Title

High power and spectral purity continuous-wave photonic THz source tunable from 1 to 4.5 THz for nonlinear molecular spectroscopy

Authors

Authors

J. Kiessling; I. Breunig; P. G. Schunemann; K. Buse;K. L. Vodopyanov

Comments

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Abbreviated Journal Title

New J. Phys.

Keywords

OPTICAL PARAMETRIC OSCILLATOR; TERAHERTZ SOURCE; GAAS; GENERATION; Physics, Multidisciplinary

Abstract

We report a diffraction-limited photonic terahertz (THz) source with linewidth < 10 MHz that can be used for nonlinear THz studies in the continuous wave (CW) regime with uninterrupted tunability in a broad range of THz frequencies. THz output is produced in orientation-patterned (OP) gallium arsenide (GaAs) via intracavity frequency mixing between the two closely spaced resonating signal and idler waves of an optical parametric oscillator (OPO) operating near lambda = 2 mu m. The doubly resonant type II OPO is based on a periodically poled lithium niobate (PPLN) pumped by a single-frequency Yb:YAG disc laser at 1030 nm. We take advantage of the enhancement of both optical fields inside a high-finesse OPO cavity: with 10 W of 1030 nm pump, 100 W of intracavity power near 2 mu m was attained with GaAs inside cavity. This allows dramatic improvement in terms of generated THz power, as compared to the state-of-the art CW methods. We achieved > 25 mu W of single-frequency tunable CW THz output power scalable to > 1 mW with proper choice of pump laser wavelength.

Journal Title

New Journal of Physics

Volume

15

Publication Date

1-1-2013

Document Type

Article

Language

English

First Page

11

WOS Identifier

WOS:000325801200001

ISSN

1367-2630

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