Open AccessFemtosecond laser direct writing of single mode polymer micro ring laser with high stability and low pumping threshold
Author(s) -
Gholam-Mohammad Parsanasab,
Mojtaba Moshkani,
Alireza Gharavi
Publication year - 2015
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.23.008310
Subject(s) - lasing threshold , materials science , laser , optics , femtosecond , optoelectronics , amplified spontaneous emission , dye laser , polymer , gain switching , wavelength , physics , composite material
We have demonstrated an optically pumped polymer microring laser fabricated by two photon polymerization (TPP) of SU-8. The gain medium is an organic dye (Rhodamine B) doped in SU-8, and the laser cavity is a double coupled microring structure. Single mode lasing was obtained from the two coupled rings each with 30 µm and 29 µm radii using Vernier effect. Low laser threshold of 0.4 µJ/mm(2) is achieved using 1 µm wide polymer waveguides and the quality factor is greater than 10(4) at 612.4 nm wavelength. The lasing remained stable with pump energies from threshold to energies as high as 125 times the threshold.