Method and laser for overcoming the limitation on laser light wavelength due to fluorescence spectrum

Abstract

The present invention discloses a method and a laser for breaking through the limitation of the laser light wavelength caused by the fluorescence spectrum, which belongs to the field of laser light. The method includes: using pump light to excite electrons in a laser light gain medium to a high energy level; controlling the design of a laser light resonant cavity to suppress the emission of radiation when the electrons transition from the high energy level to the low energy level; and enhancing the transition probability of the electrons from the high energy level to the electron-phonon coupling energy level when the multi-phonons are coupled by the laser light resonance, thereby realizing the emission and enhancement beyond the fluorescence spectrum and the emission of radiation, and the laser light resonant cavity includes an input mirror, a reflecting mirror, a tuning element, and an output mirror, which are arranged in order along the optical path direction, the laser light gain medium is located between the input mirror and the reflecting mirror in the laser light resonant cavity, and the tuning element is arranged in the laser light resonant cavity at the Brewster angle. The present invention uses the above method and the laser for realizing the above method to break through the limitation of the fluorescence spectrum and obtain a laser light with a new wavelength.

Description

[Technical field]

[0001] The present invention relates to the field of laser light technology, and more particularly to a method and laser that overcomes the limitations on laser light wavelength imposed by the fluorescence spectrum. [Background technology]

[0002] Laser light, as an important artificial light source, plays an important role in important fields related to national economy and national security, different wavelengths of laser light are required for different applications, and the wavelength of the laser light obtained depends on the difference in energy levels during electronic transition. According to Bohr's hydrogen atom model, the energy levels of electrons are quantized and discrete, and are subject to uniform and non-uniform broadening, and a certain broadening can be performed on the spectrum, and the generated laser light can be realized that its wavelength can be continuously adjusted within a certain range by tunable laser light technology. In order to broaden the wavelength of laser light, nonlinear optics and frequency conversion technology have been developed, and based on the wavelength of laser light emission, it has been broadened to many wavelength bands of ultraviolet and infrared, meeting many practical needs, but the basis of the broadening is still the wavelength of laser light, and nonlinear optics and frequency conversion technology is based on the high-order response of electrons in materials to external light fields, and the frequency conversion process relies on the nonlinear polarizability of materials, which is often several orders of magnitude smaller than the linear polarizability, so the power density of the incident light field is required to be relatively large. The efficiency of nonlinear frequency conversion is also dependent on the effects and limitations of phase matching, walk-off, temperature, etc., and the design and application of wavelength broadening devices are relatively high. Therefore, nonlinear frequency conversion technology has an incomparable advantage in directly broadening the wavelength of laser light in the laser light emission process and realizing the quantum "cut" of the electronic transition process, and nonlinear optics and frequency conversion technology can provide a basic light source to further broaden the wavelength of laser light.

[0003] However, as described in Bohr's hydrogen atom model, the quantized orbit of electrons determines the discreteness of the fluorescence spectrum and limits the wavelength of the laser light that can be obtained. Therefore, how to break through the limitations of the fluorescence spectrum to obtain laser light with a new wavelength is an important technical issue in this technical field. Summary of the Invention

[0004] In view of the above, the present invention provides a method and a laser that breaks through the limitation on the laser light wavelength caused by the fluorescence spectrum to solve the technical problems existing in the background art.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions.

[0006] According to one aspect, the present invention discloses a method for breaking through the limitation of laser light wavelength caused by fluorescence spectrum, the method includes: a laser light gain medium causes electrons to transition to a high energy level by excitation of pump light; a plating film of a laser light resonant cavity is controlled to suppress the emission of radiation when electrons transition from a high energy level to a low energy level; and the transition probability of electrons from a high energy level to an electron-phonon coupling energy level when multiphonons are coupled is enhanced by laser light resonance, thereby realizing light emission and enhancement beyond the fluorescence spectrum and realizing the emission of radiation; the laser light resonant cavity includes an input mirror, a reflecting mirror, a tuning element, and an output mirror, which are arranged in order along the optical path direction; the laser light gain medium is located between the input mirror and the reflecting mirror in the laser light resonant cavity; and the tuning element is arranged in the laser light resonant cavity at Brewster's angle.

[0007] Preferably, the laser light gain medium causes electrons to transition to a higher energy level upon excitation by pump light, specifically, The method includes injecting pump light provided by a pump source into the laser optical gain medium after focusing with a focusing system to excite electrons to transition to a higher energy level.

[0008] The laser light resonant cavity plating film is used to suppress the emission of radiated light when electrons transition from a high energy level to a low energy level, and the transition probability from the high energy level of electrons to the electron-phonon coupling energy level when multiphonons are coupled is enhanced by the laser light resonance, thereby realizing light emission and enhancement that breaks through the fluorescence spectrum and realizing the emission of radiated light, specifically, as follows: When the wavelength of the pump light is 976 nm, the laser light gain medium includes a rare earth salt crystal of oxycalcium borate with an ytterbium ion doping concentration of 1 at%-30 at%, the surface of the crystal of the laser light gain medium is polished and plated with a gain medium film having high transmittance for the 1000 nm-1500 nm wavelength band; The incident mirror is plated with a medium film A that is highly transmissive for the 900-1100 nm wavelength band and highly reflective for the 1100-1500 nm wavelength band; The reflective mirror is plated with a medium film B that is highly transparent in the 900-1100 nm wavelength band and totally reflective in the 1100-1500 nm wavelength band; The exit mirror includes a plated medium film C that is highly transmissive for the 900-1100 nm wavelength band and partially reflective for the 1100-1200 nm wavelength band, a plated medium film C that is highly transmissive for the 900-1200 nm wavelength band and partially reflective for the 1200-1300 nm wavelength band, or a plated medium film C that is highly transmissive for the 900-1400 nm wavelength band and partially reflective for the 1400-1500 nm wavelength band.

[0009] The laser light resonant cavity plating film is used to suppress the emission of radiation when electrons transition from a high energy level to a low energy level, and the transition probability from the high energy level of electrons to the electron-phonon coupling energy level when multiphonons are coupled is enhanced by the laser light resonance, thereby realizing light emission and enhancement that breaks through the fluorescence spectrum and realizing the emission of radiation. When the wavelength of the pump light is 532 nm, the laser light gain medium includes a titanium gem crystal with a doping concentration of 0.1 at%-5 at%, the surface of the crystal of the laser light gain medium is polished, and the incident light is incident on the surface of the crystal of the laser light gain medium at Brewster's angle; The incident mirror is plated with a medium film A that is highly transmissive for the 500-1100 nm wavelength band and highly reflective for the 1100-1500 nm wavelength band; The reflective mirror is plated with a medium film B that is highly transparent in the 500-1100 nm wavelength band and totally reflective in the 1100-1500 nm wavelength band; The exit mirror further includes being plated with a medium film C that is highly transmissive for the 500-1100 nm wavelength band and partially reflective for the 1100-1200 nm wavelength band, or being plated with a medium film C that is highly transmissive for the 500-1200 nm wavelength band and partially reflective for the 1200-1300 nm wavelength band, or being plated with a medium film C that is highly transmissive for the 500-1400 nm wavelength band and partially reflective for the 1400-1500 nm wavelength band.

[0010] The laser light resonant cavity plating film is used to suppress the emission of radiation when electrons transition from a high energy level to a low energy level, and the transition probability from the high energy level of electrons to the electron-phonon coupling energy level when multiphonons are coupled is enhanced by the laser light resonance. When the wavelength of the pump light is 795 nm, the laser light gain medium includes a yttrium aluminum garnet crystal with a thulium doping concentration of 0.1 at%-20 at%, and the surface of the crystal of the laser light gain medium is polished and plated with a medium film that is highly transparent to the 795 nm and 1800-2100 nm wavelength bands; The entrance mirror is plated with a medium film A that is highly transmissive to the 795 nm and 1800-2100 nm wavelength bands and highly reflective to the 2100-2500 nm wavelength band; The reflective mirror is plated with a medium film B that is highly transmissive for the 795 nm and 1800-2100 nm wavelength bands and totally reflective for the 2100-2500 nm wavelength band; The exit mirror further includes a medium film C plated thereon that is highly transmissive for 795 nm and 1800-2100 nm and partially reflective for 2100-2500 nm.

[0011] According to another aspect, the present invention discloses a laser for realizing a method for breaking through the limitation of laser light wavelength due to the fluorescence spectrum, the laser includes a pump source, an entrance mirror, a laser light gain medium, a reflection mirror, a tuning element, and an exit mirror arranged in sequence along an optical path direction, the pump source is used to emit pump light, the entrance mirror, the reflection mirror, and the exit mirror constitute a laser light resonant cavity, the laser light resonant cavity is used to control to suppress the oscillation of emitted light when an electron transitions from a high energy level to a low energy level, and to enhance the transition probability from the high energy level of an electron to an electron-phonon coupling energy level when multi-phonons are coupled by laser light resonance, and the tuning element is installed in the laser light resonant cavity at the Brewster angle.

[0012] Preferably, a focusing system is further provided between the pump source and the entrance mirror.

[0013] Preferably, the tuning element comprises a birefringent filter or a prism.

[0014] Preferably, in order to improve the transmission efficiency of the laser light, the surface of the laser light gain medium is plated with a medium film that is highly transmissive to a specific wavelength band.

[0015] Interpretation of terms in this invention: High reflectivity means that the reflectance of incident light of a specific wavelength or wavelength band is greater than 99%. High transmittance means that the transmittance for a specific wavelength or wavelength band is greater than 99%. Partial reflection means that the reflectance for a particular wavelength or band of light is between 80%-99.9%.

[0016] As can be seen from the above technical solutions, the present invention provides a method and laser that breaks through the limitation of laser light wavelength caused by fluorescence spectrum, and has the following beneficial effects compared with the prior art:

[0017] The present invention uses a laser light resonant cavity plating film to control and suppress the oscillation of radiation light when electrons transition from a high energy level to a low energy level, and also enhances the probability of transition from the high energy level of electrons to the electron-phonon coupling energy level when multi-phonons are coupled; that is, by plating a medium film that is highly transmissive, highly reflective, or partially transmissive for a specific wavelength band on the surfaces of the input mirror, reflecting mirror, and output mirror of the laser light resonant cavity, and combining it with a laser light gain medium and a tuning element, it is possible to further break through the fluorescence spectrum limitations and obtain laser light with a new wavelength. [Brief description of the drawings]

[0018] In order to more clearly describe the technical solutions of the embodiments of the present invention or the prior art, the following briefly introduces drawings that need to be used in the description of the embodiments or the prior art. It is obvious that the drawings in the following description are only embodiments of the present invention, and those skilled in the art can also obtain other drawings based on the drawings provided without exerting creative efforts. [Figure 1] 1 is a schematic structural diagram of a laser according to the present invention; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] The following clearly and completely describes the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention, and obviously, the described embodiments are only some of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained based on the embodiments of the present invention without the creative efforts of those skilled in the art are all within the scope of protection of the present invention.

[0020] According to one aspect of the embodiment of the present invention, a method for breaking through the limitation of laser light wavelength caused by fluorescence spectrum is disclosed, the method includes: a laser light gain medium causes electrons to transition to a high energy level by excitation of pump light; a plating film of a laser light resonant cavity is controlled to suppress the emission of radiation light when the electrons transition from the high energy level to the low energy level; and the transition probability of the electrons from the high energy level to the electron-phonon coupling energy level when the multiphonons are coupled is enhanced by the laser light resonance, thereby realizing light emission and enhancement beyond the fluorescence spectrum and realizing the emission of radiation light; the laser light resonant cavity includes an input mirror, a reflecting mirror, a tuning element, and an output mirror, which are arranged in order along the optical path direction; the laser light gain medium is located between the input mirror and the reflecting mirror in the laser light resonant cavity; and the tuning element is arranged in the laser light resonant cavity at a Brewster angle.

[0021] The pump light may be provided by a pump source, and the method includes a step of injecting the pump light emitted from the pump source into the laser optical gain medium after focusing with a focusing system to excite electrons to transition to a higher energy level.

[0022] The present invention utilizes the mode selection process of laser light through the physical effect of electron-phonon coupling, and realizes stimulated emission of electrons in the presence of multi-phonons, thereby breaking through the traditional thinking and design concept in which the laser light wavelength is limited by the fluorescent emission envelope of the gain medium; specifically, the laser light can be controlled by a plated film in the resonant cavity.

[0023] The following describes in detail the method steps of the present invention through different examples. EXAMPLES

[0024] The wavelength of the pump light emitted from the pump source is 976 nm, and a semiconductor laser can be selected as the pump source; the focusing system is composed of a pair of convex lenses with a focal length ratio of 1:1; the laser light gain medium is an oxycalcium borate rare earth salt crystal with an ytterbium ion doping concentration of 15 at %, and the surface of the crystal is polished and plated with a medium film having high transmittance for 1000 nm-1500 nm; The laser light resonant cavity is composed of an input mirror plated with a medium film A, a folding mirror plated with a medium film B, and an output mirror plated with a medium film C, the input mirror being plated with a medium film A that is highly transmissive for 900-1100 nm and highly reflective for 1100-1500 nm; The reflective mirror is plated with a medium film B that is highly transmissive for 900-1100 nm and totally reflective for 1100-1500 nm. The output mirror is plated with a medium film C that is highly transparent for 900-1100 nm and partially reflective for 1100-1200 nm, and the tuning element is a birefringent filter arranged at Brewster's angle, and by rotating the tuning element, it is possible to realize the output of the tuned laser light with a wavelength of 1100-1200 nm; If the output mirror is changed to one plated with a medium film C that is highly transmissive for 900-1200 nm and partially reflective for 1200-1300 nm, then by rotating the tuning element, it is possible to output a tuned laser light with a wavelength of 1200-1300 nm; if the output mirror is changed to one plated with a medium film C that is highly transmissive for 900-1300 nm and partially reflective for 1300-1400 nm, then by rotating the tuning element, it is possible to output a tuned laser light with a wavelength of 1300-1400 nm; If the output mirror is changed to one plated with a medium film C that is highly transmissive for 900-1400 nm and partially reflective for 1400-1500 nm, then by rotating the tuning element, it is possible to output a tuned laser light with a wavelength of 1400-1500 nm. EXAMPLES

[0025] The wavelength of the pump light emitted from the pump source is 532 nm, and an all-solid-state laser can be selected as the pump source; the focusing system is composed of one convex lens with a focal length of 50 mm; the laser light gain medium is a titanium gemstone crystal with a doping concentration of 0.5 at%, and the surface of the crystal is polished and disposed in the resonant cavity at the Brewster angle; The laser light resonant cavity is composed of an entrance mirror plated with a medium film A, a reflection mirror plated with a medium film B, and an exit mirror plated with a medium film C, the entrance mirror is plated with a medium film A that is highly transmissive for 500-1100 nm and highly reflective for 1100-1500 nm, The reflective mirror is plated with a medium film B that is highly transmissive for 500-1100 nm and totally reflective for 1100-1500 nm. The output mirror is plated with a medium film C that is highly transparent for 500-1100 nm and partially reflective for 1100-1200 nm, and the tuning element is a birefringent filter arranged at Brewster's angle, and by rotating the tuning element, it is possible to realize the output of the tuned laser light with a wavelength of 1100-1200 nm; If the output mirror is changed to one plated with a medium film C that is highly transmissive for 500-1200 nm and partially reflective for 1200-1300 nm, then by rotating the tuning element, it is possible to output a tuned laser light with a wavelength of 1200-1300 nm; if the output mirror is changed to one plated with a medium film C that is highly transmissive for 500-1300 nm and partially reflective for 1300-1400 nm, then by rotating the tuning element, it is possible to output a tuned laser light with a wavelength of 1300-1400 nm; If the output mirror is changed to one plated with a medium film C that is highly transmissive for 500-1400 nm and partially reflective for 1400-1500 nm, then by rotating the tuning element, it is possible to output a tuned laser light with a wavelength of 1400-1500 nm. EXAMPLES

[0026] The wavelength of the pump light emitted from the pump source is 795 nm, the pump source is a semiconductor laser, the focusing system is a pair of convex lenses with a focal length ratio of 1:1, the laser light gain medium is a yttrium aluminum garnet crystal with a thulium doping concentration of 10 at %, the surface of the crystal is polished and plated with a medium film that is highly transparent to 795 nm and 1800-2100 nm, The laser light resonant cavity is composed of an input mirror plated with a medium film A, a folding mirror plated with a medium film B, and an output mirror plated with a medium film C, the input mirror being plated with a medium film A that is highly transmissive to 795 nm and 1800-2100 nm and highly reflective to 2100-2500 nm; The reflective mirror is plated with a medium film B that is highly transmissive for 795 nm and 1800-2100 nm and totally reflective for 2100-2500 nm. The exit mirror is plated with a medium film C that is highly transmissive for 795 nm and 1800-2100 nm and partially reflective for 2100-2500 nm, and the tuning element is a prism arranged at Brewster's angle, and by rotating the tuning element it is possible to achieve a wavelength output from the tuned laser light of 2100-2500 nm. EXAMPLES

[0027] The wavelength of the pump light emitted from the pump source is 1.6 μm, the pump source is a fiber laser with a fiber aperture of 200 μm, the focusing system is composed of a pair of convex lenses with a focal length ratio of 1:1, the laser light gain medium is a Cr:ZnS crystal with a doping concentration of 1018 / cm3, the surface of the crystal is polished and plated with a medium film that is highly transparent to 1600 and 2400-2800 nm, The laser optical resonant cavity is composed of an input mirror plated with a medium film A, a folding mirror plated with a medium film B, and an exit mirror plated with a medium film C, The entrance mirror is plated with a medium film A that is highly transmissive for 1600 nm and 2400-2800 nm and highly reflective for 2800-3000 nm. The reflective mirror is plated with a medium film B that is highly transmissive at 1600 nm and 2400-2800 nm and highly reflective at 2800-3000 nm, and totally reflective; The exit mirror is plated with a medium film C that is highly transmissive for 1600 nm and 2400-2800 nm and partially reflective for 2800-3000 nm, and the tuning element is a prism arranged at Brewster's angle, and by rotating the tuning element it is possible to output a tuned laser light with a wavelength of 2800-3000 nm. EXAMPLES

[0028] The wavelength of the pump light emitted from the pump source is 1.0795 μm, the pump source is a Nd:YAP laser, the focusing system is composed of one convex lens with a focal length of 50 mm, the laser light gain medium is a NaCl(OH-):F2+ color center laser photonic crystal, the crystal is arranged at Brewster's angle in a light-transmitting crystal chamber cooled by liquid nitrogen, the crystal chamber is maintained in a vacuum, the surface of the crystal is polished and plated with a medium film that is highly transparent to 1080 and 1400-1800 nm, The laser light resonant cavity is composed of an entrance mirror plated with a medium film A, a reflection mirror plated with a medium film B, and an exit mirror plated with a medium film C, and the entrance mirror is plated with a medium film A that is highly transmissive to 1080 nm and 1400-1800 nm and highly reflective to 1800-2000 nm, The reflective mirror is plated with a medium film B that is highly transmissive at 1080 nm and 1400-1800 nm and highly reflective at 1800-2000 nm, and totally reflective; The exit mirror is plated with a medium film C that is highly transmissive for 1080 nm and 1400-1800 nm and partially reflective for 1800-2000 nm, and the tuning element is a prism arranged at Brewster's angle, and by rotating the tuning element it is possible to output a tuned laser light with a wavelength of 1800-2000 nm.

[0029] In an embodiment of the present invention, an element is arranged at Brewster's angle means that a ray is incident on the entrance interface of this element at Brewster's angle; In the present embodiment, media film, media film A, media film B, and media film C are used only to distinguish the media films plated on different optical components.

[0030] As shown in FIG. 1, another embodiment of the present invention discloses a laser for realizing a method of breaking through the limitation of laser light wavelength caused by the fluorescence spectrum, the laser includes a pump source 1, a focusing system 2, an entrance mirror 4 plated with a medium film A, a laser light gain medium 3, a reflecting mirror 5 plated with a medium film B, a tuning element 7, and an exit mirror 6 plated with a medium film C, which are arranged in sequence along the optical path direction. The pump source 1 is used to emit pump light of different wavelength bands, and the entrance mirror 4 plated with a medium film A, the medium The reflection mirror 5 plated with the medium film B and the exit mirror 6 plated with the medium film C form a laser light resonant cavity, which is used to control the oscillation of emitted light when electrons transition from a high energy level to a low energy level so as to suppress the oscillation, and to enhance the transition probability from the high energy level of electrons to the electron-phonon coupling energy level when multi-phonons are coupled by laser light resonance. The laser light reflected by the reflection mirror 5 plated with the medium film B is incident on the entrance interface of the tuning element 7 at the Brewster angle.

[0031] The tuning element 7 includes a birefringent filter or a prism.

[0032] In another embodiment, in order to improve the transmission efficiency of the laser light, the surface of the laser light gain medium 3 is plated with a medium film that is highly transmissive to a specific wavelength band.

[0033] In an embodiment, the gain medium is a laser optical gain medium with electron-phonon coupling effect, which may be, but is not limited to, a single crystal or polycrystalline material capable of providing lattice oscillation, such as laser photocrystals or laser photoceramics doped with transition metals, rare earth luminescent ions, color centers, etc.

[0034] Each embodiment in this specification will be described step by step, and the main points of each embodiment will be described will be the differences between the other embodiments, and the similarities between the embodiments can be referred to each other. The apparatuses disclosed in the embodiments correspond to the methods disclosed in the embodiments, and therefore the description is relatively simple, and the relevant parts can be referred to the description of the method.

[0035] The above description of the disclosed embodiments enables one skilled in the art to realize or use the present invention. Various modifications to these embodiments will be apparent to those 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. Thus, the present invention is not intended to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein. [Explanation of symbols]

[0036] 1 pump source, 2 focusing system, 3 laser light gain medium, 4 input mirror plated with medium film A, 5 folding mirror plated with medium film B, 6 output mirror plated with medium film C, 7 tuning element

Claims

1. A method for overcoming the limitation of laser light wavelength due to the fluorescence spectrum, comprising: a laser light gain medium causing electrons to transition to a higher energy level by excitation with pump light, a plating film on the laser light resonant cavity controlling the laser light to suppress the emission of radiation when the electrons transition from the higher energy level to the lower energy level, and enhancing the probability of the electrons transitioning from the higher energy level to the electron-phonon coupling energy level when multiphonons are coupled by the laser light resonance, thereby realizing light emission and enhancement that breaks through the fluorescence spectrum and realizing the emission of radiation, wherein the laser light resonant cavity includes an entrance mirror, a reflecting mirror, a tuning element, and an exit mirror that are arranged in this order along the optical path direction, the laser light gain medium being located between the entrance mirror and the reflecting mirror in the laser light resonant cavity, and the tuning element being arranged in the laser light resonant cavity at a Brewster angle.

2. Specifically, the laser light gain medium causes electrons to transition to a higher energy level by pumping light. A method for overcoming limitations on laser light wavelengths due to fluorescence spectra, as described in claim 1, characterized in that it includes a step of injecting pump light provided from a pump source into a laser light gain medium after focusing it with a focusing system, thereby exciting electrons to transition to a higher energy level.

3. The laser light resonant cavity plating film is used to suppress the emission of radiated light when electrons transition from a high energy level to a low energy level, and the transition probability from the high energy level of electrons to the electron-phonon coupling energy level when multiphonons are coupled is enhanced by the laser light resonance, thereby realizing light emission and enhancement that breaks through the fluorescence spectrum and realizing the emission of radiated light, specifically, as follows: When the wavelength of the pump light is 976 nm, the laser light gain medium includes a rare earth salt crystal of oxycalcium borate with an ytterbium ion doping concentration of 1 at%-30 at%, the surface of the crystal of the laser light gain medium is polished and plated with a medium film having high transmittance for the 1000 nm-1500 nm wavelength band; The entrance mirror is plated with a medium film A that is highly transmissive for the 900-1100 nm wavelength band and highly reflective for the 1100-1500 nm wavelength band; The reflecting mirror is plated with a medium film B that is highly transmissive for the 900-1100 nm wavelength band and totally reflective for the 1100-1500 nm wavelength band; The method for overcoming the limitation of the laser light wavelength due to the fluorescence spectrum according to claim 1, characterized in that the exit mirror is plated with a medium film C that is highly transparent for the 900-1100 nm wavelength band and partially reflective for the 1100-1200 nm wavelength band, or is plated with a medium film C that is highly transparent for the 900-1200 nm wavelength band and partially reflective for the 1200-1300 nm wavelength band, or is plated with a medium film C that is highly transparent for the 900-1400 nm wavelength band and partially reflective for the 1400-1500 nm wavelength band.

4. The laser light resonant cavity plating film is used to suppress the emission of radiated light when electrons transition from a high energy level to a low energy level, and the transition probability from the high energy level of electrons to the electron-phonon coupling energy level when multiphonons are coupled is enhanced by the laser light resonance, thereby realizing light emission and enhancement that exceeds the fluorescence spectrum, and realizing the emission of radiated light. When the wavelength of the pump light is 532 nm, the laser light gain medium includes a titanium gem crystal with a doping concentration of 0.1 at%-5 at%, the surface of the crystal of the laser light gain medium is polished, and the incident light is incident on the surface of the crystal of the laser light gain medium at Brewster's angle; The entrance mirror is plated with a medium film A that is highly transmissive for the 500-1100 nm wavelength band and highly reflective for the 1100-1500 nm wavelength band; The reflecting mirror is plated with a medium film B that is highly transmissive for the 500-1100 nm wavelength band and totally reflective for the 1100-1500 nm wavelength band; The method for overcoming the limitation on the laser light wavelength due to the fluorescence spectrum according to claim 1, further comprising: plating the exit mirror with a medium film C that is highly transparent for the 500-1100 nm wavelength band and partially reflective for the 1100-1200 nm wavelength band; plating the exit mirror with a medium film C that is highly transparent for the 500-1200 nm wavelength band and partially reflective for the 1200-1300 nm wavelength band; or plating the exit mirror with a medium film C that is highly transparent for the 500-1400 nm wavelength band and partially reflective for the 1400-1500 nm wavelength band.

5. The laser light resonant cavity plating film is used to suppress the emission of radiated light when electrons transition from a high energy level to a low energy level, and the transition probability from the high energy level of electrons to the electron-phonon coupling energy level when multiphonons are coupled is enhanced by the laser light resonance, thereby realizing light emission and enhancement that exceeds the fluorescence spectrum, and realizing the emission of radiated light. When the wavelength of the pump light is 795 nm, the laser light gain medium includes a yttrium aluminum garnet crystal with a thulium doping concentration of 0.1 at%-20 at%, and the surface of the crystal of the laser light gain medium is polished and plated with a medium film that is highly transparent to the 795 nm and 1800-2100 nm wavelength bands; The entrance mirror is plated with a medium film A that is highly transmissive for the 795 nm and 1800-2100 nm wavelength bands and highly reflective for the 2100-2500 nm wavelength band; The method for overcoming the limitation on the laser light wavelength due to the fluorescence spectrum described in claim 1 further includes: a reflecting mirror is plated with a medium film B that is highly transmissive for the 795 nm and 1800-2100 nm wavelength bands and totally reflective for 2100-2500 nm; and an exit mirror is plated with a medium film C that is highly transmissive for 795 nm and 1800-2100 nm and partially reflective for 2100-2500 nm.

6. A laser for realizing the method for breaking through the limitation on the laser light wavelength due to the fluorescence spectrum according to any one of claims 1 to 5, comprising: The laser includes a pump source, an entrance mirror, a laser light gain medium, a reflection mirror, a tuning element, and an exit mirror, which are arranged in order along an optical path direction, the pump source is used to emit pump light, the entrance mirror, the reflection mirror, and the exit mirror constitute a laser light resonant cavity, the laser light resonant cavity is controlled to suppress oscillation of emitted light when an electron transitions from a high energy level to a low energy level, and is used to enhance the transition probability from the high energy level of an electron to an electron-phonon coupling energy level when multi-phonons are coupled by laser light resonance, and the tuning element is installed in the laser light resonant cavity at a Brewster angle.

7. 7. The laser for breaking through the limitation on the laser light wavelength due to the fluorescence spectrum as claimed in claim 6, further comprising a focusing system disposed between the pump source and an entrance mirror.

8. 7. A laser for breaking through limitations on laser light wavelength due to fluorescence spectrum, as claimed in claim 6, characterized in that the tuning element includes a birefringent filter or a prism.

9. 7. A laser that breaks through the limitations on laser light wavelengths imposed by fluorescence spectra, as described in claim 6, characterized in that a medium film that is highly transparent to a specific wavelength band is plated on the surface of the laser light gain medium.

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