Neodymium-doped glass NAP2
N₃₁ phosphate glass was developed for high-power laser equipment. It offers high energy storage, a large stimulated-emission cross section and a long fluorescence lifetime, and can readily be made in large sizes with good optical homogeneity. It is widely used in high-power laser systems and has been successfully applied in the Shenguang Ⅱ and Shenguang Ⅲ systems. N₄₁ neodymium-doped phosphate glass offers a high stimulated-emission cross section, a low nonlinear refractive index and good thermal properties, making it particularly suitable for high-power laser equipment. N₄₁ has a lower refractive index than N₂₁ and N₃₁. N₅₁ neodymium-doped phosphate glass offers high energy storage, a large stimulated-emission cross section, a long fluorescence lifetime and easy preparation in large sizes with good optical homogeneity, and is widely used as an amplifier medium in high-power laser systems. NAP neodymium-doped phosphate glass was developed for high-average-power applications. NAP2 and NAP4 are new laser glasses with high thermal-shock resistance, high thermal conductivity, low thermal expansion and moderate emission cross sections. They serve high-repetition-rate, high-energy-rate and high-energy laser systems, with applications in laser rangefinders, laser peening and pump lasers in OPCPA systems. NF neodymium-doped fluorophosphate glass offers a low nonlinear coefficient, a long fluorescence lifetime, scalable preparation, good glass-forming properties and good resistance to crystallization, meeting energy-storage and amplification requirements of high-energy laser systems. There are two NF glass types. NSG₂ neodymium-doped silicate glass uses neodymium as the active ion and silicate glass as the host. It offers a large stimulated-emission cross section, broad effective fluorescence linewidth and good laser and gain performance. It is widely applicable to laser manufacture. The broader glass linewidth and availability of shorter ultrashort pulses make it a preferred material for high-energy, high-peak-power lasers.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Stimulated emission cross section | 3.6±0.1 10⁻²⁰cm² |
| Lifetime at 1053nm | ≥360(Nd₂O₃：0.5wt%) |
| Lifetime at 1053nm | ≥350(Nd₂O₃：1.0wt%) |
| Lifetime at 1053nm | ≥330(Nd₂O₃：2.0wt%) |
| Lifetime at 1053nm | ≥310(Nd₂O₃：3.0wt%) |
| Effective bandwidth | 25.4 nm |
| Fluorescence peak wavelength | 1052 nm |
| Absorption coefficient [1053nm] | ≤0.0015(1053nm) |
| Absorption coefficient [400nm] | ≤0.25(400nm) |
| Absorption coefficient [3333nm] | ≤1.5(3333nm) |
| Nonlinear refractive-index coefficient n² | ≤1.25 ×10⁻¹³e.s.u |
| Refractive Index [1053 nm] | 1.537±0.003 |
| Abbe value | 67 |
| Transition temperature | 500 ℃ |
| Softening temperature | 550 ℃ |
| Linear coefficient of thermal expansion [30〜100℃] | 87 10⁻⁷ / K |
| Thermal coefficient of optical path length [50〜100℃] | 3.8 10⁻⁶/ K |
| Heat conduction [25℃] | 0.76 W / Mk |
| Specific heat capacity [25℃] | 0.757 J / Gk |
| Density | 2.84 g/cm³ |
| Young's modulus | 58 Gpa |
| Poisson's ratio | 0.25 |
| Knoop hardness | 382 kg/cm² |
| Mpa.m1 / 2 | 0.68 |
| Deliquescence coefficient (mg / (cm² /day)) [H₂O 98℃] | 0.003 |
Datasheet
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