title: Mid-infrared difference-frequency generation source pumped by 1.1-1.5 micrometer dual-wavelength fiber amplifier for trace-gas detection.
abstract: Continuous-wave mid-infrared radiation near 3.5 micrometers is generated by difference-frequency mixing of the output of a compact 1.1-1.5 micrometer dual-wavelength fiber amplifier in periodically poled LiNbO3. The diode side-pumped amplifier is constructed with double-cladding Yb-doped fiber followed by single-mode Er/Yb codoped fiber. Output powers of as much as 11 microW at 3.4 micrometers are obtained, and spectroscopic detection of CH4 and H2CO is demonstrated.
authors.affiliation: Optical Sciences Division, Naval Research Laboratory, Washington, DC 20375-5672, USA. lew.goldberg@nrl.navy.mil
authors.forename: L
authors.initials: L
authors.lastname: Goldberg
authors.forename: J
authors.initials: J
authors.lastname: Koplow
authors.forename: D G
authors.initials: DG
authors.lastname: Lancaster
authors.forename: R F
authors.initials: RF
authors.lastname: Curl
authors.forename: F K
authors.initials: FK
authors.lastname: Tittel
mesh_terms: D004784:Environmental Monitoring / Q000379:methods*; D005336:Fiber Optic Technology; D005557:Formaldehyde / Q000032:analysis; D005740:Gases / Q000032:analysis*; D007834:Lasers; D008697:Methane / Q000032:analysis; D009556:Niobium; D016011:Normal Distribution; D010087:Oxides; D013055:Spectrophotometry, Infrared / Q000295:instrumentation; D015018:Ytterbium
chemical_list: D005740:Gases; D010087:Oxides; D009556:Niobium; C091692:lithium niobate; D005557:Formaldehyde; D015018:Ytterbium; D008697:Methane