Estudio experimental sobre la evolución de los efectos no lineales que generan un espectro supercontinuo en fibras de cristal fotónico usando pulsos con duración de ns

Abstract

This paper presents the experimental study on the spectral evolution of a pump pulse spread into two different types of microstructures with solid core in photonic crystal fiber (PCF). We use as pumping source a laser Q-Switched Nd: YAG operating in the regime of nanosecond pulses (6 ns) with a central wavelength of 1064 nm, a repetition rate of 20 Hz and an energy of $\sim $ 180 mJ. Supercontinuum spectrum evolution is presented for a range of variation of input power between 0.05 mW to 1.86 mW at the input of the PCF. We analyze the pulse broadening explains the nonlinear phenomena involved in the process generation of new frequencies that appear in the input pulse. An important aspect is based on the development of an optical scheme which is capable of providing adequate control over the coupling of light at the input of the PCF and prevents the damage to the fibers used in this work. As it is known, the pulses generated by the laser Q-SWITCH Nd:YAG are very intense and can damage the PCF used, for this reason, the development of optical scheme was essential to obtain the spectra of supercontinuum generated in each of the PCF (spectra that have with a spectral width of $\sim $ 705 nm and $\sim $ 1100 nm). Finally, this paper describes the possible potential applications that can be implemented with the type of spectrum generated in each fiber.