Source laser accordable fondée sur la génération de supercontinuum dans une fibre microstructurée

We investigate the possibility to recycle the supercontinuum (SC) generated by a photonic crystal fiber (PCF) to increase the efficiency of actual SC based laser sources.We demonstrate that by recycling the SC, one can convert power from the broad spectrum to the selected wavelength, increasing the laser source efficiency. The pump laser is injected into the loop by a volume Bragg grating (VBG) and then coupled to the PCF fiber. This solid core fiber broadens the pump spectrum into a SC, from which a wavelength is selected and extracted out of the loop by a second VBG. The remaining light is transmitted and recoupled to the fiber. The remaining SC spectrum, in which there is now a "hole", is then attened by the same mechanism that created it, giving rise to a net increase in optical output power at the desired wavelength. The gain of such a mechanism is actually shown to reach 23% at certain wavelength when a 1064 nm pump is broaden by a PCF with a zero dispersion wavelength between 1 and 1.06 m.