Tungsten trioxide nanocomposite for conventional soliton and noise-like pulse generation in anomalous dispersion laser cavity

Abstract

This work demonstrates the employment of tungsten trioxide/polydimethylsiloxane nanocomposite saturable absorber (WO3/PDMS-SA) in realizing mode-locked conventional soliton (CS) and noise-like pulse (NLP) laser generation in net anomalous dispersion. The switching formation from CS regime of 970.0 fs pulse duration to NLP regime of 182.0 fs coherent spike with 65.3 ps pedestal was achieved by varying its pump power. The pulse laser exhibited good stability of 50.76 and 49.82 dB signal-to-noise ratio at 9.09 MHz fundamental repetition rate and trivial variation during stability test for CS and NLP regime, respectively. This work expresses the feasibility of WO3/PDMS-SA in attaining various types of mode-locked pulse phenomena using a fixed cavity configuration conceivably beneficial for compact dual-purpose laser systems.

Ultrafast laser state active controlling based on anisotropic quasi-1D material

“…The ultrafast lasers based on LDMs exhibits decent performance in pulse width and spectra 28 – 31 while the LS controlling is elusive. Even though LS controlling can be achieved by regulating pump power 32 – 34 or thickness of saturable absorber (SA) 35 , it typically suffers from low effectiveness and lack of dynamic mechanism.…”