Single-mode lasers using parity-time-symmetric polarization eigenstates
- URL: http://arxiv.org/abs/2105.06836v1
- Date: Fri, 14 May 2021 13:51:38 GMT
- Title: Single-mode lasers using parity-time-symmetric polarization eigenstates
- Authors: Jean-Fran\c{c}ois Bisson and Yves Christian Nonguierma
- Abstract summary: A laser resonator exhibiting non-Hermitian, parity-time (PT) symmetric, polarization states is studied.
A sharp symmetry-breaking transition is observed at a specific angle, called the exceptional point.
The two regimes meet at the exceptional point, where a unique polarization state exists in a resonator free from interference intensity pattern.
- Score: 0.0
- License: http://creativecommons.org/licenses/by-nc-sa/4.0/
- Abstract: Anisotropic mirrors are used to form a laser resonator exhibiting
non-Hermitian, parity-time (PT) symmetric, polarization states. The relative
angle of the two mirrors principal axes is used to control the degree of
non-hermiticity. A sharp symmetry-breaking transition is observed at a specific
angle, called the exceptional point, where the two states coalesce into a
single polarization state and the interference pattern produced by
counter-propagating (CP) waves vanishes. At a smaller angle, in the unbroken PT
symmetry regime, the polarization state experiencing higher losses is
suppressed. In the broken symmetry regime, the two polarization states coexist,
but the orthogonality of the CP waves favors single longitudinal mode emission
by suppressing the interference pattern of the standing wave. The two regimes
meet at the exceptional point, where a unique polarization state exists in a
resonator free from interference intensity pattern. Microchip PT-symmetric
lasers operating at the exceptional point are thus an attractive solution to
achieve single mode operation from a miniature monolithic device without any
intra-cavity element.
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