CN214280414U - Device for generating ultraviolet laser by frequency doubling in cavity of visible light waveband fiber laser - Google Patents
Device for generating ultraviolet laser by frequency doubling in cavity of visible light waveband fiber laser Download PDFInfo
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- CN214280414U CN214280414U CN202022765055.5U CN202022765055U CN214280414U CN 214280414 U CN214280414 U CN 214280414U CN 202022765055 U CN202022765055 U CN 202022765055U CN 214280414 U CN214280414 U CN 214280414U
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Abstract
The utility model discloses a visible light wave band fiber laser intracavity doubling of frequency produces ultraviolet laser's device, including fundamental frequency fiber laser system, doubling of frequency system, optical coupling system. The fundamental frequency fiber laser system is used for generating fundamental frequency light, the frequency doubling crystal is arranged in a cavity of the fundamental frequency fiber laser system, and the pair of ultraviolet aspheric lens groups focus the fundamental frequency light in the cavity on the crystal to provide larger fundamental frequency light power density and generate ultraviolet band frequency doubling laser. The utility model discloses utilize nonlinear crystal to the fundamental frequency light frequency doubling of multiple visible light wave band, obtained at 240 and supplementarily tunable continuous ultraviolet laser of 288nm wave band. The utility model discloses by the direct intracavity frequency doubling production ultraviolet laser of visible light wave band fiber laser, solved the tradition and had structure complicacy, the light beam quality is relatively poor, be difficult to the miniaturization and maintain the scheduling problem through the frequency doubling production ultraviolet laser of all solid-state ultraviolet laser.
Description
Technical Field
The utility model relates to a laser instrument field, in particular to nonlinear frequency conversion fiber laser.
Background
Ultraviolet laser has wide application in the fields of optical data storage, lithography, microelectronics, atmospheric sounding, micromachining, biomedicine and the like, and has unique advantages compared with long-wave laser. The processing mode that the ultraviolet laser adopts local heating to melt substances is different from an infrared or visible light wave band, the chemical bond connecting atomic components of the substances is directly damaged, and the process of separating the substances into atoms is completed under the condition of low temperature, so that the processing mode has better edge strength and fine processing capability, and has a position which is difficult to replace in the fields of micro-processing and microelectronics. Traditional ultraviolet laser mainly divide into gas laser and all solid-state ultraviolet laser, and the utility model discloses a technique that the direct two multiples of visible light fiber laser of Laser Diode (LD) pumping produced ultraviolet laser has characteristics such as efficient, miniaturized, better light beam quality and need not the maintenance cost.
The fiber laser is composed of a pumping source, a gain fiber, a resonant cavity and the like. Human eyes are particularly sensitive to laser light in the visible light band, so that the human eyes play an important role in the research and application fields of laser light. Visible light laser sources have wide applications in biomedicine, data storage, visible light communication, laser processing, celestial physics, and the like. Since the approaches for generating visible light laser mainly adopt the nonlinear frequency conversion technology (such as frequency multiplication, sum frequency and parameter processes) of an all-solid-state laser/dye laser, the disadvantages of high cost, complex system, difficult heat dissipation, relatively poor beam quality and the like exist, so that the visible light laser is generated by adopting direct transition of rare earth ions, and the advantages of compact structure, no heat dissipation, good beam quality, maintenance-free performance and the like of the fiber laser are exerted, and the method is considered to be an ideal choice for generating high-performance visible light laser. However, the conventional fiber laser has problems that miniaturization is difficult (a large number of block-shaped fiber components are used) and the output power of the visible laser is low. The utility model provides a high power fiber laser of compact all-fiber structure realizes all-fiber miniaturization, high power, high performance, low-cost fundamental frequency laser system as this innovation scheme of fundamental frequency light of doubling of frequency ultraviolet laser.
The rare earth element is a collective name of 17 metal elements in total of scandium (Sc), yttrium (Y) and lanthanum (La) group III elements in the periodic table. Along with the doping of rare earth ions (Dy)3+、Pr3+、Ho3+、Tm3+) The intensive research on optical fibers and the maturity of manufacturing processes are considered to be one of the effective ways to efficiently down-convert visible laser light. To obtain highly efficient converted visible lasers, fluoride-host fibers (e.g., ZBLAN) are the dominant choice for rare-earth doped visible fiber lasers due to their low phonon energy. Dy doped3+Dy absorbing ultraviolet or blue light in fluoride optical fiber3+After ions jump to high energy level, they fall down after relaxation4F9/2At an energy level, through4F9/2→6H13/2The fluorescence of about 565-; doped Pr3+Pr absorbing near infrared or blue light in fluoride optical fiber3+After ions jump to high energy level, they fall down after relaxation3P1At an energy level, through3P1→3H5Generating the fluorescence of about 491-520nm, which can generate the very strong 491-520nm green light gain; ho doping3+Red light absorbing Ho in fluoride fiber3+After ions jump to high energy level, they fall down after relaxation5F4At an energy level, through5F4→5I8Generating fluorescence of about 540-; tm doping3+Absorption of near infrared or red Tm in fluoride fiber3+After ion transition to high energy level, relaxationThen fall down to1G4At an energy level, through1G4→3H6Producing fluorescence at about 483-485nm, a process that produces a very strong 483 → 485nm blue gain. Compared with the traditional frequency doubling/sum frequency technology, the frequency down-conversion technology has the advantages of higher efficiency and compactness in yellow laser generation. Although it has been reported in the early days that the pumping rare earth ion doped fluoride fiber generates visible laser, the power of the generated visible laser is still low, and the fundamental frequency light power required by frequency doubling ultraviolet is not yet met. The utility model discloses found miniaturized all-fiber visible light laser as fundamental frequency light, and realized watt level high power visible light laser output.
Nonlinear frequency conversion technology, the utility model discloses as one of core device among the laser technology with nonlinear optics crystal, have extensive application in fields such as laser communication, laser guidance, laser marking, precision finishing. When the fundamental frequency light is incident on the nonlinear optical crystal, the nonlinear effect can be excited under the condition of meeting the phase matching, the light wave of a new wave band is generated by means of frequency doubling, frequency combination, difference frequency, optical parametric amplification effect and the like, the wavelength range of the laser light source is expanded, and the new laser light source is obtained. The nonlinear optical crystal material of the infrared band is mainly concentrated in V and VI main group ternary compounds; typical crystals in the visible-near infrared band are phosphate (KDP), iodate (KIO3), niobate (LiNbO3), and the like; ultraviolet/deep ultraviolet band crystals are the current research focus in the field, and mainly comprise borate (BBO, LBO and CBO), carbonate, nitrate and the like. Wherein the BBO crystal has the advantages of high laser damage threshold, extremely wide light transmission range, extremely low absorption coefficient, large frequency multiplication coefficient, wide phase matching range and the like, and is widely applied to Nd3+: YAG laser with double frequency, triple frequency, quadruple frequency and quintupling frequency, optical parametric oscillator, optical parametric amplifier, etc. The utility model discloses propose for the first time to use the BBO crystal as doubling of frequency crystal, regard as the direct double frequency of fundamental frequency light by visible light fiber laser and produce this innovation scheme of ultraviolet laser, filled this blank in the direct doubling of frequency production ultraviolet laser field of visible light wave band fiber laser.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the main technical problem that a visible light wave band fiber laser doubling of frequency produces its device of ultraviolet laser is provided, solve traditional frequency multiplication/frequency multiplication full solid-state ultraviolet laser and gas laser and have the structure complicacy, be difficult to realize shortcoming such as miniaturization, maintenance cost are too high and laser beam quality is relatively poor, and do not realize the shortcoming of ultraviolet laser output yet in the fiber laser field.
In order to solve the technical problem, the utility model provides a visible light band fiber laser intracavity doubling of frequency produces ultraviolet laser's device, include: a fundamental frequency fiber laser system, a frequency doubling system and an optical coupling system; the fundamental frequency optical fiber laser system comprises a pumping source, a gain optical fiber, a reflector, a dichroic beam splitter, an optical fiber end face coating mirror or a blazed grating; the optical coupling system comprises an aspheric lens and an optical fiber ceramic ferrule;
the output end of the pump source couples the pump light to one end of the gain fiber through a dichroic beam splitter which has high transmittance to the pump wavelength and reflects the fundamental frequency light at an angle of 45 degrees and a non-spherical lens; the other end of the gain optical fiber is connected to one end of the matched quartz optical fiber through the optical fiber ceramic ferrule; the connection part of the gain optical fiber and the matching optical fiber is provided with an optical fiber end surface film coating mirror or a blazed grating of a visible light wave band; a frequency doubling system and a reflector are sequentially arranged on the spatial light path with the angle of 45 degrees of the dichroic beam splitter; the optical fiber end face coating mirror or the blazed grating and a reflector placed on a 45-degree angle space light path of the dichroic beam splitter form a linear resonant cavity structure;
the frequency doubling system comprises a frequency doubling crystal, a half-wave plate and an ultraviolet aspheric lens group; the frequency doubling system focuses the fundamental frequency light on a frequency doubling crystal through an ultraviolet aspheric lens to generate ultraviolet laser, and then the other ultraviolet aspheric lens collimates the light penetrating through the crystal, wherein the fundamental frequency light is fed back to the gain optical fiber through a reflector, and the ultraviolet laser is output through the reflector.
The utility model also provides a visible light wave band fiber laser intracavity doubling of frequency produces ultraviolet laser's device, include: the system comprises a fundamental frequency fiber laser system, a frequency doubling system and an optical coupling system; the fundamental frequency optical fiber laser system comprises a pumping source, an aspheric lens, a gain optical fiber, a first aspheric lens and a dichroic beam splitter; the optical coupling system comprises a second aspheric lens and an optical fiber ceramic ferrule;
the output end of the pump source couples the pump light to one end of the gain fiber through a dichroic beam splitter which has high transmittance to the pump wavelength and reflects the fundamental frequency light at an angle of 45 degrees and a first aspheric lens; a frequency doubling system and a second aspheric lens are sequentially arranged on the spatial light path with the angle of 45 degrees of the dichroic beam splitter; the other end of the gain optical fiber is connected to the second aspheric lens through the optical fiber ceramic ferrule; the gain optical fiber and the second aspheric lens form a linear resonant cavity structure;
the frequency doubling system comprises a frequency doubling crystal, a half-wave plate and an ultraviolet aspheric lens group; the frequency doubling system focuses fundamental frequency light on a frequency doubling crystal through an ultraviolet aspheric lens to generate ultraviolet laser, and then the other ultraviolet aspheric lens collimates the light penetrating through the crystal, wherein the fundamental frequency light reenters a gain optical fiber through a dichroic beam splitter and a first aspheric lens to form a laser annular cavity structure, and the ultraviolet laser generated through frequency doubling in the annular cavity is output through the dichroic beam splitter.
In a preferred embodiment: the gain fiber is a single-clad or double-clad fluoride fiber doped with rare earth elements.
In a preferred embodiment: the rare earth ions doped in the gain optical fiber are dysprosium, thulium, holmium and praseodymium, and the doping concentration is more than 500 ppm.
In a preferred embodiment: the pumping source is a high-power LD blue light pumping source, a high-power LD red light pumping source or a Raman laser with the wavelength matched with the gain fiber.
In a preferred embodiment: an optical fiber ceramic plug is arranged at the joint of the gain optical fiber and the matching optical fiber; the optical fiber ceramic ferrule head comprises a metal sleeve and a ceramic ferrule, and one ends of the gain optical fiber and the matching optical fiber are inserted into the ceramic ferrule and fixed by the metal sleeve.
In a preferred embodiment: the reflector has high reflectivity in a fundamental frequency light wave band, and the reflectivity is more than 95%; has high transmittance in ultraviolet band, and the transmittance is more than 95 percent.
In a preferred embodiment: the blazed grating is a reflection-type groove diffraction grating with blazed wavelength in a visible light wave band, has different blazed angles to meet various optical requirements, and has the actual grating efficiency of 60-80% under the blazed wavelength.
In a preferred embodiment: the frequency doubling crystal is a BBO crystal, and the cutting angle of the crystal is matched with the wavelength of the required fundamental frequency light.
In a preferred embodiment: the transmission rate of the dichroic beam splitter to pump light is larger than 90%, the dichroic beam splitter reflects fundamental frequency light at an angle of 45 degrees, and the reflectivity is larger than 90%.
In a preferred embodiment: the ultraviolet aspheric lens is plated with an antireflection film in an ultraviolet band.
Drawings
Fig. 1 is a diagram of a cavity device of direct intracavity frequency doubling uv laser of a visible light band fiber laser according to a preferred embodiment 1 of the present invention;
fig. 2 is a diagram of an annular cavity device for direct intracavity frequency doubling uv laser of a visible light band fiber laser according to the preferred embodiment of the present invention 2;
fig. 3 is a spectrogram of direct intracavity frequency doubling uv laser of a visible light band fiber laser in embodiments 1 and 2 of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention; it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise specifically stated or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are used in a broad sense, and for example, "connected" may be a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection through an intermediate medium, and a communication between two elements.
Example 1
As shown in fig. 1 and 3, an apparatus for generating ultraviolet laser by frequency doubling of a visible light band fiber laser adopts a linear laser cavity structure, and includes: a fundamental frequency fiber laser system, a frequency doubling system and an optical coupling system;
the fundamental frequency fiber laser system includes: the device comprises a pumping source 1, a dichroic beam splitter 2, an aspheric lens 3, an optical fiber end face coating mirror 6 or a blazed grating; the optical coupling system comprises an optical fiber ceramic ferrule 4 and a gain optical fiber 5. Wherein the gain fibers 5 are respectively doped with rare earth ions (Dy)3+、Tm3+、Ho3+、Pr3+) A fluoride optical fiber; the pumping source 1 is a high-power LD blue light pumping source, a Raman fiber laser near 1100nm band, a high-power LD red light pumping source, a high-power LD blue light pumping source or a dual-wavelength pump near 1 μm and 835nm wavelength corresponding to the gain fiber respectively.
The output end of the pump source 1 couples pump light into one end of a gain fiber 5 through a dichroic beam splitter 2 with high pump light transmittance and an aspheric lens 3, and the other end of the gain fiber 5 is connected to one end of a matched quartz fiber 7; and a fiber end face coating mirror 6 or a blazed grating in a visible light wave band is arranged at the joint of the gain fiber 5 and the matched quartz fiber 7. The optical fiber end face coating mirror 6 is coated at the end where the matching quartz optical fiber 7 is connected with the gain optical fiber 5 by using a plasma sputtering low-temperature coating technology; the blazed grating can directly replace a matched quartz optical fiber 7 plated with an optical fiber end face coating mirror 6, has the function of forming a resonant cavity with a reflector 9, and can also tune the wavelength of ultraviolet laser output.
The energy is injected into the gain fiber 5 by the pumping source, rare earth ions doped in the gain fiber 5 absorb pumping light and provide fundamental frequency light gain amplification under stimulated radiation, and the fiber end face coating mirror 6 with high reflectivity in a visible light wave band and the reflector 9 with high reflectivity of fundamental frequency light and high transmittance of ultraviolet laser construct a fundamental frequency light resonant cavity, so that high-power continuous light output is realized at a plurality of wavelengths in the visible light wave band.
The frequency doubling system 8 is arranged in a space light path between the dichroic beam splitter 2 and the reflector 9, and the frequency doubling system 8 comprises a frequency doubling crystal, an ultraviolet aspheric lens group and a half-wave plate. Two ends of the frequency doubling crystal are respectively provided with an ultraviolet aspheric lens to focus the fundamental frequency light in the cavity into the frequency doubling crystal, and the fundamental frequency light beam penetrating through the frequency doubling crystal at the other end is collimated; meanwhile, a half-wave plate is arranged in the frequency doubling system 8 and used for adjusting the polarization state of the fundamental frequency light. Ultraviolet laser generated by direct frequency doubling of the fundamental frequency light is output by a reflector 9 with high transmittance in an ultraviolet band.
In this embodiment, the pumping source is a high-power LD blue laser with a wavelength matched with the different gain fibers, and the laser wavelength output by the high-power LD blue laser is near 450 nm; the output wavelength of the high-power LD red laser is about 645 nm; a Raman fiber laser having an output wavelength of around 1153 nm;
an optical fiber ceramic plug 4 is arranged at the joint of the gain optical fiber 5 and the matching optical fiber 7; the optical fiber ceramic core plug 4 comprises a metal sleeve and a ceramic core insert, and one ends of the gain optical fiber 5 and the matching optical fiber 7 are inserted into the ceramic core insert and fixed by the metal sleeve.
The plasma sputtering low-temperature coating technology bombards the surface of the target by adopting ions, so that atoms of the target are knocked out, and the atoms generated by sputtering are deposited on the surface of a substrate to form a film.
Compared with the traditional visible light laser, the fundamental frequency optical fiber laser system realizes the watt-level continuous laser output, obtains higher pumping conversion skew efficiency, not only realizes the output of the watt-level visible light wave band laser for the first time, but also adopts the optical fiber end face coating technology and Dy-doped laser3+The fluoride gain fiber realizes a compact, highly efficient and miniaturized laser of an optical fiber structure.
Compared with the traditional ultraviolet laser, the device for generating the ultraviolet laser by frequency doubling of the visible light waveband optical fiber laser firstly uses the visible light laser to directly generate the ultraviolet laser by frequency doubling in the cavity, and obtains higher frequency doubling efficiency; the utility model discloses use multiple rare earth ion fluoride optic fibre of doping can accomplish to change different pump sources and resonant cavity parameter and obtain the visible light fundamental frequency laser output of different wave bands, produce the ultraviolet laser of multiple wavelength through the direct frequency doubling of BBO crystal. The method and the device for frequency doubling to generate ultraviolet laser of the visible light wave band optical fiber laser have the advantages of compact, high-efficiency and miniaturization, tunable ultraviolet frequency doubling laser wave band, no need of maintenance cost, stable operation and the like.
Example 2
As shown in fig. 2, an apparatus for generating ultraviolet laser by frequency doubling of a visible light band fiber laser adopts a ring laser cavity structure, and includes: the device comprises a pumping source 1, a dichroic beam splitter 2, a first aspheric lens 3, an optical fiber ceramic ferrule 4, a gain optical fiber 5, a frequency doubling system 8 and a second aspheric lens 9.
Wherein the gain fibers 5 are respectively doped with rare earth ions (Dy)3+、Tm3+、Ho3+、Pr3+) A fluoride optical fiber; the pumping source 1 is a high-power LD blue light pumping source, a Raman fiber laser near 1100nm band, a high-power LD red light pumping source, a high-power LD blue light pumping source or a dual-wavelength pump near 1 μm and 835nm wavelength corresponding to the gain fiber respectively.
The output end of the pump source 1 couples pump light into one end of a gain fiber 5 through a dichroic beam splitter 2 with high pump light transmittance and a first aspheric lens 3, the output light at the other end of the gain fiber 5 is directly collimated through a second aspheric lens 9, the frequency doubling system 8 is placed in a spatial light path of the gain fiber 5 collimated through the second aspheric lens 9, fundamental frequency light penetrating through a frequency doubling crystal reenters the gain fiber 5 through the dichroic beam splitter 2 and the first aspheric lens 3 to form a laser annular cavity structure, and ultraviolet laser generated by frequency doubling in the annular cavity is output through the dichroic beam splitter 2 with high ultraviolet light transmittance.
As shown in fig. 2, compared with example 1, this embodiment can reduce the insertion loss caused by the reflector and the fiber end-face coating mirror by constructing the laser ring cavity structure, and obtain higher fundamental frequency skew efficiency, and output higher ultraviolet laser power.
The above description is only a preferred embodiment of the present invention, but the design concept of the present invention is not limited thereto, and any person skilled in the art can make insubstantial changes in the technical scope of the present invention within the technical scope of the present invention, and the actions infringe the protection scope of the present invention are included in the present invention.
Claims (10)
1. The device for producing ultraviolet laser by frequency doubling in the cavity of a visible light wave band fiber laser is characterized by comprising: a fundamental frequency fiber laser system, a frequency doubling system and an optical coupling system; the fundamental frequency optical fiber laser system comprises a pumping source, a gain optical fiber, a reflector, a dichroic beam splitter, an optical fiber end face coating mirror or a blazed grating; the optical coupling system comprises an aspheric lens and an optical fiber ceramic ferrule;
the output end of the pump source couples the pump light to one end of the gain fiber through a dichroic beam splitter which has high transmittance to the pump wavelength and reflects the fundamental frequency light at an angle of 45 degrees and a non-spherical lens; the other end of the gain optical fiber is connected to one end of the matched quartz optical fiber through the optical fiber ceramic ferrule; the connection part of the gain optical fiber and the matching optical fiber is provided with an optical fiber end surface film coating mirror or a blazed grating of a visible light wave band; a frequency doubling system and a reflector are sequentially arranged on the spatial light path with the angle of 45 degrees of the dichroic beam splitter; the optical fiber end face coating mirror or the blazed grating and a reflector placed on a 45-degree angle space light path of the dichroic beam splitter form a linear resonant cavity structure;
the frequency doubling system comprises a frequency doubling crystal, a half-wave plate and an ultraviolet aspheric lens group; the frequency doubling system focuses the fundamental frequency light on a frequency doubling crystal through an ultraviolet aspheric lens to generate ultraviolet laser, and then the other ultraviolet aspheric lens collimates the light penetrating through the crystal, wherein the fundamental frequency light is fed back to the gain optical fiber through a reflector, and the ultraviolet laser is output through the reflector.
2. The device for producing ultraviolet laser by frequency doubling in the cavity of a visible light wave band fiber laser is characterized by comprising: the system comprises a fundamental frequency fiber laser system, a frequency doubling system and an optical coupling system; the fundamental frequency optical fiber laser system comprises a pumping source, an aspheric lens, a gain optical fiber, a first aspheric lens and a dichroic beam splitter; the optical coupling system comprises a second aspheric lens and an optical fiber ceramic ferrule;
the output end of the pump source couples the pump light to one end of the gain fiber through a dichroic beam splitter which has high transmittance to the pump wavelength and reflects the fundamental frequency light at an angle of 45 degrees and a first aspheric lens; a frequency doubling system and a second aspheric lens are sequentially arranged on the spatial light path with the angle of 45 degrees of the dichroic beam splitter; the other end of the gain optical fiber is connected to the second aspheric lens through the optical fiber ceramic ferrule; the gain optical fiber and the second aspheric lens form a linear resonant cavity structure;
the frequency doubling system comprises a frequency doubling crystal, a half-wave plate and an ultraviolet aspheric lens group; the frequency doubling system focuses fundamental frequency light on a frequency doubling crystal through an ultraviolet aspheric lens to generate ultraviolet laser, and then the other ultraviolet aspheric lens collimates the light penetrating through the crystal, wherein the fundamental frequency light reenters a gain optical fiber through a dichroic beam splitter and a first aspheric lens to form a laser annular cavity structure, and the ultraviolet laser generated through frequency doubling in the annular cavity is output through the dichroic beam splitter.
3. The device for generating ultraviolet laser by intracavity frequency doubling of a visible light band fiber laser according to claim 1 or 2, wherein: the gain fiber is a single-clad or double-clad fluoride fiber doped with rare earth elements.
4. The device for generating ultraviolet laser by intracavity frequency doubling of a visible light band fiber laser according to claim 1 or 2, wherein: the pumping source is a high-power LD blue light pumping source, a high-power LD red light pumping source or a Raman laser with the wavelength matched with the gain fiber.
5. The device for generating ultraviolet laser by intracavity frequency doubling of a visible light band fiber laser according to claim 1, wherein: an optical fiber ceramic plug is arranged at the joint of the gain optical fiber and the matching optical fiber; the optical fiber ceramic ferrule head comprises a metal sleeve and a ceramic ferrule, and one ends of the gain optical fiber and the matching optical fiber are inserted into the ceramic ferrule and fixed by the metal sleeve.
6. The device for generating ultraviolet laser by intracavity frequency doubling of a visible light band fiber laser according to claim 1, wherein: the reflector has high reflectivity in a fundamental frequency light wave band, and the reflectivity is more than 95%; has high transmittance in ultraviolet band, and the transmittance is more than 95 percent.
7. The device for generating ultraviolet laser by intracavity frequency doubling of a visible light band fiber laser according to claim 1, wherein: the blazed grating is a reflection-type groove diffraction grating with blazed wavelength in a visible light wave band, has different blazed angles to meet various optical requirements, and has the actual grating efficiency of 60-80% under the blazed wavelength.
8. The device for generating ultraviolet laser by intracavity frequency doubling of a visible light band fiber laser according to claim 1 or 2, wherein: the frequency doubling crystal is a BBO crystal, and the cutting angle of the crystal is matched with the wavelength of the required fundamental frequency light.
9. The device for generating ultraviolet laser by intracavity frequency doubling of a visible light band fiber laser according to claim 1 or 2, wherein: the transmission rate of the dichroic beam splitter to pump light is larger than 90%, the dichroic beam splitter reflects fundamental frequency light at an angle of 45 degrees, and the reflectivity is larger than 90%.
10. The device for generating ultraviolet laser by intracavity frequency doubling of a visible light band fiber laser according to claim 1, wherein: the ultraviolet aspheric lens is plated with an antireflection film in an ultraviolet band.
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