CN107942529B - Pulse width switching coaxial co-polarized laser and coaxial co-polarized laser output method - Google Patents
Pulse width switching coaxial co-polarized laser and coaxial co-polarized laser output method Download PDFInfo
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- G—PHYSICS
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/286—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising for controlling or changing the state of polarisation, e.g. transforming one polarisation state into another
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- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/283—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for beam splitting or combining
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Abstract
The invention provides a pulse width switching coaxial co-polarized laser and a coaxial co-polarized laser output method, which comprises the following steps: a first pulse width laser, a second pulse width laser, a polarization coaxial and a movable polarization state 90-degree rotator; the first pulse width laser outputs horizontally polarized light, and the second pulse width laser outputs vertically polarized light; and a polarization coaxial device is arranged on the output light path of the first pulse width laser and the output light path of the second pulse width laser, and a movable polarization state 90-degree rotator is arranged on the output light path of the polarization coaxial device. The advantages are that: the coaxial same-polarization laser is switched by the pulse width, so that the first pulse width laser and the second pulse width laser can output coaxial same-polarization laser, and therefore, laser beams output by different pulse width lasers can share the same set of laser amplifier and the test system with the same test parameters, and the cost and the operation complexity of the subsequent amplifier and the test application system are reduced.
Description
Technical Field
The invention belongs to the technical field of laser processing, and particularly relates to a pulse width switching coaxial co-polarized laser and a coaxial co-polarized laser output method.
Background
As is well known, semiconductor lasers are widely used in various fields due to the advantages of small size, high photoelectric conversion efficiency, long service life and the like, and have wide application and great development prospects in the fields of solid laser pumping, material processing, laser medical treatment, fiber laser pump sources and the like.
At present, for lasers, a plurality of technologies are researched as polarization beam combination technologies, and the outputs of a plurality of fiber lasers are combined into one beam through optical components by the polarization beam combination technologies, so that the output power and brightness of the lasers are greatly improved, the situation that a single fiber laser works at the limit for improving the power is avoided, and the stability and reliability of the high-power pulse output performance are ensured.
The light beam formed by the polarization beam combining technology is light which simultaneously contains two orthogonal polarization states, so that the obtained light beam cannot be amplified by a polarization amplifier and can only be directly output for specific applications.
However, for some applications, it is not necessary to combine the outputs of two fiber lasers into one beam. For example, in some occasions, two lasers, namely a laser A and a laser B, are independently configured, and a light beam output by the laser A enters a light beam testing system after passing through a laser amplifier A; after passing through the laser amplifier B, the light beam output by the laser B enters a light beam testing system. For testing purposes, the polarization states of the beam output by laser a and the beam output by laser B are different, whereby the following problems arise: when the test parameters of the test system are adjusted, the test system is used for testing the light beam output by the laser A, and then the test parameters of the test system are required to be readjusted, so that the test system can be used for testing the light beam output by the laser B, and the test load is increased; in addition, since the polarization states of the light beams output by the laser a and the laser B are different, the laser a and the laser B need to be configured with one laser amplifier independently, and the same laser amplifier cannot be shared, thereby increasing purchase cost.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention provides a pulse width switching coaxial co-polarized laser and a coaxial co-polarized laser output method, which can effectively solve the problems.
The technical scheme adopted by the invention is as follows:
The invention provides a pulse width switching coaxial co-polarized laser, comprising: the device comprises a first pulse width laser (1), a second pulse width laser (2), a polarization coaxial device (3) and a movable polarization state 90-degree rotator (4);
The first pulse width laser (1) outputs horizontally polarized light, and the second pulse width laser (2) outputs vertically polarized light; the polarization coaxial device (3) is arranged on the output light path of the first pulse width laser (1) and the output light path of the second pulse width laser (2), and the movable polarization state 90-degree rotator (4) is arranged on the output light path of the polarization coaxial device (3).
Preferably, the polarization coaxial device (3) comprises a 1 st horizontal polarizer (3.1) and a 2 nd horizontal polarizer (3.2);
setting the 1 st horizontal polaroid (3.1) according to the Brewster angle on an output light path of the first pulse width laser (1), so that the horizontal polarized light output by the first pulse width laser (1) is completely transmitted through the 1 st horizontal polaroid (3.1) and enters a main light path;
setting the 2 nd horizontal polaroid (3.2) according to the Brewster angle on an output light path of the second pulse width laser (2), and reflecting vertical polarized light output by the second pulse width laser (2) to the 1 st horizontal polaroid (3.1) after the reflection effect of the 2 nd horizontal polaroid (3.2); and then reflected to the main light path after passing through the reflection effect of the 1 st horizontal polaroid (3.1).
Preferably, the movable polarization state 90 degree rotator (4) comprises a rotator driving mechanism and a polarization state 90 degree rotator; the driving mechanism is used for driving the polarization state 90-degree rotator to enter or leave the main light path.
Preferably, the polarization state 90-degree rotator is a half-wave plate or a 90-degree rotator.
Preferably, the rotator driving mechanism comprises a motor.
Preferably, the movable polarization state 90-degree rotator (4) further comprises a limit switch; when the polarization state 90-degree rotator enters the main light path, the limit switch is disconnected; and triggering the limit switch to be conducted when the polarization state 90-degree rotator leaves the main light path.
Preferably, the system further comprises a controller;
The controller is respectively and electrically connected with the first pulse width laser (1), the second pulse width laser (2), the rotator driving mechanism and the limit switch.
The invention also provides a coaxial co-polarized laser output method based on the pulse width switching coaxial co-polarized laser, which comprises the following steps:
step 1, when coaxial co-polarized light of light output by a first pulse width laser (1) needs to be obtained, a controller detects whether a polarization state 90-degree rotator is positioned on a main light path, if so, the polarization state 90-degree rotator is driven to leave the main light path, and then step 2 is executed; if not, directly executing the step 2;
Step 2, the controller starts a first pulse width laser (1), the first pulse width laser (1) outputs horizontal polarized light, and the horizontal polarized light completely transmits through a 1 st horizontal polarizer (3.1) in the polarization coaxial device (3) and enters a main light path, so that a 1 st horizontal polarized state laser beam is obtained;
step 3, when coaxial co-polarized light of the light output by the second pulse width laser (2) needs to be obtained, the controller detects whether the polarization state 90-degree rotator is positioned on the main light path, and if so, the step 4 is directly executed; if not, driving the polarization state 90-degree rotator to enter the main light path, and then executing the step 4;
Step 4, the controller starts a second pulse width laser (2), the second pulse width laser (2) outputs vertical polarized light, and the vertical polarized light is reflected to the 1 st horizontal polaroid (3.1) after passing through the reflection effect of the 2 nd horizontal polaroid (3.2); then, the laser beam enters a polarization state 90-degree rotator after the reflection effect of a1 st horizontal polaroid (3.1), and the polarization state 90-degree rotator converts the vertical polarized light into horizontal polarized light to obtain a2 nd horizontal polarized laser beam; the 2 nd horizontal polarization state laser beam and the 1 st horizontal polarization state laser beam are coaxial laser beams with the same polarization state.
The pulse width switching coaxial co-polarized laser and the coaxial co-polarized laser output method provided by the invention have the following advantages:
The coaxial same-polarization laser is switched by the pulse width, so that the first pulse width laser and the second pulse width laser can output coaxial same-polarization laser, and therefore, laser beams output by different pulse width lasers can share the same set of laser amplifier and the test system with the same test parameters, and the cost and the operation complexity of the subsequent amplifier and the test application system are reduced.
Drawings
Fig. 1 is a schematic diagram of the structure principle of a pulse width switching coaxial co-polarized laser provided by the invention;
Wherein:
1-a first pulse width laser; 2-a second pulse width laser; a 3-polarization coax; 3.1-1 st horizontal polarizer; 3.2-2 nd horizontal polarizer; a 4-polarization state 90 degree rotator; 5-polarization detector.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects solved by the invention more clear, the invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The invention provides a pulse width switching coaxial co-polarized laser which is used for respectively processing laser beams emitted by two paths of lasers with different pulse widths at different moments, ensuring that the processed two paths of laser beams are output coaxially and in the same polarization state, and further being capable of being applied to the same subsequent amplifying optical path system, testing system or other specific applications.
Referring to fig. 1, a pulse width switched coaxial co-polarized laser includes: a first pulse width laser 1, a second pulse width laser 2, a polarization coaxial 3 and a movable polarization state 90 degree rotator 4; the following details the four devices:
Pulse width laser
Two pulse width lasers are configured, namely a first pulse width laser 1 and a second pulse width laser 2, wherein the first pulse width laser 1 outputs horizontally polarized light, and the second pulse width laser 2 outputs vertically polarized light.
(II) polarization coaxializer
The polarization coaxializer 3 is arranged on the output light path of the first pulse width laser 1 and the output light path of the second pulse width laser 2, and is used for realizing the coaxialization function of the horizontal polarized light output by the first pulse width laser and the vertical polarized light output by the second pulse width laser. For the convenience of understanding the present invention, a specific structural form of the polarization coaxial device is described below:
The polarization coaxial device can adopt the following structural forms: the polarization coaxial 3 includes a1 st horizontal polarizer 3.1 and a2 nd horizontal polarizer 3.2;
Setting a1 st horizontal polaroid 3.1 according to the Brewster angle on an output light path of the first pulse width laser 1, so that the horizontal polarized light output by the first pulse width laser 1 is completely transmitted through the 1 st horizontal polaroid 3.1 and enters a main light path;
on the output light path of the second pulse width laser 2, setting a2 nd horizontal polaroid 3.2 according to the Brewster angle, and reflecting the vertical polarized light output by the second pulse width laser 2 to a1 st horizontal polaroid 3.1 after the reflection of the 2 nd horizontal polaroid 3.2; and then reflected to the main light path by the reflection of the 1 st horizontal polarizer 3.1.
Whereby the effect of coaxial polarized light output by the first pulse width laser 1 and polarized light output by the second pulse width laser 2 is achieved.
(III) 90-degree rotator with movable polarization state
The movable polarization state 90 degree rotator 4 is mainly used for performing polarization state conversion on the vertically polarized light output by the second pulse width laser 2, and converting the vertically polarized light into horizontally polarized light so as to make the polarization state of the horizontally polarized light output by the first pulse width laser identical to that of the horizontally polarized light.
Thus, a movable polarization state 90 degree rotator 4 is arranged on the output light path of the polarization coaxially 3. When switching to the first pulse width laser, the movable polarization state 90-degree rotator 4 leaves the main light path and does not process polarized light output by the first pulse width laser; when switching to the second pulse width laser, the movable polarization state 90 degree rotator 4 moves into the main optical path to convert the vertically polarized light output by the second pulse width laser into horizontally polarized light.
Based on the above concept, the movable polarization state 90 degree rotator 4 includes a rotator driving mechanism and a polarization state 90 degree rotator; the driving mechanism is used for driving the polarization state 90-degree rotator to enter or leave the main light path. The polarization state 90-degree rotator is used for converting the polarization state of vertically polarized light into horizontally polarized light, and the polarization state 90-degree rotator can be realized by a half wave plate or a 90-degree rotor.
The rotator driving mechanism is any mechanism capable of driving the polarization state 90-degree rotator to move, and the specific form of the rotator driving mechanism is not limited by the invention, and the rotator driving mechanism can be realized by adopting a motor in general.
In addition, in order to realize the detection of the position of the polarization state 90-degree rotator, thereby judging whether the polarization state 90-degree rotator is positioned on a main light path or not, a limit switch can be arranged; the limit switch is arranged near the main light path, and is disconnected when the polarization state 90-degree rotator enters the main light path; when the polarization state 90-degree rotator leaves the main light path, the limit switch is triggered to be conducted.
The output end of the main light path can be also provided with a polarization detector for detecting the polarization state of the finally obtained laser beam, and the detected laser beams are all in a horizontal polarization state after being processed by the laser.
For the pulse width switching coaxial co-polarized laser provided by the invention, a controller can be further designed for realizing an automatic control function; the controller is electrically connected with the first pulse width laser 1, the second pulse width laser 2, the rotator driving mechanism and the limit switch respectively.
Based on the pulse width switching coaxial co-polarized laser, the invention also provides a coaxial co-polarized laser output method, which comprises the following steps:
Step 1, when coaxial co-polarized light of light output by a first pulse width laser 1 is required to be obtained, a controller detects whether a polarization state 90-degree rotator is positioned on a main light path, if so, the polarization state 90-degree rotator is driven to leave the main light path, and then step 2 is executed; if not, directly executing the step 2;
step 2, the controller starts the first pulse width laser 1, the first pulse width laser 1 outputs horizontal polarized light, the horizontal polarized light completely transmits through the 1 st horizontal polaroid 3.1 in the polarization coaxial 3 and enters a main light path, and thus a1 st horizontal polarized state laser beam is obtained;
Step 3, when the coaxial co-polarized light of the light output by the second pulse width laser 2 is required to be obtained, the controller detects whether the polarization state 90-degree rotator is positioned on the main light path, and if so, the step 4 is directly executed; if not, driving the polarization state 90-degree rotator to enter a main light path, and then executing the step 4;
Step 4, the controller starts the second pulse width laser 2, the second pulse width laser 2 outputs vertical polarized light, and the vertical polarized light is reflected to the 1 st horizontal polarizer 3.1 after passing through the reflection effect of the 2 nd horizontal polarizer 3.2; then, the laser beam enters a polarization state 90-degree rotator after the reflection effect of a 1 st horizontal polaroid sheet 3.1, and the polarization state 90-degree rotator converts vertical polarized light into horizontal polarized light to obtain a 2 nd horizontal polarized laser beam; the 2 nd horizontal polarization state laser beam and the 1 st horizontal polarization state laser beam are coaxial laser beams with the same polarization state.
The pulse width switching coaxial co-polarized laser and the coaxial co-polarized laser output method provided by the invention have the following advantages:
The coaxial same-polarization laser is switched by the pulse width, so that the first pulse width laser and the second pulse width laser can output coaxial same-polarization laser, and therefore, laser beams output by different pulse width lasers can share the same set of laser amplifier and the test system with the same test parameters, and the cost and the operation complexity of the subsequent amplifier and the test application system are reduced.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which is also intended to be covered by the present invention.
Claims (3)
1. A pulse width switched coaxial co-polarized laser, comprising: the device comprises a first pulse width laser (1), a second pulse width laser (2), a polarization coaxial device (3) and a movable polarization state 90-degree rotator (4);
The first pulse width laser (1) outputs horizontally polarized light, and the second pulse width laser (2) outputs vertically polarized light; the polarization coaxializer (3) is arranged on an output light path of the first pulse width laser (1) and an output light path of the second pulse width laser (2), and the movable polarization state 90-degree rotator (4) is arranged on the output light path of the polarization coaxializer (3);
the polarization coaxial device (3) comprises a 1 st horizontal polarizer (3.1) and a 2 nd horizontal polarizer (3.2);
setting the 1 st horizontal polaroid (3.1) according to the Brewster angle on an output light path of the first pulse width laser (1), so that the horizontal polarized light output by the first pulse width laser (1) is completely transmitted through the 1 st horizontal polaroid (3.1) and enters a main light path;
setting the 2 nd horizontal polaroid (3.2) according to the Brewster angle on an output light path of the second pulse width laser (2), and reflecting vertical polarized light output by the second pulse width laser (2) to the 1 st horizontal polaroid (3.1) after the reflection effect of the 2 nd horizontal polaroid (3.2); then the light is reflected to the main light path after the reflection effect of the 1 st horizontal polaroid (3.1);
The movable polarization state 90-degree rotator (4) comprises a rotator driving mechanism and a polarization state 90-degree rotator; the driving mechanism is used for driving the polarization state 90-degree rotator to enter or leave the main light path;
The rotator driving mechanism comprises a motor; the movable polarization state 90-degree rotator (4) further comprises a limit switch; when the polarization state 90-degree rotator enters the main light path, the limit switch is disconnected; when the polarization state 90-degree rotator leaves the main light path, triggering the limit switch to be conducted;
a coaxial co-polarized laser output method of a pulse width switching coaxial co-polarized laser comprises the following steps:
step 1, when coaxial co-polarized light of light output by a first pulse width laser (1) needs to be obtained, a controller detects whether a polarization state 90-degree rotator is positioned on a main light path, if so, the polarization state 90-degree rotator is driven to leave the main light path, and then step 2 is executed; if not, directly executing the step 2;
Step 2, the controller starts a first pulse width laser (1), the first pulse width laser (1) outputs horizontal polarized light, and the horizontal polarized light completely transmits through a 1 st horizontal polarizer (3.1) in the polarization coaxial device (3) and enters a main light path, so that a 1 st horizontal polarized state laser beam is obtained;
step 3, when coaxial co-polarized light of the light output by the second pulse width laser (2) needs to be obtained, the controller detects whether the polarization state 90-degree rotator is positioned on the main light path, and if so, the step 4 is directly executed; if not, driving the polarization state 90-degree rotator to enter the main light path, and then executing the step 4;
Step 4, the controller starts a second pulse width laser (2), the second pulse width laser (2) outputs vertical polarized light, and the vertical polarized light is reflected to the 1 st horizontal polaroid (3.1) after passing through the reflection effect of the 2 nd horizontal polaroid (3.2); then, the laser beam enters a polarization state 90-degree rotator after the reflection effect of a1 st horizontal polaroid (3.1), and the polarization state 90-degree rotator converts the vertical polarized light into horizontal polarized light to obtain a2 nd horizontal polarized laser beam; the 2 nd horizontal polarization state laser beam and the 1 st horizontal polarization state laser beam are coaxial laser beams with the same polarization state.
2. The pulse width switched co-axial co-polarized laser of claim 1 wherein the polarization state 90 degree rotator is a half wave plate or a 90 degree rotator.
3. A pulse width switched co-axial co-polarized laser as defined in claim 1, further comprising a controller;
The controller is respectively and electrically connected with the first pulse width laser (1), the second pulse width laser (2), the rotator driving mechanism and the limit switch.
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