All-fiber supercontinuum source operating at 1 μm with combination of different PCFs

Abstract

We demonstrate an all-fiber scheme for generating supercontinuum spectrum based on a combination method. The configuration employed a nonlinear photonic crystal fiber for dispersion pre-management, an Yb-doped gain fiber for amplification and a special tapered photonic crystal fiber for supercontinuum generation. This setup allows for the generation of highly coherent supercontinuum with 30-dB bandwidth covering from 800 to 1240 nm as well as dispersive waves at 480 nm and 540 nm. The initial pulses were centered at 1030 nm with average power of 90 mW and repetition rate of 216 MHz. Based on the generated supercontinuum and dispersive waves at 540 nm, an envelope-carrier phase offset frequency with signal to noise ratio up to 37 dB was detected by a standard f-2f interferometer. The high signal to noise ratio shows that the infrared supercontinuum and the dispersive waves were highly coherent. Such a robust supercontinuum source achieved at low energy would promote the application of laser comb in precision measurement.

Synthesis and Direct Sampling of Single-Cycle Light Transients by Electron Tunneling in a Nanodevice

“…Three-Channel, ∼1.1 Octave Bandwidth, Optical Field Synthesizer. The white-light supercontinuum generated on the propagation of carrier-envelope-phase (CEP)stable ultrashort laser pulses (τ ∼ 7 fs, λ ∼ 680 to 1050 nm, energy ∼ 2.5 nJ, and repetition rate ∼ 80 MHz) through a photonic crystal fiber (PCF) 9,40,41 was partitioned into three different spectral channels, as per their different dispersion characteristics. The coherent white-light supercontinuum of ∼1 nJ energy spanning from 500 to 1400 nm was produced on propagation of the laser pulses through a commercially available PCF (FEMTOWHITE 800, NKT).…”