Control of emission diffraction angles and laser threshold in mixed-order sampled distributed feedback laser with organic gain media

H. Park, S. Alasvand Yazdani, F. Bencheikh, R. Komatsu, S. Yokoyama, T. Kamiya, C. Adachi

研究成果: ジャーナルへの寄稿学術誌査読

1 被引用数 (Scopus)

抄録

The control of laser emission angles in laser devices is essential for many optoelectronic and photonic applications such as optical sensing and displays. In this context, we studied the light diffraction pattern of laser beams in a one-dimensional sampled distributed feedback resonator having organic gain media. The gratings consist of the repetition of supercells having a mixed-order sampled grating in which 1st-order gratings surround a 2nd-order grating. The experimental results showed that the diffraction angles of the laser beams are quite diverse depending on the supercell structures. We demonstrate that the interval of the diffraction angle (θ) of the laser beams is inversely proportional to the length of the supercell experimentally and theoretically. By tuning the length of supercells as well as the length of 1st-order and 2nd-order regions, the interval θ was tuned from 0.1° to 43° with the different arc emission patterns. With the reduction of θ, i.e., the longer 1st-order region, a significant decrease in the laser threshold was obtained, resulting in the lowest lasing threshold of 2.5 ± 0.1 μJ/cm2 with ∼3.5 ns of a long pulse width excitation source.

本文言語英語
論文番号203101
ジャーナルJournal of Applied Physics
132
20
DOI
出版ステータス出版済み - 11月 28 2022

!!!All Science Journal Classification (ASJC) codes

  • 物理学および天文学一般

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