研究目的
To generate a broadband supercontinuum from a thulium ultrafast soliton fiber laser in a high numerical aperture silica fiber with low nJ seed pulse energies and to study the impact of pulse energy, pulse duration, and nonlinear fiber length on the supercontinuum generation.
研究成果
An all-silica-fiber thulium based oscillator and amplifier system is presented that enables the generation of a flat, broadband SC for low seed pulse energies in the few nJ regime while operating at a repetition rate of 21.1 MHz. This marks the first demonstration of a thulium based mode-locked laser with a supercontinuum generation that does not require multi-Watt pump systems and average powers of a few Watts to launch into the SC fiber.
研究不足
The reduced SC output power can be contributed to coupling losses into the smaller core fiber combined with non-negligible linear fiber losses in UHNA 7. The strength of nonlinear frequency generation is offset by higher encountered linear losses within the UHNA 7 fiber between the 20 m and 40 m fiber length.
