N31 phosphate glass is specially developed for high power laser facility. N31 is a good material which has the characteristics of high energy storage, large excitation cross section and long fluorescence lifetime. It is also easy to prepare glass with large size and good optical uniformity, so it is widely used in high-power laser systems. At present, it has been successfully applied in Shen Guang Ⅱ and Shen Guang Ⅲ systems.
| Nd2O3 (wt%) | 3.5 |
| Nd3+ conc.(1020ions/cm3) | 3.4±0.1 |
| Cross section for stimulated emission(10-20cm2) | 3.8±0.1 |
| Lifetime at 1053nm(μsec) | ≥370 (Nd2O3:0.5wt%) |
| ≥360 (Nd2O3:1.2wt%) | |
| ≥315 (Nd2O3:3.5wt%) | |
| ≥310 (Nd2O3:4.2wt%) | |
| Effective bandwidth(nm) | 25.4 |
| Fluorescence peak wavelength(nm) | 1053 |
| Absorption coefficient(cm-1) | ≤0.0015(1053nm) |
| ≤0.25(400nm) | |
| ≤1.5(3333nm) |
| Non-linear refractive index coeff.n2(×10-13e.s.u) | ≤1.2 |
| Refracive index(1053nm) | 1.535±0.003 |
| Abbe value | 65.6 |
| dn/dt(10-6/℃)(20~100℃） | -4.3 |
| Transformation temp.(℃） | 445 |
| Softening temp.(℃） | 485 |
| Coeff.of linear thermal expansion (10-7/K)(30~100℃） | 116 |
| Thermal coeff. Of optical path length(10-6/K)(50~100℃） | 1.4 |
| Thermal comductive (25℃)(W/Mk) | 0.59 |
| Specific heat(25℃)(J/Gk) | 0.75 |
| Density(g/cm3) | 2.87 |
| Young’s modulus(Gpa) | 58.3 |
| Posson’ rayio | 0.26 |
| Knoop hardness(kg/cm2) | 404 |
| Fracture toughness(Mpa.m1/2) | 0.58 |
*The homogeneeity is about 2×10-6
High energy storage
Large excitation cross section
Long fluorescence lifetime
Low coefficient of nonlinearity
High damage threshold
High power laser systems
Mainly used for inertial confinement fusion physics experimental research，can provide nearly 200,000 joules, 60TW ultraviolet radiation source
Ultrashort pulse laser
Used for nonlinear laser microscopies， practical, fiber-based, high-power, wideband sources and practical optical frequency comb system
Waveguide Amplifier
Used for femtosecond laser writing method, optical communication