CN112968341B - Energy attenuation device for broadband ultrashort laser - Google Patents
Energy attenuation device for broadband ultrashort laser Download PDFInfo
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- CN112968341B CN112968341B CN202110138461.5A CN202110138461A CN112968341B CN 112968341 B CN112968341 B CN 112968341B CN 202110138461 A CN202110138461 A CN 202110138461A CN 112968341 B CN112968341 B CN 112968341B
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- wedge plate
- polaroid
- ultrashort laser
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- laser
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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
- H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
- H01S3/0057—Temporal shaping, e.g. pulse compression, frequency chirping
Abstract
The device consists of a half wave plate, a first wedge plate polaroid with single-sided coating, a second wedge plate polaroid with single-sided coating and an absorption tank, wherein the polarization direction of the broadband ultrashort laser is modulated through the half wave plate, the S component reflected light of the broadband ultrashort laser is subjected to polarization detection through the first wedge plate polaroid, the continuous attenuation adjustment of the pulse energy of the broadband ultrashort laser is realized through rotating the angle of the half wave plate, and the reflected light direction of the second wedge plate polaroid is parallel to the incident broadband ultrashort laser of the first wedge plate polaroid by utilizing the second wedge plate polaroid. The device can reduce the energy loss in the transmission process of the broadband ultrashort laser and the probability of damaging optical elements in a laser system, avoid the dispersion effect and the pulse width broadening generated in the transmission process of the broadband ultrashort laser, and facilitate the collimation and the adjustment of subsequent light paths.
Description
Technical Field
The invention relates to a device for attenuating pulse energy in a broadband ultrashort laser related application system.
Background
Almost all laser applications require attenuation of the output pulse energy or power, most of which require attenuation of the energy while maintaining the temporal, spatial profile of the beam intensity. In order to meet the requirement, the common practice is to keep the laser to output stably, and externally add a pulse energy attenuation device, wherein the most common is a combined structure of a half-wave plate and a polaroid, the polarization direction of laser is regulated and controlled through the rotation angle of the half-wave plate, and the polarization of the polaroid is utilized to control the transmitted laser energy, so that continuous attenuation adjustment of laser energy flow is realized.
But this approach has many drawbacks for broadband ultrashort lasers. Firstly, the broadband ultrashort laser has wider bandwidth, and can bring obvious pulse width broadening due to dispersion effect when passing through an optical material; secondly, the peak power of the ultra-short laser pulse is higher, and the change of the optical characteristics of the material is caused by the action of a strong electric field in the process of passing through the optical material, so that the spatial distribution of the transmitted light beam is influenced; again, due to the complexity of the polarizing film preparation process, the back surface is often not coated with an antireflection film, so that the back surface reflected light is difficult to eliminate, and certain energy loss exists, which is extremely important for ultra-short lasers, especially commercial broadband ultra-short lasers, because the total output energy is usually not high, and the loss reduction is very necessary; finally, the influence on the element itself in the process of passing the strong laser is not negligible, and the element is extremely likely to be damaged after long-term use.
Disclosure of Invention
In order to solve the problems, the invention provides an energy attenuation device of broadband ultrashort laser, which can reduce energy loss in the transmission process and the probability of damaging optical elements in a laser system, and avoid dispersion effect and pulse width broadening of a transmission element on the broadband ultrashort laser.
The technical scheme of the invention is as follows:
the energy attenuation device of the broadband ultrashort laser is characterized by comprising a half wave plate, a first wedge plate polaroid, a second wedge plate polaroid, a first absorption cell, a second absorption cell, a third absorption cell and a fourth absorption cell;
the half-wave plate is vertically arranged along the transmission direction of the broadband ultrashort laser output by the broadband ultrashort laser, the transmitted light passing through the half-wave plate is incident to the first wedge plate polaroid, and the front surface of the first wedge plate polaroid forms 90-theta with the transmission direction of the broadband ultrashort laser B Wherein θ B Is the Confucian angle;
placing the second wedge plate polaroid in the direction of the reflected light of the front surface of the first wedge plate polaroid, wherein the front surface of the second wedge plate polaroid is parallel to the front surface of the first wedge plate polaroid, so that the reflected light of the front surface of the second wedge plate polaroid is parallel to the incident light of the first wedge plate polaroid;
the first absorption cell and the second absorption cell are respectively arranged in the transmission light direction and the reflection light direction of the rear surface of the first wedge plate polaroid
The third absorption cell and the fourth absorption cell are respectively arranged in the transmission light direction of the second wedge plate polaroid and the reflection light direction of the rear surface.
The polarization direction of the broadband ultrashort laser output by the broadband ultrashort laser is changed by rotating the half-wave plate, S-component reflected light of the broadband ultrashort laser is subjected to polarization detection by the first wedge plate polaroid, so that continuous attenuation adjustment of laser pulse energy is realized, the purpose that the reflected light direction of the second wedge plate polaroid is parallel to the broadband ultrashort laser incident by the first wedge plate polaroid is conveniently realized by utilizing the second wedge plate polaroid, and the device can reduce energy loss in the transmission process of the broadband ultrashort laser and the probability of damage to optical elements in a laser system, and avoid dispersion effect and pulse width broadening generated in the transmission process of the broadband ultrashort laser.
The front surface of the first wedge plate polaroid is a coating surface, the front surface of the second wedge plate polaroid is a coating surface, and the wedge bottom surface of the polaroid is close to the reflected light directions of the first wedge plate polaroid and the second wedge plate polaroid.
Compared with the prior art, the invention has the advantages that:
1. the reflected light of the polaroid is used for energy attenuation, so that the dispersion effect and the pulse width broadening of the broadband ultra-short laser when passing through the transmission optical element can be avoided, the energy loss generated when the ultra-short laser passes through the transmission optical element is reduced, and the method is particularly important for a low-energy broadband ultra-short laser system;
2. the laser damage resistance of the optical element under the S component is better than that of the optical element under the P component, and the S component of the reflected light is used for energy attenuation, so that the damage probability of the optical element in a laser system can be reduced;
3. the substrate of the polaroid is designed into a wedge shape, so that two beams of reflected light on the front surface and the rear surface can be separated, and the influence on the pulse energy and the light intensity space distribution stability caused by the interference of the two beams of light is avoided;
4. the two identical wedge plate polaroids are used for energy attenuation, the front surface and the rear surface of the placement direction are parallel, on one hand, the direction of emergent light passing through the energy attenuation device is guaranteed to be parallel to the incident broadband ultrashort laser, the construction and collimation of a subsequent light path are facilitated, on the other hand, the intersection of reflected light on the front surface and the rear surface of each wedge plate polaroid can be avoided, the laser intensity point is brought to the light path, and the safety of the device is guaranteed.
Drawings
FIG. 1 is a schematic view of the optical path of the energy attenuation device of the broadband ultrashort laser of the present invention.
FIG. 2 is a schematic view of a wedge plate polarizer.
In the figure, the laser is 11-broadband ultrashort laser, 12-half-wave plate, 13-first wedge plate polaroid, 14-second wedge plate polaroid, 15-first absorption cell, 16-second absorption cell, 17-third absorption cell and 18-fourth absorption cell.
Detailed Description
The invention is further described below with reference to the accompanying drawings, which should not be taken as limiting the scope of the invention.
Referring to fig. 1, an optical path diagram of an energy attenuation device of a broadband ultrashort laser according to the present invention is shown, and the energy attenuation device of the broadband ultrashort laser includes a broadband ultrashort laser 11, a half-wave plate 12, a first wedge plate polarizer 13 with single-sided coating, a second wedge plate polarizer 14 with single-sided coating, a first absorption cell 15, a second absorption cell 16, a third absorption cell 17, and a fourth absorption cell 18. The above-mentioned components are related as follows:
the half-wave plate 12 is vertically arranged along the transmission direction of the broadband ultra-short laser output by the broadband ultra-short laser 11; the transmitted light of the half-wave plate 12 is incident to the first wedge plate polarizer 13, and the front surface of the first wedge plate polarizer 13 and the transmitting side of the broadband ultrashort laser 11Oriented 90 ° - θ B Wherein θ B Is the Confucian angle; placing the second wedge plate polarizer 14 in the direction of the reflected light of the front surface of the first wedge plate polarizer 13, wherein the front surface of the second wedge plate polarizer 14 is parallel to the front surface of the first wedge plate polarizer 13, so that the direction of the reflected light of the front surface of the second wedge plate polarizer 14 is parallel to the direction of the incident light of the first wedge plate polarizer 13;
the front surface of the first wedge plate polaroid 13 is a coating surface, the front surface of the second wedge plate polaroid 14 is a coating surface, and the wedge bottom surface of the polaroid is close to the reflected light directions of the first wedge plate polaroid 13 and the second wedge plate polaroid 14; the first absorption cell 15, the second absorption cell 16, the third absorption cell 17, and the fourth absorption cell 18 are sequentially disposed in the light transmission direction and the back surface reflection direction of the first wedge plate polarizer 13, and in the light transmission direction and the back surface reflection direction of the second wedge plate polarizer 14.
The polarization direction of the ultra-short laser is changed by rotating the angle of the half-wave plate 12, the S-component reflected light of the broadband ultra-short laser output by the broadband ultra-short laser 11 is subjected to polarization detection by the first wedge plate polarizing plate 13, so that continuous attenuation adjustment of the broadband ultra-short laser is realized, the purpose that the reflected light direction of the second wedge plate polarizing plate 14 is parallel to the broadband ultra-short laser 11 incident by the first wedge plate polarizing plate 13 is conveniently realized by utilizing the second wedge plate polarizing plate 14, and the device can reduce energy loss in the transmission process of the broadband ultra-short laser and the probability of damage of optical elements in a laser system, and avoid dispersion effect and pulse width widening generated in the transmission process of the broadband ultra-short laser.
Please refer to fig. 2. Fig. 2 is a schematic diagram showing the change of polarization state of the broadband ultrashort laser passing through the first wedge plate polarizer 13 and the second wedge plate polarizer 14. When the broadband ultrashort laser is incident to the first wedge plate polaroid 13, the P component penetrates through the first wedge plate polaroid 13, and the S component is reflected by the front surface of the first wedge plate polaroid and then is incident to the second wedge plate polaroid 14; the two reflected lights on the front surface and the rear surface are separated due to the wedge-shaped design of the polaroid substrate, so that the influence of interference of the two lights on the pulse energy and the light intensity space distribution stability is avoided; and the transmitted light and the rear surface reflected light of the first wedge plate polarizer 13 and the transmitted light and the rear surface reflected light of the second wedge plate polarizer 14 are absorbed by the absorption cell.
Claims (3)
1. The energy attenuation device of the broadband ultrashort laser is characterized by comprising a half wave plate (12), a first wedge plate polaroid (13), a second wedge plate polaroid (14), a first absorption cell (15), a second absorption cell (16), a third absorption cell (17) and a fourth absorption cell (18);
the half-wave plate (12) is vertically arranged along the transmission direction of the broadband ultrashort laser output by the broadband ultrashort laser (11), the transmitted light passing through the half-wave plate (12) is incident to the first wedge plate polaroid (13), and the front surface of the first wedge plate polaroid (13) forms 90-theta with the transmission direction of the broadband ultrashort laser B Wherein θ B Is the Confucian angle;
placing the second wedge plate polarizer (14) in the direction of the reflected light of the front surface of the first wedge plate polarizer (13), wherein the front surface of the second wedge plate polarizer (14) is parallel to the front surface of the first wedge plate polarizer (13), and the reflected light of the front surface of the second wedge plate polarizer (14) is parallel to the incident light of the first wedge plate polarizer (13);
the light beam incident surface and the emergent surface of the first wedge plate polaroid (13) are not parallel, and the light beam incident surface and the emergent surface of the second wedge plate polaroid (14) are not parallel;
the first absorption cell (15) and the second absorption cell (16) are respectively arranged in the transmission light direction of the first wedge plate polaroid (13) and the reflection light direction of the rear surface;
the third absorption cell (17) and the fourth absorption cell (18) are respectively arranged in the transmission light direction of the second wedge plate polaroid (14) and the reflection light direction of the rear surface.
2. The energy attenuation device of the broadband ultrashort laser according to claim 1, wherein the polarization direction of the broadband ultrashort laser is changed by rotating the half-wave plate (12), the S component of the broadband ultrashort laser is subjected to polarization analysis by the first wedge plate polarizer (13), continuous attenuation adjustment of laser energy is achieved, and the reflected light direction of the second wedge plate polarizer (14) is parallel to the incident laser of the first wedge plate polarizer (13) by the second wedge plate polarizer (14).
3. The energy attenuation device of broadband ultrashort laser according to claim 1, wherein the first wedge plate polarizer (13) and the second wedge plate polarizer (14) have the same shape and size, the front surface of the first wedge plate polarizer (13) and the front surface of the second wedge plate polarizer (14) are coated surfaces, and the wedge bottom surface of the polarizer is close to the reflected light directions of the first wedge plate polarizer (13) and the second wedge plate polarizer (14).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110138461.5A CN112968341B (en) | 2021-02-01 | 2021-02-01 | Energy attenuation device for broadband ultrashort laser |
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| CN202110138461.5A CN112968341B (en) | 2021-02-01 | 2021-02-01 | Energy attenuation device for broadband ultrashort laser |
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| CN112968341B true CN112968341B (en) | 2023-05-09 |
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| CN113644537A (en) * | 2021-07-02 | 2021-11-12 | 中国科学院上海光学精密机械研究所 | Device for controlling broadband laser output energy |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1222682A (en) * | 1997-11-07 | 1999-07-14 | 三星电子株式会社 | Multi-stage combined optical device |
| CN106058628A (en) * | 2016-07-13 | 2016-10-26 | 中国工程物理研究院应用电子学研究所 | Output laser continuous energy adjustment device |
| CN211955982U (en) * | 2019-11-18 | 2020-11-17 | 罗根激光科技（武汉）有限公司 | High-precision continuously adjustable stable output laser power attenuation device |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030030888A1 (en) * | 2001-08-09 | 2003-02-13 | Kiyohide Sakai | Optical isolator, laser module and optical amplifier |
| US7259914B2 (en) * | 2005-08-30 | 2007-08-21 | Coherent, Inc. | Attenuator for high-power unpolarized laser beams |
| CN201352291Y (en) * | 2009-02-23 | 2009-11-25 | 福州高意通讯有限公司 | Laser attenuator |
| TW201521306A (en) * | 2013-11-28 | 2015-06-01 | U & U Engineering Inc | Laser energy output control apparatus and method thereof |
| CN208401245U (en) * | 2018-08-01 | 2019-01-18 | 苏州帕沃激光科技有限公司 | A kind of laser debugging facula measurement and attenuating device |
| CN209417435U (en) * | 2018-12-27 | 2019-09-20 | 大族激光科技产业集团股份有限公司 | A kind of adjustable laser attenuator assembly |
| CN112099243A (en) * | 2020-10-15 | 2020-12-18 | 富通尼激光科技（东莞）有限公司 | Laser power attenuator |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1222682A (en) * | 1997-11-07 | 1999-07-14 | 三星电子株式会社 | Multi-stage combined optical device |
| CN106058628A (en) * | 2016-07-13 | 2016-10-26 | 中国工程物理研究院应用电子学研究所 | Output laser continuous energy adjustment device |
| CN211955982U (en) * | 2019-11-18 | 2020-11-17 | 罗根激光科技（武汉）有限公司 | High-precision continuously adjustable stable output laser power attenuation device |
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