Efficient THz Source Based on Cascaded Optical Down-Conversion in Orientation-Patterned GaAs Structures
Final technical rept., 30 Sep 2004-31 Mar 2006
STANFORD UNIV CA EDWARD L GINZTON LAB OF PHYSICS
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The goal of this TIFT I-A program was to demonstrate an efficient room temperature source for THz imaging systems based on optical down-conversion in an orientation-patterned GaAs microstructure, incorporated into a resonant cavity, and pumped by a compact solid-state laser. Research was focused on 1 fabrication of quasi-phase-matched QPM GaAs microstructures with periodic reversal of crystalline orientation, including orientation-patterned GaAs OP-GaAs, diffusion-bonded GaAs DB-GaAs and optically-contacted GaAs OC-GaAs, 2 producing THz radiation in periodic GaAs structures outside the laser cavity using both optical rectification using femtosecond optical pump pulses and difference frequency generation with picosecond pulses, and, finally 3 demonstration of efficient resonantly enhanced THz wave generation with GaAs inside the cavity of an optical parametric oscillator, where 1 mW of average THz power was produced at 2.8 THz.
- Electrical and Electronic Equipment
- Lasers and Masers