Colloquium: Jerome V. Moloney

    Thursday, April 4, 2013 - 3:30pm - 5:00pm
    Meinel 307

    Jerome V. Moloney will present "Optically Pumped Semiconductor Disk Lasers."


    Optically pumped semiconductor disk lasers [also known as Vertical External Cavity Surface Emitting Lasers (VECSELs)] provide versatile, wavelength-agile, high-brightness all-semiconductor CW and pulsed sources. In contrast to doped solid-state glasses, VECSELs deliver targeted wavelengths through quantum epitaxy growth design, and their very broad barrier absorption avoids the need for thermally stabilized diode bar pump sources. VECSELs deliver direct multi-Watt output in the infrared and mid-infrared while intracavity harmonic generation allows for multi-Watt level generation in the visible and ultraviolet. Intracavity difference frequency generation led to a record room-temperature mW power-tunable terahertz TECSEL source. Coherent Inc. of Santa Clara, Calif., is heavily invested in transitioning VECSEL technology into its product lines, and the European community has funded three major Sixth and Seventh Framework Programme projects on VECSEL technology.

    In this talk, I will review the basic physics that enables a rigorous first-principles design of the VECSELs' resonant periodic gain structure and overall optimization of the full cavity to produce record-level performance. This work was carried out under a U.S. Joint Technology Multidisciplinary Research Initiative project that ended this past year. Recently we demonstrated more than 100W CW from a single VECSEL chip, record ultra-short mode-locked performance and multi-Watt single frequency operation.