Fig. 10
Upconversion spectra of 11-core optical fiber under pumping with (a) 808 nm, (b) 940 nm, 980 nm laser and 4-core fiber under pumping with (c) 808 nm, (d) 940 and 980 nm laser.
Fig. 10 | Scientific Reports
Upconversion spectra of 11-core optical fiber under pumping with (a) 808 nm, (b) 940 nm, 980 nm laser and 4-core fiber under pumping with (c) 808 nm, (d) 940 and 980 nm laser.
