High-Power Ultraflat Near-Infrared Supercontinuum Generation Pumped by a Continuous Amplified Spontaneous Emission Source

High-Power Ultraflat Near-Infrared Supercontinuum Generation Pumped by a Continuous Amplified Spontaneous Emission Source

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A high-power ultraflat near-infrared supercontinuum (SC) is generated in a section of photonic crystal fiber (PCF) pumped by an amplified spontaneous emission (ASE) source instead of continuous-wave (CW) and pulsed lasers.A low-power ASE seed at 1 μm is amplified to be 90.9 W by two fiber amplifiers and then emitted from a 10-μm-core fiber.

Using this ASE source to pump a section of 100-m-long PCF, a 49.5-W near-infrared SC is obtained, and the 5-dB spectral Baby bandwidth is 760 nm, covering from 1062 to 1822 nm.This is the reported highest power of ASE-pumped SC source.

A comparative experiment is taken with a 122-W CW laser at 1090 nm to pump the same PCF.A 56.2-W SC source is generated with 5-dB spectral width of 605 nm from 1082 to 1687 nm.

The conversion efficiency to SC is Generation 2 higher, and the spectrum is broader and flatter using the ASE source as the pump.Conclusively, pump incoherence can aid the SC generation and spectral flatness.