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Group Velocity Delay Compensator α-BBO 600/300nm, Apeture 12mm, 200-500fs

Code: 2116-009



Materials α-BBO Aperture Diameter 12mm
Wavelength 600/300nm Delay Range 200-500fs between 600nm (o-ray) and 300nm (e-ray)
Coating AR@600nm+300nm Orientation Tolerance +/-0.5°
Flatness λ/4@633nm Transmission Wavefront Distortion λ/4@633nm
Surface Quality 20/10 S/D Parallelism <30 arc sec

The group velocity is different for different wavelength, it is called group velocity mismatch (GVM), and then a time delay is introduced between fundamental and second harmonic generated (SHG) wavelength, in order to compensate this time delay, an time delay compensator with orthogonal polarizations are often used. Calcite crystals and alpha-BBO crystals are most popular materials to make the time delay compensators. By rotation of compensators, the time delay could be adjusted, the listed delay range are based on a rotation range of +/-12°.   

4 weeks