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We demonstrate the key role of the laser injection into a multimode fiber toobtain a photonic jet (PJ). PJ, a high concentrated propagating beam with afull width at half maximum smaller than the diffraction limit, is heregenerated with a shaped optical fiber tip using a pulsed laser source (1064~nm,100~ns, 35~kHz). Three optical injection systems of light are compared. Forsimilar etched marks on silicon with diameters around 1~$\mu$m, we show thatthe required ablation energy is minimum when the injected light beam is closeto the fundamental mode diameter of the fiber. Thus, we confirm experimentallythat to obtain a PJ out of an optical fiber, light injection plays a role asimportant as that of the tip shape, and therefore the role of the fundamentalmode in the process.

Photonic jet: key role of injection for etchings with a shaped optical fiber tip