500-nm broadband light generation in highly nonlinear dispersion shifted fiber by soliton laser

Abstract

A compact and robust broadband light source is desirable for frequency combs, and broadband infrared microscopy. To address these demanding problems, we report the generation of broadband spectroscopy using highly nonlinear dispersion-shifted fiber (HNL-DSF) in an all-fiber system without any free-space optics instruments. However, due to the damage to the glass material by a large number of photons at high power, the ability of the fiber to widen will weaken over time. Therefore, the seed pulse used in this paper is the traditional soliton mode-locked pulse, which has lower energy than other types of mode-locked pulse. After two-stage amplification, the peak power, pulse width, and pulse energy of the soliton pulse are about 2 kW, 10 ps, and 18.79 nJ respectively. Amplifying the power of a low-energy pulse to pump the dispersion-shifted fiber, the ultra-wideband spectrum of more than 500 nm can be obtained without damaging the fiber, which is an efficient method to generate a wide spectrum. This method can be potentially used in astronomy, industry, medicine, etc.