2026-04-17T11:40:24Zhttps://recercat.cat/oai/request

oai:recercat.cat:2117/1005562025-07-16T23:37:02Zcom_2072_1033col_2072_452950

Fiber-laser-based, high-repetition-rate, picosecond ultraviolet source tunable across 329-348 nm Devi, Kavita Kumar, Suddapalli Chaitanya Ebrahim-Zadeh, Majid Universitat Politècnica de Catalunya. Institut de Ciències Fotòniques Àrees temàtiques de la UPC::Física lasers lasers Làsers We report a compact, fiber-laser-based, high-repetition-rate picosecond source for the ultraviolet (UV), providing multi-tens of milliwatt of average power across 329-348 nm. The source is based on internal sum-frequency-generation (SFG) in a singly-resonant optical parametric oscillator (OPO), synchronously pumped at 532 nm by the second harmonic of a picosecond Yb-fiber laser at 80 MHz repetition rate. Using a 30-mm-long single-grating MgO:sPPLT crystal for the OPO and a 5-mm-long BiB3O6 crystal for intracavity SFG, we have generated up to 115 mW of average UV power at 339.9 nm, with >50 mW over 73% of the tuning range for 1.6 W of input pump power. The UV output exhibits passive rms power stability of ~2.9% rms over 1 min and 6.5% rms over 2 hours, in high beam quality. Angular acceptance bandwidth and cavity length detuning with pump power and crystal temperature have also been studied. Peer Reviewed Postprint (author's final draft) 2016-10-15 Article Devi, Kavita; Kumar, Suddapalli Chaitanya; Ebrahim-Zadeh, Majid. Fiber-laser-based, high-repetition-rate, picosecond ultraviolet source tunable across 329-348 nm. "Optics Letters", 15 Octubre 2016, vol. 41, núm. 20, p. 4799-4802. 0146-9592 https://hdl.handle.net/2117/100556 eng https://doi.org/10.1364/OL.41.004799 info:eu-repo/grantAgreement/MINECO//TEC2015-68234-R/ES/NOVELA ULTRARRAPIDA ULTRABROADBAND OPTICOS PARAMETRICOS OSCILADORES/ http://creativecommons.org/licenses/by-nc-nd/3.0/es/ Open Access Attribution-NonCommercial-NoDerivs 3.0 Spain 5 p. application/pdf OSA