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The usual method to achieve wavelength tunability from a laser source is generally by adjusting internal components in the laser resonator. This adds to system complexity, because of the strict alignment tolerance necessary to maintain optimal laser performance. We offer here a different approach, which consists in separating the laser source and the tuning system.
The laser source is a high energy and compact diode-pumped oscillator, which delivers high energy, fixed wavelength, femtosecond pulses. The output of the laser is coupled into a suitably designed holey fiber, in order to broaden the spectral emission. Spectral selection, for instance with interference filters, allows for easy tuning of the laser emission.
A femtosecond pulse launched into a standard optical fiber will experience spectral broadening. However, due to the fiber dispersion, the pulse will at the same time experience temporal broadening. The use of a special, zero dispersion photonics cristal fiber allows to maintain an ultrahort pulse duration at the output of the system.
According tho the user's needs, it is then possible to take advantage of the full spectrum, or to select a specific wavelength and spectral width within the tuning range of the system.
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