Cascaded Synchronous Terahertz Optical Parametric
Oscillations
in a Single MgO:PPLN Crystal¹

T. Liu*, L. Liu, X. B. Wang, X. Li, and J. Hou

College of Opto-Electronic Science and Engineering, National University of Defense Technology,
Changsha 410073, China

*e-mail: liutong719@163.com

Received October 28, 2011; in final form, November 4, 2011; published online March 6, 2012

Abstract—We present a synchronously pumped optical parametric oscillator (OPO) based on a single MgO-
doped periodically poled lithium niobate crystal (MgO:PPLN) delivering high-repetition-rate picosecond idler
output in the mid-infrared. At high power levels, cascaded optical parametric oscillations are observed, from
which the forward and backward idler waves are generated in the terahertz (THz) spectral region. We demon-
strate the cascaded processes involving THz-wave generation and make explanations for the high-order cas-
caded optical parametric processes. The cascaded terahertz optical parametric oscillations in a synchronously
pumped optical parametric oscillator are reported for the first time to the best of our knowledge.

DOI: 10.1134/S1054660X12040111

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