UAIPD11-0028“Pattened GaN Quasi-Phase Matched (QPM)

Nonlinear Optical Crystal: Manufacturing Methods and its Application for High Power

THz Sources”Dr. Seongsin Margaret Kim

and Patrick Kung

• Current devices implementing THz frequencies–High loss due to high dispersion at pump

laser –Uses 2 μm pump lasers, which is very rare

and it has a high cost– Can use only low laser power– Very limited laser choices

Problems with Current Devices

• The THz frequency range used is effective for molecular spectrometry, but harmless to humans

• Structures used can extend the emission from mid-and far-infared to THz spectral range for effective radiation/detection of THz signals

Our Technology

• We use a pattened GaN quasi-phase matched nonlinear optical crystal

• More efficient due to strong mode confinement, high-facet reflectivity, and low-waveguide losses

• No need for special lasers: pump lasers in 0.7-1 μm exist already exist (lowers cost)

• Higher thermal conductivity than GaAs

Advantages

• Dr. Seongsin Margret Kim – Associate Professor– 21 publications– 1 patent

• Department seongsin@eng.ua.edu

– Electrical and Computer Engineering– Center for Materials for Information Technology

Inventor

• Dr. Patrick Kung – Associate Professor– Over 90 publications

• Department patkung@eng.ua.edu– Electrical and Computer Engineering– Center for Materials for Information

Technology

Inventor

Office for Technology Transfer720 2nd Ct E

Tuscaloosa, AL 35401UAIPD13-0014OTT@UA.edu

www.OTT.UA.edu