Henderson-Sapir, O.Bawden, N.Theodosiou, A.Majewski, M.R.Kalli, K.Jackson, S.D.Ottaway, D.J.2022-11-222022-11-222023Journal of Lightwave Technology, 2023; 41(2):716-7250733-87241558-2213https://hdl.handle.net/2440/136942Date of publication: 07 November 2022A mode-locked, dual-wavelength pumped 3.5μm fiber laser using frequency shifted feedback utilizing an acoustooptic modulator is reported. Pulses of 3.8 ps with 9.7 nJ were obtained at a repetition rate of 37.75 MHz. The resulting peak power is 2.55kW. An electronically wavelength swept, mid-IR interrogator is built to characterize a mid-IR fiber Bragg grating.en© 2022 IEEE.Acoustooptic modulation; dual-wavelength pumping; erbium; FBG interrogator; frequency shifted feedback; lasers; mid-infrared; mode locked lasers; optical fiber lasers; ZBLANJournal article10.1109/jlt.2022.32198212022-11-14627030Henderson-Sapir, O. [0000-0002-1613-9985]Ottaway, D.J. [0000-0001-6794-1591]