An extended optical pulse stretcher is provided that combines confocal pulse stretchers in combination to produce, for example, 4 reflections, 4 reflections, 12 reflections, and 12 reflections per optical circuit configuration. The inclusion of the combination of different mirror separations and delay path lengths can result in very long pulse stretching, long optical delays, and minimal efficiency losses. Also, in the extended optical pulse stretcher, at least a beam splitter can be positioned relative to the center of curvature of the mirrors to “flatten” each of the circuits to enable the beam to propagate in the same plane (e.g., parallel to the floor). Also, the curvatures and sizes of the individual mirrors can be designed to position the beam splitter closer to one of the banks of mirrors to allow the optical pulse stretchers to properly fit in an allocated location in a laser system.

The present invention provides a fiber laser system, comprising: a master laser cavity for generating a master laser beam; a beam splitter for splitting the master laser beam into a first beam for generating a first color pulsed laser beam and a second beam for generating a second color pulsed laser beam; and a synchronization component configured to synchronize the first color pulsed laser beam and a second color pulsed laser beam based on coherent wavelength generation.

An illumination system and a projection apparatus are provided. The illumination system includes a coherent light source, an optical module, and a first light-diffusing device. The coherent light source emits a coherent light beam. The optical module and the first light-diffusing device are located on a transmission path of the coherent light beam. The optical module has an optical surface and a light-diffusing surface, and the coherent light beam focuses on a first position through the optical surface of the optical module. The first light-diffusing device is located at the first position or in vicinity of the first position. The coherent light beam passes through the first light-diffusing device so that a diffusion angle of the coherent light beam is sequentially changed. A display frame exhibiting a uniform luminance is thereby provided by the illumination system and the projection apparatus of the invention.

Laser plasma optical device comprising a laser system for outputting driving light pulses and signal light pulses, a vacuum target chamber, a gas target generating device for generating gas and forming a required plasma channel target through high voltage capillary discharge ionization (or through laser picosecond pre-pulse ablation) of gas, and a focusing element. The driving light pulse is focused on the generated plasma channel target through the focusing element to generate a density-modulated plasma wake; and after a predetermined delay time T, the signal light pulse is focused onto a leading edge region of a second plasma density cavitation bubble of the plasma wake through the focusing element, so that the frequency of the signal light pulse is red-shifted to generate an ultra-intense near-single-cycle mid-infrared pulse.

Systems and methods are described that relate to a scanning laser system configured to emit laser light and an interlock circuit communicatively coupled to the scanning laser system. The interlock circuit may carry out certain operations. The operations include, as the scanning laser system emits laser light into one or more regions of an environment around the scanning laser system, determining a respective predicted dosage amount for each region based on the emitted laser light. The operations further include detecting an interlock condition. The interlock condition includes a predicted dosage amount for at least one region being greater than a threshold dose. In response to detecting the interlock condition, the operations include controlling the scanning laser system to reduce a subsequent dosage amount in the at least one region.

Methods and devices are described for performing an all-phase measurement of an ultra-fast laser pulse having a spectral range of greater than one octave. The ultra-fast laser pulse may be split into a first beam comprising a fundamental light with a wavelength λ.sub.0 and a second beam comprising a light with a wavelength 2λ.sub.0. The light with the wavelength 2λ.sub.0 may be frequency doubled to a light with a wavelength λ.sub.0 to generate an interference with the fundamental light. Fourier transform may be performed on an interference spectrum of the interference, and a relative envelope delay (RED) between the fundamental light and the frequency doubled light and a carrier envelope phase (CEP) may be acquired based on a result of the Fourier transform.

A method for amplifying an ultrashort laser pulse includes: a) stretching the ultrashort laser pulse in time, b) amplifying the time-stretched laser pulse, c) compressing the amplified time-stretched laser pulse, with at least one gain phase contribution selected from a group consisting of a gain dynamics phase contribution of the laser pulse that emerges as a change in a nonlinear phase on account of gain dynamics in step b), a gain bandwidth phase contribution of the laser pulse that emerges as a change in the nonlinear phase on account of a gain bandwidth in step b), and a combination thereof, being compensated by virtue of d) an additional phase contribution being imparted on the laser pulse prior to step c) and/or e) a spectrum of the laser pulse being changed, in such a way that the at least one gain phase contribution is compensated after step c).

A spiral phase plate, according to one embodiment, for generating a Laguerre Gaussian beam by reflecting an incident beam emitted from a light source, may comprise: a first quadrant area in which the step height increase rate per unit angle decreases progressively in one direction from the point with the lowest step height to the point with the highest step height; and a second quadrant area in which the step height increase rate per unit angle increases progressively in the one direction.

A laser device includes: a first reflecting unit; a second reflecting unit; a gain unit provided between the first reflecting unit and the second reflecting unit; a divider provided after the first reflecting unit and configured to divide laser light from the first reflecting unit into first light and second light; a first end portion positioned separately from the divider in a first direction, and positioned after the divider, the first end portion being configured to output, as output light, the first light or the first light that has been amplified; and a second end portion positioned separately from the divider in a second direction different from the first direction, the second end portion being configured to output the second light.

A system having a perception of its general environment is described. The general environment may include its surroundings, circuits, power supply, optics, emitters, software processing, and other things that may affect its perception system or sensors and biases associated with data processing. With this information, it may be able to adapt to the general environment with little human intervention. Dynamic updating and calibration of the environment or sensors in the environment may be provided. From one time frame to another, location or other information can be more efficiently rendered or decoded. Knowing the spacing of receivers may allow time delay calculations. Real world environmental changes may impact the relative location and or properties of these sensors. Observation or communication of these changes can be used to predict assembly and processing or projection of energies for a desired effect.