摘要:
A system (2) for providing a sliced optical pulse is disclosed. The system (2) can comprise a master oscillator (4; MO) configured to generate an optical pulse (50) at a first spectral bandwidth. The system (2) can also comprise a semiconductor optical amplifier (6; SOA) configured to slice the optical pulse to generate a sliced optical pulse (150) that has a second spectral bandwidth. The second spectral bandwidth can be smaller than the first spectral bandwidth
摘要:
A system and method for reconfiguring a plurality of electromagnetic beams to take advantage of various wavelength beam combining techniques. The reconfiguring of beams includes individual rotation and selective repositioning of one or more beams with respect to beam's original input position.
摘要:
A system for producing a laser pulse includes a laser driver capable of direct modulation of a laser source comprising a plurality of lasers, and a wavelength beam combining cavity, comprising the directly modulated laser source, for producing a wavelength beam combining output of light from the plurality of lasers. The wavelength beam combining cavity may comprise a fast axis wavelength beam combining cavity. The laser source may comprise a multidimensional array of diode lasers disposed in a stack spatially interleaved or optically aligned. Each of the plurality of diode lasers may produce a distinct wavelength.
摘要:
The dielectric and/or semiconductor device influences the dispersion of electromagnetic radiation within a given spectral range. It comprises a substrate being essentially transparent to said electromagnetic radiation. The substrate has a first surface for incoupling said electromagnetic radiation into said substrate, and a second surface. The device further comprises a reflective multilayer structure on said second surface, said multilayer structure providing a controlled dispersion characteristic upon reflection of said electromagnetic radiation, e.g., a chirped mirror. The device is arranged in such a way that there is essentially no interference of electromagnetic radiation propagating in the direction of said multilayer structure and electromagnetic radiation reflected by said multilayer structure. An antireflection coating may be provided on the first surface of the substrate. With this device, oscillations in the group delay dispersion can almost completely be avoided.
摘要:
The disclosure relates in some aspects to a two-point locking system for stabilizing a frequency comb oscillator using at least two optical transitions of the same atomic/molecular sample. In an example, an optical reference sample is characterized by two or more optical transitions. A coherent light source provides polychromatic coherent light (such as an optical frequency comb). The beams of light, occupying the same spatial mode volume or separated in space, and having frequencies in the vicinity of the optical transitions of the reference sample, interrogate the resonances of the reference sample. Interrogation signals obtained using phase/frequency/amplitude spectroscopy or other spectroscopy techniques are then used to stabilize the frequency harmonics of the light. If the harmonics belong to the same coherent frequency comb, the entire comb becomes stabilized using this procedure. In an illustrative example, a stable atomic optical clock is provided using these techniques.
摘要:
There is presented a method of for generating a compressed optical pulse (112) comprising emitting from a wavelength tunable microcavity laser system (102), comprising an optical cavity (104) with a mechanically adjustable cavity length (L), a primary optical pulse (111) having a primary temporal width (Tl) while adjusting the optical cavity length (L) so that said primary optical pulse comprises temporally separated photons of different wavelengths, and transmitting said pulse through a dispersive medium (114), so as to generate a compressed optical pulse (112) with a secondary temporal width (T2), wherein the secondary temporal width (T2) is smaller than the primary temporal width (T1).
摘要:
The present invention relates to a semiconductor optical element for processing at least one optical pulse, comprising an optical path for propagating the optical pulse through the optical element from an input to an output, one or more pairs of optical processing units being situated in the optical path, wherein each pair of optical processing units comprises at least one saturable optical amplifier and at least one saturable optical absorption unit, the absorption element being arranged for entering into saturation when a pulse energy received by the absorption element is higher than a saturation energy of the absorption element, and the amplifier elements being arranged for entering into saturation when a pulse energy received by the amplifier element is higher than a saturation energy of the amplifier element, whilst it holds for each pair of processing units that the saturation energy of the absorption element is lower than the saturation energy of the amplifier element.
摘要:
A miniature ultra-short light pulse source is based on a passively mode-locked semiconductor laser, including a multisegment laser diode (LD) with controllable saturation in absorbing sections(s) and anti-reflection coating on one of its facets, which is used as an active element. A single-mode optical fiber with a Bragg grating (FBG) written into its core is used as an external cavity. Depending on FBG reflectivity spectrum, the device emits a regular train of transform-limited ps-length pulses or linearly chirped ps-length pulses suitable for a time-compression technique.
摘要:
A non-linear optical switch includes a semiconductor optical gain medium. The switch is arranged to switch a signal at a first wavelength in response to a control signal at a second wavelength applied to the optical gain medium. The refractive index of the gain medium is modified in response to the control signal. An optical holding signal at a third wavelength is applied to the gain medium. The optical holding signal pumps the optical gain medium and thereby fixes the Fermi level. The switch may be embodied in OTDM demultiplexers, clock recovery circuits, wavelength converters and other devices.
摘要:
The Raman scattering measurement apparatus includes a light generator configured to generate a first continuous light and a second continuous light whose wavelengths are mutually different, a pulse generator configured to generate a first optical pulse and a second optical pulse respectively from the first continuous light and the second continuous light, and a light detector configured to detect light whose intensity is modulated by Raman scattering generated by focusing the first and second optical pulses onto a sample. The pulse generator is configured to generate the first and second optical pulses such that a repetition frequency of the second optical pulse coincides with an integral multiple of a repetition frequency of the first optical pulse.