摘要:
The invention relates to a generation device (DG) that includes: a pulsed laser source (SL) generating primary photons having at least one wavelength within pulses having time dissymmetry, a shaping means (MM) controlling the primary photons so as to generate a selective-polarization, focused input beam (FE), and an optical fiber (FO) wherein the primary photons induce secondary photons having different wavelengths resulting from a Raman conversion cascade and forming a wide-spectrum output beam (FS) having substantially constant energy.
摘要:
There is provided a method for producing ultraintense laser pulses in which Stimulated Raman Back-Scattering (SRBS) amplifies and compresses a seed pulse (185), as well as an inventive compact plasma device which may implement the method. SRBS may be achieved by counter-propagating the seed pulse (185) and a pump pulse (190) through a few millimeter-long plasma (195) having a plasma frequency equal to the difference between the pump and the seed pulse frequencies. Dichroic mirrors (305,306) may be arranged to provide two amplifying and compression passes through the plasma, allowing greater seed pulse amplification by mitigating Landau damping within the plasma that would occur in a single pass of a plasma of double the length. Alternate examples provide for 2n number of amplification and compression passes by providing n short plasma columns, where n≥2, and additional, appropriately arranged dichroic mirrors. The compact size of the device, and the ultraintense, ultrashort pulses it emits, suit the device to dermatological applications.
摘要:
A pulsed laser system may include a Raman fiber that is configured to act as multiple wavelength Raman laser. The fiber is configured to receive a pulsed input beam from an input source and convert the input beam to an output beam having narrow band outputs at first and second frequencies v1 and v2.
摘要:
A pulsed laser system may include a Raman fiber that is configured to act as multiple wavelength Raman laser. The fiber is configured to receive a pulsed input beam from an input source and convert the input beam to an output beam having narrow band outputs at first and second frequencies v1 and v2.
摘要:
La présente invention concerne un dispositif laser Raman (1) comprenant : - un milieu amplificateur (2) absorbant à une longueur d'onde de pompe λ P et émettant à une longueur d'onde d'excitation λ S , - un milieu Raman (3) présentant au moins un décalage Stokes Δν R , de façon à convertir l'émission à la longueur d'onde d'excitation λ S en une émission continue à une longueur d'onde Raman λ R . Le milieu amplificateur (2) et le milieu Raman (3) appartiennent à une cavité Raman résonnante à la longueur d'onde d'excitation λ S et à la longueur d'onde Raman λ R . La longueur du milieu Raman (3) est inférieure à 9mm et la somme des espaces entre chacun des éléments du dispositif laser Raman (1) est inférieure à 2mm. L'invention concerne en outre un système comprenant un tel dispositif laser Raman (1), ainsi qu'un procédé de réglage du dispositif laser Raman (1).
摘要:
A continuous wave Raman laser for producing visible laser output comprising: a resonator cavity; at least a first reflector and a second reflector said first and second reflectors being located at opposite ends of the resonator cavity; a laser gain medium located in the resonator cavity for generating a continuous wave fundamental beam which resonates within the resonator cavity when pumped by a pump beam from a pump source external to the resonator cavity; a solid Raman-active medium positioned in the resonator cavity for Raman shifting the fundamental beam to produce a continuous wave Raman beam which resonates within the resonator cavity; and a non-linear medium positioned in the resonator cavity for frequency converting the continuous wave Raman beam to a converted wavelength to produce a continuous wave converted beam.
摘要:
A lasing medium (3) and a Raman medium (20) share a common optical cavity. The lasing medium (3) projects laser light into the Raman medium (20) and, when a threshold intensity within the Raman medium is reached, the Raman medium absorbs the laser light and re-radiates coherent light at a shifted frequency. Optical elements within the system provide an optical cavity for the lasing medium and a second cavity for the Raman medium.