Linewidth-narrowing of a continuous wave terahertz polariton laser using an intracavity etalon

Yameng Zheng; Andrew Lee; David Spence; Helen Pask

doi:10.1364/OL.45.000157

Optics Letters
Vol. 45,
Issue 1,
pp. 157-160
(2020)
•https://doi.org/10.1364/OL.45.000157

Linewidth-narrowing of a continuous wave terahertz polariton laser using an intracavity etalon

Yameng Zheng, Andrew Lee, David Spence, and Helen Pask

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Yameng Zheng, Andrew Lee, David Spence, and Helen Pask, "Linewidth-narrowing of a continuous wave terahertz polariton laser using an intracavity etalon," Opt. Lett. 45, 157-160 (2020)

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Table of Contents Category
- Lasers and Laser Optics
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About this Article
History
- Original Manuscript: September 12, 2019
- Revised Manuscript: November 6, 2019
- Manuscript Accepted: November 17, 2019
- Published: December 23, 2019

Abstract

An uncoated etalon was incorporated within an intracavity continuous wave terahertz polariton laser, leading to a tenfold reduction in linewidth, plus a factor of 2 increase in the THz output power. The increase in output power is explained in terms of phase matching considerations for the parametric downconversion process.

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Laser Performance	Free-Running	With Etalon
Maximum THz power	6.8 µW	13.7 µW
Fundamental linewidth	$0.354 \pm 0.008 n m$	$0.028 \pm 0.008 n m$
(FWHM)	( $94 \pm 2 G H z$ )	( $7 \pm 2 G H z$ )
Stokes linewidth	$0.087 \pm 0.008 n m$	$0.009 \pm 0.008 n m$
(FWHM)	( $23 \pm 2 G H z$ )	( $2 \pm 2 G H z$ )
Predicted THz linewidth	$9.7 \pm 0.3 µ m$	$0.7 \pm 0.3 µ m$
(FWHM)	( $117 \pm 4 G H z$ )	( $10 \pm 4 G H z$ )

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Optics Letters