Intelligent adjusting device and method for Er-doped solid-state laser

Abstract

This invention provides an intelligent adjustment device and method for an Er-doped solid-state laser, comprising a four-mirror cavity laser resonator consisting of a pump source, a collimating mirror, a focusing mirror, an input end mirror, an Er-doped laser crystal, an end mirror, an output coupling mirror, and a high-reflectivity mirror; and an automatic control system consisting of a PC information processing module, a visible light probe detection module, a feedback control module including a cavity mirror control rail and an angle controller, and an infrared optical power meter. The visible light probe detects the intensity change of the upconversion light from the Er-doped laser crystal in real time, which is verified by the infrared optical power meter. The PC module controls the feedback module to adjust the cavity mirror distance and angle to achieve closed-loop control. This invention utilizes optical characteristics to replace detection and intelligent closed-loop control, solving the problems of high cost and slow response of traditional 3-micron lasers, achieving low-cost, high-response automated cavity mirror control, and possessing advantages such as cost savings, fast response, and strong fault tolerance.

Description

Technical Field

[0001] This invention relates to the field of Er-doped solid-state laser control technology for emitting wavelengths of 1.6 micrometers and 3 micrometers, specifically to an intelligent adjustment device and method for Er-doped solid-state lasers. Background Technology

[0002] Er 3+ Erbium-doped solid-state lasers can effectively emit laser light in the 1.6-micron (low doping ~ 0.2%) and 3-micron (high doping ~ 15%) wavelength ranges, which have significant application value in fields such as lidar, optical communication, medical surgery (e.g., soft tissue cutting, dental treatment), precision material processing (micropore fabrication of polymer materials), gas sensing (e.g., methane detection), and bioimaging. This wavelength range combines high tissue absorption efficiency with low thermal damage characteristics, making it particularly suitable for scenarios with extremely high precision and safety requirements. However, the practical application of erbium-doped lasers, especially in the 3-micron band, has long faced two major technical bottlenecks:

[0003] Optical detection devices are expensive: the stability control of traditional 3-micron lasers relies on infrared power meters or spectrometers that directly monitor the laser output. However, detectors suitable for the mid-infrared band (such as mercury cadmium telluride detectors) are expensive and have high maintenance costs due to the complexity of material preparation and the need for cryogenic cooling, making them difficult to popularize, especially in small-scale industrial or medical equipment.

[0004] Insufficient closed-loop control response speed: Existing systems mostly use infrared power meters as feedback signal sources, but their thermal sensing principle results in response times typically in the millisecond range, making it difficult to capture instantaneous power fluctuations caused by laser cavity detuning in real time. When ambient temperature changes or mechanical vibrations cause the cavity mirror to shift, the system cannot adjust quickly, easily leading to laser output interruptions and requiring frequent manual intervention, severely impacting continuous operation efficiency. Summary of the Invention

[0005] To address the aforementioned technical shortcomings, the purpose of this invention is to provide an intelligent adjustment device and method for Er-doped solid-state lasers, achieving low-cost, high-response automated cavity mirror control.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] An intelligent modulation device for an Er-doped solid-state laser includes:

[0008] Pump source, used to provide pump light;

[0009] Collimating lenses are used to convert diverging pump light into parallel light;

[0010] A focusing lens, located on the side of the collimating lens away from the pump source, is used to focus the pump light;

[0011] The input end mirror is located on the side of the focusing mirror away from the collimating mirror, and is used to transmit pump light and reflect laser light;

[0012] An Er-doped laser crystal is placed on the side of the input mirror away from the focusing mirror, and emits laser light through population inversion.

[0013] The end mirror, located on one side of the input end mirror in the Er-doped laser crystal, is used to reflect the laser and filter out excess pump light;

[0014] The output coupling mirror, positioned facing the input mirror, is used to output laser light;

[0015] A high-reflectivity mirror, positioned towards the end mirror, is used to reflect laser light;

[0016] The PC information processing module enables the control of the entire device as well as the reception and processing of data.

[0017] The detection module, located on one side of the Er-doped laser crystal, is used to detect the change in light intensity when light is emitted and when no light is emitted, and transmits the data to the PC information processing module.

[0018] The feedback control module is used to adjust the distance between the high-reflectivity mirror and the end mirror until the detection module detects the laser signal;

[0019] An infrared power meter is installed on one side of the output coupling mirror to check whether light is emitted;

[0020] The feedback control module, detection module, infrared power meter, and PC information processing module are electrically connected; the input end mirror, end mirror, output coupling mirror, and high reflectivity mirror form a four-mirror cavity laser resonator; the PC information processing module, detection module, feedback control module, and power meter constitute an automatic control system.

[0021] Preferably, the feedback control module includes a cavity mirror control rail and a cavity mirror angle controller; a high-reflectivity mirror is mounted on the cavity mirror control rail, which is used to adjust the distance between the high-reflectivity mirror and the end mirror; a cavity mirror angle controller is mounted on the cavity mirror control rail, which is used to control the horizontal and vertical angles of the high-reflectivity mirror to achieve light output; the cavity mirror control rail, the cavity mirror angle controller, and the PC information processing module are electrically connected to realize cavity shape control after laser extinction to find the light source.

[0022] Preferably, the detection module is a visible light probe; the PC information processing module is a personal computer used to analyze whether the intensity change information provided by the visible light probe exceeds the threshold, causing the 1.6-micron and 3-micron lasers to disappear or be generated.

[0023] Preferably, the endoscope control rail and endoscope angle controller are driven by a stepper motor or piezoelectric ceramic to achieve high-precision crystal angle adjustment.

[0024] An intelligent modulation method for an Er-doped solid-state laser includes the following steps:

[0025] S1. Establish the basic optical path;

[0026] S2. Start the pump source, and the Er-doped laser crystal emits bright upconversion yellow-green light;

[0027] S3. Turn on the infrared power meter to confirm the power meter reading in the absence of light.

[0028] S4. Turn on the visible light probe, detect the upconversion light, and record its changes;

[0029] S5. Open your personal computer and run the built-in light-finding program, continuously adjusting the end lens angle and position;

[0030] S6. The intensity of the upconversion light in the Er-doped laser crystal is significantly reduced, and the visible light probe sends the detection data to the personal computer.

[0031] S7. The personal computer immediately stops the operation of the feedback control module and checks the power meter reading. If no light is emitted and the visible light probe does not indicate that the upconversion light intensity has increased, it enters the fine-tuning mode.

[0032] S8. Slowly adjust the laser resonator to match the slower response speed of the power meter until the emitted light enters standby mode or the visible light probe detects an increase in the intensity of the upconversion light, then return to step S5.

[0033] Preferably, during the laser resonator angle adjustment process, the upconversion light intensity is analyzed quickly in real time by a visible light probe to improve efficiency and achieve laser output control.

[0034] Preferably, the initial upconversion light intensity and the initial light intensity measured by the infrared power meter are used as a reference to determine whether there is light or not.

[0035] Preferably, the infrared power meter operates based on thermal sensing; the visible light probe responds between 500-600nm wavelength and is a probe that detects the upconversion of light in real time; the visible light probe only needs to transmit changes in light intensity, and can be used either a camera that transmits images to a personal computer or a probe that detects light intensity; after the laser extinction is detected, the end mirror is automatically searched for light through the control of the personal computer; the personal computer realizes automatic adjustment of laser control and light emission detection.

[0036] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0037] Cost savings: By avoiding expensive mid-infrared detectors and utilizing mature and inexpensive visible light detection devices, the system hardware investment is significantly reduced. Improved response speed: The response time of the visible light probe can reach the microsecond level, which is three orders of magnitude faster than traditional infrared power meters, ensuring real-time adjustment of the endoscope and avoiding processing errors or surgical risks caused by laser output interruption.

[0038] Enhanced fault tolerance: The "dual-signal cross-validation" mechanism (visible light intensity jump and infrared power threshold) reduces the probability of misjudgment. Even if the infrared power meter fails to provide timely feedback due to response delay, the system can still trigger the adjustment program in advance through changes in fluorescence intensity, ensuring stability.

[0039] By deeply integrating "optical property replacement detection" and "intelligent closed-loop control", a reliable, low-cost automated solution is provided for high-precision laser applications, breaking through the cost and performance limitations of 3-micron lasers. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the structure of the present invention.

[0041] Figure 2 This is a schematic diagram of the present invention.

[0042] Figure 3 This refers to the luminescence state of the crystal before it emits 3 micrometers of light, as described in this invention.

[0043] Figure 4 This is the luminescence state of the crystal when emitting 3-micron light according to the present invention.

[0044] Figure 5 This is a schematic diagram of the 1.6-micron laser of the present invention.

[0045] Figure 6 This refers to the luminescence state of the crystal before it emits 1.6 micrometer light, as described in this invention.

[0046] Figure 7 This is the luminescence state of the crystal when emitting 1.6 micrometer light according to the present invention.

[0047] Figure 8 This refers to the luminescence state of the crystal when the two mirror cavities of the present invention do not emit 3 micrometers of light.

[0048] Figure 9 This describes the luminescence state of the crystal when 3-micrometer light is emitted from the two mirror cavities of this invention.

[0049] Figure 10 This is a schematic diagram of the 3-micron dual-cavity laser of the present invention.

[0050] Figure 11 This is a schematic diagram of the endoscopic angle controller in this invention.

[0051] in:

[0052] 1-1 Pump source; 1-2 Collimating mirror; 1-3 Focusing mirror; 1-4 Input end mirror; 1-5 Er-doped laser crystal; 1-6 End mirror; 1-7 Output coupling mirror; 1-8 High-reflectivity mirror; 2-1 Personal computer; 2-2 Visible light probe; 2-3 Cavity mirror control rail; 2-4 Cavity mirror angle controller; 2-5 Infrared power meter. Detailed Implementation

[0053] The following is in conjunction with the appendix Figures 1 to 11 The present invention will be further described below.

[0054] The core principle is based on erbium doping (Er) 3+ The multi-level transition characteristics of the crystal, by optimizing the pump excitation path and the competition between radiative / non-radiative transitions between energy levels, enable the coordinated control of 3-micron laser output and upconversion fluorescence. The specific principle is explained below, referring to the energy level structure of Er ions in the attached figure:

[0055] 1. Energy level structure and pump path design

[0056] Pump excitation: A 976nm laser was used as the pump source to excite Er. 3+ Ions from ground state energy level Excited to intermediate energy level This wavelength matches Er 3+ The absorption peaks of ions ensure efficient excitation.

[0057] Radiative transition: excited state Er 3+ Ions release energy through the following pathways:

[0058] 3-micron laser generation: It transitions and emits a 2.9μm (approximately 3μm) mid-infrared laser.

[0059] Upconversion fluorescence generation: Some ions transition to higher energy levels (e.g., through energy upconversion (ETU) or excited-state absorption (ESA)) ), and then through Jump, emitting 550nm visible light

[0060] Competitive leap: The transition generates 1.55μm near-infrared light, but the oscillation in this band is suppressed by the resonant cavity design to ensure that the energy is concentrated in the 3μm band.

[0061] Therefore, we established a mathematical model for Er ion luminescence:

[0062] Based on the rate equation theory, a multi-level particle number dynamics model of Er-doped crystal was established to quantify the intensity relationship between 3μm laser and upconversion fluorescence.

[0063] 1. Number rate equation for energy level particles

[0064] Let the particle number density of each energy level be N. i (i = 0-5 corresponds to energy levels: The main dynamic processes are as follows:

[0065] Pump excitation:

[0066]

[0067] Among them W p The pump rate is 976nm. They are respectively The radiative and nonradiative transition rates.

[0068] 3μm laser transition (stimulated emission):

[0069]

[0070] in for Spontaneous emission rate, σ 3μm φ is the stimulated emission cross section, and φ is the photon density within the cavity at 3 μm.

[0071] Upconversion fluorescence transition:

[0072] Cross relaxation

[0073] Energy level excitation

[0074] 2. Negative correlation between upconversion fluorescence and laser output

[0075] When the laser cavity is in a resonant state, the 3μm laser is output efficiently. The number of particles in the energy level is rapidly depleted due to stimulated emission, suppressing the intensity of upconversion fluorescence (0.55 μm); conversely, if the cavity mirror is detuned, causing the 3 μm laser to be interrupted, The accumulation of energy level particles enhances the upconversion fluorescence intensity through cross-relaxation. As derived in section 1, the system tends to reach a steady state under continuous pumping. It can be deduced that:

[0076] 3μm laser intensity:

[0077] Here, α is the cross-relaxation coefficient, which reflects the competitive consumption of the 3μm laser during the upconversion process.

[0078] Upconversion fluorescence intensity:

[0079] Therefore, when cavity mistuning leads to I 3μm As I decreases, N2 increases, thus I... 0.55μm The rise verified the physical basis of dual-signal feedback.

[0080] 3. Intelligent control logic

[0081] A dual-signal closed-loop feedback system was established by real-time detection of 0.55μm fluorescence intensity using a visible light probe and verification of 3μm laser output status using an infrared power meter.

[0082] Fluorescence intensity jump: A sudden increase in fluorescence intensity indicates that the 3μm laser output is interrupted, triggering the cavity endoscope adjustment program.

[0083] High-response adjustment: Utilizing the microsecond-level response speed of visible light detection, the displacement stage (adjusting the cavity length) and the angle control motor (adjusting the pitch / horizontal angle of the cavity mirror) are driven to quickly restore the resonant cavity matching state.

[0084] Example 1

[0085] A 3-micron laser device for automatic output based on intelligent control of cavity mirror angle using fluorescence intensity variation is disclosed. The device includes: a 976nm pump source (1-1) for providing pump light; a 100mm collimating mirror (1-2) and a 100mm focusing mirror (1-3) for focusing and collimating the pump light; an input end mirror (1-4) for transmitting the pump light and reflecting the laser; an Er-doped laser crystal (1-5) for emitting laser light through population inversion; an end mirror (1-6) for reflecting the laser and filtering excess pump light; an output coupling mirror (1-7) for outputting the laser; a high-reflectivity mirror (1-8) for reflecting the laser, forming a complete laser cavity; and a personal computer (2-1) equipped with Python for running... The program can communicate bidirectionally with external devices via wired or wireless means through high-speed data interfaces such as RS-232, USB, Bluetooth, LAN, and GPIB to control the entire device and receive and process data. The visible light probe (2-2) has a fast response speed and detects changes in light intensity when light is emitted and not emitted, transmitting the data to a personal computer. The endoscope control rail (2-3) controls the forward and backward movement of the high-reflectivity mirror and adjusts the cavity length. The endoscope angle controller (2-4) is an existing product that controls the horizontal and vertical angles of the high-reflectivity mirror to achieve light emission. The infrared power meter (2-5) has a low response efficiency and only checks whether light is emitted. And achieve the following functions: (1) Real-time judgment of the current laser output status: For Er system lasers, the crystal brightness is observed in real time by the visible light probe (2-2) to detect the luminous intensity of the upconversion light of the crystal. When a significant change in light intensity is detected, information is sent to the personal computer (2-1) in time to warn of the change in output status; (2) Automatic control of laser output: After receiving the message of the change in luminous intensity given by the visible light probe (2-2), the personal computer combines the data of the power meter (2-5) to further judge the current output status. After determining that the laser has no light, the light-finding program is started. The self-made control displacement stage (2-3) and cavity mirror angle controller (2-4) are moved continuously and slowly, so that the computer has enough time to respond to the light intensity change signal sent by the visible light probe and then stop the light-finding program.

[0086] The pump laser beam passes through a set of collimating lenses to ensure high parallelism when incident on the crystal end face. The Er-doped crystal used in the laser cavity emits a bright yellow-green light when pumped.

[0087] The personal computer (1-1) in the automatic control system (1) can be an MSI Titan 17 (RTX4080 Laptop) with Python version 3.12 and Spyder 5.4.3 as the Python runtime platform. The system includes: a detection module for capturing the upconversion light intensity of the Er-doped crystal; a PC information processing module (2-1) for analyzing whether the intensity change information provided by the visible light probe exceeds the threshold causing the 3-micron laser to disappear or reappear; and a feedback control module for fine-tuning the position of the control cavity mirror until the detection module detects the laser again. The adjustment mechanism consists of a cavity mirror control rail (2-3) and a cavity mirror angle controller (2-4), which achieve high-precision crystal angle adjustment through a stepper motor or piezoelectric ceramic drive. After the control program emits light, it is in standby or monitoring state. In monitoring state, it only detects the infrared power meter. When the power meter power is found to be too low, it wakes up the light-finding program.

[0088] A method for adjusting the optical path based on the intensity jump of upconversion light in an Er crystal includes the following steps:

[0089] Establish the basic optical path;

[0090] 1. When the pump source is turned on, the Er crystal emits bright upconversion yellow-green light;

[0091] 2. Turn on the infrared power meter to confirm the power meter reading in the absence of light;

[0092] 3. Turn on the visible light probe, detect the upconversion light, and record its changes;

[0093] 4. Open your personal computer and run the light-finding program, continuously adjusting the end lens angle and position;

[0094] 5. The intensity of upconversion light in Er-doped crystals is significantly reduced, and the visible light probe sends the detection data to a personal computer.

[0095] 6. The personal computer immediately stops the motor and checks the power meter reading. If no light is emitted and the visible light probe does not indicate an increase in upconversion light intensity, it enters fine-tuning mode.

[0096] 7. Slowly adjust the cavity mirror to match the slower response speed of the power meter until the light output enters standby mode or the visible light probe is activated;

[0097] 8. If the intensity of the upconversion light increases, return to step 5.

[0098] Example 2

[0099] A 1.6-micron laser device for automatic output based on intelligent control of cavity mirror angle using fluorescence intensity variation is characterized by comprising: a 1480nm fiber laser pump source (1-1) for providing pump light; a 100mm collimating mirror (1-2) and a 100mm focusing mirror (1-3) for focusing and collimating the pump light; an input end mirror (1-4) for transmitting the pump light and reflecting the laser; an Er-doped laser crystal (1-5) for emitting laser light through population inversion; an end mirror (1-6) for reflecting the laser and filtering excess pump light; an output coupling mirror (1-7) for outputting the laser; a high-reflectivity mirror (1-8) for reflecting the laser, forming a complete laser cavity; and a personal computer (2-1) for mounting. The device has a Python interface for running programs and can communicate bidirectionally with external devices via wired or wireless means through high-speed data interfaces such as RS-232, USB, Bluetooth, LAN, and GPIB, enabling control of the entire device and the reception and processing of data. A visible light probe (2-2) has a fast response speed, detecting changes in light intensity when light is emitted and transmitting the data to a personal computer. A cavity mirror control rail (2-3) controls the forward and backward movement of the high-reflectivity mirror, adjusting the cavity length. A cavity mirror angle controller (2-4) controls the horizontal and vertical angles of the high-reflectivity mirror to achieve light emission. An infrared power meter (2-5) has low response efficiency and only checks whether light is emitted. And achieve the following functions: (1) Real-time judgment of the current laser output status: For Er system lasers, the crystal brightness is observed in real time by the visible light probe (2-2) to detect the luminous intensity of the upconversion light of the crystal. When a significant change in light intensity is detected, information is sent to the personal computer (2-1) in time to warn of the change in output status; (2) Automatic control of laser output: After receiving the message of the change in luminous intensity given by the visible light probe (2-2), the personal computer combines the data of the power meter (2-5) to further judge the current output status. After determining that the laser has no light, the light-finding program is started. The self-made control displacement stage (2-3) and cavity mirror angle controller (2-4) are moved continuously and slowly, so that the computer has enough time to respond to the light intensity change signal sent by the visible light probe and then stop the light-finding program.

[0100] The pump laser beam passes through a set of collimating lenses to ensure high parallelism when incident on the crystal end face. The Er-doped crystal used in the laser cavity emits a bright yellow-green light when pumped.

[0101] The personal computer (1-1) in the automatic control system (1) can be an MSI Titan 17 (RTX4080 Laptop) with Python version 3.12 and Spyder 5.4.3 as the Python runtime platform. The system includes: a detection module for capturing the upconversion light intensity of the Er-doped crystal; a PC information processing module (2-1) for analyzing whether the intensity change information provided by the visible light probe exceeds the threshold causing the 3-micron laser to disappear or reappear; and a feedback control module for fine-tuning the position of the control cavity mirror until the detection module detects the laser again. The adjustment mechanism consists of a cavity mirror control rail (2-3) and a cavity mirror angle controller (2-4), which achieve high-precision crystal angle adjustment through a stepper motor or piezoelectric ceramic drive. After the control program emits light, it is in standby or monitoring state. In monitoring state, it only detects the infrared power meter. When the power meter power is found to be too low, it wakes up the light-finding program.

[0102] A method for adjusting the optical path based on the intensity jump of upconversion light in an Er crystal includes the following steps:

[0103] 1. Establish the basic optical path;

[0104] 2. When the pump source is turned on, the Er crystal emits bright upconversion yellow-green light;

[0105] 3. Turn on the infrared power meter to confirm the power meter reading in the absence of light;

[0106] 4. Turn on the visible light probe, detect the upconversion light, and record its changes;

[0107] 5. Open your personal computer and run the light-finding program, continuously adjusting the angle and position of the end lens;

[0108] 6. The intensity of upconversion light in Er-doped crystals is significantly reduced, and the visible light probe sends the detection data to a personal computer.

[0109] 7. The personal computer immediately stops the motor and checks the power meter reading. If no light is emitted and the visible light probe does not indicate an increase in upconversion light intensity, it enters fine-tuning mode.

[0110] 8. Slowly adjust the cavity mirror to match the slower response speed of the power meter until the light output enters standby mode or the visible light probe detects an increase in the intensity of the upconversion light. Then return to step 5.

[0111] Example 3

[0112] A 3-micron two-cavity laser device for automatic output based on intelligent control of the cavity mirror angle using fluorescence intensity variation is characterized by comprising: a 976nm fiber laser pump source (1-1) for providing pump light; a 100mm collimating mirror (1-2) and a 100mm focusing mirror (1-3) for focusing and collimating the pump light; an input mirror (1-4) for transmitting the pump light and reflecting the laser; an Er-doped laser crystal (1-5) for emitting laser light through population inversion; an output coupling mirror (1-6) for outputting the laser; a dichroic mirror for reflecting the laser light and transmitting the pump light; and a personal computer (2-1) equipped with P... The ython can run programs and communicate bidirectionally with external devices via wired or wireless means through high-speed data interfaces such as RS-232, USB, Bluetooth, LAN, and GPIB, enabling control of the entire device and the reception and processing of data; the visible light probe (2-2) has a fast response speed and detects changes in light intensity when light is emitted and not emitted, transmitting the data to a personal computer; the endoscope angle controller (2-4) controls the horizontal and pitch angles of the high-reflectivity mirror to achieve light emission; the infrared power meter (2-5) has a low response efficiency and only checks whether light is emitted. And achieve the following functions: (1) Real-time judgment of the current laser output status: For Er system lasers, the crystal brightness is observed in real time by the visible light probe (2-2) to detect the luminous intensity of the upconversion light of the crystal. When a significant change in light intensity is detected, information is sent to the personal computer (2-1) in time to warn of the change in output status; (2) Automatic control of laser output: After receiving the message of the change in luminous intensity given by the visible light probe (2-2), the personal computer combines the data of the power meter (2-5) to further judge the current output status. After determining that the laser has no light, the light-finding program is started. The cavity mirror angle controller (2-4) moves continuously and slowly, so that the computer has enough time to respond to the light intensity change signal sent by the visible light probe and then stop the light-finding program.

[0113] The pump laser beam passes through a set of collimating lenses to ensure high parallelism when incident on the crystal end face. The Er-doped crystal used in the laser cavity emits a bright yellow-green light when pumped.

[0114] The personal computer (1-1) in the automatic control system can be an MSI Titan 17 (RTX4080 Laptop) running Python version 3.12 on Spyder 5.4.3. The system includes: a detection module for capturing the upconversion light intensity of the Er-doped crystal; a PC information processing module (2-1) for analyzing whether the intensity change information provided by the visible light probe exceeds a threshold causing the 3-micron laser to disappear or reappear; and a feedback control module for fine-tuning the cavity mirror angle until the detection module detects the laser again. The adjustment mechanism is an angle controller (2-3), which achieves high-precision crystal angle adjustment via a stepper motor or piezoelectric ceramic drive. After light emission, the control program enters standby or monitoring mode. In monitoring mode, it only detects the infrared power meter; when the power meter power is found to be too low, the light-finding program is activated.

[0115] A method for adjusting the optical path based on the intensity jump of upconversion light in an Er crystal includes the following steps:

[0116] 1. Establish the basic optical path;

[0117] 2. When the pump source is turned on, the Er crystal emits bright upconversion yellow-green light;

[0118] 3. Turn on the infrared power meter to confirm the power meter reading in the absence of light;

[0119] 4. Turn on the visible light probe, detect the upconversion light, and record its changes;

[0120] 5. Open your personal computer and run the light-finding program, continuously adjusting the angle and position of the end lens;

[0121] 6. The intensity of upconversion light in Er-doped crystals is significantly reduced, and the visible light probe sends the detection data to a personal computer.

[0122] 7. The personal computer immediately stops the motor and checks the power meter reading. If no light is emitted and the visible light probe does not indicate an increase in upconversion light intensity, it enters fine-tuning mode.

[0123] 8. Slowly adjust the cavity mirror to match the slower response speed of the power meter until the light output enters standby mode or the visible light probe detects an increase in the intensity of the upconversion light. Then return to step 5.

[0124] By integrating the optical properties of Er-doped crystals with intelligent closed-loop control technology, significant implementation effects have been demonstrated in practical applications, specifically in the following aspects:

[0125] 1. Cost savings and hardware simplification

[0126] Replacing expensive mid-infrared detectors: Traditional 3-micron lasers rely on high-precision detectors, which are costly. This application uses a silicon-based visible light probe and a self-made controller, reducing hardware costs by about 90%.

[0127] 2. Improved response speed and stability

[0128] Rapid detuning detection and recovery: In laboratory testing, when human disturbance causes the endoscope to shift, the system quickly captures the fluorescence intensity jump using a visible light probe and immediately performs closed-loop adjustment of the endoscope angle and position to restore the 3-micron laser output.

[0129] Anti-interference capability: Under simulated interference environment, the system operates continuously, and the standard deviation of laser power fluctuation over a long period of time is significantly reduced.

[0130] 3. Energy consumption and maintenance optimization

[0131] Improved energy efficiency: By dynamically adjusting the pump power and the matching state with the endoscope, the overall energy efficiency of the system is improved.

[0132] Extended maintenance cycle: Due to the system's strong anti-disturbance capability, the calibration cycle of key components (such as high reflectivity mirrors) has been extended from once a week to once a quarter, reducing maintenance costs.

[0133] 4. Compatibility and scalability

[0134] Multi-crystal compatibility: The system has been verified to be compatible with various crystals such as Er:YAG, Er:Y2O3, and Er:YLF, and the 3-micron laser output power range covers 1-10W to meet the needs of different application scenarios.

[0135] Modular design: The automatic control system can be packaged independently, supporting rapid integration with existing laser structures.

[0136] Summarize

[0137] This application achieves breakthroughs in cost, response speed, stability, and applicability of 3-micron lasers by combining "optical characteristic substitution detection" with "intelligent dynamic control," providing cost-effective and reliable automated laser solutions for medical, industrial, and other fields, with significant market competitiveness and industrialization prospects.

Claims

1. An intelligent adjustment device for an Er-doped solid-state laser, characterized in that, include: Pump source (1-1) is used to provide pump light; Collimating lenses (1-2) are used to convert diverging pump light into parallel light; The focusing lens (1-3) is positioned on the side of the collimating lens (1-2) away from the pump source (1-1) and is used to focus the pump light; The input end mirror (1-4) is located on the side of the focusing mirror (1-3) away from the collimating mirror (1-2) and is used to transmit pump light and reflect laser light. An Er-doped laser crystal (1-5) is placed on the side of the input end mirror (1-4) away from the focusing mirror (1-3) to emit laser light through population inversion. End mirror (1-6) is set on one side of the input end mirror (1-4) in the Er-doped laser crystal (1-5) to reflect the laser and filter out excess pump light; The output coupling mirror (1-7) is positioned facing the input mirror (1-4) and is used to output laser light. High-reflectivity mirrors (1-8) are positioned facing the end mirrors (1-6) to reflect laser light; The PC information processing module, a personal computer (2-1), is used to control the entire device and receive and process data. The detection module, a visible light probe (2-2), is set on one side of the Er-doped laser crystal (1-5) to detect the change in intensity of the upconverted light of the Er-doped laser crystal (1-5) under the conditions of emitting light and not emitting light, and transmits the data to the PC information processing module. An infrared power meter (2-5) is installed on one side of the output coupling mirror (1-7) to check whether light is emitted; The feedback control module is used to adjust the distance between the high reflectivity mirror (1-8) and the end mirror (1-6) and the angle of the high reflectivity mirror (1-8) until the infrared power meter (2-5) detects the laser signal; The feedback control module, detection module, infrared power meter (2-5) are electrically connected to the PC information processing module; the input end mirror (1-4), end mirror (1-6), output coupling mirror (1-7), and high reflectivity mirror (1-8) form a four-mirror cavity laser resonator; the PC information processing module, detection module, feedback control module, and infrared power meter (2-5) constitute an automatic control system.

2. The intelligent adjustment device for an Er-doped solid-state laser as described in claim 1, characterized in that, The feedback control module includes a cavity mirror control rail (2-3) and a cavity mirror angle controller (2-4); a high-reflectivity mirror (1-8) is mounted on the cavity mirror control rail (2-3), which is used to adjust the distance between the high-reflectivity mirror (1-8) and the end mirror (1-6); a cavity mirror angle controller (2-4) is mounted on the cavity mirror control rail (2-3), which is used to control the horizontal and pitch angles of the high-reflectivity mirror (1-8) to achieve light output; the cavity mirror control rail (2-3) and the cavity mirror angle controller (2-4) are electrically connected to the PC information processing module to realize cavity shape control after laser extinction, thereby finding the light source.

3. The intelligent adjustment device for an Er-doped solid-state laser as described in claim 1, characterized in that, The detection module is a visible light probe (2-2); the PC information processing module is a personal computer (2-1) used to analyze whether the intensity change information provided by the visible light probe (2-2) exceeds the threshold that causes the 1.6-micron and 3-micron lasers to disappear or be generated.

4. The intelligent adjustment device for an Er-doped solid-state laser as described in claim 2, characterized in that, The cavity mirror control rail (2-3) and cavity mirror angle controller (2-4) are driven by stepper motors or piezoelectric ceramics to realize the distance adjustment between the high reflective mirror (1-8) and the end mirror (1-6), and the horizontal and pitch angle adjustment of the high reflective mirror (1-8).

5. An intelligent modulation method for an Er-doped solid-state laser, based on the device described in any one of claims 1 to 4, characterized in that, Includes the following steps: S1. Establish the basic optical path; S2. Start the pump source (1-1), and the Er-doped laser crystal (1-5) emits bright upconversion yellow-green light; S3. Turn on the infrared power meter (2-5) to confirm the infrared power meter (2-5) reading in the absence of light. S4. Turn on the visible light probe (2-2), detect the upconversion light, and record its changes; S5. Turn on the personal computer (2-1) and run the built-in light-finding program, continuously adjusting the angle and position of the high-reflectivity mirror (1-8); S6. The intensity of the upconversion light from the Er-doped laser crystal (1-5) is significantly reduced, and the visible light probe (2-2) sends the detection data to the personal computer (2-1). S7. The personal computer (2-1) immediately stops the movement of the feedback control module and checks the reading of the infrared power meter (2-5). If no light is emitted and the visible light probe (2-2) does not indicate that the upconversion light intensity has increased, it enters the fine-tuning mode. S8. Slowly adjust the laser resonator to match the slower response speed of the infrared power meter (2-5) until the emitted light enters standby mode or the visible light probe (2-2) detects that the upconversion light intensity has increased, then return to step S5.

6. The intelligent modulation method for an Er-doped solid-state laser as described in claim 5, characterized in that, During the laser resonator angle adjustment process, the upconversion light intensity is analyzed in real time using a visible light probe (2-2) to improve efficiency and control the laser output.

7. The intelligent modulation method for an Er-doped solid-state laser as described in claim 5, characterized in that, The initial upconversion light intensity and the initial light intensity measured by the infrared power meter (2-5) will be used as a reference to determine whether there is light or not.

8. The intelligent modulation method for an Er-doped solid-state laser as described in claim 5, characterized in that, The infrared power meter (2-5) operates based on thermal sensing; the visible light probe (2-2) responds between 500-600nm wavelength and is a probe that detects the upconversion light situation in real time; the visible light probe (2-2) only needs to transmit changes in light intensity, using a camera that transmits images to a personal computer or a probe that detects light intensity; after the laser extinction is detected, the high reflectivity mirror (1-8) is automatically used to find the light through the personal computer (2-1); the automatic adjustment of laser control and light emission detection is realized through the personal computer (2-1).

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