B O C

Nd: YLF

Physical and Optical Properties:
Physical Properties:

Chemical Formula

LiY 1.0-×Nd×F4

Lattice Parameters

a=5.16Å

c=10.85Å

Crystal structure

tetragonal

Space Group

I41/a

Nd atoms/cm³

1.40×10²⁰ atoms/cm³

for 1% Nd doping

Knoop Hardness

300 kg/mm²

Melting Point

819℃

Density

3.99g/cm³

Modulus of Elasticity

85GPa

Thermal Expansion

8.3×10^-⁶/k along c axis

Coefficient

13.3×10^-⁶/k along a axis

Thermal Conductivity

0.063 W/cm K

Specific Heat

0.79 J/g K

Optical Properties

Transparency Region

180nm to 6.7μm

Peak Stimulated Emission

1.8×10^-¹⁹㎝² (E‖c) at 1.047μm

Cross Section

1.2×10^-¹⁹㎝² (E丄c) at 1.053μm

Spontaneous Fluorescence

485μs for 1% Nd

Lifetime

Scatter Losses

<0.2%/㎝

Peak Absorption Coefficient

α=10.8㎝^-¹(792.0 nm E‖c)

(for 1.2% Nd)

α=3.59㎝^-¹ (797.0 nm E丄c)

dn/dT：

Wavelength E‖c E丄c

436 nm      -2.44×10^-6/°C    -0.54×10^-6/°C
578 nm      -2.86×10^-6/°C    -0.91×10^-6/°C
1.06μm     -4.30×10^-6/°C    -2.00×10^-6/°C

Index of Refraction

Wavelength n_o n_e

      262          1.485       1.511
350          1.473       1.491
525           1.456       1.479
1050         1.448       1.470
2065         1.442       1.464

YLF exhibits tetragonal symmetry with crystallographic axes a=b≠c, which are orthogonal ,α=β=g=90º YLF is a uniaxial crystal with its optical axis aligned with the c axis. Our standard Nd:YLF is grown along the a direction.The π-transition (E‖c) occurs at 1047nm with an emission cross-section 50% greater than the σ-transition (E丄c) cross section at 1053nm.