摘要:
The invention concerns a method for producing ultrashort and ultrahigh peak power laser pulses and a system for putting into practice this method. The production of ultrashort and ultrahigh peak power laser pulses is implemented by amplifying and compressing relatively long and low energy laser pulses to such ultra short and ultrahigh peak power pulses, and the use of the plasma compression technique for producing ultrashort and ultrahigh peak power pulses having a duration in the range of 20 femtoseconds (fs) or less and an energy of at least 10 Kilojoule (kJ), wherein a pump pulse (PP) in the order of picoseconds (ps) and a seed pulse (SS) are applied to the plasma cell (PLC), which are synchronized with one another and adapted to the plasma cell.
摘要:
An optical assembly includes a gas cell and an optical fibre portion in which the gas cell is integrated with the optical fibre portion. The gas cell comprises a waveguide made from hollow-core photonic crystal fibre (HC-PCF).
摘要:
An optical wave generator comprising a first-level Raman sideband generator (RSBG). The first-level RSBG comprises a first hollow-core photonic crystal fibre HCPCF (203) arranged to be filled with a Raman active gas and a first two-pump continuous wave (CW) laser source (200) having a first pump laser beam (201) at a first frequency and a second pump laser beam (202) at a second frequency, the laser source being arranged to excite the first HCPCF to generate a Raman sideband spectrum comprising a first plurality of spectral components.
摘要:
A laser system, such as a master oscillator/power amplifier system, comprises a gain medium and a stimulated Brillouin scattering SBS mirror system. The SBS mirror system includes an in situ filtered SBS medium that comprises a compound having a small negative non-linear index of refraction, such as a perfluoro compound. An SBS relay telescope having a telescope focal point includes a baffle at the telescope focal point which blocks off angle beams. A beam splitter is placed between the SBS mirror system and the SBS relay telescope, directing a fraction of the beam to an alternate beam path for an alignment fiducial. The SBS mirror system has a collimated SBS cell and a focused SBS cell. An adjustable attenuator is placed between the collimated SBS cell and the focused SBS cell, by which pulse width of the reflected beam can be adjusted.
摘要:
A laser system includes an optical path having an intracavity relay telescope with a telescope focal point for imaging an output of the gain medium between an image location at or near the gain medium and an image location at or near an output coupler for the laser system. A kinematic mount is provided within a vacuum chamber, and adapted to secure beam baffles near the telescope focal point. An access port on the vacuum chamber is adapted for allowing insertion and removal of the beam baffles. A first baffle formed using an alignment pinhole aperture is used during alignment of the laser system. A second tapered baffle replaces the alignment aperture during operation and acts as a far-field baffle in which off angle beams strike the baffle a grazing angle of incidence, reducing fluence levels at the impact areas.
摘要:
The present invention provides a Raman laser wherein hazardous radiation from a pump laser source 20 is focused by lens 25 via a cell 27 containing a Raman active medium before passing to a absorbing beam dump 30. Lasing action is maintained within the cell 27 by the action of mirrors 29 and 26 which are respectively totally and partially reflective to radiation generated at the Raman wavelength, and which are both transmissive to the pump beam. A Raman beam exits the cell via partially transmissive mirror 26 is refocused by lens 25 and passes through to the output of the device 31. This configuration provides a Raman laser where the "eyesafe" Raman beam is generated in a backwards direction relative to the pump beam, so that during normal operation, or in the event that the optics breakdown, or conversion does not take place within the cell, the output beam would not be contaminated by potentially harmful wavelengths at a hazardous level.
摘要:
Source laser de puissance accordable comportant une source laser 1 émettant un faisceau de pompe vers une cellule RAMAN 2. Elle transmet, à un cristal non-linéaire (3), un faisceau à une longueur d'onde de Stokes. Selon l'angle de ce faisceau par rapport à l'axe optique du cristal (3), le cristal non linéaire transmet deux ondes de sortie (Fs, Fi) à des longueurs d'ondes différentes de la longueur d'onde de Stokes. APPLICATION : LASER DE PUISSANCE ACCORDABLE EN FREQUENCE
摘要:
Un laser anti-Stokes Raman utilise un niveau métastable de brome. Un milieu de molécules contenant chacune au moins un atome de brome est utilisé (90). Des moyens (92) sont prévus pour dissocier l'atome de brome des molécules de sorte qu'une majorité d'atomes de brome dissociés prenne au moins un état métastable d'excitation. Des moyens (100) sont prévus pour illuminer les atomes de brome dans l'état métastable avec des photons de pompage de manière à produire des photons de sortie anti-Stokes Raman par transition de l'état métastable à un état final. Les photons de sortie ont une énergie égale à l'énergie des photons de pompage additionnée d'un gain d'énergie obtenu par la différence d'énergie entre l'état métastable et l'état final.