Fig. 4: SHG from few-millimetre ECFs with a high-density coating of MoS2 crystals.
From: In-fibre second-harmonic generation with embedded two-dimensional materials
a, SHG powers of 3.5-mm-long MoS2 ECF versus 12.0-mm-long MoS2 ECF were measured with a cut-back technique. The data are presented in a log–log scale. The two linear fits exhibit a slope of 1.90 and 1.93 for 3.5- and 12.0-mm-long ECF, respectively. b, SH spectra of the 3.5-mm-long MoS2 ECF over a wide range of excitation wavelengths. The fibre was excited by an OPO laser, which has a repetition rate of 80 MHz and pulse width of 180 fs. The output power was fixed at 10 mW for all the FW wavelengths.
