Abstract: A device for the generation of ultrashort pulses, wherein an oscillator is formed by: a first and a second non-overlapping transmission band-pass filter, which can serve as reflecting end element of the oscillator; optically transparent means with non-linear Kerr coefficient ?(3) different from zero configured to achieve a spectral broadening by self-phase modulation of the signal transiting through these means; an optical waveguide that produces a positive gain; a node configured to receive a trigger signal designed to activate the operation of the oscillator; a trigger signal generating device comprising: a laser source, for example a microchip, configured to generate a laser pulse, preferably with a minimum bandwidth, having a duration of hundreds of ps, up to the ns; a coupling system designed to introduce the pulse of the trigger laser into a waveguide made of an optically transparent material characterised by a non-linear Kerr coefficient ?(3) different from zero, which is configured to produce two dist

Abstract: A pumping method of discrete elements solid state laser systems pumped by semiconductor laser diodes, which sends a pump beam through an active medium, comprising a first face first crossed by said pump beam, and a second face met as second by the pump beam, a pumping axis being associated to the pump beam, the active medium being inserted in a cavity to which a cavity propagation axis is associated. The pumping axis coincides with the cavity propagation axis inside the active medium, and is perpendicular to an optical surface met by the pump beam after crossing the active medium, the optical surface being at least partially reflecting at the wavelength of the pump beam.

Abstract: The laser apparatus for generating high energy pulses of short duration comprises a pumping laser source and a miniaturized cavity defined by a pair of mirrors in which an active crystal and an absorber are housed. The active crystal presents a gain greater than 10 dB in double pass, said absorber being a saturable absorber. The process for generating a laser pulse consists of generating a beam of modes within a cavity and amplifying only one of the modes, so that the resultant signal presents a very limited duration but a very high intensity, with a spatial quality close to the diffraction limit.

Abstract: A diode pumped laser apparatus for generating a visible power beam, of the type comprising: a miniaturised linear laser cavity (72) with very low losses, comprising at least the following optical elements (30,33,36,10,20): reflecting means (30;33;36), highly reflecting at a fundamental wavelength, at least one of said reflecting means (33) being traversed by a pumping beam (55), at least one of said reflecting means (36) reflecting at the fundamental wavelength and at the second harmonic wavelength and at least one of said reflecting means (33) being highly transmissive at the second harmonic (51) warelength of said fundamental wavelength; an active material (10) with polarized emission and with a gain configuration with small thermal aberration for the cavity mode, said active material (10) being able to generate laser light (50) at a fundamental wavelength; a non linear crystal (20), inside said cavity (72).

Abstract: A method for selecting the polarization of the laser beam inside a laser cavity, which provides generation of a laser beam inside said resonant laser cavity, having optical media, which include one or more birefringent optical media. Said birefringent optical media are used for inducing a double refraction effect on the laser beam and separating the propagation directions of the different polarization components of the laser beam at the interface between said media and a second medium with a different refractive index, providing a plurality of separate resonance directions which are distinct for the different polarization components, and selectively align the cavity optical axis on one of said resonance positions through the adjustment of the position of one or more optical elements forming said cavity.

Abstract: A pumping method of discrete elements solid state laser systems pumped by semiconductor laser diodes, which sends a pump beam through an active medium, comprising a first face first crossed by said pump beam, and a second face met as second by the pump beam, a pumping axis being associated to the pump beam, the active medium being inserted in a cavity to which a cavity propagation axis is associated. The pumping axis coincides with the cavity propagation axis inside the active medium, and is perpendicular to an optical surface met by the pump beam after crossing the active medium, the optical surface being at least partially reflecting at the wavelength of the pump beam.