Thermooptically Tunable Thulium/Holmium-Codoped Fiber Lasers Based on Multimode Interference Effects

Abstract

We present broadband tuning in Tm/Ho-codoped fiber lasers based on multimode interference effects. The oscillation wavelength is controlled over 100 nm by making use of large thermooptic coefficients of liquid cladding in a multimode section.

Tunable Q-switched Tm/Ho-codoped fiber laser based on a thermo-optically controlled multimode interference fiber structure

“…However, as the CLF length is made too short, the lower-order transmission peak moves into the gain region, causing the oscillation wavelength jump to the shorter wavelength side. In our previous experiments, we obtained laser oscillation at a wavelength of 2025 nm by adjusting the length of the CLF [30]. The relationship of the oscillation wavelength and the temperature is plotted as the filled circles in figure 9, showing a tunable wavelength range of 111 nm for the temperature change of 95.3 • C. The wavelength tuning coefficient was measured by −1.38 nm • C −1 around 25 • C. We calculated the tuning coefficient using the manufacturer data (dn D /dT = − 3.96 [25].…”