Accession Number:

ADA627697

Title:

Single-mode Laser by Parity-time Symmetry Breaking

Descriptive Note:

Journal article

Corporate Author:

CALIFORNIA UNIV BERKELEY NANOSCALE SCIENCE AND ENGINEERING CENTER

Report Date:

2014-11-21

Pagination or Media Count:

5.0

Abstract:

Effective manipulation of cavity resonant modes is crucial for emission control in laser physics and applications. Using the concept of parity-time symmetry to exploit the interplay between gain and loss i.e., light amplification and absorption, we demonstrate a parity-time symmetry-breaking laser with resonant modes that can be controlled at will. In contrast to conventional ring cavity lasers with multiple competing modes, our parity-time microring laser exhibits intrinsic single-mode lasing regardless of the gain spectral bandwidth. Thresholdless parity-time symmetry breaking due to the rotationally symmetric structure leads to stable single-mode operation with the selective whispering-gallery mode order. Exploration of parity-time symmetry in laser physics may open a door to next-generation optoelectronic devices for optical communications and computing.

Subject Categories:

  • Lasers and Masers

Distribution Statement:

APPROVED FOR PUBLIC RELEASE