title: Novel diode laser-based sensors for gas sensing applications.
abstract: The development of compact spectroscopic gas sensors and their applications to environmental sensing will be described. These sensors employ mid-infrared difference-frequency generation (DFG) in periodically poled lithium niobate (PPLN) crystals pumped by two single-frequency solid state lasers such as diode lasers, diode-pumped solid state, and fiber lasers. Ultrasensitive, highly selective, and real-time measurements of several important atmospheric trace gases, including carbon monoxide, nitrous oxide, carbon dioxide, formaldehyde [correction of formaldehye], and methane, have been demonstrated.
authors.affiliation: Rice Quantum Institute, Rice University, Houston, TX 77005, USA. fkt@rice.edu
authors.forename: F K
authors.initials: FK
authors.lastname: Tittel
authors.forename: D G
authors.initials: DG
authors.lastname: Lancaster
authors.forename: D
authors.initials: D
authors.lastname: Richter
mesh_terms: D002245:Carbon Dioxide / Q000032:analysis; D002248:Carbon Monoxide / Q000032:analysis; D004784:Environmental Monitoring / Q000295:instrumentation* / Q000379:methods; D004867:Equipment Design; D005069:Evaluation Studies as Topic; D005336:Fiber Optic Technology; D005557:Formaldehyde / Q000032:analysis; D005740:Gases / Q000032:analysis*; D007834:Lasers; D008697:Methane / Q000032:analysis; D009556:Niobium; D009609:Nitrous Oxide / Q000032:analysis; D010087:Oxides; D013055:Spectrophotometry, Infrared / Q000295:instrumentation
chemical_list: D005740:Gases; D010087:Oxides; D009556:Niobium; C091692:lithium niobate; D002245:Carbon Dioxide; D005557:Formaldehyde; D002248:Carbon Monoxide; D009609:Nitrous Oxide; D008697:Methane
keywords: NASA Discipline Life Sciences Technologies; Non-NASA Center