B CN 106451054 B CN106451054 B CN 106451054B CN 201611071469 A CN201611071469 A CN 201611071469A CN 106451054 B CN106451054 B CN 106451054B
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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
- H01S3/1003—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 tunable optical elements, e.g. acousto-optic filters, tunable gratings
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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
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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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- 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
- H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
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- Optics & Photonics (AREA)
- Lasers (AREA)
Abstract
The invention relates to a thermal depolarization complete compensation device of a multi-path laser amplifier and a use method thereof, belonging to the technical field of high-power solid lasers.
Description
Technical Field
The invention belongs to the technical field of high-power solid lasers, and particularly relates to a thermal depolarization complete compensation device of a multi-pass laser amplifier and a use method thereof.
Background
In recent years, high-power solid-state laser technology has been rapidly developed, and various large-scale solid-state lasers such as NIF and Nova in the united states, and glabrous II and glabrous III in china have been sequentially produced. In such large solid-state laser devices, the multi-pass laser amplifier plays a very important role, directly determining the output capability of the whole device. Although laser amplifiers have made significant breakthroughs in the decades, thermal management has been a bottleneck limiting the development of laser amplifiers, especially thermal depolarization due to thermally induced birefringence, which severely degrades the beam quality of the output laser, greatly limits the output power, and is prone to permanent damage to the optical components.
The existing common thermal depolarization compensation method comprises the following steps: the double electro-optical Q-switched crystal compensates the thermal depolarization of the laser medium, and a double laser head adds a 90-degree rotor and the like. The two compensation modes can completely compensate thermal depolarization, but the first method requires the two photoelectric switches to have the same response, the second method requires the two laser heads to have the same thermal depolarization, and the two methods have higher requirements on each component, so that the cost of the whole system is increased, and meanwhile, the system debugging difficulty is increased. The device for eliminating the thermal depolarization effect in the laser amplifier is named as CN102545009A, and 2 optical rotators are combined to eliminate the thermal depolarization effect of a working medium in the laser amplifier, although the polarization state of laser reflected by a reflecting mirror is rotated by 90 degrees, due to diffraction phenomenon of the laser, an emergent point of the laser emitted by the laser amplifier and an incident point of the laser reflected by the reflecting mirror on the laser amplifier cannot be completely overlapped, so that the thermal depolarization cannot be completely compensated.
Disclosure of Invention
In view of various shortcomings of the prior art, the inventors found in long-term practice that: the single laser amplifying head is matched with two rotators, and meanwhile, 2 imaging systems are adopted, so that any section of a gain medium in the laser amplifying head returns to the original position through image transmission and a total reflection mirror, and the complete compensation of thermal depolarization is ensured.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the utility model provides a thermal depolarization complete compensation arrangement in multipass laser amplifier, includes main light path and side light path, along laser injection direction, main light path is sharp structure, and it includes polarizer, 1/4 wave plate, electro-optical switch, first imaging system, first optical rotatory ware, laser amplification head, second optical rotatory ware, second imaging system and first total reflection mirror in proper order, the side light path comprises second total reflection mirror, and the laser that is reflected by second total reflection mirror is annotated in the main light path again through the polarizer.
Further, the first imaging system consists of a first lens and a second lens, and the center positions of the second total reflection mirror and the laser amplifying head are mutually imaged through the first imaging system.
Further, the second imaging system is composed of a third lens and a fourth lens, and the center positions of the first total reflection mirror and the laser amplifying head are mutually imaged through the second imaging system.
Further, the first optical rotator and the second optical rotator are Faraday optical rotators, and the first optical rotator and the second optical rotator rotate the polarization state of the laser in the same direction.
Further, the first optical rotator and the second optical rotator are Faraday optical rotators, and the first optical rotator and the second optical rotator rotate the polarization state of the laser in opposite directions.
Further, the rotation angles of the first optical rotator and the second optical rotator to the polarization state of the laser are 45 degrees.
Further, the working voltage of the electro-optical switch is 1/4 wave voltage corresponding to the laser wavelength.
Further, the included angle between the optical axis of the 1/4 wave plate and the laser injection direction is 45 degrees.
In addition, the invention also provides a using method of the thermal depolarization complete compensation device of the multi-pass laser amplifier, which comprises the following steps:
(1) On the premise that the electro-optical switch does not apply working voltage, after the laser completes double-pass amplification along the main light path, the laser is injected into the side light path through the polaroid;
(2) Applying working voltage to the electro-optical switch, and injecting the laser returned by the side light path into the main light path again after passing through the polaroid to complete four-path amplification;
(3) Repeating the step (2) until the laser finishes n-2-pass amplification;
(4) The working voltage applied on the electro-optical switch is canceled, the laser returned by the side light path is injected into the main light path again after passing through the polaroid, the laser amplified in the n-way is transmitted through the polaroid and output, in the laser amplifying process, the thermal depolarization generated by the laser amplifying head is compensated by the second optical rotator, and the second optical rotator compensates the change of the polarization state of the laser by the first optical rotator.
Further, the working voltage of the electro-optical switch is 1/4 wave voltage corresponding to the laser wavelength.
The beneficial effects of the invention are as follows:
1. the configuration that adopts single laser amplification head to cooperate with two rotators greatly reduces the cost, simple structure, simultaneously, adopts first imaging system to cooperate with second imaging system for the arbitrary cross-section of gain medium in the laser amplification head returns original position through image transmission and full reflection mirror, realizes the complete compensation of thermal depolarization.
2. The laser amplifying stroke number can be controlled by adjusting the synchronous time sequence of the electro-optical switch and the laser, so that the output capacity of the laser amplifier is more flexible.
3. The first imaging system is matched with the second imaging system, and a strict image transmission method is utilized, so that the near-field light spot quality output by the laser amplifier is improved.
Drawings
FIG. 1 is a schematic top view of the present invention;
FIG. 2 (a) is a near field speckle pattern before thermal depolarization compensation in embodiment two;
(b) Is a near field flare map after thermal depolarization compensation in the second embodiment.
In the accompanying drawings: 1-polaroid, 2-1/4 wave plate, 3-electro-optical switch, 4-first lens, 5-second lens, 6-first optical rotatory plate, 7-laser amplifying head, 8-second optical rotatory plate, 9-third lens, 10-fourth lens, 11-first total reflection mirror, 12-second total reflection mirror;
arrows parallel to the optical path at the polarizer 1 indicate the injection and output directions of the laser light.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings, and based on the embodiments in the present application, other similar embodiments obtained by those skilled in the art without making creative efforts should fall within the scope of protection of the present application.
Embodiment one:
as shown in fig. 1, a thermal depolarization complete compensation device for a multi-pass laser amplifier includes a main optical path parallel to a laser injection direction and a side optical path at an angle to the laser injection direction. The main optical path comprises a polaroid 1, a 1/4 wave plate 2, an electro-optical switch 3, a first imaging system, a first optical rotator 6, a laser amplifying head 7, a second optical rotator 8, a second imaging system and a first total reflection mirror 11 which are arranged in a straight line along the laser injection direction, wherein the second optical rotator 8 is used for compensating the thermal depolarization of the laser amplifying head 7, the first optical rotator 6 is used for compensating the change of the polarization state of the second optical rotator 8, the side light path is formed by the second total reflection mirror 12, and the laser reflected by the second total reflection mirror 12 is injected into the main optical path again through the polaroid 1.
The first imaging system consists of a first lens 4 and a second lens 5, the focal lengths of the first lens 4 and the second lens 5 are f, the distance between the first lens 4 and the second lens 5 is 2f, the distance between the central position of the laser amplifying head 7 and the second lens 5 is f, the distance between the second full-reflecting mirror 12 and the first lens 4 is f, the mutual imaging of the central positions of the second full-reflecting mirror 12 and the laser amplifying head 7 is ensured, the second imaging system consists of a third lens 9 and a fourth lens 10, the focal lengths of the third lens 9 and the fourth lens 10 are f, the distance between the third lens 9 and the fourth lens is 2f, the distance between the central position of the laser amplifying head 7 and the third lens 9 is f, the distance between the first full-reflecting mirror 11 and the fourth lens 10 is f, and the mutual imaging of the central positions of the first full-reflecting mirror 11 and the laser amplifying head 7 is ensured. By using a strict image transmission method, any section of the laser amplification head 7 returns to the original position through image transmission, the first total reflection mirror 11 and the second total reflection mirror 12.
When the laser amplifying head 7 is in a non-working state, the working process of the multi-path laser amplifier is as follows: the deflection state of the laser is horizontal polarization, the laser sequentially passes through the 1/4 wave plate 2, the electro-optical switch 3, the first imaging system, the first rotator 6, the laser amplifying head 7, the second rotator 8, the second imaging system and the first total reflection mirror 11 to be reflected back according to an original light path, the laser passes through the 1/4 wave plate 2 for the second time to become vertical polarized light, the vertical polarized light is incident on the polaroid 1, and the laser completes double-pass amplification, at the moment, the polarization state of the laser is vertical polarization. In the above process, before the laser passes through the electro-optical switch 3 for the second time, no working voltage is applied to the electro-optical switch 3, no phase change is introduced to the laser, after the laser passes through the electro-optical switch 3 for the second time, the working voltage is 1/4 wave voltage corresponding to the laser wavelength, the laser after the two-pass amplification is reflected to the second total reflection mirror 12 through the polarizer 1, and then reflected back to the main light path, when the laser reflected from the side path passes through the electro-optical switch 3 again, the working voltage applied to the electro-optical switch 3 has reached a stable state, and the laser starts the third and fourth pass amplification, because the electro-optical switch 3 is powered up, the effect is equivalent to the 1/4 wave plate 2, therefore, after the four pass amplification is completed, the laser is still vertical polarized light, the laser continues to complete the fifth and sixth pass … n-2 pass amplification, the working voltage applied to the electro-optical switch 3 is cancelled, and the laser after the n-pass amplification is horizontal polarized light, at this time, the horizontal polarized light is transmitted through the polarizer 1 and output.
When the laser amplification head 7 is in a working state, taking neodymium glass as a gain medium as an example, the gain medium adopts a square rod with the length of 8mm multiplied by 8mm, the laser amplification head 7 adopts an LD as a pumping source, the pumping mode is four-side symmetrical pumping, the pumping power is 80kW, and the principles of laser polarization state change and thermal depolarization compensation are as follows:
firstly, the polarization state of the laser passing through the polaroid 1 is horizontal polarized light, because the included angle between the optical axis of the 1/4 wave plate 2 and the laser injection direction is 45 degrees, the laser is changed into circular polarized light after passing through the 1/4 wave plate 2, and then the laser passes through the electro-optical switch 3, the first imaging system and the first optical rotator 6 in sequence, the polarization state of the laser is still circular polarized, and the expression is as follows:wherein E is p (x, y) and E s (x, y) respectively represent the horizontal component and the vertical component of the laser at different positions of the gain medium section, θ represents the included angle between the polarization direction of the laser and the horizontal direction, and due to the thermally induced birefringence of the gain medium, the circularly polarized light becomes elliptically polarized light after passing through the gain medium, and the expressions of the horizontal component and the vertical component are:
wherein A is p (x, y) and A s (x, y) represents the amplitudes of the horizontal and vertical components of the laser light at the different positions, respectively, and δ (x, y) represents the phase delay amounts of the horizontally polarized and vertically polarized light of the laser light at the different positions;
then, the compensation of thermal depolarization essentially means that the horizontal component and the vertical component of each point on the section of the gain medium are both delayed by equal phases, so that if the light emitted from the section of the gain medium is reflected, the polarization state of the light is rotated by 90 degrees and still passes through the emission point after being reflected, the complete compensation of thermal depolarization can be realized. The elliptical polarized light passes through the second optical rotatory plate 8, the second imaging system and the first total reflection mirror 11, the first optical rotatory plate 6 and the second optical rotatory plate 8 are faraday optical rotatory plates, the two optical rotatory plates rotate the polarization state of the laser in the same direction, and the rotation angle of the two optical rotatory plates to the polarization state of the laser is 45 °, that is, the polarization state of the elliptical polarized light rotates 45 ° every time it passes through the faraday optical rotatory plate, the laser emitted by the laser amplifying head 7 passes through the second optical rotatory plate 8 twice, that is, the polarization state of the laser changes by 90 °, the thermal depolarization generated in the amplifying process is compensated, after the elliptical polarized light is reflected by the first total reflection mirror 11, before the second passes through the laser amplifying head 7, the expression of the horizontal component and the vertical component is:
because the first imaging system and the second imaging system exist, an arbitrary section on the gain medium is taken as an object plane, and an image which passes through the second imaging system and is reflected back to the gain medium is still in an original position, namely delta (x, y) =delta' (x, y), so that the complete compensation of thermal depolarization is realized, and after the laser passes through the laser amplifying head 7 for the second time, the expression of horizontal component and vertical component is as follows:
the second time after passing through the laser amplifying head 7, the laser polarization state is changed into circular polarization, the second optical rotatory plate 8 compensates the change of the laser polarization state, the circular polarization is changed into vertical polarization light after passing through the 1/4 wave plate 2 for the second time, and the vertical polarization light is reflected to the side light path from the polarizing plate 1 to complete the double-pass amplification;
finally, the working voltage is applied to the electro-optical switch 3, the laser returned by the side light path is reflected by the polaroid 1 and then is injected into the main light path again, the vertical polarized light is changed into circular polarized light by the 1/4 wave plate 2, the amplification and compensation processes are repeated, the vertical polarized light is changed into vertical polarized light after the fourth time of passing through the 1/4 wave plate 2, the four-pass amplification is completed after the laser is reflected to the side light path from the polaroid 1, the working voltage applied to the electro-optical switch 3 is cancelled until the laser finishes n-2-pass amplification, the vertical polarized light returned by the side light is changed into circular polarized light by the 1/4 wave plate 2 firstly, the laser is changed into horizontal polarized light after the nth time of passing through the 1/4 wave plate 2, and the horizontal polarized light after the n-pass amplification is completed is transmitted through the polaroid 1 and output.
Embodiment two:
the same parts as those of the first embodiment are not repeated, and the difference is that:
the first optical rotator 6 and the second optical rotator 8 rotate the polarization state of the laser in different directions, the laser is output after being amplified in a double-pass way by adjusting the time sequence of the electro-optical switch 3, and near field patterns before and after thermal depolarization compensation are measured by using a CCD (charge coupled device), as shown in figure 2.
Fig. 2 (a) is a near-field light spot diagram before thermal depolarization compensation, and fig. 2 (b) is a near-field light spot diagram after thermal depolarization compensation, and it can be seen from the diagram that under the condition of no depolarization compensation, the near-field has obvious defect, the light beam quality is poor, the light beam is difficult to use, after the depolarization compensation, the light spot near-field is almost complete, namely, the complete compensation of thermal depolarization is realized, the output capability of a laser amplifier is greatly improved, and the near-field light spot quality output by the laser amplifier is improved. In addition, the invention is particularly suitable for high-power lasers operating at heavy frequencies.
The foregoing detailed description of the invention has been presented for purposes of illustration and description, but is not intended to limit the scope of the invention, i.e., the invention is not limited to the details shown and described.
Claims (9)
1. The thermal depolarization complete compensation device of the multi-path laser amplifier is characterized by comprising a main light path and a side light path, wherein the main light path is of a linear structure along the laser injection direction and sequentially comprises a polaroid, a 1/4 wave plate, an electro-optical switch, a first imaging system, a first optical rotator, a laser amplifying head, a second optical rotator, a second imaging system and a first total reflection mirror, the side light path is formed by the second total reflection mirror, and laser reflected by the second total reflection mirror is injected into the main light path again through the polaroid;
the application method of the thermal depolarization complete compensation device of the multi-pass laser amplifier comprises the following steps:
(1) On the premise that the electro-optical switch does not apply working voltage, the laser completes double-pass amplification along the main light path, and then the laser is injected into the side light path through the polaroid;
(2) Applying working voltage to the electro-optical switch, and injecting the laser returned by the side light path into the main light path again after passing through the polaroid to complete four-path amplification;
(3) Repeating the step (2) until the laser finishes n-2-pass amplification;
(4) The working voltage applied on the electro-optical switch is canceled, the laser returned by the side light path is injected into the main light path again after passing through the polaroid, the laser amplified in the n-way is transmitted through the polaroid and output, in the laser amplifying process, the thermal depolarization generated by the laser amplifying head is compensated by the second optical rotator, and the second optical rotator compensates the change of the polarization state of the laser by the first optical rotator.
2. The thermal depolarization complete compensation device of the multi-pass laser amplifier according to claim 1, wherein: the first imaging system consists of a first lens and a second lens, and the center positions of the second total reflection mirror and the laser amplifying head are mutually imaged through the first imaging system.
3. The thermal depolarization complete compensation device of the multi-pass laser amplifier according to claim 1, wherein: the second imaging system consists of a third lens and a fourth lens, and the center positions of the first total reflection mirror and the laser amplifying head are mutually imaged through the second imaging system.
4. The thermal depolarization complete compensation device of the multi-pass laser amplifier according to claim 1, wherein: the first optical rotator and the second optical rotator are Faraday optical rotators, and the first optical rotator and the second optical rotator rotate the polarization state of laser in the same direction.
5. The thermal depolarization complete compensation device of the multi-pass laser amplifier according to claim 1, wherein: the first optical rotator and the second optical rotator are Faraday optical rotators, and the first optical rotator and the second optical rotator rotate the polarization state of the laser in opposite directions.
6. The thermal depolarization complete compensation device for a multi-pass laser amplifier according to claim 4 or 5, wherein: the rotation angles of the first optical rotator and the second optical rotator to the polarization state of the laser are 45 degrees.
7. The thermal depolarization complete compensation device of the multi-pass laser amplifier according to claim 1, wherein: the working voltage of the electro-optical switch is 1/4 wave voltage corresponding to the laser wavelength.
8. The thermal depolarization complete compensation device of the multi-pass laser amplifier according to claim 1, wherein: the included angle between the optical axis of the 1/4 wave plate and the laser injection direction is 45 degrees.
9. A thermal depolarization complete compensation device in a multi-pass laser amplifier according to any one of claims 1-8, characterized in that: the working voltage of the electro-optical switch is 1/4 wave voltage corresponding to the laser wavelength.
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| CN107132673B (en) * | 2017-07-19 | 2023-09-26 | 中国工程物理研究院激光聚变研究中心 | Device for eliminating depolarization of electro-optic crystal |
| CN111308753A (en) * | 2019-11-15 | 2020-06-19 | 中国科学院上海光学精密机械研究所 | High damage threshold liquid crystal optical panel with random depolarization compensation and exposure device thereof |
| CN113381283A (en) * | 2021-06-11 | 2021-09-10 | 福州市纳飞光电科技有限公司 | Compact pulse laser amplifier |
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