摘要:
In a general aspect, a chirped optical pulse is compressed by operation of diffraction gratings and a dispersive mirror having a smooth reflective surface. In some aspects, a chirped pulse laser system includes a programmable optical dispersive filter (PODF) operable to modify a spectral phase of optical pulses and a pulse compressor that receives an optical pulse based on an output of the PODF. The pulse compressor includes optical elements in a vacuum chamber. The optical elements define an optical path through the pulse compressor, and are arranged to disperse the optical pulse in the optical path. The optical elements include diffraction gratings and a dispersive mirror, which has a smooth reflective surface that defines a portion of the optical path.
摘要:
Various embodiments of a multi-laser system are disclosed. In some embodiments, the multi-laser system includes a plurality of lasers, a plurality of laser beams, a beam positioning system, a thermally stable enclosure, and a temperature controller. The thermally stable enclosure is substantially made of a material with high thermal conductivity such as at least 5 W/(m K). The thermally stable enclosure can help maintain alignment of the laser beams to a target object over a range of ambient temperatures.
摘要:
A laser device (100), configured for generating laser pulses, has a laser resonator (10) with a gain disk medium (11) and a Kerr medium (12). The laser resonator (10) includes a first mode shaping section (13) which is adapted for shaping a circulating electric field coupled into the gain disk medium (11), and a second mode shaping section (14), which is adapted for shaping the circulating electric field coupled into the Kerr medium (12) independently of the electric field shaping in the first mode shaping section (13). Furthermore, a method of generating laser pulses (1) using a laser resonator (10) with a gain disk medium (11) and a Kerr medium (12) is described.
摘要:
Apparatus and methods for self-cleaning of optical elements in sealed environments over a wide range of operating optical frequencies prevent long-term power degradation by introducing low-pressure backfill of a reactive gas such as oxygen into a vacuum chamber containing the optical elements. The backfill pressure is preferably between 10−4 torr and 10 torr, and generally between 0.1 torr and 2 torr at room temperature. The vacuum chamber may be continuously evacuated and backfilled, or may be sealed after evacuation and backfill is performed.
摘要:
One embodiment of a laser resonator comprises one or more laser resonator components, a container and an ozone generator. The laser resonator components include a non-linear crystal, a beam polarization combiner, an optical lens, a mirror and/or an optical grating. The container encloses the one or more laser resonator components. The ozone generator is configured to introduce ozone gas into the container.
摘要:
Various embodiments of a multi-laser system are disclosed. In some embodiments, the multi-laser system includes a plurality of lasers, a plurality of laser beams, a beam positioning system, a thermally stable enclosure, and a temperature controller. The thermally stable enclosure is substantially made of a material with high thermal conductivity such as at least 5 W/(m K). The thermally stable enclosure can help maintain alignment of the laser beams to a target object over a range of ambient temperatures.
摘要:
Various embodiments of a multi-laser system are disclosed. In some embodiments, the multi-laser system includes a plurality of lasers, a plurality of laser beams, a beam positioning system, beam focusing optics, a thermally stable enclosure and a temperature controller. The thermally stable enclosure is configured to thermally and mechanically couple to a flow cell. The thermally stable enclosure substantially comprises a material with high thermal conductivity. The thermally stable enclosure can have a relatively small volume.
摘要:
An ultra-short pulse laser system comprising an amplifying laser medium for producing a laser emission, a laser resonator having at least one resonator mirror and a pump source has a gas-filled section with a filling gas, the latter consisting of a single gas or a filling gas mixture differing from the composition of air, whose nonlinear refractive index n2 substantially corresponds to that of air and which has a rotational Raman effect which is smaller in comparison with air.
摘要:
There is provided a mode locked laser device including: a cavity, the cavity having a semiconductor saturable absorbing mirror and a negative dispersion mirror that controls group velocity dispersion within the cavity, disposed in a straight line; a solid-state laser medium, disposed in the cavity and outputting oscillating light due to excitation light being incident thereon; an excitation unit that causes the excitation light to be incident on the solid-state laser medium; and a cavity holder, the light incident face of the semiconductor saturable absorbing mirror attached to one end of the cavity holder, the negative dispersion mirror attached to the other end of the cavity holder, and the cavity holder integrally supporting the semiconductor saturable absorbing mirror and the negative dispersion mirror.
摘要:
Methods and constructions for cryogenically cooled solid state lasers are provided that allow the cooling channels to be embedded within the buffer heat sinks used to conductively cool the laser medium. Several gain medium geometries are disclosed that are compatible with efficient and straight forward cryogenic cooling techniques using practical pump chamber designs while eliminating the need for the pump light to traverse the cryogenic layers and allowing for smooth temperature cycling. A number of active material configurations that can be generally adapted for pumping by high power diodes, including slab, thin disk, active mirror, and rod geometries, are shown to be compatible with the cryogenic cooling approaches. Modeling results based on the preferred cooling configurations indicate substantial improvement in the performance of common solid state lasers, including Nd- and Yb-doped lasers. These improvements have been realized in a multiple thin-disk Yb:YAG folded resonator configuration.