NF2

NF1 and NF2 are Nd^3+ doped fluorophosphate glasses.

They have low nonlinear refractive index, high energy storage ability, broad line width, good chemical stability as well as negative temperature coefficient of optical paths.

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Laser Specifications

NdF_3 (wt%): 1.07
Nd^3+ conc. (10^20 ions / cm ^3): 1.2 ± 0.1
Cross section for stimulated emission (10^-20 cm^2): 3.4 ± 0.1

Lifetime at 1053 nm (μsec)*:

≥ 430 (NdF_3 : 0.53 wt %)

≥ 410 (NdF_3 : 1.07 wt %)

Effective bandwidth (nm): 30.4

Fluorescence peak wavelength (nm): 1053

Absorption coefficient (cm^-1):

≤ 0.001 (1053 nm)

≤ 0.04 (400 nm)

≤ 0.08 (3333 nm)

Optical Specifications

Non-linear refractive index coeff. n_2 (× 10^-13 e.s.u): ≤ 0.86

Refractive index (1053 nm): 1.514 ± 0.003

Abbe value: 77

dn/dT (10^-6 / ºC) (20 ~ 100 ºC): - 8.6

Thermal Specifications

Transformation temp. (ºC): 490

Softening temp. (ºC): 528

Coeff. of linear thermal expansion (10^-7 / K) (50 ~ 100 ºC): N/A

Coeff. of linear thermal expansion (10^-7 / K) (30 ~ 300 ºC): 142

Thermal coeff. of optical path length (10^-6 / K) (50 ~ 100 ºC): - 1.2

Thermal conductivity (25 ºC) (W / m K): N/A

Chemical Specifications

D_w (H_2O 98ºC) (mg / (cm^2/day)): 0.1

Other Specifications

Density (g / cm^3): 3.68

Young’s modulus (G Pa): 76

Knoop hardness (kg / cm^2): 423

Fracture toughness (MPa· m ^1/2): 0.58