Red-green-blue three-primary-color continuous solid laser

Abstract

The invention discloses a red-green-blue three-primary-color continuous solid laser, which belongs to the laser technology and comprises a blue light semiconductor light source module, a light splitting module, a composite resonant cavity, a 45-degree beam splitter and a light combining module, the light splitting module is used for splitting blue light generated by the blue light semiconductor light source module into two beams and inputting the two beams into the composite resonant cavity and the light combining module respectively; the composite resonant cavity comprises a blue light input mirror, a Pr: YLF laser crystal, a 640nm output mirror and a 522nm output mirror which are sequentially arranged along a light path transmission direction; wherein the blue light input mirror, the Pr: YLF laser crystal and the 640nm output mirror form a red light resonant cavity; the blue light input mirror, the Pr: YLF laser crystal and the 522nm output mirror form a green light resonant cavity; the 45-degree beam splitter is plated with a 640nm anti-reflection dielectric film and a 522nm high-reflection dielectric film, and is used for splitting light passing through the composite resonant cavity into green light and red light; and the light combining module is used for combining the other beam of blue light into red light and green light. According to the invention, high-performance three-primary-color laser light source output synthesis can be realized.

Description

Technical Field

[0001] The present invention relates to the field of laser technology, and more particularly to a red, green and blue three-primary color continuous solid laser. Background Art

[0002] The combination of the three primary colors of red, green and blue covers the core bands of the visible spectrum of the human eye, and its application value covers display technology, biomedicine, environmental protection and other fields.

[0003] Laser light sources are ideal visible light sources because of their advantages of good monochromaticity, high brightness, and good directionality. In the field of display technology, laser display technology uses video signals to modulate laser beams to directly scan the screen to form images. It has the advantages of high color saturation, high resolution, high contrast, and a wide viewing angle. However, laser light sources that can simultaneously output the three primary colors of red, green, and blue are very rare. According to the BT.2020 standard, the wavelength standards for the three primary colors of red, green, and blue are 630nm, 532nm, and 467nm, respectively. Currently, there are limited technical means to generate lasers within this wavelength range, mainly including the following methods:

[0004] (1) Near-ultraviolet laser excitation of red, green, and blue primary color phosphors: A near-ultraviolet laser diode is used to excite red, green, and blue primary color phosphors, and a three-primary color light source is obtained through a filter. The obtained light source has the characteristics of high color rendering index, good color reproduction, and good lighting effect. However, the use of optical filters cannot take into account both brightness and color purity. The generated fluorescence is no longer strictly considered as laser, and the energy density is low. In addition, the phosphor powder has Stokes loss, and the photoelectric conversion efficiency is low, which will cause the color temperature of the light source to fluctuate.

[0005] (2) Semiconductor laser: By using three-primary-color semiconductor lasers, different light colors can be obtained by controlling the output power of each laser. Since phosphor is not used, there is no Stokes loss, the light color is more stable, and the electro-optical conversion efficiency is higher. However, the disadvantages of semiconductor lasers are also very obvious: the quality of the semiconductor laser spot is poor, which will affect the final color rendering effect; semiconductor lasers are more sensitive to temperature changes, and when the temperature changes, the output wavelength will also change accordingly; the light attenuation rates of different lasers are different, which may cause changes in the color characteristics of the light source during use, affecting the stability of the light source.

[0006] (3) Pulsed all-solid-state laser: Shandong University's master's thesis "Optical parametric oscillator and its frequency doubling to achieve RGB three-primary color all-solid-state laser" mentioned the use of laser and second-order nonlinear optical effects to generate three-primary color laser. The laser diode pumps the laser crystal to generate 1064nm laser, which is frequency-doubled by the nonlinear crystal to generate pulsed green light, which continues to serve as the pump source of the optical parametric oscillator to obtain a wide-band near-infrared laser. Finally, the nonlinear frequency-doubling crystal is used to achieve three-primary color laser output of 461nm, 628nm and 532nm. The laser spot generated by this solution has good quality and uniform and concentrated energy distribution. However, the pulse light source and the periodic triggering of the light source are not conducive to daily color display applications. In addition, the optical path is relatively complex, the production cost is high, and the peak power of the pulse light source is high, which has a high potential risk to the human eye.

[0007] (4) Continuous solid-state laser: The laser generation scheme for visible light also includes intracavity frequency doubling scheme, using Nd 3+ ions or Yb 3+ Ion-doped laser crystals serve as the working material, generating near-infrared laser light, which is then converted to visible laser light through nonlinear processes such as frequency doubling or sum frequency. Chinese patent CN100334480C discloses a scheme for generating three primary-color lasers: For red light, a resonant cavity using Nd:YAG crystals as the working material generates a 1342nm or 1319nm near-infrared laser, which is then frequency-doubled intracavitarily or extracavitarily to generate 671nm or 660nm red light. For green light, a resonant cavity using Yb:YAG crystals as the working material generates a 1030nm near-infrared laser, which is then frequency-doubled intracavitarily or extracavitarily to generate 510nm green light. The blue light path uses an Nd:YAG crystal to generate a 1319nm near-infrared laser, which is then frequency-doubled to 660nm using a frequency-doubling crystal. The frequency-doubled 660nm light is then sum-frequency-tripled with the 1319nm fundamental light to generate a frequency-tripled 440nm blue light. Finally, a transmitting mirror and a beam combiner are combined to produce the three primary-color laser outputs: red, green, and blue. The red, green and blue primary color light sources generated using this solution have stable power, are continuous light, and have a wide color gamut. However, the optical path is complex and requires pump sources with different output wavelengths, different types of laser crystals, and multiple frequency-doubling crystals with different tangent directions to achieve multi-color laser output, resulting in high laser costs.

[0008] In the biomedical field, multifunctional medical equipment with multi-wavelength laser light sources as the core has important application value. Currently, common red light sources cover 630-700nm, with moderate penetration depth, significant photobiostimulation effect, and low thermal damage, making them suitable for treatment, diagnosis, and rehabilitation. Green light sources (522-540nm) are often used in minimally invasive surgery. Green light can enhance the contrast between blood and tissue and improve the clarity of the surgical field of view. Currently, blue laser light sources are relatively rare, mainly semiconductor lasers generated by GaN-based semiconductor laser diodes, covering a wavelength range of 440-470nm, with low difficulty in acquisition and easy to achieve high-power laser output, which can meet applications under different power conditions.

[0009] In summary, how to obtain a three-primary-color continuous light source with good light spot quality, uniform energy distribution and stable power is an urgent problem that technicians in this field need to solve. Summary of the Invention

[0010] In view of this, the present invention provides a red, green and blue three-primary color continuous solid-state laser, which is used to at least solve some of the technical problems in the background technology.

[0011] In order to achieve the above object, the present invention adopts the following technical solutions:

[0012] A red, green and blue primary color continuous solid laser, comprising a blue light semiconductor light source module, a light splitting module, a composite resonant cavity, a 45° beam splitter and a light combining module;

[0013] The blue light semiconductor light source module is used to generate blue light;

[0014] The light splitting module is used to split the generated blue light into two beams, and input them into the composite resonant cavity and the light combining module respectively;

[0015] The composite resonant cavity comprises a blue light input mirror, a Pr:YLF laser crystal, a 640nm output mirror, and a 522nm output mirror, which are sequentially arranged along the optical transmission direction; wherein the blue light input mirror, the Pr:YLF laser crystal, and the 640nm output mirror constitute a red light resonant cavity; and the blue light input mirror, the Pr:YLF laser crystal, and the 522nm output mirror constitute a green light resonant cavity;

[0016] The 45° beam splitter is coated with a 640nm anti-reflection dielectric film and a 522nm high-reflection dielectric film, and is used to split the red light and green light generated by the composite resonant cavity;

[0017] The light combining module is used to combine another beam of blue light with the red light and the green light.

[0018] Preferably, the blue light semiconductor light source module includes a fiber-coupled semiconductor light source with a central wavelength of 444 nm.

[0019] Preferably, the light splitting module includes a 45° semi-transparent and semi-reflective mirror.

[0020] Preferably, the Pr:YLF laser crystal comprises a Pr:YLiF4 crystal with a doping concentration of 0.1-0.5 at.%, and the optical path through the end face of the Pr:YLF crystal is coated with 640nm and 522nm anti-reflection dielectric films.

[0021] Preferably, the 640nm output mirror and the 522nm output mirror are both concave mirrors, and the incident light is input into the concave side of the concave mirror.

[0022] Preferably, the 640nm output mirror is coated with a 640nm partially transparent film and a 522nm anti-reflection film.

[0023] Preferably, the 522nm output mirror is coated with a 640nm antireflection film and a 522nm partial transmission film.

[0024] Preferably, the blue light path further includes a blue light power adjustment module, which is located in front of the light combining module and is a combination structure of a half-wave plate and a Glan prism.

[0025] Preferably, the red light path further includes a blue light power adjustment module, the red light power adjustment module is located in front of the light combining module, and the red light power adjustment module is a combination structure of a filter and a Glan prism.

[0026] Preferably, the green light path further includes a blue light power adjustment module, the green light power adjustment module is located in front of the light combining module, and the green light power adjustment module is a combination structure of a filter and a Glan prism.

[0027] It can be seen from the above technical solution that, compared with the prior art, the present invention provides a red, green and blue three-primary color continuous solid-state laser, which has the following beneficial effects:

[0028] (1) This invention adopts a solid-state laser output scheme with a narrow output linewidth, good monochromaticity, and a wide color gamut. Compared with three-primary-color laser light sources using phosphor powder, this overcomes the defects of large linewidth, poor monochromaticity, and unstable brightness, and achieves high-performance three-primary-color laser light source output synthesis. Compared with the BT.2020 standard, the color gamut coverage of the light source generated by this patent is increased by 12-15%.

[0029] (2) The present invention can directly generate visible laser light using only Pr:YLF crystal without the need for intracavity or extracavity frequency doubling, which makes the optical path simpler and the cost lower.

[0030] (3) Solid-state laser output itself has the characteristics of uniform energy distribution and good spot quality, which overcomes the problems of poor spot quality and narrow application range of semiconductor lasers.

[0031] (4) Continuous laser light source, which can emit light continuously and stably, has uniform light intensity output, and a relatively independent and stable spectrum. It can reflect uniform background light when displaying images, has high color reproduction, and can accurately present the details and colors of the image. Moreover, the peak power of the continuous light source is low, which solves the problem of potential damage to the human eye caused by pulsed laser.

[0032] (5) The present invention can also realize three-primary color energy regulation by adding an energy regulator, thereby achieving light source output of different colors. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0034] Figure 1 This is a schematic diagram of the overall structure of the red, green and blue primary color solid laser provided in Example 1.

[0035] Figure 2 This is the laser output spectrum diagram provided in Example 1.

[0036] Figure 3 This is a schematic diagram of the laser white light output spot provided in Example 1.

[0037] Figure 4 This is a schematic diagram of the multi-color domain output light spot of the laser provided in Example 1.

[0038] Figure 5 This is a schematic diagram of the comparison results between the laser coverage color gamut provided in Example 1 and the BT.2020 standard color gamut.

[0039] Figure 6 This is a schematic diagram of the overall structure of another red, green and blue primary color solid laser provided in Example 2.

[0040] In the figure, 1-fiber coupled semiconductor light source, 2-collimating lens, 3-45° semi-transparent and semi-reflective mirror, 4-45° high-reflective mirror, 5-focusing lens, 6-blue light input mirror, 7-laser crystal, 8-640nm output mirror, 9-522nm output mirror, 10-beam splitter, 11-444nm half-wave plate, 12-Glan prism, 13-beam combiner, 14-filter, 15-45° semi-transparent and semi-reflective mirror. DETAILED DESCRIPTION

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0042] An embodiment of the present invention discloses a red, green and blue (RGB) three-primary color continuous solid-state laser, comprising a blue light semiconductor light source module, a light splitting module, a composite resonant cavity, a power adjustment module and a light combining module. The blue light semiconductor light source module is used to generate blue light. The light splitting module is used to split the generated blue light into two beams, which are respectively input into a laser crystal module and a light combining module. The composite resonant cavity comprises a red light excitation unit and a green light excitation unit, which respectively excite one of the blue light beams to generate red light and green light using a Pr:YLF laser crystal. The power adjustment module is used to achieve power adjustment of the blue light, red light and green light. The light combining module is used to combine the other blue light beam and the red and green light generated by the excitation.

[0043] The present invention is described in detail below through different embodiments.

[0044] Example 1

[0045] The embodiment 1 of the present invention discloses a red, green and blue three-primary color continuous solid laser, such as Figure 1 As shown, a fiber-coupled semiconductor light source 1 with a central wavelength of 444nm is used as both a pump source and a blue light source. A composite resonant cavity is used, and a Pr:YLF laser crystal is selected as the working material to simultaneously achieve 640nm red laser and 522nm green laser output. Specifically, the laser includes: a fiber-coupled semiconductor light source 1, a collimating lens 2, a 45° semi-transparent and semi-reflective mirror 3, a 45° highly reflective mirror 4, a focusing lens 5, a blue light input mirror 6, a laser crystal 7, a 640nm output mirror 8, a 522nm output mirror 9, a 45° beam splitter 10, a 444nm half-wave plate 11, a Glan prism 12, a beam combiner 13, a filter 14, and a 45° semi-transparent and semi-reflective mirror 15.

[0046] In Example 1, the blue light input mirror 6, Pr:YLF laser crystal 7, 640nm output mirror 8, and 522nm output mirror 9 form a nested composite resonant cavity, wherein the blue light input mirror 6, Pr:YLF laser crystal 7, and 640nm output mirror 8 form a red light resonant cavity; the blue light input mirror 6, Pr:YLF laser crystal 7, and 522nm output mirror 9 form a green light resonant cavity.

[0047] In the composite resonant cavity, the 640nm output mirror 8 is a concave mirror with a curvature of 50mm, coated with a 640nm partially transparent film (T=1-10%) and a 522nm anti-reflection film (R<0.1%); the 522nm output mirror 9 is a concave mirror with a curvature of 50mm, coated with a 640nm anti-reflection film (R<0.1%) and a 522nm partially transparent film (T=1-10%).

[0048] The specific structure of the present invention is further described below.

[0049] The fiber-coupled semiconductor light source 1 has a central wavelength of 444nm and a core diameter of 105μm. The collimating lens 2 is a plano-convex lens coated with a 444nm anti-reflection coating and has a curvature of 10mm, which collimates the blue light into a parallel beam. The 45-degree semi-transparent and semi-reflective mirror 3 splits the collimated blue light into two beams, one for pumping the laser crystal and the other as the blue light source. The half-wave plate 11 and the Glan prism 12 form a blue light optical path energy regulator. The half-wave plate 11 converts the blue light into linearly polarized light, and the Glan prism 12 is used to adjust the energy level. The blue light is combined with the red and green light beams through the beam combiner 13.

[0050] The 45° high-reflection mirror 4 is coated with a 45° 444nm high-reflection dielectric film, which reflects the blue light to the focusing lens 5; the focusing lens 5 is coated with a 444nm anti-reflection film with a curvature of 20mm, and focuses the pump light onto the surface of the laser crystal 7; the composite resonant cavity includes a red light excitation unit and a green light excitation unit, which share a blue light input mirror 6 and a laser crystal 7; the blue light input mirror 6 is coated with a 444nm anti-reflection dielectric film (R<0.1%) and a 522nm and 640nm high-reflection dielectric film (R>99.9%); the laser crystal 7 is an a-cut Pr:YLiF4 crystal with a doping concentration of 0.1-0.5at.%, a light-transmitting cross section of 2mm×2mm, a length of 10-20mm, a double-sided polished light-transmitting cross section, and coated with 640nm and 522nm anti-reflection dielectric films (R<0.1%); the 640nm output mirror 8, the 522nm The specific coating of the nm output mirror 9 refers to the previous introduction; the beam splitter 10 is used to split the red light and the green light, and is coated with a 45° 640nm anti-reflection dielectric film (R<0.1%) and a 522nm high-reflection dielectric film (R>99.9%). In addition, the beam splitter 10 also serves as a 45° full-reflection mirror for green light, used to reflect the green light to the beam combiner 13; the green and red light power adjustment module consists of a filter 14 and a Glan prism 12; the filter 14 is coated with 640nm and 522nm anti-reflection dielectric films (R<0.1%) and a 444nm high-reflection dielectric film (R>99.9%); the 45° semi-transparent semi-reflective mirror 15 is used to combine the red light and the green light into one beam, and is coated with a 522nm anti-reflection dielectric film (R<0.1%) and a 640nm high-reflection dielectric film (R>99.9%); finally, the output of the red, green and blue primary color light source is realized through the beam combiner.

[0051] The wavelengths of the three primary colors of red, green, and blue that can be produced are 640nm, 522nm, and 444nm respectively.

[0052] The power regulation module of the laser described in Example 1. In the blue light path, the power regulation module consists of a 444nm half-wave plate and a Glan prism. The half-wave plate converts unpolarized blue light into linearly polarized light, while the Glan prism acts as an analyzer. According to Malus's law, after linearly polarized light with a power intensity of I0 passes through the analyzer, the formula for calculating the transmitted light intensity I is shown in Equation (1).

[0053] I=I0 cos 2 θ (1)

[0054] Where θ is the angle between the incident light's polarization direction and the analyzer's polarization direction. Therefore, rotating the Glan prism to adjust its polarization direction changes the transmitted light's power intensity. In the red and green light paths, the red and green lasers are inherently linearly polarized and perpendicular to each other. Since the power adjustment module consists solely of the Glan prism, power adjustment can be achieved directly by adjusting its polarization direction.

[0055] Figure 2 This is the laser output spectrum of the laser described in Example 1, including three spectral lines: 444nm, 522nm and 640nm.

[0056] When the laser shown in Example 1 outputs 444nm, 522nm, and 640nm at the same time, white light output can be achieved by fine-tuning the power ratio of the three light sources, as shown in FIG. Figure 3 shown.

[0057] The laser shown in Example 1 has different color ranges outputting light spots as shown in FIG. Figure 4 Turn off the blue light and fine-tune the power ratio of red and green light. When the power ratio of red to green light is 1.0, the yellow light output shown in the figure can be achieved. When the power ratio of red to green light is between 0.0-1.0, the orange light output can be achieved. Turn off the red light and fine-tune the power ratio of green and blue light. When the power ratio of green to blue light is 1.0, the cyan light output shown in the figure can be achieved. Turn off the green light and set the power ratio of red to blue light to 0.5, the purple light output shown in the figure can be achieved. In summary, by adjusting the power ratio of the three light sources of red, green and blue, the light source output of any color range can be achieved.

[0058] The color gamut range covered by the laser shown in Example 1 is similar to the color gamut covered by the BT.2020 standard. Figure 5 Calculations show that the color gamut covered by this patented laser is 13% higher than that of the BT.2020 standard, providing a more comprehensive color display capability.

[0059] Example 2

[0060] Based on the same inventive principle as Example 1, Example 2 of the present invention patent discloses another red, green and blue three-primary color continuous solid-state laser. The difference from Example 1 is that in Example 2, the 45° beam splitter for splitting red light and green light is located inside the composite resonant cavity; the composite resonant cavity as a whole adopts a T-type resonant cavity.

[0061] Specifically, such as Figure 6 As shown, Example 2 also uses a fiber-coupled semiconductor light 1 with a central wavelength of 444 nm as both a pump source and a blue light source; a T-type resonant cavity is used, which is mainly composed of a blue light input mirror 6, a Pr:YLF laser crystal 7, a 45° beam splitter 10 adjacent to the Pr:YLF laser crystal 7, a 640 nm output mirror 8, and a 522 nm output mirror 9; in Example 2, Pr:YLF laser crystal is selected as the working material, and 640 nm red light and 522 nm green light laser output are achieved simultaneously.

[0062] The laser as a whole includes: a fiber-coupled semiconductor light source 1, a collimating lens 2, a 45° semi-transparent and semi-reflective mirror 3, a 45° highly reflective mirror 4, a focusing lens 5, a blue light input mirror 6, a laser crystal 7, a 640nm output mirror 8, a 522nm output mirror 9, a beam splitter 10, a 444nm half-wave plate 11, a Glan prism 12, a beam combiner 13, a filter 14, and a 45° semi-transparent and semi-reflective mirror 15.

[0063] The fiber-coupled semiconductor light source 1 has a central wavelength of 444nm and a core diameter of 105μm. The collimating lens 2 is a plano-convex lens coated with a 444nm anti-reflection coating and has a curvature of 10mm. It collimates the blue light into a parallel beam. The 45° semi-transparent and semi-reflective mirror 3 splits the collimated blue light into two beams, one for pumping the laser crystal and the other as the blue light source. The half-wave plate 11 and the Glan prism 12 form a blue light optical path energy regulator. The half-wave plate 11 converts the blue light into linearly polarized light, and the Glan prism 12 is used to adjust the energy level. The blue light is combined with the red and green light beams by the beam combiner 13.

[0064] The 45° high-reflection mirror 4 is coated with a 45° 444nm high-reflection dielectric film, which reflects the blue light to the focusing lens 5; the focusing lens 5 is coated with a 444nm anti-reflection film with a curvature of 20mm, which focuses the pump light onto the surface of the laser crystal; the red and green laser output resonant cavity is a T-type resonant cavity, which consists of an input mirror 6, a beam splitter 10, a 640nm output mirror 8, and a 522nm output mirror 9; the input mirror 6 is coated with a 444nm anti-reflection dielectric film (R<0.1%) and 522nm, 640nm high reflective dielectric film (R>99.9%); beam splitter 10 is coated with 45° 640nm anti-reflective dielectric film (R<0.1%) and 522nm high reflective dielectric film (R>99.9%); 640nm output mirror 8 is a concave mirror with a curvature of 50mm, coated with a 640nm partial transmittance film (T=1-10%) and a 522nm anti-reflection film (R<0.1%); 522nm output mirror 9 is a concave mirror with a curvature of The laser crystal 9 is a tangential Pr:YLiF4 crystal with a doping concentration of 0.1-0.5 at.%, a light-transmitting cross section of 2 mm × 2 mm, and a length of 10-20 mm. The light-transmitting cross section is polished on both sides and coated with 640 nm and 522 nm anti-reflective dielectric films (R < 0.1%). The filter 14 is coated with 640 nm anti-reflective film. The 45° semi-transparent and semi-reflective mirror 15 is coated with a 522nm and 640nm anti-reflection dielectric film (R<0.1%), and a 444nm high-reflection dielectric film (R>99.9%), and reflects the red light to the beam combiner 13, and finally combines the light at the position of the beam combiner 13 to realize the output of three primary color light sources of red light 640nm, green light 522nm and blue light 444nm.

[0065] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Reference can be made to the common and similar parts between the various embodiments. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the method description.

[0066] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A red, green and blue primary color continuous solid laser, characterized in that: Including blue light semiconductor light source module, light splitting module, composite resonant cavity, 45° beam splitter and light combining module; The blue light semiconductor light source module is used to generate blue light; The light splitting module is used to split the generated blue light into two beams, and input them into the composite resonant cavity and the light combining module respectively; The composite resonant cavity comprises a blue light input mirror, a Pr:YLF laser crystal, a 640nm output mirror, and a 522nm output mirror, which are sequentially arranged along the optical transmission direction; wherein the blue light input mirror, the Pr:YLF laser crystal, and the 640nm output mirror constitute a red light resonant cavity; and the blue light input mirror, the Pr:YLF laser crystal, and the 522nm output mirror constitute a green light resonant cavity; The 45° beam splitter is coated with a 640nm anti-reflection dielectric film and a 522nm high-reflection dielectric film, and is used to split the red light and green light generated by the composite resonant cavity; The light combining module is used to combine another beam of blue light with the red light and the green light.

2. The red, green and blue three-primary color continuous solid-state laser according to claim 1, characterized in that: The blue light semiconductor light source module includes a fiber-coupled semiconductor light source with a central wavelength of 444 nm.

3. The red, green and blue three-primary color continuous solid-state laser according to claim 1, characterized in that: The light splitting module includes a 45° semi-transparent and semi-reflective mirror.

4. The red, green and blue three-primary color continuous solid-state laser according to claim 1, characterized in that: The Pr:YLF laser crystal includes a Pr:YLiF4 crystal with a doping concentration of 0.1-0.5 at.%, and the optical path of the Pr:YLF crystal is plated with 640nm and 522nm anti-reflection dielectric films on the end surface.

5. The red, green and blue three-primary color continuous solid-state laser according to claim 1, characterized in that: The 640nm output mirror and the 522nm output mirror are both concave mirrors, and the incident light is input to the concave side of the concave mirror.

6. The red, green and blue three-primary color continuous solid-state laser according to claim 1, characterized in that: The 640nm output mirror is coated with a 640nm partial transmission film and a 522nm anti-reflection film.

7. The red, green and blue three-primary color continuous solid-state laser according to claim 1, characterized in that: The 522nm output mirror is coated with a 640nm antireflection film and a 522nm partial transmission film.

8. The red, green and blue three-primary color continuous solid-state laser according to claim 1, characterized in that: The blue light path also includes a blue light power adjustment module, which is located in front of the light combining module and is a combination structure of a half-wave plate and a Glan prism.

9. The red, green and blue three-primary color continuous solid-state laser according to claim 1, characterized in that: The red light path also includes a red light power adjustment module, which is located in front of the light combining module. The red light power adjustment module is a combination structure of a filter and a Glan prism.

10. The red, green and blue three-primary color continuous solid-state laser according to claim 1, characterized in that: The green light path also includes a green light power adjustment module, which is located in front of the light combining module. The green light power adjustment module is a combination structure of a filter and a Glan prism.

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