NAP2

NAP2 and NAP4 are Nd^3+ doped phosphate glasses that can be used for high power applications.

These phosphate glasses are two types of new laser glass with high thermal shock resistance properties, higher thermal conductivity, lower coefficient of thermal expansion and modest emission cross section. The NAP2 and NAP4 glasses can be used as active materials in laser systems with high repetition rates and high energy. They have broad applications in laser rangers, laser peening and pump lasers for OPCPA systems. The glasses can be customized with a maximum size of 400 mm × 400 mm × 70 mm.

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Laser Specifications

Cross section for stimulated emission (10^-20 cm^2): 3.6 ± 0.1

Lifetime at 1053 nm (μsec)*:

≥ 360 (Nd_2 O_3 : 0.5 wt %)

≥ 350 (Nd_2 O_3 : 1.0 wt %)

≥ 330 (Nd_2 O_3 : 2.0 wt %)

≥ 310 (Nd_2 O_3 : 3.0 wt %)

Effective bandwidth (nm): 25.4

Fluorescence peak wavelength (nm): 1052

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): ≤ 1.25

Refractive index (1053 nm): 1.537 ± 0.003

Abbe value: 67

dn/dT (10^-6 / ºC) (20 ~ 100 ºC): - 0.9

Thermal Specifications

Transformation temp. (ºC): 500

Softening temp. (ºC): 550

Coeff. of linear thermal expansion (10^-7 / K) (30 ~ 100 ºC): 87

Coeff. of linear thermal expansion (10^-7 / K) (30 ~ 300 ºC): 95

Thermal coeff. of optical path length (10^-6 / K) (50 ~ 100 ºC): 3.8

Thermal conductivity (25 ºC) (W / m K): 0.76

Specific heat ( 25 ºC) (J / g K): 0.757

Chemical Specifications

D_w (H_2O 98ºC) (mg / (cm^2/day)): 0.003

Other Specifications

Density (g / cm^3): 2.84

Young’s modulus (G Pa): 58

Posson’s ratio: 0.25

Knoop hardness (kg / cm^2): 382

Fracture toughness (MPa· m ^1/2): 0.68