Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session D34: Optical Spectroscopic Measurements of 2D Materials III
3:00 PM–5:48 PM,
Monday, March 6, 2023
Room: Room 226/227
Sponsoring
Unit:
FIAP
Chair: Sudi Chen, UC Berkeley
Abstract: D34.00008 : Phase-matching-free intracavity second harmonic generation from a WSe2 monolayer in a passively mode-locked picosecond fiber laser*
4:24 PM–4:36 PM
Presenter:
Guangpeng Xu
(University at Buffalo, SUNY)
Authors:
Guangpeng Xu
(University at Buffalo, SUNY)
Jeffrey Carvalho
(University at Buffalo, SUNY)
Chiran Wijesundara
(University at Buffalo, SUNY)
Muhammed Kilinc
(University at Buffalo, SUNY)
Alec Cheney
(University at Buffalo, SUNY)
Christian Neureuter
(University at Buffalo, SUNY)
Steven Tarasek
(University at Buffalo, SUNY)
Tim Thomay
(University at Buffalo, SUNY)
A monolayer WSe2 flake is exfoliated and transferred onto the tip of a dome-shaped angle-polished passive fiber. Hyperspectral PL mapping on the fiber confirms the core is fully covered by the monolayer. In order to incorporate it directly into the laser cavity, it is sandwiched between a passive fiber and the Yb-doped gain fiber. The quadratic power dependence of the SHG signal is clearly indicative of second order nonlinear phenomena. In comparison, a linear relation in the absence of the monolayer indicates that the SHG response originates from the monolayer but not interfaces or non-centrosymmetric features in the laser cavity.
We report SHG generation inside a fiber laser cavity by transferring a WSe2 monolayer onto a fiber core while preserving stable mode-locking and output power. Such a fully integrated fiber laser system can provide second harmonics at relatively low peak powers (30-50 W). This opens up the pathway for fully fiber-integrated Carrier Envelope Offset (CEO) stabilization and self-referencing f-2f interferometry in frequency combs.
*Mark Diamond Research Fund
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