Cascaded optical parametric oscillations generating tunable terahertz waves in periodically poled lithium niobate crystals.
We present a continuous-wave (cw) singly-resonant optical parametric oscillator (SROPO) based on MgO-doped periodically poled lithium niobate (PPLN) delivering single-frequency idler output from 2.33 to 5.32 microm. In this system, we observe additional spectral components that have been attributed to stimulated Raman lines in other studies. However, we are able to assign them unambiguously to cascaded optical parametric processes. The tunable forward and backward idler waves generated by these additional phase-matched oscillations have frequencies that are tunable around 3.5 and 1.5 THz, respectively.
Kiessling
J
J
Institute of Physics, University of Bonn, Bonn, Germany. kiessling@physik.uni-bonn.de
Sowade
R
R
Breunig
I
I
Buse
K
K
Dierolf
V
V
D003460:Crystallization; D003461:Crystallography; D004867:Equipment Design; D008962:Models, Theoretical; D009556:Niobium / Q000737:chemistry*; D055100:Optical Fibers; D055095:Optics and Photonics; D009991:Oscillometry / Q000295:instrumentation; D010087:Oxides / Q000737:chemistry*; D012031:Refractometry; D013059:Spectrum Analysis, Raman
D010087:Oxides; D009556:Niobium; C091692:lithium niobate