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LBO (Lithium Triborate) is a kind of non-linear optical crystal with good ultraviolet transmittance (210-2300nm), high laser damage threshold and large effective frequency doubling coefficient (about 3 times of KDP crystal). The advantages of wide receiving angle of pump light and small dispersion angle of doubled frequency light can be realized in a wide spectrum range, such as class I and II non-critical phase matching. LBO is the preferred material to make device for the generation of high power density laser harmonics, especially for ultraviolet lasers.

Technical Data [LBO]
Dimension Tolerance ± 0.1 mm
Angle Tolerance < ± 0.25°
Flatness < λ/8 @ 633 nm
Surface Quality < 10/5 [S/D]
Parallelism < 20”
Perpendicularity ≤ 5'
Chamfer ≤ 0.2mm @ 45°
Chip ≤ 0.1mm
Wavefront Distortion < λ/8 @ 633 nm
Clear Aperture > 90% central area
Coating AR-coating @ 1064nm (R<0.2%)
Laser Damage Threshold > 10 GW/cm2 for 1064nm, 10ns, 10Hz (polished only)
> 1.0 GW/cm2 for 1064nm, 10ns, 10Hz (AR-coated)
> 0.5 GW/cm2 for 532nm, 10ns, 10Hz (AR-coated)