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Opt Lett. 2011 Nov 15;36(22):4374-6. doi: 10.1364/OL.36.004374.

Pump-enhanced optical parametric oscillator generating continuous wave tunable terahertz radiation.

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1
Laboratory for Optical Systems, Department of Microsystems Engineering-IMTEK, University of Freiburg, Freiburg, Germany. jens.kiessling@imtek.de

Abstract

We demonstrate a tunable cw terahertz (THz) parametric oscillator based on periodically poled MgO-doped lithium niobate, directly converting the 1030 nm pump wave into the THz regime. The tunability ranges from 1.2 to 2.9 THz at output power levels between 0.3 and 3.9 μW. To overcome the high pump threshold caused by THz absorption in the nonlinear crystal, we employ an enhancement cavity with a finesse of 500 at the pump wavelength. The intracavity pump threshold at 1.4 THz is measured to be 350 W for a crystal length of 2.5 cm.

PMID:
22089568
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