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


Personal Author(s) : Feng, Liang ; Wong, Zi J ; Ma, Ren-Min ; Wang, Yuan ; Zhang, Xiang


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a627697.pdf


Report Date : 21 Nov 2014


Pagination or Media Count : 5


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.


Descriptors :   *LASERS , *SYMMETRY , AMPLIFICATION , BAND SPECTRA , BANDWIDTH , CAVITY RESONATORS , CONTRAST , CONTROL , DOORS , ELECTROOPTICS , EMISSION CONTROL , GAIN , LASER CAVITIES , LIGHT , LOSSES , OPTICAL COMMUNICATIONS , REPRINTS , RESONANCE , RING LASERS


Subject Categories : Lasers and Masers


Distribution Statement : APPROVED FOR PUBLIC RELEASE