White-light continuum generation
The transformation of laser light into white light with substantial spectral bandwidth is called white-light continuum generation. In the white-light continuum generation, spectral broadening is achieved by the propagation of laser pulses in a highly nonlinear optical material, such as transparent solid materials, liquids and gasses. White-light continuum spectrum spans from visible to infrared region. In general, It is accepted theoretically and experimentally that the self-focusing is the primary process responsible for the phenomena of white-light continuum generation, in this process, the pulse is compressed in space and as a result, the peak intensity increases correspondingly. The other major processes responsible for starting the mechanism of self-broadening are a self-steepening and self-phase modulation. This interesting phenomenon of the white-light continuum is an ideal broadband light source for some interesting applications like seed pulse for optical parametric chirped pulse amplification (OPCPA), femtosecond time-resolved spectroscopy, short pulse generation, a tunable laser source, optical coherence tomography, material characterization, spectral interferometry, and pump-probe experiments.