Orthogonal polarization output electro-optic Q-switched pulse laser and laser processing method

Abstract

The invention provides an orthogonal polarization output electro-optic Q-switched pulse laser and a laser processing method, and relates to the technical field of laser detection, the method comprises a controller and a resonant cavity formed by a reflector and an output mirror; the resonant cavity is internally provided with an electro-optic Q-switched crystal, an electric control photoelectric delayer and a laser gain unit; the controller is electrically connected with the electro-optic Q-switched crystal and the electric control photoelectric delayer respectively; the controller is configured to output a first control signal to the electro-optical Q-switched crystal and output a second control signal to the electric control photoelectric delayer; the controller controls a level combination of the first control signal and the second control signal. According to the orthogonal polarization output electro-optic Q-switched pulse laser and the laser processing method, information loading is achieved by changing the relative position of the laser pulse on the time axis, the controllable orthogonal polarization laser pulse is adopted, the two states of the pulse can be distinguished, encoding in the polarization state dimension can be achieved, and the information capacity is greatly improved.

Description

Technical Field

[0001] This application relates to the field of laser detection technology, and in particular to an orthogonally polarized output electro-optic Q-switched pulse laser and a laser processing method. Background Technology

[0002] Electro-optic Q-switched laser pulses have outstanding advantages such as narrow pulse width, high energy, and high peak power, enabling long-distance laser detection and space information transmission, and playing an important role in inter-satellite communication and deep space communication.

[0003] However, electro-optic Q-switched lasers in related technologies typically output laser pulses with a fixed polarization direction and only one polarization state. That is, the vibration direction of the light vector is determined and does not change, which means that they can only be encoded in the time domain during detection or communication, resulting in a small information capacity. Summary of the Invention

[0004] The purpose of this application is to provide an orthogonally polarized output electro-optic Q-switched pulse laser and a laser processing method. Information loading is achieved by changing the relative position of the laser pulse on the time axis. By using controllable orthogonally polarized laser pulses, the two states of the pulse can be distinguished, and encoding in the polarization state dimension can be realized, which greatly improves the information capacity.

[0005] This application provides an orthogonally polarized output electro-optic Q-switched pulse laser, comprising: The controller comprises a resonant cavity consisting of a reflector and an output mirror; an electro-optic Q-switched crystal, an electrically controlled photoelectric delay unit, and a laser gain unit are disposed within the resonant cavity; the laser gain unit is disposed between the electro-optic Q-switched crystal and the electrically controlled photoelectric delay unit; the controller is electrically connected to both the electro-optic Q-switched crystal and the electrically controlled photoelectric delay unit; the controller is configured to output a first control signal to the electro-optic Q-switched crystal and a second control signal to the electrically controlled photoelectric delay unit; the controller controls the level combination of the first and second control signals to cause the laser to output laser pulses with mutually orthogonal polarization directions.

[0006] Optionally, a quarter-wave plate is disposed between the reflector and the electro-optic Q-switched crystal; a polarizer is disposed between the electro-optic Q-switched crystal and the laser gain unit; the optical axis of the quarter-wave plate forms a 45° angle with the polarization direction of the polarizer.

[0007] Optionally, when the first control signal is high, the electro-optic Q-switched crystal is equivalent to a quarter-wave plate; when the second control signal is high, the electronically controlled opto-retarder is equivalent to a half-wave plate.

[0008] Optionally, when the electro-optic Q-switching crystal is equivalent to a quarter-wave plate and the electrically controlled photoelectric delayer is equivalent to a half-wave plate, the angle between the optical axis direction of the electro-optic Q-switching crystal and the electrically controlled photoelectric delayer and the polarization direction of the polarizer is 45°.

[0009] Optionally, when the first control signal is high, the polarization directions of the first laser and the second laser output by the laser are perpendicular to each other; the first laser is the laser pulse output when the second control signal is low; and the second laser is the laser pulse output when the second control signal is high.

[0010] Optionally, when the first control signal is high and the second control signal is low, the polarization direction of the laser pulse output by the laser is parallel to the reference plane.

[0011] Optionally, when the first control signal is high and the second control signal is high, the polarization direction of the laser pulse output by the laser is perpendicular to the reference plane.

[0012] Optionally, the electro-optic Q-switched crystal and the electrically controlled opto-retarder are KD*P crystals or RTP crystals; the laser gain unit is LD pumped or flash lamp pumped.

[0013] Optionally, the rising edge of the second control signal precedes the rising edge of the first control signal, and the falling edge of the second control signal follows the falling edge of the first control signal.

[0014] This application also provides a laser processing method, including: Determine the target frequency of the output pulsed laser; based on the target frequency, generate and output orthogonally polarized laser pulses with switchable polarization direction by switching the levels of the first control signal and the second control signal.

[0015] This application also provides a computer program product, including a computer program / instructions that, when executed by a processor, implement the steps of any of the laser processing methods described above.

[0016] This application also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the steps of any of the laser processing methods described above.

[0017] This application also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of any of the laser processing methods described above.

[0018] This application provides an orthogonally polarized output electro-optic Q-switched pulsed laser and a laser processing method, comprising: a controller; a resonant cavity composed of a reflector and an output mirror; an electro-optic Q-switched crystal, an electrically controlled photoelectric delay unit, and a laser gain unit disposed within the resonant cavity; the laser gain unit being disposed between the electro-optic Q-switched crystal and the electrically controlled photoelectric delay unit; the controller being electrically connected to both the electro-optic Q-switched crystal and the electrically controlled photoelectric delay unit; the controller being configured to output a first control signal to the electro-optic Q-switched crystal and a second control signal to the electrically controlled photoelectric delay unit; the controller controlling the level combination of the first and second control signals to cause the laser to output laser pulses with mutually orthogonal polarization directions. Thus, by changing the relative position of the laser pulses on the time axis, information loading is achieved. Using controllable orthogonally polarized laser pulses, the two states of the pulse can be distinguished, enabling encoding in the polarization state dimension, thereby significantly increasing the information capacity. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of the orthogonally polarized output electro-optic Q-switched pulsed laser provided in this application; Figure 2 This is a schematic diagram of the control signals and laser pulses output by the controller provided in this application; Figure 3 This is a flowchart illustrating the laser processing method provided in this application; Figure 4 This is a schematic diagram of the structure of the electronic device provided in this application. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0022] The terms "first," "second," etc., used in this application's specification are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class, without limiting the number of objects; for example, a first object can be one or more. Furthermore, in the specification, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects have an "or" relationship.

[0023] The following provides a detailed explanation of the technical terms used in the embodiments of this application: Electro-optic Q-switching crystal: This is the most critical active control element in the entire electro-optic Q-switched laser, serving as the ultra-high-speed optical switch for the laser resonator. Its core function is to rapidly and precisely control the opening and closing of the laser resonator through an externally applied voltage, thereby generating giant pulse lasers with high peak power. The electro-optic Q-switching crystal operates in two core stages: 1. Energy storage stage (applying voltage) Operation: A specific voltage (typically a quarter-wavelength voltage) is applied to the electro-optic Q-switched crystal. Effect: Based on the electro-optic effect, the crystal acts as a "switchable quarter-wave plate." Linearly polarized light emitted from the laser gain unit, capable of passing through the polarizer, undergoes a polarization change (e.g., from linear to circular polarization) after passing through the voltage-applied electro-optic Q-switched crystal. This light, reflected back by a mirror, passes through the crystal again, its polarization direction rotated by 90° (e.g., from parallel to the plane of the paper to perpendicular to it). Because the polarization direction has changed by 90°, the light cannot pass through the polarizer again and is reflected out of the resonant cavity. Result: The "gate" of the resonant cavity is closed, preventing laser oscillation. The laser gain unit is continuously pumped, and energy accumulates, much like the water level in a reservoir is raised higher and higher, achieving a massive energy storage through "population inversion."

[0024] Phase Two: Launch Phase (Voltage Removal) Operation: When the energy is stored to its maximum value, the voltage applied to the electro-optic Q-switched crystal is instantaneously removed. Effect: After the voltage is removed, the crystal returns to a "transparent" state and no longer changes the polarization state of the light. At this moment, the resonant cavity loss is instantly reduced to a minimum. The weak light signal initially generated by spontaneous emission within the cavity can now pass through unimpeded, stimulating all the stored energy to be emitted in a very short time, like an avalanche. Result: The "gate" of the resonant cavity is instantly opened, and all the stored energy is extracted in a "floodgate" manner within tens of nanoseconds, forming a giant pulse laser with extremely high energy and an extremely narrow pulse width.

[0025] Laser gain unit: Its core function is to provide energy and amplify the optical signal through stimulated emission. It is the energy source and light-emitting core of the entire laser. Specifically, its function can be divided into the following two key stages: 1. Energy storage stage (when signal A is low): During this stage, since the resonant cavity is in a closed state (light cannot oscillate within the cavity), the laser gain unit, under the excitation of an external pump source (such as a flash lamp or laser diode), activates the internal particles (such as Nd2+) of the laser. 3+ Ions are excited to a high energy level. Unable to form laser oscillations, these high-energy-level particles accumulate, creating a "population inversion" state. This process is like storing energy in a reservoir, rather than releasing it immediately.

[0026] 2. Laser generation and amplification stage (when signal A is high): When a high voltage (signal A is high) is applied to the electro-optic Q-switched crystal, the resonant cavity switches open instantaneously, and the Q value increases sharply. At this moment, an extremely weak light signal (from spontaneous emission) begins to travel back and forth through the laser gain unit. These light signals trigger stimulated emission of a large number of high-energy particles stored in the gain unit. This process is like toppling the first domino, triggering an avalanche effect, and the light signal is amplified dramatically each time it passes through the gain unit. Ultimately, in a very short time, all the stored energy is extracted, forming a powerful Q-switched giant pulse laser.

[0027] Electrically controlled photoelectric delay device: After the Q-switching pulse is generated, its polarization direction is actively controlled by an electrical signal, thereby realizing the on-demand output of two orthogonal polarization states.

[0028] Operating mode 1: Output parallel polarization pulse (signal B is low level) The state of the electrically controlled photoelectric delayer: inactive (transparent state). Optical path process: When the electro-optic Q-switched crystal is active (signal A is high), laser oscillation is established within the resonant cavity, generating a giant pulse. The polarization direction of this light oscillating within the cavity is locked parallel to the plane of the paper (able to pass through a polarizer). When the light pulse reaches the electrically controlled photoelectric delayer, since it is inactive, it has no effect on the polarization state of the light. The light pulse directly reaches the output mirror; part is reflected back into the cavity to continue oscillating, and the other part is output. Final result: The polarization direction of the output pulse is parallel to the plane of the paper.

[0029] Operating mode 2: Output vertical polarization pulse (signal B is high level) The state of the electrically controlled photoelectric delayer: Operating, equivalent to a half-wave plate, with its optical axis forming a 45° angle with the polarization direction of the polarizer. Optical path process: As mentioned earlier, the laser oscillation established within the resonant cavity is still parallel to the plane of the paper. When this light pulse first passes through the operating electrically controlled photoelectric delayer, its polarization direction is rotated by 90°, becoming perpendicular to the plane of the paper. This light pulse, perpendicular to the plane of the paper, reaches the output mirror; part is output, and the other part is reflected. The reflected light passes through the electrically controlled photoelectric delayer a second time, and its polarization direction is rotated by 90° again, changing from "perpendicular to the plane of the paper" back to "parallel to the plane of the paper." This light, now parallel, can smoothly pass through the polarizer and return to the resonant cavity, maintaining oscillation. Final result: The polarization direction of the output pulse is perpendicular to the plane of the paper.

[0030] The working principle of the electro-optic Q-switched laser in related technologies is as follows: Before the electro-optic Q-switch is turned on, the resonant cavity is in an energy storage state. The loss in the entire resonant cavity is very large, the quality factor Q is very low, and resonance cannot be formed, so laser cannot be output. The laser gain unit accumulates in the upper energy level under the action of the pump source. When the electro-optic Q-switch is turned on, due to the very fast opening speed of the electro-optic Q-switch, the loss in the resonant cavity drops sharply in a very short time, the Q value suddenly increases, and laser oscillation is rapidly generated in the resonant cavity. The particles in the upper energy level in the gain unit quickly jump to the lower energy level, and the number of photons in the resonant cavity surges, forming a narrow pulse width high-energy laser pulse that is output from the output mirror. In this way, the laser pulse energy can usually reach the Joule level, the pulse width can be tens of nanoseconds, and the peak power can reach the megawatt level, providing important support for long-distance spatial optical information transmission.

[0031] To address the aforementioned technical problems of electro-optic Q-switched lasers in related technologies, this application provides an orthogonally polarized output electro-optic Q-switched pulsed laser. Information loading is achieved by changing the relative position of the laser pulses on the time axis. Using controllable orthogonally polarized laser pulses, the two states of the pulse can be distinguished, enabling encoding in the polarization dimension and significantly increasing information capacity. Since the two directions of orthogonally polarized lasers are perpendicular to each other and easily distinguishable, this technology can be applied to fields such as laser detection and space laser communication, forming polarization encoding and enhancing information carrying capacity.

[0032] The orthogonal polarization output electro-optic Q-switched pulsed laser provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0033] For example, the orthogonally polarized output electro-optic Q-switched pulse laser provided in this application includes: The controller comprises a resonant cavity consisting of a reflector and an output mirror; an electro-optic Q-switched crystal, an electrically controlled photoelectric delay unit, and a laser gain unit are disposed within the resonant cavity; the laser gain unit is disposed between the electro-optic Q-switched crystal and the electrically controlled photoelectric delay unit; the controller is electrically connected to both the electro-optic Q-switched crystal and the electrically controlled photoelectric delay unit; the controller is configured to output a first control signal to the electro-optic Q-switched crystal and a second control signal to the electrically controlled photoelectric delay unit; the controller controls the level combination of the first and second control signals to cause the laser to output laser pulses with mutually orthogonal polarization directions.

[0034] For example, such as Figure 1 As shown, this is an orthogonally polarized output electro-optic Q-switched pulsed laser provided in an embodiment of this application. The laser includes: The system comprises a total internal reflection mirror 1, a quarter-wave plate 2, an electro-optic Q-switched crystal 3, a polarizer 4, a laser gain unit 5, an electrically controlled photoelectric delay unit 6, and an output mirror 7. The reflector 1 and the output mirror 7 constitute the resonant cavity of the laser. The electro-optic Q-switched crystal 3 and the electrically controlled photoelectric delay unit 6 work collaboratively under the control of a controller 8. The controller 8 outputs two signals, including signal A (the aforementioned first control signal) and signal B (the aforementioned second control signal), which are distributed to the electro-optic Q-switched crystal 3 and the electrically controlled photoelectric delay unit 6. Figure 2 As shown, the signal waveform of signal A is as follows: Figure 2 As shown in Figure 9, the signal waveform of signal B is as follows: Figure 2 As shown in Figure 10.

[0035] For example, a quarter-wave plate is disposed between the reflector and the electro-optic Q-switched crystal; a polarizer is disposed between the electro-optic Q-switched crystal and the laser gain unit; the optical axis of the quarter-wave plate forms a 45° angle with the polarization direction of the polarizer. When the first control signal is high, the electro-optic Q-switched crystal is equivalent to a quarter-wave plate; when the second control signal is high, the electrically controlled photoelectric delay unit is equivalent to a half-wave plate. When the electro-optic Q-switched crystal is equivalent to a quarter-wave plate and the electrically controlled photoelectric delay unit is equivalent to a half-wave plate, the angle between the optical axis directions of the electro-optic Q-switched crystal and the electrically controlled photoelectric delay unit and the polarization direction of the polarizer is 45°.

[0036] For example, when the first control signal is high, the polarization directions of the first laser and the second laser output by the laser are perpendicular to each other; the first laser is the laser pulse output when the second control signal is low; and the second laser is the laser pulse output when the second control signal is high.

[0037] For example, when the first control signal is high and the second control signal is low, the polarization direction of the laser pulse output by the laser is parallel to the reference plane. When the first control signal is high and the second control signal is high, the polarization direction of the laser pulse output by the laser is perpendicular to the reference plane.

[0038] For example, when both signals A and B are low, the light radiation generated by the laser gain unit 5 forms linearly polarized light through the polarizer 4. The vibration direction of the light vector is parallel to the plane of the paper. Since signal A is low, the electro-optic Q-switching crystal is not working and does not affect the polarization state of the light. The angle between the optical axis of the quarter-wave plate 2 and the polarization direction of the polarizer 4 is 45°. After passing through the quarter-wave plate 2, the linearly polarized light is converted into circularly polarized light. After being reflected by the total internal reflection mirror 1, it is still circularly polarized light, but the rotation of the light vector... The direction is opposite to that of the incident circularly polarized light. For example, if the circularly polarized light incident on the total reflection mirror 1 is left-handed circularly polarized light, it will become right-handed circularly polarized light after being reflected by the total reflection mirror 1. After passing through the quarter-wave plate 2, it will form linearly polarized light. However, at this time, the direction of the light vector vibration of the linearly polarized light is perpendicular to the plane of the paper (i.e., the reference plane mentioned above). After passing through the electro-optic Q-switched crystal 3, it cannot pass through the polarizer 4 and will be reflected out of the resonant cavity by the polarizer. Therefore, the light radiation cannot oscillate in the resonant cavity and cannot output laser light. The laser gain unit 5 is in the energy storage state. When a high level is applied to the electro-optic Q-switched crystal 3, it is equivalent to a quarter-wave plate, and its optical axis is aligned with that of the quarter-wave plate 2. Together, they form a half-wave plate. When the linearly polarized light passing through the polarizer 4 passes through the electro-optic Q-switched crystal 3 and the quarter-wave plate 2, it remains pre-polarized, but the vibration direction of the light vector rotates by 90°, becoming perpendicular to the paper. After being reflected by the mirror 1, it passes through the quarter-wave plate 2 and the electro-optic Q-switched crystal 3 again, and the vibration direction of the light vector rotates by 90° again, becoming parallel to the paper. It can then pass smoothly through the polarizer and through the laser gain unit 5, where the light radiation is amplified. At this time, if signal B is low, the electronically controlled photoelectric delay unit 6 does not affect the polarization state of the light radiation, and it can directly reach the output mirror 7. After being reflected by the output mirror, it returns to the laser gain unit 5, thus quickly establishing a laser beam in the resonant cavity. The oscillation forms a high-energy Q-switched laser pulse, which is output from the output mirror 7. At this time, the polarization state of the output laser pulse is parallel to the plane of the paper. When signal A is high and signal B is also high, the electrically controlled photoelectric delay unit 6 is equivalent to a half-wave plate, and the angle between the optical axis and the polarization direction of the polarizer 4 is 45°. After the light output from the laser gain unit 5 passes through the electrically controlled photoelectric delay unit 6, the vibration direction of the light vector rotates by 90° and becomes perpendicular to the plane of the paper. After passing through the output mirror 7, part of it will be reflected back. After passing through the electrically controlled photoelectric delay unit 6 again, the vibration direction of the light vector rotates by 90° again and becomes parallel to the plane of the paper. After passing through the laser gain unit 5, it can pass through the polarizer 4, thereby establishing an oscillation between the reflecting mirror 1 and the output mirror 7, forming a high-energy Q-switched laser pulse, which is output from the output mirror 7. However, the polarization state of the output laser pulse is perpendicular to the plane of the paper.

[0039] For example, based on the above, when the Q-switched pulse signal in A arrives, if B is at a low level, the direction of the light vector vibration of the output Q-switched laser pulse is parallel to the plane of the paper; if B is at a high level, the direction of the light vector vibration of the output Q-switched laser pulse is perpendicular to the plane of the paper, thus forming an orthogonally polarized laser pulse output. By controlling the pulses in A and B, an orthogonally polarized Q-switched laser pulse O can be obtained. The waveform of this laser pulse O is as follows: Figure 2 As shown in Figure 11.

[0040] For example, the rising edge of the second control signal precedes the rising edge of the first control signal, and the falling edge of the second control signal follows the falling edge of the first control signal.

[0041] For example, such as Figure 2 As shown, signal B must arrive before signal A and end after signal A. That is, for the pulse signal of signal A to correspond to the high level of signal B, signal B needs to be at a high level before signal A arrives, and signal B returns to a low level after the pulse of signal A ends. Similarly, for the pulse signal of signal A to correspond to the low level of signal B, signal B needs to be at a low level before signal A arrives, and signal B can only be at a high level after the pulse of signal A ends.

[0042] In one possible implementation, the electro-optic Q-switched crystal and the electrically controlled opto-retarder are KD*P crystals or RTP crystals; the laser gain unit is LD pumped or flash lamp pumped.

[0043] The laser processing method provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0044] like Figure 3 As shown in the embodiment of this application, a laser processing method is provided, which may include the following steps 301 and 302: Step 301: Determine the target frequency of the output pulsed laser.

[0045] Step 302: Based on the target frequency, generate and output orthogonally polarized laser pulses with switchable polarization direction by switching the levels of the first control signal and the second control signal.

[0046] The laser processing method provided in this application embodiment loads information by changing the relative position of the laser pulse on the time axis. It uses controllable orthogonally polarized laser pulses, which can distinguish the two states of the pulse and realize encoding in the polarization state dimension, thereby greatly improving the information capacity.

[0047] It should be noted that, in the embodiments of this application, the laser processing methods shown in the accompanying drawings are all illustrated by way of example with reference to one of the accompanying drawings in the embodiments of this application. In specific implementation, the laser processing methods shown in the accompanying drawings can also be implemented in conjunction with any other accompanying drawings shown in the above embodiments, which will not be elaborated here.

[0048] Figure 4 An example is a schematic diagram of the physical structure of an electronic device, such as... Figure 4 As shown, the electronic device may include a processor 410, a communication interface 420, a memory 430, and a communication bus 440. The processor 410, communication interface 420, and memory 430 communicate with each other via the communication bus 440. The processor 410 can call logic instructions in the memory 430 to execute a laser processing method. This method includes: determining the target frequency of the output pulsed laser; and, based on the target frequency, generating and outputting orthogonally polarized laser pulses with switchable polarization directions by switching the levels of a first control signal and a second control signal. Thus, information loading is achieved by changing the relative position of the laser pulses on the time axis. By using controllable orthogonally polarized laser pulses, the two states of the pulse can be distinguished, enabling encoding in the polarization state dimension, thereby significantly increasing the information capacity.

[0049] Furthermore, the logical instructions in the aforementioned memory 430 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0050] On the other hand, this application also provides a computer program product, which includes a computer program stored on a computer-readable storage medium. The computer program includes program instructions, and when the program instructions are executed by a computer, the computer can execute the laser processing method provided by the above-described methods. The method includes: determining the target frequency of the output pulsed laser; and generating and outputting orthogonally polarized laser pulses with switchable polarization directions by switching the levels of a first control signal and a second control signal based on the target frequency. Thus, information loading is achieved by changing the relative position of the laser pulses on the time axis. By using controllable orthogonally polarized laser pulses, the two states of the pulse can be distinguished, enabling encoding in the polarization state dimension, thereby significantly increasing the information capacity.

[0051] Furthermore, this application also provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, performs the laser processing methods described above. The method includes: determining a target frequency for output pulsed laser light; and, based on the target frequency, generating and outputting orthogonally polarized laser pulses with switchable polarization directions by switching the levels of a first control signal and a second control signal. Thus, information loading is achieved by changing the relative position of the laser pulses on the time axis. By employing controllable orthogonally polarized laser pulses, the two states of the pulse can be distinguished, enabling encoding in the polarization state dimension, thereby significantly increasing the information capacity.

[0052] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0053] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. An orthogonally polarized output electro-optic Q-switched pulsed laser, characterized in that, include: The controller comprises a resonant cavity consisting of a reflector and an output mirror; the resonant cavity contains an electro-optic Q-switched crystal, an electrically controlled photoelectric delay unit, and a laser gain unit; the laser gain unit is disposed between the electro-optic Q-switched crystal and the electrically controlled photoelectric delay unit; the controller is electrically connected to both the electro-optic Q-switched crystal and the electrically controlled photoelectric delay unit. The controller is configured to output a first control signal to the electro-optic Q-switched crystal and a second control signal to the electronically controlled opto-retarder; The controller controls the level combination of the first control signal and the second control signal to make the laser output laser pulses with mutually orthogonal polarization directions.

2. The laser according to claim 1, characterized in that, A quarter-wave plate is disposed between the reflector and the electro-optic Q-switched crystal; a polarizer is disposed between the electro-optic Q-switched crystal and the laser gain unit; the optical axis of the quarter-wave plate forms a 45° angle with the polarization direction of the polarizer.

3. The laser according to claim 2, characterized in that, When the first control signal is high, the electro-optic Q-switched crystal is equivalent to a 1 / 4 wave plate; when the second control signal is high, the electronically controlled opto-retarder is equivalent to a 1 / 2 wave plate.

4. The laser according to claim 3, characterized in that, When the electro-optic Q-switched crystal is equivalent to a quarter-wave plate and the electrically controlled photoelectric delayer is equivalent to a half-wave plate, the angle between the optical axis of the electro-optic Q-switched crystal and the electrically controlled photoelectric delayer and the polarization direction of the polarizer is 45°.

5. The laser according to claim 2, characterized in that, When the first control signal is high, the polarization directions of the first laser and the second laser output by the laser are perpendicular to each other; the first laser is the laser pulse output when the second control signal is low; the second laser is the laser pulse output when the second control signal is high.

6. The laser according to claim 2, characterized in that, When the first control signal is high and the second control signal is low, the polarization direction of the laser pulse output by the laser is parallel to the reference plane.

7. The laser according to claim 2, characterized in that, When the first control signal is high and the second control signal is high, the polarization direction of the laser pulse output by the laser is perpendicular to the reference plane.

8. The laser according to claim 2, characterized in that, The electro-optic Q-switched crystal and the electronically controlled optoelectronic delay unit are KD*P crystals or RTP crystals; the laser gain unit is LD pumped or flash lamp pumped.

9. The laser according to any one of claims 2 to 8, characterized in that, The rising edge of the second control signal precedes the rising edge of the first control signal, and the falling edge of the second control signal follows the falling edge of the first control signal.

10. A laser processing method, characterized in that, Applied to the orthogonally polarized output electro-optic Q-switched pulsed laser as described in any one of claims 1 to 9; The method includes: Determine the target frequency of the output pulsed laser; Based on the target frequency, by switching the levels of the first control signal and the second control signal, an orthogonally polarized laser pulse with switchable polarization direction is generated and output.

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