title: Yb fiber laser pumped mid-IR source based on difference frequency generation and its application to ammonia detection.
abstract: 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.
authors.affiliation: Department of Physics, School of Science,Tokai University, Kanagawa 259-162, Japan.
authors.forename: N
authors.initials: N
authors.lastname: Matsuoka
authors.forename: S
authors.initials: S
authors.lastname: Yamaguchi
authors.forename: K
authors.initials: K
authors.lastname: Nanri
authors.forename: T
authors.initials: T
authors.lastname: Fujioka
authors.forename: D
authors.initials: D
authors.lastname: Richter
authors.forename: F K
authors.initials: FK
authors.lastname: Tittel
mesh_terms: 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
chemical_list: D010087:Oxides; D009556:Niobium; C091692:lithium niobate; D000641:Ammonia; D015018:Ytterbium