A photochromic compound directly modulates lasing from the gain medium, cutting thermal loss and signal noise from optical-electrical conversion.
A dual-pump fiber laser keeps pulse peak power and duration stable across wide repetition-frequency changes without extra optical modulators.
Acoustic waves in the gain medium balance self-phase modulation, making femtosecond pulse generation more homogeneous and stable.
Optical isolators and a two-stage fiber architecture raise 2 μm ASE output power while suppressing reflections that trigger self-lasing.