Phosphate laser neodymium glass and its preparation method

Abstract

This application provides a lead-free phosphate laser neodymium glass with adjustable refractive index temperature coefficient, low nonlinear refractive index, and high gain, and a method for its preparation. The phosphate laser neodymium glass, in molar percentage, contains: P2O5: 59.80–68.20%; Al2O3: 3.00–7.20%; ZnO: 0.30–10.30%; BaO: 0.20–8.90%; MgO: 0.20–8.00%; K2O: 6.00–26.10%; Li2O: 0.00–15.70%; Y2O3: 0.15–2.05%; Nd2O3: 1.15–1.25%; and alkali metal oxide R2O: 7.00–26.50%; wherein R2O is one or more of Li2O and K2O.

Description

Technical Field

[0001] This application belongs to the field of laser glass, specifically relating to a lead-free phosphate laser neodymium glass with adjustable temperature coefficient of refractive index, low nonlinear refractive index and high gain, and its preparation method. Background Technology

[0002] Neodymium glass for lasers, with its superior spectral properties and excellent energy storage capacity, has become a core gain medium for high-power solid-state laser devices. It is not only an important material for modern advanced laser manufacturing and basic scientific research, but also a key cornerstone for inertial confinement fusion (ICF) research. As research into laser fusion energy deepens, the performance of laser drivers faces increasingly stringent challenges. Traditional low-repetition-rate operation modes are no longer sufficient to meet practical requirements, and laser glass must evolve to adapt to high-repetition-rate operation. However, this technological leap faces enormous challenges, with thermal management becoming a core bottleneck restricting its development.

[0003] In high-repetition-rate operating environments, heat accumulation inevitably occurs within the laser medium, leading to severe optical thermal distortion. This thermal distortion not only damages the wavefront quality of the output beam and significantly reduces beam quality, but can also induce devastating component damage. The severity of thermal distortion is primarily determined by the material's thermo-optic coefficient, which is influenced by the combined effects of the refractive index temperature coefficient, the coefficient of thermal expansion, and the refractive index. Among these, the refractive index temperature coefficient is the key variable dominating the order of magnitude and sign of the thermo-optic coefficient. Therefore, achieving precise design of the refractive index temperature coefficient through component control, and coordinating low expansion characteristics to optimize the thermo-optic coefficient, is the core approach to achieving optimized thermal management.

[0004] In laser glass, the temperature coefficient of refractive index directly characterizes the temperature-induced refractive index drift and is a core factor contributing to thermal lensing, optical path distortion, and beam quality degradation. Simply optimizing the thermo-optical coefficient is insufficient to fully characterize the optical response under real thermal loading; therefore, in-depth research into the control of the temperature coefficient of refractive index is crucial for improving the thermal stability and output performance of laser glass. Summary of the Invention

[0005] The technical problem to be solved by this application is to provide a lead-free phosphate laser neodymium glass with adjustable refractive index temperature coefficient, low nonlinear refractive index and high gain, and a method for preparing the same.

[0006] The solution adopted by this application to solve the above-mentioned technical problems is:

[0007] The phosphate laser neodymium glass, in molar percentage, contains: P2O5: 59.80–68.20%; Al2O3: 3.00–7.20%; ZnO: 0.30–10.30%; BaO: 0.20–8.90%; MgO: 0.20–8.00%; K2O: 6.00–26.10%; Li2O: 0.00–15.70%; Y2O3: 0.15–2.05%; Nd2O3: 1.15–1.25%; alkali metal oxide R2O: 7.00–26.50%; wherein R2O is one or more of Li2O and K2O.

[0008] Furthermore, wherein: P2O5: 59.84–62.50%; and / or Al2O3: 4.00–6.50%; and / or ZnO: 0.30–2.50%; and / or BaO: 0.20–4.55%; and / or MgO: 3.00–8.00%; and / or K2O: 10.00–26.08%; and / or Li2O: 0.20–10.20%; and / or Y2O3: 0.95–2.03%; and / or Nd2O3: 1.15–1.25%; and / or alkali metal oxide R2O: 19.40–26.39%; wherein R2O is one or more of Li2O and K2O.

[0009] Furthermore, its components, expressed as molar percentages, satisfy one or more of the following conditions:

[0010] (1) [100×MgO×(K2O-BaO)×Y2O3] / [P2O5×Nd2O3] is 0.01~4.70;

[0011] (2) [K2O×(1 / ZnO+1 / Al2O3+1 / MgO+1 / Y2O3)] is 15.9~90.5.

[0012] Furthermore, its components, expressed as molar percentages, satisfy one or more of the following conditions:

[0013] (1) [100×MgO×(K2O-BaO)×Y2O3] / [P2O5×Nd2O3] is 1.23~4.64;

[0014] (2) [K2O×(1 / ZnO+1 / Al2O3+1 / MgO+1 / Y2O3)] is 43.0~84.0.

[0015] Furthermore, the nonlinear refractive index n2 of the glass is ≤1.23×10⁻⁶. -13 esu.

[0016] Furthermore, the nonlinear refractive index n2 of the glass is ≤1.07×10⁻⁶. -13 esu.

[0017] Furthermore, the refractive index temperature coefficient dn / dT of the glass is -7.0 to 1.5 (10). 6 / K).

[0018] Furthermore, the refractive index temperature coefficient dn / dT of the glass is -7.0 to -4.6 (10). 6 / K).

[0019] Furthermore, the stimulated emission cross section σem of the glass is ≥3.2×10⁻⁶. -20 cm 2 The optional value is σem≥3.8×10. -20 cm 2 .

[0020] The above-mentioned method for preparing phosphate laser neodymium glass includes the following steps:

[0021] The components are melted at 1100–1300°C with controlled melting atmosphere, clarified, homogenized and then cooled; then poured into a metal mold to form, and annealed and cooled to obtain the phosphate laser neodymium glass.

[0022] Compared with the prior art, the beneficial effects of this application are as follows:

[0023] By rationally configuring the components and their contents, the laser neodymium glass obtained in this application features an adjustable temperature coefficient of refractive index, low nonlinear refractive index, and high stimulated emission cross-section. This is beneficial for optimizing the thermal management of laser glass, improving thermal distortion, and enhancing equipment stability and laser quality in high-power or continuous output scenarios. This application does not contain lead, cadmium, arsenic, or other compounds, and the production process generates no waste, making it environmentally friendly. It can be widely used in industrial processing and manufacturing, medical applications, and laser inertial confinement fusion. Detailed Implementation

[0024] The composition and function of the glass of this application will be described in detail below. It should be noted that, unless otherwise specified, the content of each component is expressed as a molar percentage (mol%) relative to the total amount of laser glass material converted into oxides. Here, "converted into oxides" means that when the oxides, complex salts, and hydroxides used as raw materials for the laser glass of this application decompose and transform into oxides upon melting, the total molar amount of such oxides is taken as 100%.

[0025] Unless otherwise specified in the specific context, the numerical ranges listed herein include upper and lower limits. "Above" and "below" include endpoint values ​​and all integers and fractions within the range, not limited to the specific values ​​listed when the range is defined. The term "about" as used herein means that recipes, parameters, and other quantities and characteristics are not, and need not be, exact, and may be approximate and / or larger or lower if necessary, reflecting tolerances, conversion factors, and measurement errors, etc. The term "and / or" as used herein is inclusive; for example, "A; and / or B" means only A, or only B, or both A and B.

[0026] Alkali metal oxides are the outer layer of the glass network, which can reduce the viscosity of glass during high-temperature melting and lower the melting temperature. However, excessive introduction of alkali metal oxides will increase the tendency of glass crystallization and phase separation, and reduce the chemical stability of the glass. Too little will make the glass viscosity too high, making it difficult to melt. The alkali metal oxide R2O present in this application includes one or more of Li2O and K2O, wherein the content of Li2O is 0.00-15.70%, optionally 0.20-10.20%; the content of K2O is 6.00-26.10%, optionally 10.00-26.08%; and the content of R2O ranges from 7.00-26.50%, optionally 19.40-26.39%.

[0027] In some embodiments, the Li₂O content can be 0, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.2%, 1.5%, 1.8%, 2%, 2.2%, 2.5%, 2.8%, 3%, 3.2%, 3.5%, 3.8%, 4%, 4.2%, 4.5%, 4.8%, 5%, 5.2%, 5.5%, 5.8%, 6%, 6.2%, 6.5%, 6.8%, 7%, 7.2%, 7.5%, 7%. 8%, 8%, 8.2%, 8.5%, 8.8%, 9%, 9.2%, 9.5%, 9.8%, 10%, 10.2%, 10.5%, 10.8%, 11%, 11.2%, 11.5%, 11.8%, 12%, 12.2%, 12.5%, 12.8%, 13%, 13.2%, 13.5%, 13.8%, 14%, 14.2%, 14.5%, 14.8%, 15%, 15.2%, 15.5%, 15.7%, etc., as well as all ranges and sub-ranges between the above values. It should be understood that, in the implementation scheme, any of the above ranges can be combined with any other range.

[0028] In some embodiments, the K₂O content can be 6%, 6.2%, 6.5%, 6.8%, 7%, 7.2%, 7.5%, 7.8%, 8%, 8.2%, 8.5%, 8.8%, 9%, 9.2%, 9.5%, 9.8%, 10%, 10.2%, 10.5%, 10.8%, 11%, 11.2%, 11.5%, 11.8%, 12%, 12.2%, 12.5%, 12.8%, 13%, 13.2%, 13.5%, 13.8%, 14%, 14.2%, 14.5%, 14.8%, 15%, 15.2%, 15.5%, 15.8%, 16%, 6.2%, 16.5%. The percentages are 16.8%, 17%, 17.2%, 17.5%, 17.8%, 18%, 18.2%, 18.5%, 18.8%, 19%, 19.2%, 19.5%, 19.8%, 20%, 20.2%, 20.5%, 20.8%, 21%, 21.2%, 21.5%, 21.8%, 22%, 22.2%, 22.5%, 22.8%, 23%, 23.2%, 23.5%, 23.8%, 24%, 24.2%, 24.5%, 24.8%, 25%, 25.2%, 25.5%, 25.8%, 26%, 26.1%, etc., as well as all ranges and sub-ranges between the above values. It should be understood that, in the implementation scheme, any of the above ranges can be combined with any other range.

[0029] In some embodiments, the R2O content can be 7%, 7.2%, 7.5%, 7.8%, 8%, 8.2%, 8.5%, 8.8%, 9%, 9.2%, 9.5%, 9.8%, 10%, 10.2%, 10.5%, 10.8%, 11%, 11.2%, 11.5%, 11.8%, 12%, 12.2%, 12.5%, 12.8%, 13%, 13.2%, 13.5%, 13.8%, 14%, 14.2%, 14.5%, 14.8%, 15%, 15.2%, 15.5%, 15.8%, 16%, 6.2%, 16.5%, 16.8%, or 17%. 17.2%, 17.5%, 17.8%, 18%, 18.2%, 18.5%, 18.8%, 19%, 19.2%, 19.5%, 19.8%, 20%, 20.2%, 20.5%, 20.8%, 21%, 21.2%, 21.5%, 21.8%, 22%, 22.2%, 22.5%, 22.8%, 23%, 23.2%, 23.5%, 23.8%, 24%, 24.2%, 24.5%, 24.8%, 25%, 25.2%, 25.5%, 25.8%, 26%, 26.2%, 26.5%, etc., as well as all ranges and subranges between the above values. It should be understood that, in the implementation scheme, any of the above ranges can be combined with any other range.

[0030] Alkaline earth metal oxides MgO and BaO can improve the physicochemical properties of glass, but excessive introduction can make glass melting difficult. In this application, the MgO content ranges from 0.20% to 8.00%, and can be selected from 3.00% to 8.00%; the BaO content ranges from 0.20% to 8.90%, and can be selected from 0.20% to 4.55%.

[0031] In some embodiments, the MgO content can be 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.2%, 1.5%, 1.8%, 2%, 2.2%, 2.5%, 2.8%, 3%, 3.2%, 3.5%, 3.8%, 4%, 4.2%, 4.5%, 4.8%, 5%, 5.2%, 5.5%, 5.8%, 6%, 6.2%, 6.5%, 6.8%, 7%, 7.2%, 7.5%, 7.8%, 8%, etc., as well as all ranges and sub-ranges between the above values. It should be understood that, in embodiments, any of the above ranges can be combined with any other range.

[0032] In some embodiments, the BaO content can be 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.2%, 1.5%, 1.8%, 2%, 2.2%, 2.5%, 2.8%, 3%, 3.2%, 3.5%, 3.8%, 4%, 4.2%, 4.5%, 4.8%, 5%, 5.2%, 5.5%, 5.8%, 6%, 6.2%, 6.5%, 6.8%, 7%, 7.2%, 7.5%, 7.8%, 8%, 8.2%, 8.5%, 8.9%, etc., as well as all ranges and sub-ranges between the above values. It should be understood that, in embodiments, any of the above ranges can be combined with any other range.

[0033] Al₂O₃, as a network intermediate, exhibits both glass-forming and glass-modifying properties. Al can form aluminum-oxygen tetrahedra with double-bonded oxygen atoms in glass, improving the glass's thermal and chemical stability. However, excessive Al₂O₃ can reduce the stimulated emission cross-section of the laser glass. In this application, the Al₂O₃ content ranges from 3.00% to 7.20%, and can optionally be from 4.00% to 6.50%.

[0034] In some embodiments, the Al2O3 content can be 3%, 3.2%, 3.5%, 3.8%, 4%, 4.2%, 4.5%, 4.8%, 5%, 5.2%, 5.5%, 5.8%, 6%, 6.2%, 6.5%, 6.8%, 7%, 7.2%, etc., as well as all ranges and sub-ranges between the above values. It should be understood that, in embodiments, any of the above ranges can be combined with any other range.

[0035] ZnO is a glass intermediate oxide. When there is sufficient free oxygen, its coordination number can be reduced from 6 to 4 to enter the network structure. An appropriate amount of ZnO can reduce high-temperature viscosity, while excessive ZnO content will increase the tendency for crystallization. In this application, the ZnO content ranges from 0.30% to 10.30%, and can be optionally from 0.30% to 2.50%.

[0036] In some embodiments, the ZnO content can be 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.2%, 1.5%, 1.8%, 2%, 2.2%, 2.5%, 2.8%, 3%, 3.2%, 3.5%, 3.8%, 4%, 4.2%, 4.5%, 4.8%, 5%, 5.2%, 5.5%, 5.8%, 6%, 6.2%, 6.5%, 6.8%, 7%, 7.2%, 7.5%, 7.8%, 8%, 8.2%, 8.5%, 8.8%, 9%, 9.2%, 9.5%, 9.8%, 10%, 10.2%, 10.3%, etc., as well as all ranges and sub-ranges between the above values. It should be understood that, in embodiments, any of the above ranges can be combined with any other range.

[0037] Y 3+ It possesses high field strength and high charge characteristics, and as the outer body of a glass network, it is located in the network voids, enabling it to capture free oxygen and improve structural stability. However, excessively high Y... 3+ The content will also affect the Nd content at the laser emission center. 3+ The strong ion field environment leads to a decrease in luminescence intensity. In this application, the Y2O3 content ranges from 0.15% to 2.05%, and can be selected as 0.95% to 2.03%.

[0038] In some embodiments, the content of Y₂O₃ can be 0.15%, 0.2%, 0.25%, 0.3%, 0.35%, 0.4%, 0.45%, 0.5%, 0.55%, 0.6%, 0.65%, 0.7%, 0.75%, 0.8%, 0.85%, 0.9%, 0.95%, 1%, 1.05%, 1.1%, 1.15%, 1.2%, 1.25%, 1.3%, 1.35%, 1.4%, 1.45%, 1.5%, 1.55%, 1.6%, 1.65%, 1.75%, 1.85%, 1.95%, 2%, 2.05%, etc., as well as all ranges and sub-ranges between the above values. It should be understood that, in embodiments, any of the above ranges can be combined with any other range.

[0039] P2O5, as the main glass network formant, has a content ranging from 59.80% to 68.20% in this application, and can optionally be from 59.84% to 62.50%.

[0040] In some embodiments, the P2O5 content can be 59.8%, 59.9%, 60%, 60.2%, 60.5%, 60.8%, 61%, 61.2%, 61.5%, 61.8%, 62%, 62.2%, 62.5%, 62.8%, 63%, 63.2%, 63.5%, 63.8%, 64%, 64.2%, 64.5%, 64.8%, 65%, 65.2%, 65.5%, 65.8%, 66%, 66.2%, 66.5%, 66.8%, 67%, 67.2%, 67.5%, 67.8%, 68%, 68.2%, etc., as well as all ranges and sub-ranges between the above values. It should be understood that, in embodiments, any of the above ranges can be combined with any other range.

[0041] The laser emission center of the glass in this application is Nd. 3+ The Nd₂O₃ content has a significant impact on the laser performance of laser glass. Increasing the content can increase the number of luminescent centers, but excessive Nd₂O₃ will cause concentration quenching, leading to a decrease in the stimulated emission cross section and radiation lifetime. In this application, the Nd₂O₃ content is between 1.15% and 1.25%.

[0042] In some embodiments, the Nd₂O₃ content can be 1.15%, 1.16%, 1.17%, 1.18%, 1.19%, 1.2%, 1.21%, 1.22%, 1.23%, 1.24%, 1.25%, etc., as well as all ranges and sub-ranges between the above values. It should be understood that, in embodiments, any of the above ranges can be combined with any other range.

[0043] The inventors of this application have conducted repeated experiments and research:

[0044] As the ratio [100×MgO×(K2O-BaO)×Y2O3] / [P2O5×Nd2O3] increases, the temperature coefficient of refractive index of the glass gradually decreases. In this application, [100×MgO×(K2O-BaO)×Y2O3] / [P2O5×Nd2O3] is limited to 0.01 to 4.70, and can be optionally 1.23 to 4.64. Within the range of [100×MgO×(K2O-BaO)×Y2O3] / [P2O5×Nd2O3] in this application, the temperature coefficient of refractive index of the glass is obtained in the range of [(-7.0~1.5)×10⁻⁶]. -6 / K], can be selected as [(-7.0~-4.6)×10 -6 / K).

[0045] In some implementations, [100×MgO×(K2O-BaO)×Y2O3] / [P2O5×Nd2O3] can be 0.01, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4, 4.1, 4.2, 4.3, 4.4, 4.5, 4.6, 4.7, etc., as well as all ranges and subranges between the above values. It should be understood that, in the implementation plan, any of the above scopes can be combined with any other scopes.

[0046] As the ratio of [K2O×(1 / ZnO+1 / Al2O3+1 / MgO+1 / Y2O3)] increases, the stimulated emission cross-section of the laser glass first increases and then decreases. In this application, the ratio of [K2O×(1 / ZnO+1 / Al2O3+1 / MgO+1 / Y2O3)] is limited to 15.9 to 90.5, and can be optionally 43.0 to 84.0. Within the range of [K2O×(1 / ZnO+1 / Al2O3+1 / MgO+1 / Y2O3)] defined in this application, the stimulated emission cross-section of the laser glass is obtained in the range of 3.2×10⁻⁶. -20 cm 2 The above, for example, [(3.2~4.3)×10 -20 cm 2 ], 3.8×10 -20 cm 2 The above can be selected, for example, [(3.8~4.3)×10]. -20 cm 2 ].

[0047] In some implementations, [K2O×(1 / ZnO+1 / Al2O3+1 / MgO+1 / Y2O3)] can be 15.9, 18, 20, 22, 25, 28, 30, 32, 35, 38, 40, 42, 45, 48, 50, 52, 55, 58, 60, 62, 65, 68, 70, 72, 75, 78, 80, 82, 85, 88, 90, 90.5, etc., as well as all ranges and subranges between the above values. It should be understood that, in implementations, any of the above ranges can be combined with any other range.

[0048] The method for preparing laser glass according to this application includes the following steps: melting each component at 1100-1300℃ while controlling the melting atmosphere, clarifying, homogenizing, and then cooling; then pouring the melt into a metal mold for molding, and performing annealing treatment, cooling to obtain the phosphate laser neodymium glass. Optionally, the raw materials corresponding to each component of the glass are weighed according to the proportions of this application, thoroughly mixed, and added to a quartz crucible, melted at 1100-1300℃ while carefully controlling the atmosphere, clarifying, homogenizing, and then cooling; pouring the molten glass into a metal mold preheated to about 400℃ for molding, and circulating cooling air is introduced to ensure that the glass does not crystallize; placing the molded glass and the metal mold together in an annealing furnace for heat preservation and annealing, and cooling with the furnace after power is turned off to obtain laser neodymium glass with adjustable refractive index temperature coefficient, low nonlinear refractive index, and high gain.

[0049] The terms "not containing" and "0" used herein mean that the compound, molecule, or element was not intentionally added as a raw material to the laser neodymium glass of this application. However, as raw materials and / or equipment used in the production of laser neodymium glass, there may be certain impurities or components that are not intentionally added, which may be present in small or trace amounts in the final laser neodymium glass. Such cases are also within the scope of protection of this application.

[0050] The test methods for various indicators of the laser glass in this application are as follows:

[0051] [Simulated Emission Section]

[0052] Laser performance can be obtained based on the Judd-Oflet and Fuchtbauer-Ladenburg theories. Discussions of these theories can be found in E. Desurvire, Erbium Doped Fiber Amplifiers, John Wiley and Sons (1994). Both theories evaluate laser performance based on fluorescence emission curves. In this paper, the fluorescence emission spectrum excited at 460 nm was measured using a FluoroLog-3 fluorescence spectrometer.

[0053] For neodymium laser glasses, the stimulated emission cross section is typically calculated using the Judd-Oflet theory combined with the Fuchtbauer-Ladenburg theory. A detailed description is provided in Hu Lili et al., Laser Glass and Its Applications, Shanghai Science and Technology Press (2019), which is incorporated herein by reference. MD Shinn et al., Optical transitions of Er 3+The ions of fluorozirconate glass are also described in Physical Review B (1983), which is cited and incorporated herein by reference.

[0054] The stimulated emission cross section is determined by the following formula (1):

[0055] (1)

[0056] Where I(λ) is the fluorescence emission curve obtained by fluorescence spectrophotometer, and A is the spontaneous emission transition probability between the upper and lower energy levels.

[0057] Temperature coefficient of refractive index

[0058] This application utilizes a Shimadzu GMR-1D refractive index meter to test the temperature coefficient of refractive index of glass materials. The test method is based on the national standard: Test Methods for Colorless Optical Glass Part 4: Temperature Coefficient of Refractive Index; Standard No.: GB / T7962.4-2010.

[0059] [Nonlinear Refractive Index]

[0060] Based on the relationship between the nonlinear refractive index and the dispersion characteristics of laser materials, the nonlinear refractive index is calculated as shown in formula (2):

[0061] (2)

[0062] Among them, υ d n is the dispersion coefficient of the material; d The refractive index at 587.6 nm. The nonlinear refractive index obtained from the above formula is in units of 10. -13 esu.

[0063] This paper uses a V-prism refractometer to measure the refractive index n of glass at 587.6 nm. d The refractive index n at 486.1 nm F The refractive index n at 656.3 nm C .

[0064] The dispersion coefficient is obtained through υ d It can be obtained through the following formula (3):

[0065] υ d =(n d -1) / (n F -n C (3)

[0066] The test method is based on the national standard: Test Methods for Colorless Optical Glass Part 1: Refractive Index and Dispersion Coefficient; Standard No.: GB / T 7962.1-2010.

[0067] The laser glass of this application has the following properties:

[0068] 1) The nonlinear refractive index n2 of the laser neodymium glass in this application is ≤1.23×10⁻⁶. -13 esu, can be selected as n2≤1.07×10 -13 esu。。。

[0069] 2) The refractive index temperature coefficient dn / dT of the laser neodymium glass in this application is in the range of (-7.0~1.5)×10⁻⁶. 6 / K, which can be selected as (-7.0~-4.6)×10 6 / K。。

[0070] 3) The stimulated emission cross section σ of the laser neodymium glass of this application em ≥3.2×10 -20 cm 2 , can be σ em ≥3.8×10 -20 cm 2 .

[0071] Example

[0072] To further clarify and illustrate the technical solution of this application, the following non-limiting embodiments are provided.

[0073] In these embodiments E1 to E14, the laser glasses shown in Tables 1 to 3 were obtained using the manufacturing method of this application. Furthermore, the characteristics of each laser glass were measured using the testing method described in this application, and the measurement results are shown in Tables 1 to 3.

[0074] Table 1

[0075]

[0076] Table 2

[0077]

[0078] Table 3

[0079]

[0080] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0081] The embodiments described above are merely illustrative of several implementation methods of this application, designed to facilitate a detailed understanding of the technical solutions of this application, but should not be construed as limiting the scope of protection of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. It should be understood that technical solutions obtained by those skilled in the art based on the technical solutions provided in this application through logical analysis, reasoning, or limited experimentation are all within the scope of protection of the appended claims. Therefore, the scope of protection of this application should be determined by the content of the appended claims, and the specification can be used to interpret the content of the claims.

Claims

1. A phosphate laser neodymium glass, characterized in that, Its components, expressed as a molar percentage, contain: P2O5: 59.80–68.20%; Al2O3: 3.00–7.20%; ZnO: 0.30–10.30%; BaO: 0.20–8.90%; MgO: 0.20–8.00%; K2O: 6.00–26.10%; Li2O: 0.00–15.70%; Y2O3: 0.15–2.05%; Nd2O3: 1.15–1.25%; Alkali metal oxide R2O: 7.00–26.50%; wherein, R2O is one or more of Li2O and K2O.

2. The phosphate laser neodymium glass according to claim 1, characterized in that, Its components are expressed as molar percentages, of which: P2O5: 59.84–62.50%; and / or Al2O3: 4.00–6.50%; and / or ZnO: 0.30–2.50%; and / or BaO: 0.20–4.55%; and / or MgO: 3.00–8.00%; and / or K2O: 10.00–26.08%; and / or Li2O: 0.20–10.20%; and / or Y2O3: 0.95–2.03%; and / or Nd2O3: 1.15–1.25%; and / or alkali metal oxide R2O: 19.40–26.39%; wherein R2O is one or more of Li2O and K2O.

3. The phosphate laser neodymium glass according to claim 1, characterized in that, Its components, expressed as molar percentages, meet one or more of the following conditions: (1) [100×MgO×(K2O-BaO)×Y2O3] / [P2O5×Nd2O3] is 0.01~4.70; (2) [K2O×(1 / ZnO+1 / Al2O3+1 / MgO+1 / Y2O3)] is 15.9~90.

5.

4. The phosphate laser neodymium glass according to claim 1, characterized in that, Its components, expressed as molar percentages, meet one or more of the following conditions: (1) [100×MgO×(K2O-BaO)×Y2O3] / [P2O5×Nd2O3] is 1.23~4.64; (2) [K2O×(1 / ZnO+1 / Al2O3+1 / MgO+1 / Y2O3)] is 43.0~84.

0.

5. The phosphate laser neodymium glass according to any one of claims 1 to 4, characterized in that, The nonlinear refractive index of the glass is n2 ≤ 1.23 × 10⁻⁶. -13 esu.

6. The phosphate laser neodymium glass according to any one of claims 1 to 4, characterized in that, The nonlinear refractive index n2 of the glass is ≤1.07×10⁻⁶. -13 esu.

7. The phosphate laser neodymium glass according to any one of claims 1 to 4, characterized in that, The refractive index temperature coefficient dn / dT of the glass is -7.0 to 1.5 (10). 6 / K).

8. The phosphate laser neodymium glass according to any one of claims 1 to 4, characterized in that, The refractive index temperature coefficient dn / dT of the glass is -7.0 to -4.6 (10). 6 / K).

9. The phosphate laser neodymium glass according to any one of claims 1 to 4, characterized in that, The stimulated emission cross section σem of the glass is ≥3.2×10⁻⁶. -20 cm 2 The optional value is σem≥3.8×10. -20 cm 2 .

10. A method for preparing phosphate laser neodymium glass according to any one of claims 1 to 9, characterized in that, Includes the following steps: The components are melted at 1100–1300°C with controlled melting atmosphere, clarified, homogenized and then cooled; then poured into a metal mold to form, and annealed and cooled to obtain the phosphate laser neodymium glass.

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