LBO (Lithium Triborate)

Lithium Tri-borate (LBO) is one of the most useful nonlinear optical material not just for its relatively large conversion coefficient - 3x that of KDP, but also for its excellent physical properties.

 

GAMDAN LBO offers

  • Exceptionally low <10ppm/cm fully calibrated absorption @1064nm (3-5x lower than competition), as tested by Photo-thermal Common-Path Interferometry. (Test results available upon request)
  • Excellent Homogeneity, WFD of ?/10 @633nm
  • Exceptional UV grade super polish for optimal high-power performance, Roughness: <3?, S/D of 0/0
  • LiDT of 30J/cm2 @1064nm, 15J/cm2@532nm, 7J/cm2@355nm
  • Size up to 30x30mm cross section, or 60mm in length

 

In addition to LBO’s intrinsic advantages

  • Broad transparency range from 160nm to 2600nm
  • High damage threshold
  • Wide acceptance angle and small walk-off
  • Type I and type II NCPM
  • Spectral NCPM near 1300nm

 

Made in the USA

 

Crystal Structure and Physical Properties

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

 

Linear Optical Properties

Transparency range 160-2600nm
Refractive indices:
at 1064nm
at 532nm
at 355nm
nx = 1.5656, ny = 1.5905, nz = 1.6055
ne = 1.5785, no = 1.6065, nz = 1.6212
ne = 1.5971, no = 1.6275, nz = 1.6430
Therm-optic coefficients dno/dT = -9.3 x 10-6/°C
dne/dT = -16.6 x 10-6/°C
Sellmeier Equations (l in mm)
no2 (l) = 2.7359 - 0.01354l2+ 0.01878/(l2-0.01822)
ne2(l) = 2.3753 - 0.01516l2+ 0.01224/(l2-0.01667)

 

Nonlinear Optical Properties

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
at 1064nm
at 532nm
at 355nm
45 GW/cm2 (1 ns); 10 GW/cm2 (1.3 ns)
26 GW/cm2 (1 ns); 7 GW/cm2 (250 ps)
22 GW/cm2

 

Download in PDF Format:

Datasheet (PDF)