We show that an intense coherent backward signal can be generated through a Raman-type four-wave-mixing process using forward propagating fields only. Phase matching for this process is achieved through a plasma modulation of the refractive index. Applications to standoff spectroscopy are discussed.
© 2012 Optical Society of America
Original Manuscript: November 9, 2011
Revised Manuscript: January 31, 2012
Manuscript Accepted: February 1, 2012
Published: March 2, 2012
Luqi Yuan, Konstantin E. Dorfman, Aleksei M. Zheltikov, and Marlan O. Scully, "Plasma-assisted coherent backscattering for standoff spectroscopy," Opt. Lett. 37, 987-989 (2012)