Novel Y₂O₃-codoped Yb/Tm-doped picosecond fiber laser

Abstract

We demonstrate the novel picosecond mode-locked Y 2 O 3 -codoped Yb/Tm-doped fiber lasers, operating at 1950 nm and producing pulses of up to 1 nJ energy, using a SESAM and an Er-doped pump fiber laser operating at the wavelength 1590 nm or a semiconductor pump laser operating at the wavelength of 1560 nm. We also report on the spectroscopic characterization of these new fibers with various compositions, identifying the optimum one for the maximum Yb/Tm energy transfer, the latter increasing with the increase of the Y concentration. The observed energy transfer between Yb and Tm makes this laser promising also for direct diode-pumping with most advanced and low cost 975 nm diodes, making this laser attractive for compact low cost picosecond Tm-doped fiber laser systems.

6.8 W all-fiber supercontinuum source at 1.9–2.5 μm

“…All-fiber core-pumped linear-cavity mode-locked seed lasers utilizing a silica-based Tm-doped fiber and a SESAM semiconductor mirror were realized, similar to [13]. A diode laser operating at the wavelength of 1560 nm was used as a pump source.…”

Emission decay and energy transfer in Yb/Tm Y-codoped fibers based on nano-modified glass

“…In our experiment we have studied the set of Yb/Tm-doped silicate fibers, namely: LCT-6, LCT-8 [6], and newly produced LCT-9, LCT-10, and HTY-1 fibers with different concentrations of dopants. The waveguide parameters of the fibers are presented in Table 1, the compositions as well as the calculation and measurement results are given in Table 2.…”

“…This efficiency is known to be dependent on the fiber composition. The spectroscopic investigation of Yb/Tmdoped fibers codoped with yttria was reported recently in [6]. It was assumed that yttria allows enhancing the Yb-Tm ET.…”