Recent advances in VECSELs for laser projection applications
2011
Laser projectors integrated in portable devices offer a new platform for media display but put strong demands on the
laser sources in terms of efficiency, modulation band width, operating temperature range and device cost. Osram Opto
Semiconductors has developed and produces synthetic green lasers for projection applications on which the latest results
are reported. Based on vertical external cavity surface emitting laser (VECSEL) technology and second harmonic
generation an output power of >75mW has been achieved. The maximum output power is to a large extent limited by the
high thermal resistance of the monolithic VECSEL chip used. To overcome the thermal limitations a new thinfilm
VECSEL chip design is proposed where the epitaxial layers are transferred to a silicon carrier and processed on wafer
level, thus significantly lowering the thermal resistance and improving the maximum output power.
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