Real-Time N2O Gas Detection System for Agricultural Production Using a 4.6-µm-Band Laser Source Based on a Periodically Poled LiNbO3 Ridge Waveguide. - Akio Tokura; Masaki Asobe; Koji Enbutsu; Toshihiro Yoshihara; Shin-nosuke Hashida; Hirokazu Takenouchi (Sensors, 2013)