Unequally spaced multiple mid-infrared wavelength generation using an engineered quasi-phase-matching device.
We propose a novel quasi-phase-matched (QPM) device that can generate unequally spaced multiple wavelengths. Unequally spaced multiple QPM peaks can be obtained by employing the optimized phase modulation of a periodic domain structure. We fabricated a LiNbO3 waveguide device for 3.2-3.4 microm band difference frequency generation based on the design. Using the multiple mid-infrared outputs, we demonstrate the detection of multiple hydrocarbon gases, namely, methane, ethylene, and ethane.
Asobe
Masaki
M
NTT Photonics Laboratories, NTT Corporation, Kanagawa, Japan. m-asobe@aecl.ntt.co.jp
Tadanaga
Osamu
O
Umeki
Takeshi
T
Yanagawa
Tsutomu
T
Nishida
Yoshiki
Y
Magari
Katsuaki
K
Suzuki
Hiroyuki
H