偏硼酸钡

  Crystal Structure

Trigonal, space group R_3c

Cell Parameters

a = b = 12.532Ã, c = 12.717Ã…, Z = 6

Melting point

1095+ 5°C

Transition temperature

925+ 5°C

Optical homogeneity

d n ~ 10^-6/cm

Mohs hardness

4

Density

3.85 g/cm³

Absorption Coefficient

 < 0.1%/cm (at 1064nm)

Specific heat

490 J/kg/°C

Hygroscopic susceptibility

low

Thermal expansion coefficients

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

Thermal conductivity

Perpendicular to c, 1.2 W/m/°C
Parallel to c, 1.6 W/m/°C

Transparency range

189-3500 nm

Refractive indices:

n_e = 1.5425, n_o = 1.6551 @ 1064 nm
n_e = 1.5555, n_o = 1.6749 @ 532 nm
n_e = 1.6146, n_o = 1.7571 @ 266 nm

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

189 - 1750 nm

NLO coefficients

d11 = 5.8 x d₃₆ (KDP)
d₃₁= 0.05 x d₁₁
d₂₂ < 0.05 x d₁₁

Electro-optic coefficients

y₁₁ = 2.7 pm/V

Half-wave voltage

48 KV (at 1064 nm)

Damage threshold

5 GW/cm2 (10 ns) @1064nm
10 GW/cm2 (1.3 ns) @ 1064 nm
1 GW/cm2 (10 ns) @532 nm
7 GW/cm2 (250 ps) @ 532 nm