Novel solid laser system

Abstract

The utility model relates to a novel solid laser system, which comprises a total reflective mirror, a laser working substance, a pumping source, an output mirror and an energy detection unit, the laser working substance is arranged in a resonant cavity formed by the total reflective mirror and the output mirror, and the pumping source is arranged on one side of the laser working substance to excite the laser working substance to generate an excitation light beam. The excitation light beam passes through the resonant cavity to form an initial light beam, and the energy detection unit receives part of the initial light beam and detects to obtain light beam data, and transmits the rest of the initial light beam to the surface of a target object; the energy detection unit comprises a spectroscope and a detector, the spectroscope is arranged in the direction of the initial light beam, and the light splitting angle between the spectroscope and the optical axis direction of the initial light beam ranges from 5 degrees to 15 degrees. By adopting the novel solid laser system, the utilization rate of laser energy can be greatly improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a novel solid laser system, in particular to a novel solid laser system. BACKGROUND

[0002] The middle infrared laser of wavelength 2.7-3 mu band has important application in medical science, atmospheric remote sensing, nonlinear optics, military and other fields. Because the middle infrared laser of 2.7-3 mu band is similar to the water absorption peak, can be strongly absorbed by water molecule and can be strongly absorbed by organic matter and inorganic hydroxyapatite in biological tissue, therefore has wide application in medical clinical resection operation, oral treatment and laser cosmetic field, especially in the application in solid laser system.

[0003] Please refer to Figure 1 , the common solid laser system of 2.7-3 mu band in medical field currently includes full reflection mirror 1, laser working substance 2, pump source 3, output mirror 4 and energy detection unit 5. The full reflection mirror 1 and output mirror 4 form resonant cavity, and the resonant cavity and laser working substance 2 and pump source 3 jointly constitute the basic three elements of solid laser, to generate stable laser transmission output mirror 4 and form initial light beam;The energy detection unit 5 is arranged in the direction of initial light beam, to detect the intensity of initial light beam. The energy detection unit 5 includes beam splitter 51 and detector 54, the beam splitter 51 reflects a part of initial light beam and forms probe light beam, the detector 54 receives probe light beam and detects the intensity of probe light beam;The beam splitter 51 transmits the remaining part of initial light beam and forms action light beam, and the action light beam is irradiated on the surface of target 10 and realizes laser action.

[0004] However, this kind of solid laser system has the following disadvantages, such as low energy utilization rate, lack of safety and protection measures, insufficient intelligent integration and remote monitoring. UTILITY MODEL CONTENT

[0005] Based on this, the utility model aims at providing a novel solid laser system, which can improve the utilization rate of the system, ensure the output quality by setting energy monitoring unit and light gate cooperation, reduce security risks, greatly improve the reliability and controllability of laser system, and ensure the safety in wide application scenarios.

[0006] A novel solid-state laser system includes a total reflection mirror, a laser gain medium, a pump source, an output mirror, and an energy detection unit. The laser gain medium is disposed in a resonant cavity formed by the total reflection mirror and the output mirror. The pump source is disposed on one side of the laser gain medium, exciting the laser gain medium to generate an excitation beam. The excitation beam passes through the resonant cavity to form an initial beam. The energy detection unit receives a portion of the initial beam and detects the beam data, transmitting the remaining initial beam onto the surface of a target object. The energy detection unit includes a beam splitter and a detector. The beam splitter is disposed in the direction of the initial beam, reflecting a portion of the initial beam to form a probe beam. The detector receives the probe beam and detects the beam data. The beam splitter transmits the remaining initial beam to form an active beam, which illuminates the surface of the target object. The beam splitting angle between the beam splitter and the optical axis of the initial beam ranges from 5° to 15°.

[0007] Furthermore, it also includes an optical shutter, which is disposed between the beam splitter and the target object, and prevents the emission of the action beam when the optical shutter is closed.

[0008] Furthermore, it also includes a processor connected to a beam splitter, a detector, and an optical shutter. The processor receives beam data from the detector and controls the beam splitting angle of the beam splitter and the opening and closing of the optical shutter based on the beam data. When the detector detects an increase in laser energy, the processor adjusts the beam splitter to decrease the beam splitting angle so that the energy received by the detector remains within a certain safe range. When the detector detects a decrease in laser energy, the processor adjusts the beam splitter to increase the beam splitting angle so that the energy received by the detector remains above the detector's detection threshold. When the detector detects that the laser energy exceeds the output threshold, it closes the optical shutter.

[0009] Furthermore, it also includes a beam combiner and an indicator light source. The beam combiner is positioned between the target and the shutter, and the indicator light source is positioned on one side of the beam combiner. The indicator light source emits an indicator beam, which illuminates the surface of the beam combiner. The beam combiner reflects the indicator beam and combines it with the action beam to illuminate the surface of the target.

[0010] Furthermore, the energy detection unit also includes a rotatable reflector that reflects the detection beam into the detector.

[0011] Furthermore, the processor is connected to the reflector and controls the reflector to rotate according to the beam splitter's beam splitting angle so that the detector can stably receive the detection beam.

[0012] Furthermore, one side of the total reflection mirror is coated with a 2940nm high reflectivity film; the laser working material includes an Er:YAG crystal with 2940nm antireflection coatings at both ends along the normal direction of the total reflection mirror, wherein the Er:YAG crystal has Er... 3+The doping concentration is 50 at%, and the size is φ4*90mm; the pump source is a xenon lamp with an emission range of 400-1100nm and an electrode spacing of 100mm; the pump source generates an excitation beam of 2.7-3μm from the laser working material; the output mirror is a low-transmittance output mirror in the 2940nm band, with a transmittance of 12% for 2940nm band beams.

[0013] Furthermore, both sides of the beam splitter are coated with a 2940nm antireflection film.

[0014] Furthermore, the beam combiner is positioned between the target and the optical shutter. Its surface near the optical shutter is coated with a 2940nm high transmittance film and a 532nm high reflectance film, while its surface away from the optical shutter is coated with a 2940nm high transmittance film.

[0015] Furthermore, the output power of the indicator light source is 1.605mW, and the center wavelength of the indicator beam is 531.94nm and the linewidth is 2.83nm.

[0016] To better understand and implement this invention, the following detailed description is provided in conjunction with the accompanying drawings. Attached Figure Description

[0017] Figure 1 Here is a structural diagram of an existing solid-state laser system;

[0018] Figure 2 This is a structural diagram of the novel solid-state laser system of this application;

[0019] Figure 3 for Figure 2 The specific structural diagram of the energy detection unit 5 in the novel solid-state laser system. Detailed Implementation

[0020] The applicant carefully analyzed existing solid-state laser systems and found that their low energy utilization rate was due to a significant portion of the initial beam being reflected into the energy detection unit 5, resulting in a reduction in the energy of the emitted beam and consequently, low system energy utilization. To address this, the applicant conducted various adjustments to all components and discovered that, because the components in the energy detection unit 5 are relatively sensitive and do not require a very strong detection beam, the conventional 45° alignment of the beam splitter 51 along the optical axis in existing solid-state laser systems resulted in a detection beam energy far exceeding the requirements of the energy detection unit 5, leading to wasted laser energy. Therefore, the applicant attempted to improve the energy detection unit 5 by reducing the angle between the beam splitter 51 and the optical axis to decrease the intensity of the detection beam, thereby improving the system's energy utilization rate. Furthermore, an optical shutter 6 and an indicator unit were added to ensure the system's safety and controllability.

[0021] Please see Figure 2The novel solid-state laser system of this application includes a total reflection mirror 1, a laser working medium 2, a pump source 3, an output mirror 4, an energy detection unit 5, an optical shutter 6, a beam combiner 7, an indicator light source 7, a light guide arm 9, and a processor (not shown).

[0022] One side of the total reflection mirror 1 is coated with a 2940nm high reflectivity film, and the material of the total reflection mirror 1 is fused silica.

[0023] The laser working medium 2 is disposed on the side of the total reflection mirror 1 coated with a 2940nm high reflectivity film. The material is Er:YAG crystal, and both ends of the crystal along the normal direction of the total reflection mirror 1 are coated with a 2940nm antireflection film. The Er:YAG crystal has a high reflectivity of Er... 3+ The doping concentration is 50 at%, and the size is φ4*90mm.

[0024] The pump source 3 is a xenon lamp made of ultraviolet-filtering quartz tube with a light emission range of 400-1100nm and an electrode spacing of 100mm. The pump light it generates excites the laser working medium 2, causing the laser working medium 2 to generate an excitation beam. The excitation beam is a mid-infrared laser with a wavelength of 2.7-3μm and propagates in a direction perpendicular to the total reflection mirror 1.

[0025] The output mirror 4 is a low-transmittance output mirror in the 2940nm band, with a transmittance of 12% for 2940nm band beams, and is made of sapphire. It forms a resonant cavity with the total reflection mirror 1, and together with the laser working medium 2 and the pump source 3, constitutes the three necessary elements of a laser, thus forming the solid-state laser of the novel solid-state laser system of this application.

[0026] Please see Figure 3 The energy detection unit 5 includes a beam splitter 51, a reflector 52, a filter 53, and a detector 54. The beam splitter 51 is positioned in the direction of the initial beam, reflecting a portion of the initial beam to form a probe beam and transmitting the remaining portion of the initial beam to form an active beam, forming a beam splitting angle with the optical axis of the initial beam. The probe beam is reflected by the reflector 52, transmitted through the filter 53, and reaches the detector 54, where it is received.

[0027] The beam splitter 51 is coated with a 45° 2940nm antireflection film on both sides, reflecting the initial beam to form a detection beam. It is understood that the beam splitter 51's splitting angle must effectively separate the laser beam; therefore, the splitting angle needs to be greater than a certain angle to meet the detection threshold of the detector 54. Simultaneously, it needs to minimize the loss of the main beam's power or energy; therefore, the emission angle needs to be smaller than a certain angle. Thus, its splitting angle needs to be set between 5° and 15°, transmitting a small portion of the separated laser energy to the detector 54, while the majority of the laser energy continues to be transmitted to the surface of the target object 10. The splitting angle can be adjusted according to the sensitivity of the selected detector 54 to ensure sufficient signal for energy detection. Choosing an appropriate angle helps improve measurement accuracy while avoiding unnecessary beam scattering losses. For high-power laser applications, the angle of the beam splitter 51 needs to be controlled within the range of 5° to 10° to avoid thermal or optical surface damage caused by scattering effects between the beam and the surface of the beam splitter 51.

[0028] The reflector 52 reflects the detection beam into the detector 54. By setting the reflector 52, the position of the detector 54 is not limited by the angle between the beam splitter 51 and the optical axis. When the angle between the beam splitter 51 and the optical axis changes, the reflector 52 can be rotated so that the detector can maintain normal detection without changing its position.

[0029] The filter 53 is disposed between the beam splitter 51 and the detector 54, and can adjust the beam intensity incident on the detector 54 to prevent excessive energy from damaging the detector 54.

[0030] The material of the detector 54 can be InGaAs (indium gallium arsenide) or PbSe (lead selenide). InGaAs detector 54 is mainly used in the laser band of 2-3μm and has the advantages of high sensitivity and fast response speed. PbSe detector 54 has good response capability in the laser band of 2-5μm and is suitable for long-term optical monitoring.

[0031] The optical shutter 6 is positioned in the direction of the laser beam. It is opened and closed by swinging the rocker arm controlled by a servo motor, thereby controlling the output of the laser beam. When the laser energy output by the system is higher than the output threshold, the optical shutter 6 is closed to prevent the output of the laser beam.

[0032] The beam combiner 7 is positioned between the target object 10 and the optical shutter 6. The surface of the beam combiner 7 near the optical shutter 6 is coated with a 2940nm high transmittance film and a 532nm high reflectance film, while the surface of the beam combiner 7 away from the optical shutter 6 is coated with a 2940nm high transmittance film.

[0033] The indicator light source 7 emits an indicator beam, which illuminates the surface of the beam combiner 7. The beam combiner 7 reflects the indicator beam and combines it with the active beam, both illuminating the surface of the target object 10. The center wavelength of the indicator beam is 531.94 nm, and the linewidth is 2.83 nm. The output power of the indicator light source 7 is 1.605 mW. It is understood that the indicator light source 7 uses a 532 nm semiconductor laser. The 532 nm wavelength of the laser is within the visible light range and can be used as an indicator beam in medical treatment, providing operators and patients with more precise treatment methods. Using a 532 nm semiconductor laser as the indicator beam, combined with the 2940 nm active beam through the beam combiner 7, allows for alignment and adjustment using a low-power indicator beam. The shutter 6 is then opened only after the effective position on the target object 10 is determined, thereby reducing the emission of high-power laser and protecting the safety of the equipment and operators.

[0034] The light guide arm 9 is positioned between the target object 10 and the beam combiner 7, serving as the output end of the system, and its stroke is 1500mm. The light guide arm 9 can be a simple plane mirror that directly reflects the active beam onto the surface of the target object 10, or it can be an optical waveguide that guides the active beam to the surface of the target object 10.

[0035] The processor is connected to the beam splitter 51, detector 54, and shutter 6. It receives beam data from the detector 54 and controls the splitting angle of the beam splitter 51 and the opening and closing of the shutter 6 based on the beam data. When the detector 54 detects an increase in laser energy, the processor adjusts the beam splitter 51 to decrease the splitting angle, keeping the energy received by the detector 54 within a safe range. When the detector 54 detects a decrease in laser energy, the processor adjusts the beam splitter 51 to increase the splitting angle, keeping the energy received by the detector 54 above its detection threshold. When the detector 54 detects that the laser energy exceeds the output threshold, it closes the shutter 6. Furthermore, the processor is also connected to a reflector 52, controlling the reflector 52 to rotate according to the splitting angle of the beam splitter 51, ensuring that the detector 54 stably receives the detection beam. The energy of the detection beam detected by the detector 54 needs to be calculated using the splitting angle of the beam splitter 51 to obtain the energy intensity of the output beam.

[0036] It is understandable that the novel solid-state laser system of this application can use other excitation sources as pump source 3, and similarly, the laser gain medium 2 can also use other types of gain media. The novel solid-state laser system of this application sets all adjustments at the rear end, without the need to adjust the solid-state laser itself, thus avoiding interference with the laser source, and eliminating the need for cooling and reheating for excitation conditions that require heating.

[0037] The key point and intended protection of this application is that it combines the energy monitoring unit in the existing solid-state laser system. By reducing the angle of use of the beam splitter 51 in the monitoring unit, real-time monitoring of the laser power can be achieved. Furthermore, by reducing the attenuation of laser energy by the beam splitter 51, the novel solid-state laser system of this application can be ensured to operate stably and efficiently, thereby improving the service life of the device. Moreover, the safety and controllability of using the novel solid-state laser system of this application to treat patients' skin, oral cavity, and other affected areas are greatly improved.

[0038] The embodiments described above only illustrate the preferred implementation of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of this utility model, and this utility model also intends to include these modifications and variations.

Claims

1. A novel solid state laser system, characterized by: The energy detection unit comprises a beamsplitter and a detector, the beamsplitter is arranged in the direction of the initial light beam, reflects part of the initial light beam to form a detection light beam, the detector receives the detection light beam and detects the light beam data, the beamsplitter transmits the remaining initial light beam to form an action light beam, and the action light beam irradiates on the target object surface; the beamsplitting angle of the beamsplitter with the optical axis direction of the initial light beam ranges from 5° to 15°.

2. The novel solid state laser system of claim 1, wherein: Further comprising a light shutter, the light shutter is arranged between the beamsplitter and the target object, and blocks the emission of the action light beam when the light shutter is closed.

3. The novel solid state laser system of claim 2, wherein: Further comprising a processor connected with the beamsplitter, the detector and the light shutter, receiving the light beam data of the detector, and controlling the beamsplitting angle of the beamsplitter and the opening and closing of the light shutter according to the light beam data; when the detector detects that the laser energy is increased, the processor adjusts the beamsplitter to reduce the beamsplitting angle, so that the energy received by the detector is kept within a certain safety range; when the detector detects that the laser energy is decreased, the processor adjusts the beamsplitter to increase the beamsplitting angle, so that the energy received by the detector is kept above the detection threshold of the detector; when the detector detects that the laser energy exceeds the output threshold, the light shutter is closed.

4. The novel solid state laser system of claim 3, wherein: Further comprising a beam combiner and an indicating light source, the beam combiner is arranged between the target object and the light shutter, the indicating light source is arranged on one side of the beam combiner, the indicating light source emits an indicating light beam, the indicating light beam irradiates on the surface of the beam combiner, is reflected by the beam combiner and is combined with the action light beam to irradiate on the surface of the target object.

5. The novel solid state laser system of claim 4, wherein: The energy detection unit further comprises a reflector, the reflector is rotatable and reflects the detection light beam to the detector.

6. The novel solid state laser system of claim 5, wherein: The processor is connected with the reflector and controls the reflector to rotate according to the beamsplitting angle of the beamsplitter, so that the detector stably receives the detection light beam.

7. The novel solid state laser system of claim 6, wherein: One side of the total reflection mirror is coated with a 2940nm high reflectivity film; the laser working substance comprises an Er:YAG crystal coated with a 2940nm antireflection film at both ends in the normal direction of the total reflection mirror, and the size is φ4*90mm; the pump source is a xenon lamp with a light emission range of 400-1100nm and an electrode spacing of 100mm; the wavelength of the excitation light beam generated by the pump source from the laser working substance is 2.7-3μm; the output mirror is a low-transmittance output mirror for 2940nm waveband, and the transmittance for 2940nm waveband light beam is 12%.

8. The novel solid state laser system of claim 7, wherein: Both sides of the beamsplitter are coated with a 2940nm antireflection film.

9. The novel solid state laser system of claim 8, wherein: The beam combiner is arranged between the target object and the light shutter, the surface close to the light shutter is coated with a 2940nm high-transmittance film and a 532nm high-reflectivity film, and the surface away from the light shutter is coated with a 2940nm high-transmittance film.

10. The novel solid state laser system of claim 9, wherein: The indicating light source outputs power of 1.605 mW, and the center wavelength of the indicating light beam is 531.94 nm and the line width is 2.83 nm. The indicating light source outputs power of 1.605 mW, and the center wavelength of the indicating light beam is 531.94 nm and the line width is 2.83 nm.

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