Yb fiber laser pumped mid-IR source based on difference frequency generation and its application to ammonia detection.
A Yb fiber laser pumped cw narrow-linewidth tunable mid-IR source based on a difference frequency generation (DFG) in a periodically poled LiNbO3 (PPLN) crystal for trace gas detection was demonstrated. A high power Yb fiber laser and a distributed feedback (DFB) laser diode were used as DFG pump sources. This source generated mid-IR at 3 microns with a powers of ~2.5 microW and a spectral linewidth of less than 30 MHz. A frequency tuning range of 300 GHz (10 cm-1) was obtained by varying the current and temperature of the DFB laser diode. A high-resolution NH3 absorption Doppler-broadened spectrum at 3295.4 cm-1 (3.0345 microns) was obtained at a cell pressure of 27 Pa from which a detection sensitivity of 24 ppm m was estimated.
Matsuoka
N
N
Department of Physics, School of Science,Tokai University, Kanagawa 259-162, Japan.
Yamaguchi
S
S
Nanri
K
K
Fujioka
T
T
Richter
D
D
Tittel
F K
FK
D000641:Ammonia / Q000032:analysis*; D004784:Environmental Monitoring / Q000379:methods*; D005336:Fiber Optic Technology; D007834:Lasers; D009556:Niobium; D016011:Normal Distribution; D010087:Oxides; D013055:Spectrophotometry, Infrared / Q000295:instrumentation; D015018:Ytterbium
D010087:Oxides; D009556:Niobium; C091692:lithium niobate; D000641:Ammonia; D015018:Ytterbium