N41

N41 is an Nd^3+ phosphate glass with high stimulated emission cross section, lower nonlinear refractive index and good thermal characteristics that is specially developed for high power laser facilities. A glass slab is up to 900 mm × 500 mm × 70 mm .

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Laser Specifications

Nd _2 O_3 (wt %): 4.6

Nd^3+ conc. (10^20 ions / cm^3): 4.3 ± 0.1

Cross section for stimulated emission (10^-20 cm^2): 3.9 ± 0.1

Lifetime at 1053 nm (μsec)*:

≥ 370 (Nd_2 O_3 : 0.5 wt %)

≥ 360 (Nd_2 O_3 : 1.2 wt %)

≥ 315 (Nd_2 O_3 : 3.5 wt %)

≥ 310 (Nd_2 O_3 : 4.6 wt %)

Effective bandwidth (nm): 25.5

Fluorescence peak wavelength (nm): 1053

Absorption coefficient (cm^-1):

≤ 0.0015 (1053 nm)

≤ 0.25 (400 nm)

≤ 1.5 (3333 nm)

Optical Specifications

Non-linear refractive index coeff. n_2 (× 10^-13 e.s.u): ≤ 1.04

Refractive index (1053 nm): 1.504 ± 0.003

Abbe value: 68.2

Thermal Specifications

Transformation temp. (ºC): 467

Softening temp. (ºC): 503

Coeff. of linear thermal expansion (10^-7 / K) (30 ~ 100 ºC): 129

Coeff. of linear thermal expansion (10^-7 / K) (30 ~ 300 ºC): 141

Chemical Specifications

D_w (H_2O 98ºC) (mg / (cm^2/day)): 0.41

Other Specifications

Density (g / cm^3): 2.62

Young’s modulus (G Pa): 52.4

Posson’s ratio: 0.25

Knoop hardness (kg / cm^2): 347

Fracture toughness (MPa· m ^1/2): 0.62

* Note: The homogeneity is about 2 × 10^-6