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Proceedings Paper

Generation of tunable high-purity microwave and terahertz signals by two-frequency solid state lasers
Author(s): Marc Brunel; Ngoc Diep Lai; M. Vallet; Albert Le Floch; Fabien Bretenaker; Loic Morvan; Daniel Dolfi; Jean-Pierre Huignard; Stephane Blanc; Thomas Merlet
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Paper Abstract

We show that diode-pumped solid-state lasers can generate tunable high-purity microwave signals. In the case of a single-axis cavity containing an adjustable linear phase anisotropy, orthogonal linear eigenstates oscillate with a continuously tunable frequency difference. The maximum beat frequency is fixed by the laser cavity length and can reach a few tens of GHz. In order to reach the THz range, insertion of a double refraction crystal inside the laser cavity creates a two-axis laser that allows one to choose independently the frequencies of the two eigenstates. In this case the maximum beat frequency is fixed by the active medium gain bandwidth which is of a few THz for an Er:Yb:glass active medium. We show that doubling the two frequencies emitted by such a two-axis laser at 1.55 mum yields a source of tunable cw THz beat notes suitable for photomixing in GaAs-based THz emitters. Moreover, the beat notes generated by diode-pumped solid-state lasers can be phase-locked to microwave local oscillators. In particular, we show that a single-axis Er:Yb:glass laser provides a beat note continuously tunable from 0 to 20 GHz with a 170 muHz line width. The phase noise of such a source is measured to be lower than -130 dBc/Hz at 100 kHz offset from the carrier.

Paper Details

Date Published: 1 September 2004
PDF: 9 pages
Proc. SPIE 5466, Microwave and Terahertz Photonics, (1 September 2004); doi: 10.1117/12.554782
Show Author Affiliations
Marc Brunel, Physique des Atomes, Lasers, Molecules et Surfaces, CNRS and Univ. de Rennes I (France)
Physique des Atomes, Lasers, Molecules et Surfaces, CNRS (France)
Ngoc Diep Lai, Physique des Atomes, Lasers, Molecules et Surfaces, CNRS and Univ. de Rennes I (France)
M. Vallet, Physique des Atomes, Lasers, Molecules et Surfaces, CNRS and Univ. de Rennes I (France)
Albert Le Floch, Physique des Atomes, Lasers, Molecules et Surfaces, CNRS and Univ. de Rennes I (France)
Fabien Bretenaker, Physique des Atomes, Lasers, Molecules et Surfaces, CNRS and Univ. de Rennes I (France)
Loic Morvan, Thales Research and Technology (France)
Daniel Dolfi, Thales Research and Technology (France)
Jean-Pierre Huignard, Thales Research and Technology (France)
Stephane Blanc, Thales Air Defence (France)
Thomas Merlet, Thales Air Defence (France)


Published in SPIE Proceedings Vol. 5466:
Microwave and Terahertz Photonics
Andreas Stohr; Dieter Jager; Stavros Iezekiel, Editor(s)

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