CN114204396A - All-solid-state blue-green laser based on thulium-doped ion crystal - Google Patents

All-solid-state blue-green laser based on thulium-doped ion crystal Download PDF

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CN114204396A
CN114204396A CN202010979169.1A CN202010979169A CN114204396A CN 114204396 A CN114204396 A CN 114204396A CN 202010979169 A CN202010979169 A CN 202010979169A CN 114204396 A CN114204396 A CN 114204396A
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crystal
mirror
frequency doubling
laser
plano
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杭寅
杨依伦
房倩楠
朱影
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Shanghai Institute of Optics and Fine Mechanics of CAS
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Shanghai Institute of Optics and Fine Mechanics of CAS
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/14—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
    • H01S3/16—Solid materials
    • H01S3/1601—Solid materials characterised by an active (lasing) ion
    • H01S3/1603—Solid materials characterised by an active (lasing) ion rare earth
    • H01S3/1616—Solid materials characterised by an active (lasing) ion rare earth thulium
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/08—Construction or shape of optical resonators or components thereof
    • H01S3/081—Construction or shape of optical resonators or components thereof comprising three or more reflectors
    • H01S3/0813—Configuration of resonator
    • H01S3/0815—Configuration of resonator having 3 reflectors, e.g. V-shaped resonators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
    • H01S3/108—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering
    • H01S3/109—Frequency multiplication, e.g. harmonic generation

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  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
  • Lasers (AREA)

Abstract

An all-solid-state blue-green light laser based on thulium-doped ion crystals comprises an excitation source, a gain medium, a nonlinear frequency doubling crystal, an endoscope system and a tuning element. A plane mirror, a gain medium, a tuning element and a planoconcave mirror are sequentially arranged along the laser output direction of the excitation source; a nonlinear frequency doubling crystal and a plano-concave rear cavity mirror are sequentially arranged in the direction of the reflection light path of the plano-concave cavity mirror at a certain angle with the previous light path; the plane mirror, the plano-concave mirror and the plano-concave rear mirror jointly form a folding resonant cavity. Pump light emitted by the excitation source is injected into the gain medium through collimation and focusing, and output 1.85-2.1 mu m mid-infrared laser is converted through the nonlinear frequency doubling crystal to output 462.5-525 nm blue-green laser. The laser has the advantages of rich emission wavelength, tunable laser wavelength, high output power, high stability, simple structure, small size and the like.

Description

All-solid-state blue-green laser based on thulium-doped ion crystal
Technical Field
The invention relates to a laser, in particular to an all-solid-state blue-green laser based on a thulium-doped ion crystal.
Background
The 462-525 nm wave band blue-green laser is positioned in a low-loss window of seawater, and has important application in the aspects of underwater detection, transmission, sensing, communication and the like. Particularly, blue light at the wavelength of 486.1nm forms a Fraunhofer dark line in a solar radiation spectrum due to the absorption of hydrogen atoms, and the laser transmission or communication by utilizing the wavelength can effectively avoid environmental noise and improve the signal-to-noise ratio. The blue laser can significantly improve the information capacity in optical storage by virtue of the advantages of short wavelength, small light spot and the like, and becomes a hot spot direction in high-density optical storage research. In addition, the blue-green laser also corresponds to the absorption waveband of the oxygenated hemoglobin, and has important application prospect in the aspect of laser intravascular irradiation therapeutic instruments. The prior art mainly uses semiconductor technology and nonlinear optical effect to obtain blue-green Laser, such as sum frequency acquisition (Laser Physics,21,2011) between neodymium ion wavelengths, thulium-doped crystal up-conversion (CN109873292A) and thulium-doped fiber quadruple frequency (CN 103311782A). However, the blue-green laser obtained by the prior art often has the defects of low efficiency, complex system and the like, and is difficult to meet the requirements of the modern information society on high-efficiency and high-integration blue-green laser. Therefore, a method for obtaining a high-efficiency, high-power, high-integration blue-green laser is needed to meet the requirements of high-efficiency underwater information transmission, topographic probe light storage, medical treatment, and the like.
Thulium ion energy level3F4-3H6The transition can emit laser light with the wavelength of 2 mu m, and then the output of blue-green laser light can be obtained by combining the nonlinear optical crystals PPLN, LBO, KTP and the like. At present, the thulium-doped crystal obtains hundreds of watt-level output power (Appl Phys B (2009)94: 195-198, Laser Phys.29(2019)115004(4pp)) in a 2 mu m wave band, and blue-green Laser with higher conversion efficiency and higher output power can be obtained by utilizing a frequency doubling technology. Compared with thulium-doped optical fibers, thulium-doped crystals are rich in variety, and the intermediate infrared emission wavelength is various, so that the blue-green laser emission of multiple wavelengths after frequency doubling is realized. Compared with optical fiber, the thulium-doped crystal has wider emission spectrum, and is beneficial to realizing the tunability of laser output wavelength and generating ultrafast laser. In addition, the crystal has excellent thermal performanceAnd with the damage threshold, the laser has a weak nonlinear effect under high-power pumping, and has remarkable advantages in the aspects of generating high-energy, short-pulse and high-peak-power lasers.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an all-solid-state blue-green laser based on a thulium ion doped crystal, which utilizes the thulium ion doped crystal to obtain intermediate infrared fundamental frequency light near 1.85-2.1 mu m, and then utilizes a nonlinear frequency doubling technology to obtain the blue-green laser output of about 462.5-525 nm, and has the advantages of tunable wavelength, simple structure, high output power, high conversion efficiency, high stability and the like.
The technical solution of the invention is as follows:
the utility model provides an all solid-state bluish-green laser based on thulium ion crystal of mixing, can output 462.5 ~ 525nm bluish-green laser, its characteristics lie in: the device comprises an excitation source, a gain medium, a nonlinear frequency doubling crystal, an endoscope system and a tuning element, wherein the endoscope system comprises a plane mirror, a plane concave cavity mirror and a plane concave rear cavity mirror;
the plane mirror, the gain medium, the tuning element and the planoconcave mirror are arranged along the laser output direction of the excitation source in sequence; the nonlinear frequency doubling crystal and the plano-concave rear cavity mirror are sequentially arranged in the direction of the reflection light path of the plano-concave cavity mirror at a certain angle with the previous light path; the plane mirror, the plano-concave mirror and the plano-concave rear mirror jointly form a folding resonant cavity;
the plane mirror, the plane concave cavity mirror and the plane concave rear cavity mirror are respectively used for carrying out film coating optimization on the working wavelength, and the plane mirror is coated with a dielectric film with high reflection of 1.85-2.1 mu m and high transmission of 793 nm; the planoconcave mirror is plated with a dielectric film with high reflection of 1.85-2.1 mu m, high reflection of 0.925-1.05 mu m, high reflection of 793nm and high transmission of 462.5-525 nm; the plano-concave rear cavity mirror is plated with a dielectric film with high reflection of 1.85-2.1 mu m, high reflection of 0.925-1.05 mu m and high reflection of 462.5-525 nm.
The excitation source is a laser diode laser with the output wavelength near 793 nm;
the gain medium is a thulium-doped ion crystal;
the nonlinear frequency doubling crystal can select a mode of combining a first-stage frequency doubling crystal and a second-stage frequency doubling crystal or a mode of directly outputting a single nonlinear crystal;
when the nonlinear frequency doubling crystal adopts a mode of combining a first-stage frequency doubling crystal and a second-stage frequency doubling crystal, the first-stage frequency doubling crystal is selected from KTP, PPLN or LBO crystals, and the second-stage frequency doubling crystal is selected from KTP, LBO or BBO crystals;
when the nonlinear frequency doubling crystal selects a mode of directly outputting a single nonlinear crystal, the nonlinear frequency doubling crystal is a periodically polarized lithium niobate crystal with a multi-period optical superlattice structure, and multiple polarization periods are provided in the same crystal, so that the quadruple frequency of laser can be realized in the same crystal.
The invention relates to an all-solid-state blue-green laser based on a thulium-doped ion crystal, which comprises an excitation source, a gain medium, a nonlinear frequency doubling crystal, an endoscope system and a tuning element, wherein the all-solid-state blue-green laser firstly generates intermediate infrared laser output with the wavelength of 1.85-2.1 mu m, and then is converted into blue-green laser output with the wavelength of 462.5-525 nm through a nonlinear frequency doubling technology.
The gain medium is a thulium-doped ionic crystal selected from thulium-doped yttrium lithium fluoride, lutetium lithium fluoride, gadolinium lithium fluoride, lanthanum fluoride, lead fluoride and LiCaAlF6、LiSrAlF6Yttrium aluminum garnet, yttrium aluminate, yttrium calcium aluminate, yttrium oxide, lutetium oxide, scandium oxide, and the like.
The thulium-doped ionic crystal is processed into a rod with the light passing direction being 1-30 mm long according to specific use requirements during working, and the light passing surface is cylindrical, rectangular or in other forms.
And a tuning element is added in the fundamental frequency laser cavity, so that blue-green laser with tunable output wavelength is realized. Preferably, the tuning element may be selected from the following: prisms, gratings, birefringent filters or fabry-perot etalons.
The 1.85-2.1 μm laser output by the gain medium is converted into blue-green laser with the wavelength of 462.5-525 nm through the nonlinear frequency doubling crystal, and according to the selection of the nonlinear frequency doubling crystal, the following two preferable implementation methods are provided:
according to the first method, two nonlinear frequency doubling crystals are respectively selected, 1.85-2.1 mu m fundamental frequency laser is firstly converted into 0.925-1.05 mu m first frequency doubling light through the first frequency doubling crystal, and then the first frequency doubling light is converted into 462.5-525 nm blue-green light laser through the second frequency doubling crystal.
In the first method, the first frequency doubling crystal is selected from KTP, PPLN or LBO crystal, and the second frequency doubling crystal is selected from KTP, LBO or BBO crystal.
In method one, the endoscope system comprises M1Mirror, M2Mirror and M3And the working wavelength of the mirror is optimized by coating. M1Mirror-plating with a dielectric film having a high reflection of 1.85-2.1 μ M and a high transmission of 793nm, M2Mirror-plating with a dielectric film having a high reflection of 1.85-2.1 μ M, a high reflection of 0.925-1.05 μ M, a high reflection of 793nm and a high transmission of 462.5-525 nm, M3The mirror is coated with a dielectric film with high reflection of 1.85-2.1 μm, high reflection of 0.925-1.05 μm and high reflection of 462.5-525 nm.
In the first method, the laser working process is as follows:
[1]pump light emitted by excitation source passes through M1The mirror is incident to the gain medium to generate 1.85-2.1 μm fundamental laser;
[2]1.85-2.1 μ M fundamental frequency laser passes through M2Mirror reflection is carried out to the first-order frequency doubling crystal to generate first-order frequency doubling light of 0.925 to 1.05 mu m;
[3] the primary frequency doubling light with the wavelength of 0.925 to 1.05 mu m is incident into the secondary frequency doubling crystal, so that 462.5 to 525nm blue-green laser is generated;
[4]462.5-525 nm blue-green laser passing through M2Reflection of the mirror via M2And (4) mirror output.
According to the second method, a single nonlinear frequency doubling crystal is selected, and 1.85-2.1 mu m fundamental frequency laser output by the gain medium can be directly converted into blue-green laser with the wavelength of 462.5-525 nm.
In the second method, the nonlinear frequency doubling crystal is a periodically polarized lithium niobate crystal with a multi-period optical superlattice structure, and multiple polarization periods are provided in the same crystal, so that the quadruple frequency of the laser can be realized in the same crystal.
In method two, the endoscopic system comprises M1Mirror, M2Mirror and M3And the coating optimization of the mirror is the same as that in the first method.
In the second method, the laser working process is as follows:
[1]pump light emitted by excitation source passes through M1The mirror is incident to the gain medium to generate 1.85-2.1 μm fundamental laser;
[2]1.85-2.1 μ M laser passing M2Mirror-reflecting into a nonlinear frequency doubling crystal to generate 462.5-525 nm blue-green laser;
[3]462.5-525 nm blue-green light in M2And M3After oscillating in the cavity of the composition, the final laser passes through M2And (4) mirror output.
Foretell all solid-state bluish green light laser based on thulium ion crystal mixes, refrigerating system for water circulation refrigeration, forced air cooling or semiconductor refrigeration, can effectively dissipate the heat that the laser instrument produced in working, guarantee normal work.
Foretell blue-green light laser instrument of all solid-state based on thulium ion crystal of mixing, control system be current control and stable system, can ensure that the output of pump laser instrument is stable, and then improve the stability of blue-green light laser instrument work.
Compared with the existing blue-green laser, the invention has the beneficial effects that:
1. the thulium-doped crystal has rich varieties and various mid-infrared emission wavelengths, and is favorable for realizing blue-green laser emission with various wavelengths after frequency doubling;
2. the thulium-doped crystal has a wider emission spectrum, and can realize that the output wavelength of laser can be adjusted within a certain range by matching with a tuning element;
3. the thulium-doped crystal has excellent thermal performance and damage threshold, and has remarkable advantages in generating laser with large energy, short pulse, high peak power and high repetition frequency;
4. the crystal can realize thulium ion doping with high concentration, can effectively reduce the size of the used laser gain medium, and is beneficial to the miniaturization application of a laser.
Drawings
FIG. 1 is a structural diagram of an all-solid-state blue-green laser embodiment 1 based on thulium-doped ion crystal according to the present invention
FIG. 2 is a structural diagram of an all-solid-state blue-green laser embodiment 2 based on a thulium-doped ion crystal according to the present invention
Fig. 3 is a structural diagram of an all-solid-state blue-green laser embodiment 3 based on a thulium-doped ion crystal according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clear, the present invention is specifically described below with reference to the accompanying drawings and embodiments. The examples herein are provided only for the purpose of explaining the present invention and are not intended to limit the present invention.
Example 1
The thulium-doped scandium oxide crystal is used as a gain medium, and the frequency of the two nonlinear frequency doubling crystals is doubled to obtain a tunable blue-green laser with the wavelength of 500-525 nm.
The structure is shown in figure 1, and the device is composed of an excitation source 1, a gain medium 2, a nonlinear frequency doubling crystal 3, an endoscope system, a tuning element M4, a refrigeration system and a control system according to an optical path sequence.
The excitation source 1 is a laser diode emitting at a wavelength of 793 nm. The gain medium 2 is Tm: Sc with a doping concentration of 5 at%2O3The crystal is cut into square laser bars of 3x3x5 mm along the light passing direction c, and the end faces are polished. The nonlinear frequency doubling crystal 3 is divided into a first-stage frequency doubling crystal 31KTP and a second-stage frequency doubling crystal 32 LBO.
The laser cavity body adopts a folding cavity design and uses three cavity mirrors with coating films. Plane mirror M1Plating a dielectric film with high reflection of 2.0-2.1 μ M and high transmission of 793nm, and a planoconcave mirror M2Plating a dielectric film with high reflection of 2.0-2.1 μ M, high reflection of 1.0-1.05 μ M, high reflection of 793nm and high transmission of 500-525 nm, and planoconcave rear cavity mirror M3Plating a dielectric film with high reflection of 2.0-2.1 μm, high reflection of 1.0-1.05 μm and high reflection of 500-525 nm.
Tuning element M4Adopts a quartz birefringent filter plate and is inserted into a plano-concave mirror at Brewster's angleM2Before the mirror, the tuning of fundamental frequency optical wavelength can be realized by rotating the angle of the quartz plate, and then the tuning of the final output blue-green laser wavelength is realized.
The excitation source, the gain medium, the nonlinear frequency doubling crystal, the cavity mirror and the tuning element are placed on the same collimation axis after being calibrated. The pumping light emitted by the excitation source passes through the M after being collimated and focused1The mirror is incident to the gain medium to generate 2.0-2.1 μ M fundamental laser passing through the tuning element M4The tuning of the wavelength can be achieved. Fundamental frequency laser through output M2Mirror reflection is carried out to the first-order frequency doubling crystal to generate first-order frequency doubling light with the wavelength of 1.0-1.05 mu m. The primary frequency doubling light is incident into the secondary frequency doubling crystal, so that 500-525 nm blue-green laser is generated. Finally, the blue-green laser of 500-525 nm passes through M3Reflection of the mirror via a plano-concave mirror M2And (6) outputting.
Example 2
The thulium-doped lanthanum fluoride crystal is used as a gain medium, and a 462.5-500 nm tunable blue-green laser with frequency doubling of a periodically polarized lithium niobate crystal with a multi-periodic optical superlattice structure is used.
The structure is shown in figure 2, and the device is composed of an excitation source 1, a gain medium 2, a nonlinear frequency doubling crystal 3, an endoscope system, a tuning element, a refrigeration system and a control system according to a light path sequence.
The excitation source 1 is a laser diode emitting at a wavelength of 793 nm. The gain medium 2 is a Tm: LaF doped with 4 at%3The crystal is cut into square laser bars of 3x3x8 mm along the light passing direction c, and the end faces are polished. The nonlinear frequency doubling crystal is a lithium niobate crystal designed through a special polarization period, has two polarization periods in the same crystal, and can realize the quadruple frequency of 1.85-2.0 mu m laser in the same crystal, thereby outputting blue-green laser.
The laser cavity body adopts a folding cavity design and uses three cavity mirrors with coating films. Plane mirror M1Plating a dielectric film with high reflection of 1.85-2.0 μ M and high transmission of 793nm, and forming a planoconcave mirror M2Plating with a medium having a high reflection of 1.85-2.0 μm, a high reflection of 925-1000 nm, a high reflection of 793nm and a high transmission of 462.5-500 nmMembrane, plano-concave rear mirror M3Plating a dielectric film with high reflection of 1.95-2.0 μm, high reflection of 925-1000 nm and high reflection of 462.5-500 nm.
Tuning element M4Using a quartz birefringent filter inserted at M at Brewster's angle2Before the mirror, the tuning of fundamental frequency optical wavelength can be realized by rotating the angle of the quartz plate, and then the tuning of the final output blue-green laser wavelength is realized.
The excitation source, the gain medium, the nonlinear frequency doubling crystal and the cavity mirror are calibrated and then placed on the same collimation axis. The pumping light emitted by the excitation source passes through the M after being collimated and focused1The mirror is incident to the gain medium to generate 1.85-2.0 μm fundamental laser. Fundamental frequency laser passes through M2After being reflected by a mirror, the laser beam is incident into a nonlinear frequency doubling crystal, and the frequency of the laser beam is changed in a periodically polarized lithium niobate crystal, so that 462.5-500 nm blue-green laser is output. Finally, 462.5-500 nm blue-green laser passes through M3Reflection of the mirror via a plano-concave mirror M2And (6) outputting.
The excitation source, the gain medium and the nonlinear frequency doubling crystal of the blue-green laser generation devices in the embodiments 1 and 2 are all effectively refrigerated through a water circulation system, and heat generated in the working process is dissipated. The excitation source regulates the current and output power through a control system.
Example 3
The thulium-doped yttrium calcium aluminate crystal is used as a gain medium 2, and two nonlinear frequency doubling crystals are utilized to double frequency a 486.1nm blue laser.
The structure is shown in fig. 3, and the device is composed of an excitation source 1, a gain medium 2, a nonlinear frequency doubling crystal 3, an endoscope system, a refrigeration system and a control system according to a light path sequence.
The excitation source 1 is a laser diode emitting at a wavelength of 793 nm. Gain medium 2 is doped with a Tm of 4 at%4The crystal is cut into square laser bars of 3x3x6 mm along the light passing direction a, and the end faces are polished. The nonlinear frequency doubling crystal 3 is divided into a first-stage frequency doubling crystal 31PPLN and a second-stage frequency doubling crystal 32 LBO.
The laser cavity body adopts a folding cavity design and uses three cavity mirrors with coating films. Plane mirror M1Plating 1944.4nm high-reflection 793nm high-transmission dielectric film, plano-concave mirror M2Plating a dielectric film with 1944.4nm high reflection, 972.2nm high reflection, 793nm high reflection and 486.1nm high transmission, and a plano-concave rear cavity mirror M3And plating a dielectric film with 1944.4nm high reflection, 972.2nm high reflection and 486.1nm high reflection.
The excitation source, the gain medium, the nonlinear frequency doubling crystal, the cavity mirror and the tuning element are placed on the same collimation axis after being calibrated. The pumping light emitted by the excitation source passes through the M after being collimated and focused1The mirror is incident on the gain medium and generates 1944.4nm fundamental laser light. Fundamental frequency laser through output M2The mirror reflects into the first order frequency doubling crystal to generate 972.2nm first order frequency doubling light. The primary frequency doubling light is incident into the secondary frequency doubling crystal, so that 486.1nm blue laser is generated. Finally, 486.1nm blue laser passes through the plano-concave rear cavity mirror M3Is reflected by the plano-concave mirror M2And (6) outputting.
Experiments show that the invention has the following advantages:
1. the thulium-doped crystal has rich varieties and various mid-infrared emission wavelengths, and is favorable for realizing blue-green laser emission with various wavelengths after frequency doubling;
2. the thulium-doped crystal has a wider emission spectrum, and can realize that the output wavelength of laser can be adjusted within a certain range by matching with a tuning element;
3. the thulium-doped crystal has excellent thermal performance and damage threshold, and has remarkable advantages in generating laser with large energy, short pulse, high peak power and high repetition frequency;
4. the crystal can realize thulium ion doping with high concentration, can effectively reduce the size of the used laser gain medium, and is beneficial to the miniaturization application of a laser.
The laser has the advantages of rich emission wavelength, tunable laser wavelength, high output power, high stability, simple structure, small size and the like.

Claims (6)

1. The utility model provides an all solid-state bluish-green laser based on thulium ion crystal of mixing, can output 462.5 ~ 525nm bluish-green laser, its characterized in that: comprises an excitation source (1), a gain medium (2) and a non-excitation sourceLinear frequency doubling crystal (3), cavity mirror system and tuning element (M)4) The cavity mirror system comprises a plane mirror (M)1) Plano-concave mirror (M)2) Plano-concave rear mirror (M)3)；
The plane mirrors (M) are arranged along the laser output direction of the excitation source (1) in sequence1) Gain medium (2), tuning element (M)4) Plano-concave mirror (M)2) (ii) a At an angle to the previous light path in said plano-concave mirror (M)2) The non-linear frequency doubling crystal (3) and a plano-concave rear cavity mirror (M) are arranged in sequence in the direction of the reflection light path3) (ii) a The plane mirror (M)1) Plano-concave mirror (M)2) Plano-concave rear mirror (M)3) The folded resonant cavity is formed;
the plane mirror (M)1) Plano-concave mirror (M)2) Plano-concave rear mirror (M)3) Respectively coated at their operating wavelengths, said flat mirrors (M)1) Plating a dielectric film with high reflection of 1.85-2.1 mu m and high transmission of 793 nm; the plano-concave mirror (M)2) Plating a dielectric film with high reflection of 1.85-2.1 μm, high reflection of 0.925-1.05 μm, high reflection of 793nm and high transmission of 462.5-525 nm; the plano-concave rear cavity mirror (M)3) Plating a dielectric film with high reflection of 1.85-2.1 μm, high reflection of 0.925-1.05 μm and high reflection of 462.5-525 nm.
2. The thulium-doped ion crystal based all-solid-state blue-green laser according to claim 1, wherein the excitation source (1) is a laser diode laser with an output wavelength around 793 nm;
3. the thulium-doped ionic crystal-based all-solid-state blue-green laser according to claim 1, wherein the gain medium (2) is a thulium-doped ionic crystal;
4. the thulium-doped ion crystal-based all-solid-state blue-green laser according to claim 1, wherein the nonlinear frequency doubling crystal (3) can be selected from a combination of a first-order frequency doubling crystal and a second-order frequency doubling crystal, or a direct output mode of a single nonlinear crystal;
5. the thulium-doped crystal based all-solid-state blue-green laser according to claim 4, wherein when the nonlinear frequency doubling crystal (3) is selected to adopt a combination of a first frequency doubling crystal and a second frequency doubling crystal, the first frequency doubling crystal is selected from KTP, PPLN or LBO crystal, and the second frequency doubling crystal is selected from KTP, LBO or BBO crystal;
6. the all-solid-state blue-green laser based on thulium-doped ion crystal as claimed in claim 4, wherein when the nonlinear frequency doubling crystal (3) selects the mode of direct output of single nonlinear crystal, the nonlinear frequency doubling crystal is a periodically polarized lithium niobate crystal with a multi-period optical superlattice structure, and has multiple polarization periods in the same crystal, thereby achieving the quadruple frequency of laser in the same crystal.
CN202010979169.1A 2020-09-17 2020-09-17 All-solid-state blue-green laser based on thulium-doped ion crystal Pending CN114204396A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115313133A (en) * 2022-08-10 2022-11-08 山东大学 Method for breaking through limitation of fluorescence spectrum on laser wavelength and laser

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115313133A (en) * 2022-08-10 2022-11-08 山东大学 Method for breaking through limitation of fluorescence spectrum on laser wavelength and laser
WO2024031743A1 (en) * 2022-08-10 2024-02-15 山东大学 Method for breaking through limitation of fluorescence spectrum on laser wavelength, and laser device

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