Du Chenlin

Supercontinuum Generation in a Photonic Crystal Fibre

Nearly 1000-nm broad continuum from 390 nm to 1370 nm is generated in a 2-m long photonic crystal fibre. The maximum total power of supercontinuum is measured to be 60 mW with the pumping power of 800 mW output from a 200-fs Ti:sapphire laser. The evolution of the pumping light into supercontinuum is experimentally studied in detail. It is found that the mechanism for supercontinuum generation has direct relations with Raman effect and soliton effect, and the four-wave mixing plays an important role in the last phase of the supercontinuum generation.

Supercontinuum Generation Using a Polarization-Maintaining Photonic Crystal Fibre by a Regeneratively Amplified Ti:Sapphire Laser

Supercontinuum with an ultra-broad bandwidth in the range from 380 nm to 1750 nm was generated by injecting 250 kHz 200 fs optical pulses produced by a regeneratively amplified Ti:sapphire laser into a 2.5-m-long polarization-maintaining photonic crystal fibre (PCF). It is indicated that the mechanism for the supercontinuum generation in the anomalous dispersion region of the PCF are directly related to the Raman effect, the fission of higher-order solitons, nonsolitonic radiation, and the coinstantaneous effect of four-wave mixing. The frequency components beyond 1.4 μm were also observed. It is interpreted that the energy of solitons is shifted beyond the OH absorption with a higher input power.

High Power Continuous-Wave Diode-End-Pumped 1.34-μm Nd:GdVO4 Laser

A high power cw all-solid-state 1.34-μm Nd:GdVO4 laser is experimentally demonstrated. With a diode-double-end-pumped configuration and a simple plane-parallel cavity, a maximum output power of 27.9W is obtained at incident pump power of 96 W, introducing a slope efficiency of 35.4%. To the best of our knowledge, this is the highest output power of diode-end-pumped 1.3-μm laser. With the experimental data, the thermal-stress-resistance figure of merit of Nd:GdVO4 crystal with 0.3 at% Nd3+ doped level is calculated to be larger than 9.94 W/cm.

Spectral Broadening in a Polarization-Maintaining Photonic Crystal Fibre by Femtosecond Pulses from an Optical Parametric Amplifier

The spectral broadening with the bandwidth of 83 nm (1.2486–1.3318 μm) in the 1.3 μm region is achieved in a 0.2-m-long, polarization-maintaining photonic crystal fibre (PCF) with an average core radius of 1.8 μm, pumped by optical pulses at the wavelength 1.269 μm, with the duration 250 fs and the repetition rate 250 kHz from an optical parametric amplifier. The polarization characteristics of the output spectra are also investigated.