三硼酸锂(LBO)

Chemical Formula

LiB₃O₅

Crystal Structure

Orthorhombic, mm2

Cell Parameters

a = 8.4473, b = 7.3788Å, c = 5.1395Å, Z = 2

Melting point

834°C

Optical homogeneity

d n ~ 10^-6/cm

Mohs hardness

6

Density

2.47 g/cm³

Absorption coefficient

< 0.1%/cm (at 1064nm and 532nm)

Specific heat

1.91J/cm³xK

Hygroscopic susceptibility

low

Thermal expansion coefficients

a, 4 x 10^-6/K; c, 36 x 10^-6/K

Thermal conductivity

^ c, 1.2 W/m/K; //c, 1.6 W/m/K

Transparency range

160-2600nm

Refractive indices:

at 1064nm
at 532nm
at 355nm

n_x = 1.5656, n_y = 1.5905, n_z = 1.6055 (at 1064nm)

n_e = 1.5785, n_o = 1.6065, n_z = 1.6212
n_e = 1.5971, n_o = 1.6275, n_z = 1.6430

Therm-optic coefficients

dn_o/dT = -9.3 x 10^-6/°C
dn_e/dT = -16.6 x 10^-6/°C

Sellmeier Equations (l in mm)

n_o² (l) = 2.7359 - 0.01354l²+ 0.01878/(l²-0.01822)
ne²(l) = 2.3753 - 0.01516l²+ 0.01224/(l²-0.01667)

Phase-matchable output wavelength

554 - 2660nm (type I), 790 – 2150nm (type II)

NLO coefficients

d₃₃ = 0.06; d₃₂ = 1.2; d₂₂ = 1.1

Walk-off Angles(@ 1064nm)

0.4° (Type I SHG), 0.3° (Type II SHG)

Acceptance Angles(@1064nm) for SHG Type I

9.6(mrad-cm) CPM at 25°C 248(mrad-cm) NCPM at 150°C

Electro-optic coefficients

g ₁₁ = 2.7 pm/V, g ₂₂, g₃₁ < 0.1g₁₁

Conversion Efficiency

>90% (1064 -> 532nm) Type I SHG

Damage threshold

45 GW/cm² (1 ns)@1064nm