We present experimental demonstration and modeling of the optimization of a phase-sensitive optical parametric amplifier by tuning the relative position between the pump and signal beam waists along the propagation direction. At the optimum position, the pump beam focuses after the signal beam, and this departure from colocated waists increases with increasing pump power. Such optimization leads to more than 3 dB improvement in the measured deamplification response of the amplifier.
© 2013 Optical Society of America
Original Manuscript: December 17, 2012
Revised Manuscript: February 22, 2013
Manuscript Accepted: March 8, 2013
Published: April 4, 2013
Gideon Alon, Oo-Kaw Lim, Amar Bhagwat, Chao-Hsiang Chen, Muthiah Annamalai, Michael Vasilyev, and Prem Kumar, "Optimization of gain in traveling-wave optical parametric amplifiers by tuning the offset between pump- and signal-waist locations," Opt. Lett. 38, 1268-1270 (2013)