Abstract: Terahertz technology has attracted intense interest recently due to its potential applications, from THz spectroscopy and imaging to homeland security. THz sources and detectors are critical for THz applications. Optical parametric process is one of the most promising approaches for tunable monochromatic THz generation and detection for THz applications. In this presentation, Dr. Shi will introduce several innovative results in THz generation and detection. He is the first to observe the THz generation based on DFG using GaSe crystals, and other his other breakthroughs include backward THz generation in GaSe and THz frequency upconversion in GaSe, ZnGeP2 and GaP, respectively. Most recently, Dr. Shi demonstrated fiber-based THz sources for the first time. Several new results about high-power THz generation, based on high power pulsed fiber lasers and some engineered nonlinear crystals, such as QPM-GaP and QPM-GaAs crystals, will be presented. Presented on Thursday, Sept. 15, 2011. Dr. Wei Shi is the director of pulsed fiber laser and THz technology at NP Photonics Inc. He also serves as adjunct professor at College of Optical Sciences at the University of Arizona and supervises graduate students from UA. Dr. Shi received his Ph.D. from State Key Laboratory of Crystal Materials in China and worked in this lab as an associate professor for three years. Dr. Shi has served on the program committee for nonlinear optics for Photonics West since 2008 and the subcommittee for THz technologies and applications for CLEO since 2000. He has served as session chair for CLEO and Photonics West many times since 2008. He is also topic editor for OSA's Applied Optics journal. He has more than 20 years of experience in lasers, nonlinear optics and optical amplifiers research and development. He is a pioneer for the high-power single-frequency pulsed fiber lasers/amplifiers, especially for high SBS-threshold fiber laser/amplifier. Dr. Shi is one of the world leaders for parametric THz generation and detection, especially for fiber-based tunable monochromatic THz sources. He has carried out over $5 million SBIR/STTR projects and other government contracts. He has over 90 journal papers and over 50 conference presentations (including one plenary talk and seven invited talks) at Photonics West, CLEO, OSA and SPIE meetings. Dr. Shi owns two U.S. patents and has three patents filed pending.