The detection of OH in a laminar premixed air–methane flame by degenerate four-wave mixing (DFWM) is The detection reported. The four-wave mixing spectrum was recorded in the region of the R1, R2 band heads of the (0, 0) 2∑–2Π transition, showing clearly resolved rotational structure. Applications of the DFWM technique to combustion are discussed. As an example, the distribution of sodium atoms in a sodium-seeded flame has been diagnostics measured using a 90° geometry to enhance spatial resolution.
© 1986 Optical Society of America
Original Manuscript: December 23, 1985
Manuscript Accepted: February 26, 1986
Published: May 1, 1986
P. Ewart and S. V. O’Leary, "Detection of OH in a flame by degenerate four-wave mixing," Opt. Lett. 11, 279-281 (1986)