KBBF

KBBF
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KBe2BO3F2 (Potassium Beryllium Fluoroborate) is abbreviated as KBBF. It is an uniaxial crystal system with an R32 space group and has a wide transmission range with a UV cut-off edge of 150 nm.

Compared to crystals such as BBO and LBO, KBBF crystals also have a large thermal conductivity (LBO: 3.5 W/mK, KBBF: ~2.5 W/mK), indicating that the crystal has a high laser damage threshold.

For example, using a Nd:YAG laser (1064 nm, 80 ps, 1 kHz), the crystal has optical damage thresholds as high as 900 GW/cm2 and 72 J/cm2, which is nearly an order of magnitude greater than the anti-laser damage threshold of a BBO crystal under the same conditions. KBBF crystal is one of the crystals that can achieve a multiplicative output of deep UV lasers below 200 nm.

Features of KBe2BO3F2:

  • No moisture
  • High damage threshold
  • Small two-photon absorption
  • No photorefractive effect
  • Large refractive index
  • Direct frequency doubling output deep UV laser

Product Parameters

Crystal Structure
Uniaxial system, space group R32
Lattice Constant
a=b=4.427(4) Å，c=18.744(9) Å，Z=3
Transparency range
150 nm-3.5 μm
Thermal Conductivity
2.5 W/mK
Damage Threshold
900 GW/cm2@1064 nm
60 GW/cm2@390 nm
Sellmeier Equation
no2= 1 + 1.1713·λ2/(λ2- 0.00733)- 0.01022·λ2
ne2= 1 + 0.9316·λ2/(λ2 - 0.00675)- 0.00169·λ2

Spectra

Nonlinear crystal KBBF transmittance -CRYLINKNonlinear crystal KBBF quadruple frequency-CRYLINK
Ultraviolet region transmission spectrum of KBBF crystalThe KBBF prism coupler produces a titanium gem wide tuned quadruple output

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