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KBBF (Potassium Fluoroboratoberyllate, KBe2BO3F2)

KBBF is a new nonlinear optical crystal which allows generation of depp-UV light.  The fourth-harmonic generation of Ti:sapphire laser systems from 200 nm to 179.4-nm was first achieved in KBBF. It is also the only crystal in which direct SHG of the third harmonic of Nd:YAG laser is possible ( i.e. sixth harmonic of Nd:YAG at 177nm).

Hot Applications:

WB01158_1.GIF (255 bytes) 1 mm KBBF crystal doubles 50 fs 400 nm pulses to 200 nm with an efficiency >13%. 
WB01158_1.GIF (255 bytes) 2.3mm KBBF generates 360mW at 200nm

Basic Properties of KBBF

Crystal Structure

Trigonal, Point group 32

Cell Parameters

a=4.427Å , c=18.744Å

Melting Point

1100 °C

Mohs Hardness

N/A

Transparency Range

155nm-3600nm

Sellmeier Equations
         ( λ in µm)

no2 = 1+1.169725λ2/(λ2-0.0062400)-0.009904λ2
ne2 = 1+0.956611λ2/(λ2-0.0061926)-0.027849λ2

Nonlinear Optical Properties

NLO Coefficients d11 = 0.49 pm/V
Effective NLO Coefficients dooe= d11 cosθ cos3φ
deoe=doee d11 cos2θ sin3φ
Damage Threshold

5 GW/cm2 (8 ns, 1064nm)

* KBBF crystals are not commercially available at present. The data shown on this page is for reference only. For frequency conversions to deep UV with other crystals, please contact Newlight Photonics Inc..

 

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