LayTec has customized and expanded EpiTT's performance for VCSEL epitaxy: The new EpiTT VCSEL combines spectral reflectance measurements with the robust and industry proven EpiTT performance. EpiTT VCSEL contains two fiber optical heads: one for a standard EpiTT and one for spectral reflectance sensing. ...more


LayTec‘s EpiTT FaceT for GaAs laser facet coating is an in-situ spectroscopic metrology tool especially designed for accurate temperature measurement during MBE passivation of GaAs laser facets in conjunction with real-time sensing of the passivation layer thickness.
The laser stack temperature can be determined both during cleaning and passivation in a range from room temperature up to 400 °C.
EpiTT FaceT facilitates the real-time determination of the passivation layer thickness in a typical range from 0 - 30 nm.