Arrangement for monitoring the emission wavelength of a laser source

An arrangement for monitoring the wavelength of a radiation beam emitted by a laser source (10), the arrangement including a wavelength selective photosensitive element (20, 22) adapted to be exposed to said radiation beam to generate an output signal (20a) indicative of the wavelength of said radiation, characterized in that:

• an optical system (12, 14, 16) is provided for launching said radiation beam into an optical waveguide (F), said optical system defining a beam propagation path for said radiation beam towards said optical waveguide (F), and
• said wavelength selective photosensitive element (20, 22) is arranged at a marginal position of said beam propagation path to collect a corresponding marginal portion of said radiation beam, whereby said output signal (20a) indicative of the wavelength of said radiation is generated from said corresponding marginal portion of said radiation beam in said optical system (12, 14, 16).