Supercontinuum Generation in Silica Fibers by Amplified Nanosecond Laser Diode Pulses

Comparative study of supercontinuum generation using standard and high-nonlinearity fibres pumped by noise-like pulses

“…Typically, SC is generated by ultrashort pulses interacting with a nonlinear medium [2,8,9], and can also be produced easily by long (ns) pulses [10][11][12][13], and even by continuouswave beams [14]. Nonetheless, in recent years the use of noise-like pulses (NLPs) as the seed to generate wider and flatter spectra has been promoted by several researchers, motivated by the need to improve SC sources in terms of efficiency and low cost.…”

“…In the case of ns pulses, spectral broadening is initially driven by MI that progressively converts the long pulse into a packet of ultrashort pulses; broadly speaking, the fragmentation stage of the long pulse is skipped when using NLPs, since from the beginning we already have a packet of ultrashort pulses with a large spectral width. Besides, although some works report the generation of a broad SC (even spanning from 1 µm to beyond 2 µm in short pieces of conventional fibre) using ns pulses and simple setups, its flatness is usually affected by the presence of a pronounced peak of residual pump, as can be seen in [11][12][13]. Furthermore, the required input peak power usually scales as a few kW [11][12][13] (in comparison, in the present work the NLP envelope does not reach 100 W).…”

“…Besides, although some works report the generation of a broad SC (even spanning from 1 µm to beyond 2 µm in short pieces of conventional fibre) using ns pulses and simple setups, its flatness is usually affected by the presence of a pronounced peak of residual pump, as can be seen in [11][12][13]. Furthermore, the required input peak power usually scales as a few kW [11][12][13] (in comparison, in the present work the NLP envelope does not reach 100 W). Some researchers have reported SC generation using NLPs produced in several fibre laser designs, demonstrating the benefits of this type of pump pulses as mentioned above.…”

Optimization of a supercontinuum source based on tapered ordinary fibers

“…The dynamics of supercontinuum generation (SCG) has been extensively investigated both theoretically and experimentally in the last two decades [4][5][6][7][8]. Extreme spectral broadening can be achieved using CW [9], ns [10], ps [11], or fs [12,13] laser sources coupled to highly nonlinear waveguides. Prevalent SCG waveguides are silica-based, generating spectra spanning from around 400 nm to 2000 nm [14].…”

Nanosecond Pulse Generation Using the Stimulated Brillouin Scattering Effect in a Photonic Crystal Fiber

“…A typical application of such a high power nanosecondpulsed laser is in generating a super-continuum (SC) light source. [4] Passive techniques are normally used to obtain such ultra-short light pulses, which are mainly based on a saturable absorber. [5,6] For instance, Xu et al [7] demonstrated a nanosecond-pulse Erbium-doped fiber laser (EDFL) using a graphene saturable absorber.…”