ott.ua.edu

1. 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

2. • 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

3. • 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

4. • 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

5. • 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

6. • Dr. Patrick Kung
– Associate Professor
– Over 90 publications
• Department patkung@eng.ua.edu
– Electrical and Computer Engineering
– Center for Materials for Information Technology
Inventor

7. Office for Technology Transfer
720 2nd Ct E
Tuscaloosa, AL 35401
UAIPD13-0014
OTT@UA.edu
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