A dysprosium ion-activated yellow and ultraviolet dual-wavelength laser

Abstract

The application discloses a dysprosium ion activated yellow light and ultraviolet dual-wavelength laser, and relates to laser technology. The laser comprises a pump source, an optical focusing system, a laser resonant cavity and a laser switching output device which are sequentially connected. The laser resonant cavity is provided with an input mirror and an output mirror at two ends of a light transmission direction. One side of the mirror cavity of the input mirror and the output mirror is coated with a corresponding dielectric film. The laser resonant cavity is internally provided with a non-centrosymmetric borate crystal doped with Dy 3+ The laser switching output device is used for controlling and switching the output of generated yellow light and ultraviolet light. The non-centrosymmetric borate crystal doped with Dy 3+ The laser switching output device is used for controlling and switching the output of generated yellow light and ultraviolet light. The non-centrosymmetric borate crystal doped with Dy

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of laser equipment, more particularly to a dysprosium ion activated yellow and ultraviolet dual-wavelength laser. BACKGROUND

[0002] At present, the Dy 3+ Doped laser crystal is a common means to obtain yellow laser. In the early research, the laser crystals used mainly include fluoride and oxide crystals with low phonon energy and high phonon energy, such as LiYF4, LiLuF4, Y3Al5O 12 , ZnWO4, GdMgB5O 10 , LaMgB5O 10 , etc. The highest yellow laser power reaches 628mW. However, all the Dy 3+ doped laser crystals reported so far that can realize yellow laser belong to centrosymmetric crystals without nonlinear frequency doubling effect, and thus cannot simultaneously generate laser of other wavebands, such as ultraviolet light. That is to say, the existing Dy 3+ doped yellow laser crystals and lasers do not have the ability to simultaneously operate yellow laser and ultraviolet laser.

[0003] Therefore, how to realize the output of yellow and ultraviolet dual-wavelength laser by using Dy 3+ doped laser crystal is a technical problem that needs to be solved by those skilled in the art. SUMMARY

[0004] Therefore, the present application provides a dysprosium ion activated yellow and ultraviolet dual-wavelength laser.

[0005] In order to achieve the above purpose, the present application adopts the following technical solutions:

[0006] A dysprosium ion activated yellow and ultraviolet dual-wavelength laser comprises, in sequence, a pump source, an optical focusing system, a laser resonant cavity and a laser switching output device.

[0007] The two ends of the light transmission direction of the laser resonant cavity are respectively provided with an input mirror and an output mirror. One side of the mirror cavity of the input mirror is coated with a dielectric film with high transmission at 350nm-500nm and high reflection at 550-600nm and 275-300nm. One side of the mirror cavity of the output mirror is coated with a dielectric film with high reflection at 350nm-500nm, partial transmission at 550nm-600nm and high transmission at 275nm-300nm.

[0008] The laser resonant cavity is internally provided with a Dy 3+A non-centrosymmetric borate crystal of ions; the laser switching output device is used to control and switch the output of yellow light and ultraviolet light.

[0009] Preferably, the non-centrosymmetric borate crystal of the present invention includes lanthanum calcium borate crystal La₂CaB₂. 10 O 19 Yttrium calcium oxyborate crystals YCa4O(BO3)3, yttrium aluminum borate crystals YAl3(BO3)4, or sodium lanthanum borate crystals Na3La9O3(BO3)8;

[0010] Among them, lanthanum calcium borate crystal La2CaB 10 O 19 The space group of yttrium oxy calcium borate crystal YCa4O(BO3)3 is Cm; the space group of yttrium aluminum borate crystal YAl3(BO3)4 is R32; and the space group of sodium lanthanum borate crystal Na3La9O3(BO3)8 is P-62m.

[0011] Preferably, Dy-doped 3+ In non-centrosymmetric borate crystals of ions, Dy 3+ The doping concentration of ions is 0.1%-50%, more preferably 1%-30%, specifically 1%, 2%, 3%, 5%, 10%, and 15%.

[0012] Preferably, the light-transmitting surface of the non-centrosymmetric borate crystal includes a circle, a square, or a rectangle.

[0013] Preferably, the non-centrosymmetric borate crystal has a crystal length of 5mm-30mm in the light transmission direction.

[0014] Preferably, the pump source is used to emit laser wavelengths of 350nm-500nm, including a blue diode laser or an all-solid-state frequency-doubled blue laser.

[0015] Preferably, the laser switching output device includes a rotating shaft, and the output end of the rotating shaft is provided with a yellow light filter for outputting yellow light and an ultraviolet light filter for outputting ultraviolet light. When the rotating shaft rotates, the yellow light filter or the ultraviolet light filter can be rotated to the output optical path of the laser resonant cavity.

[0016] Preferably, there are multiple yellow light filters and ultraviolet light filters, and each yellow light filter and each ultraviolet light filter are evenly spaced at the output end of the rotating shaft.

[0017] As can be seen from the above technical solution, compared with the prior art, the present invention discloses a dysprosium ion activated dual-wavelength laser of yellow light and ultraviolet light, which has the following beneficial effects:

[0018] The present application utilizes Dy 3+ The non-central symmetric borate crystal and resonant laser cavity of the ion realize the generation of yellow light and ultraviolet light, and realize the switching output of yellow light and ultraviolet light by means of a laser switching output device.

[0019] The present application utilizes the high phonon energy of the borate laser crystal, can enhance the electron-lattice coupling effect of the crystal, thereby reducing the Dy 3+ The non-central symmetric borate crystal and resonant laser cavity of the ion realize the generation of yellow light and ultraviolet light, and realize the switching output of yellow light and ultraviolet light by means of a laser switching output device. 6 H 13 / 2 The lower energy level lifetime, improve yellow light laser efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only a part of the embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the provided drawings.

[0021] Figure 1 The structure diagram of the dysprosium ion activated yellow light and ultraviolet dual-wavelength laser provided by the present application is shown in the figure.

[0022] Figure 2 The dysprosium ion activated yellow light and ultraviolet dual-wavelength laser provided by the present application realizes the yellow light laser wavelength output spectrum.

[0023] Figure 3 The dysprosium ion activated yellow light and ultraviolet dual-wavelength laser provided by the present application realizes the phase matching angle calculation of ultraviolet laser.

[0024] Figure 4 The structure diagram of the laser switching output device provided by the present application is shown in the figure.

[0025] Figure 5 The structure diagram of the multiple filters in the laser switching output device provided by the present application is shown in the figure. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0027] As Figure 1As shown, the embodiment of the present application discloses a dysprosium ion activated yellow light and ultraviolet dual-wavelength laser, comprising: a pump source 1, an optical focusing system 2, a resonant cavity input mirror 3, a laser crystal 4, a resonant cavity output mirror 5, and a laser switching output device 6; the laser crystal is located in the laser resonant cavity; the laser resonant cavity is composed of the input mirror 3 and the output mirror 5, and a corresponding waveband dielectric film is coated on one side of the mirror cavity;

[0028] The pump light emitted by the pump source 1 is collimated by the optical focusing system 2, enters the laser resonant cavity through the input mirror 3, and is incident on the laser crystal 4, the laser crystal 4 absorbs the pump energy to occur energy level transition, and outputs a laser beam composed of continuous wave yellow light laser and ultraviolet laser at one end of the output mirror 5. The laser beam passes through the laser switching output device 6, and the switching output of the yellow light laser and the ultraviolet laser is realized, so that the laser can output yellow light laser or ultraviolet laser.

[0029] One side of the mirror cavity of the input mirror 3 is coated with a dielectric film A, or the incident end face of the laser medium crystal is coated with a dielectric film A, and the dielectric film A has high transmission to 350nm-500nm and high reflection to 550-600nm and 275-300nm.

[0030] One side of the cavity mirror of the output mirror 5 is coated with a dielectric film B, the dielectric film B has high reflection to 350nm-500nm waveband, partial transmission to 550nm-600nm waveband, and high transmission to 275nm-300nm.

[0031] In another embodiment, the exit end face of the laser medium crystal can also be coated with a dielectric film B.

[0032] The laser switching output device comprises a rotating shaft, the output end of the rotating shaft is provided with a yellow light filter for outputting yellow light and an ultraviolet light filter for outputting ultraviolet light, when the rotating shaft rotates, the yellow light filter or the ultraviolet light filter can be rotated to the output light path of the laser resonant cavity, the yellow light filter is coated with a dielectric film C, the dielectric film C has high transmission to 557nm-586nm yellow light waveband and high reflection to other wavebands; the ultraviolet light filter is coated with a dielectric film D, which has high transmission to 278nm-293nm ultraviolet waveband and high reflection to other wavebands. The laser switching output device can switch to output yellow light laser or ultraviolet laser.

[0033] The laser crystal 3 is a non-centrosymmetric laser crystal, including but not limited to dysprosium ion doped calcium lanthanum borate crystal, yttrium calcium oxygen borate crystal, yttrium aluminum borate crystal or sodium lanthanum borate crystal, Dy 3+ The doping concentration is 0.1%-2%. The light transmission surface of the laser crystal 3 is circular, square or rectangular, the light transmission surface is polished and coated with a dielectric film under certain conditions or without coating, the length of the light transmission direction is 1mm-50mm, and the preferred crystal length is 5mm-30mm.

[0034] The application will be further described in different embodiments.

[0035] Example 1

[0036] The dysprosium ion doped borate laser crystal and the all-solid-state yellow laser of the application are arranged in sequence by a pump source 1, an optical focusing system 2, a resonant cavity input mirror 3, a borate laser crystal 4, a resonant cavity output mirror 5 and a filter 6. The pump source 1 is a blue diode laser with an emission wavelength of 450 nm. The optical focusing system 2 is a focusing mirror with a focal length of 10 cm. The pump light emitted by the pump source 1 is collimated by the optical focusing system 2 and then enters the laser resonant cavity through the input mirror 3 and is incident on the laser crystal 4. The input mirror 3 is a flat mirror coated with a dielectric film with high transmission for 350 nm-500 nm and high reflection for 550-600 nm and 275-300 nm. The laser crystal 4 is a dysprosium ion doped calcium lanthanum borate La2CaB 10 O 19 crystal with a doping concentration of 5%, a crystal length of 15 mm and a light transmission surface of 3×3 mm 2 , both sides of which are polished. The output mirror 5 is a concave mirror with a curvature of 100 mm and is coated with a dielectric film with high reflection for 350 nm-500 nm, a transmission rate of 0.1% for 550 nm-600 nm and a transmission rate of 99% for 275 nm-300 nm. By increasing the pump source power, yellow laser outputs of 574 nm and 575 nm can be realized, and the wavelengths are shown in FIG. 2. Figure 2 Figure 2 The horizontal coordinate in FIG. 2 is wavelength (nm) and the vertical coordinate is intensity (arbitrary unit). 10 O 19 In addition, in combination with the nonlinear frequency doubling characteristics of the calcium lanthanum borate La2CaB Figure 3 Figure 3 The horizontal coordinate in FIG. 3 is phase matching angle and the vertical coordinate is wavelength (nm).

[0037] The laser switching output device 6 can realize the switching and control of yellow laser and ultraviolet laser, meeting the application requirements.

[0038] As shown in Figure 4 , Figure 5 ​​As shown, in one embodiment, the laser switching output device comprises a rotating shaft 601, the output end of the rotating shaft 601 is provided with yellow light filters 602 for outputting yellow light and ultraviolet light filters 603 for outputting ultraviolet light, the rotating shaft is driven by a rotating motor 604, when the rotating shaft rotates, the yellow light filters 602 or the ultraviolet light filters 603 can be rotated to the output light path of the laser resonant cavity. The yellow light filters 602 and the ultraviolet light filters 603 each comprise a plurality of, and each yellow light filter and each ultraviolet light filter are uniformly spaced on the output end of the rotating shaft.

[0039] In another embodiment, the yellow light filters and the ultraviolet light filters can also be selectively moved to the output light path of the laser in a lifting manner.

[0040] It is worth noting that the related structure diagram of the device in the present application is only a schematic diagram, and other connecting parts and protective parts such as shells are not shown in the schematic diagram in addition to the key parts shown in the diagram.

[0041] Example 2

[0042] As described in Example 1, except that the pump source 1 is a full solid-state frequency-doubled ultraviolet laser emitting at a wavelength of 355 nm, and other conditions are consistent with those described in Example 1.

[0043] Example 3

[0044] As described in Example 1, except that the laser crystal 4 is a dysprosium ion doped calcium lanthanum borate crystal with a length of 6 mm, 8 mm or 10 mm, and other conditions are consistent with those described in Example 1.

[0045] Example 4

[0046] As described in Example 1, except that the laser crystal 4 is a dysprosium ion doped calcium lanthanum borate crystal with a doping concentration of 1%, 2%, 3%, 10%, and other conditions are consistent with those described in Example 1.

[0047] Example 5

[0048] As described in Example 1, except that the output mirror 5 is coated with a high reflection band of 350 nm-500 nm, a transmittance of 2%-5% for a band of 550 nm-600 nm, and a transmittance of 99% for a band of 275 nm-300 nm, and other conditions are consistent with those described in Example 1.

[0049] Example 6

[0050] As described in Example 1, except that the output mirror 5 is a concave mirror with a curvature of 50 mm, 150 mm, 200 mm, and other conditions are consistent with those described in Example 1.

[0051] Example 7

[0052] As in Example 1, except that the laser crystal 4 is a dysprosium ion doped yttrium calcium oxo borate crystal YCa4O(BO3)3, with a dysprosium ion doping concentration of 0.1% to 30%.

[0053] Example 8

[0054] As in Example 1, except that the laser crystal 4 is a dysprosium ion doped yttrium aluminum borate crystal YAl3(BO3)4, with a dysprosium ion doping concentration of 0.1% to 30%.

[0055] Example 9

[0056] As in Example 1, except that the laser crystal 4 is a dysprosium ion doped sodium lanthanum borate crystal Na3La9O3(BO3)8, with a dysprosium ion doping concentration of 0.1% to 30%.

[0057] The various embodiments described in this specification are presented by way of example, and are not intended to limit the scope of the application. Each embodiment is presented in a progressive manner, with each embodiment highlighting the differences from the previous embodiment. The same or similar parts between embodiments are cross-referenced. The apparatus disclosed in the embodiments is relatively simple, as it corresponds to the method disclosed in the embodiments.

[0058] The above description of disclosed embodiments provides enabling disclosure sufficient for one of ordinary skill in the art to practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application 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.

Claims

1. A dysprosium ion-activated dual-wavelength laser for yellow and ultraviolet light, characterized in that, It includes, in sequence, a pump source, an optical focusing system, a laser resonator, and a laser switching output device; The laser resonant cavity has an input mirror and an output mirror at its two ends along the light transmission direction. One side of the input mirror is coated with a dielectric film that has high transmittance in the 350 nm-500 nm band and high reflectance in the 550 nm-600 nm and 275 nm-300 nm bands. The other side of the output mirror is coated with a dielectric film that has high reflectance in the 350 nm-500 nm band, partial transmittance in the 550 nm-600 nm band, and high transmittance in the 275 nm-300 nm band. The laser resonant cavity is filled with Dy doped material. 3+ Non-centrosymmetric borate crystals containing ions, including lanthanum calcium borate crystals (La₂CaB₂). 10 O 19 Yttrium calcium oxyborate crystals YCa4O(BO3)3, yttrium aluminum borate crystals YAl3(BO3)4, or sodium lanthanum borate crystals Na3La9O3(BO3)8; The laser switching output device is used to control and switch between the generated yellow light and ultraviolet light.

2. The dysprosium ion-activated dual-wavelength laser for yellow and ultraviolet light according to claim 1, characterized in that, In the non-centrosymmetric borate crystal, the calcium lanthanum borate crystal La2CaB 10 O 19 The space group of yttrium oxy calcium borate crystal YCa4O(BO3)3 is Cm; the space group of yttrium aluminum borate crystal YAl3(BO3)4 is R32; and the space group of sodium lanthanum borate crystal Na3La9O3(BO3)8 is P-62m.

3. The dysprosium ion-activated dual-wavelength laser for yellow and ultraviolet light according to claim 1, characterized in that, Doped Dy 3+ In non-centrosymmetric borate crystals of ions, Dy 3+ The doping concentration of ions is 0.1%-50%.

4. A dysprosium ion-activated dual-wavelength laser for yellow and ultraviolet light according to claim 1, characterized in that, The light-transmitting surfaces of the non-centrosymmetric borate crystal include circles, squares, or rectangles.

5. A dysprosium ion-activated dual-wavelength laser for yellow and ultraviolet light according to claim 1, characterized in that, The non-centrosymmetric borate crystal has a crystal length of 5 mm to 30 mm in the light transmission direction.

6. A dysprosium ion-activated dual-wavelength laser for yellow and ultraviolet light according to claim 1, characterized in that, The pump source is used to emit laser wavelengths of 350 nm-500 nm, including a blue diode laser or an all-solid-state frequency-doubled blue laser.

7. A dysprosium ion-activated dual-wavelength laser for yellow and ultraviolet light according to claim 1, characterized in that, The laser switching output device includes a rotating shaft. The output end of the rotating shaft is provided with a yellow light filter for outputting yellow light and an ultraviolet light filter for outputting ultraviolet light. When the rotating shaft rotates, the yellow light filter or the ultraviolet light filter can be rotated to the output optical path of the laser resonant cavity.

8. A dysprosium ion-activated dual-wavelength laser for yellow and ultraviolet light according to claim 7, characterized in that, The yellow light filter and the ultraviolet light filter each include multiple filters, and each yellow light filter and each ultraviolet light filter are evenly spaced at the output end of the rotating shaft.

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