Efficient THZ Source Based on Cascaded Optical Down-Conversion in Orientation-Patterned GaAs Structures
Abstract
The goal of this DARPA TIFT project 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 an optical resonant cavity, and pumped by a compact solid state laser. The main achievements are: (1) quasi-phase-matched (QPM) GaAs microstructures with periodic reversal of crystalline orientation, including orientation-patterned GaAs (OPGaAs), diffusion-bonded GaAs (DB-GaAs) and optically-contacted GaAs (OC-GaAs) suitable for THz generation were fabricated with the length exceeding 2 cm and thickness of 1 mm, (2) efficient resonantly enhanced THz wave generation with GaAs inside the cavity of an optical parametric oscillator was achieved in the range 0.7-3.5 THz, with an average THz power of 1 mW at 2.8 THz, and (3) cascaded optical-to-THz frequency conversion was demonstrated, which opens the possibility of exceeding the Manley-Rowe conversion efficiency limit and getting more than one THz photon per optical photon.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 20, 2008
- Accession Number
- ADA500436
Entities
People
- Anjie Lin
- Candace Lynch
- David. Bliss
- James Harris
- Joe Schaar
- Konstantin L. Vodopyanov
- Martin M. Fejer
- Paulina Kuo
- Vladimir Kozlov
- Walter Hurlbut
- Xiaojun Yu
- Yun-shik Lee
Organizations
- Stanford University