Abstract:
A system for optical amplification includes an optical fiber with a core containing a gain medium surrounded by a cladding, a seed light source, a control light source, and a pump source. The seed light source transmits seed light, at a first wavelength and having a first linewidth greater than 100 MHz, into the core of the fiber. The control light source transmits control light, at a second wavelength shorter than the first wavelength, into the core where it interacts with the pumped gain medium so as to reduce the peak rate of heat deposition per unit length along the fiber. The control light has a second linewidth greater than 100 MHz. The pump source transmits pump light at a pump wavelength, shorter than the second wavelength, into the fiber so as to pump the gain medium and amplify the seed light.
Abstract:
A tunable laser that includes an array of parallel optical amplifiers is described. The laser may also include an intracavity NxM coupler that couples power between a cavity mirror and the array of parallel optical amplifiers. Phase adjusters in optical paths between the NxM coupler and the optical amplifiers can be used to adjust an amount of power output from M- 1 ports of the NxM coupler. A tunable wavelength filter is incorporated in the laser cavity to select a lasing wavelength.
Abstract:
The present invention is notably directed to a photonic circuit device (100) for optical gain measurement, comprising: a substrate (10) with a photonic circuit, the latter comprising one or more waveguides (71, 72) defining two waveguide portions aligned along a same direction; an active gain section (62 – 66), on top of the substrate and coupled in the device for generating light by electrical pumping or optical pumping; at least two light couplers (75, 76) arranged such that at least a part of the active gain section is between the light couplers, and configured for coupling light between the active gain section and said waveguide portions; and a partial reflector (90) arranged so as to reflect light propagating along said same direction back to a center of the gain section, and wherein the device does not comprise any other reflector opposite to said partial reflector with respect to the active gain section and configured to reflect light back to the center of the gain section. The present invention is further directed to related gain measurement methods.
Abstract:
A laser control system, control circuit, and method. A master oscillator laser generates a seed laser pulse train. An optical modulator receives the pulse train and modulate the pulse train based on a modulation signal to generate modulated seed pulses. A laser amplifier amplifies the modulated seed pulses to generate an amplified pulse sequence output. A control circuit controls the operation of the optical modulator. The control circuit receives a clock signal synchronized with the seed laser pulse train and a trigger input for asynchronous modulation of the seed laser pulse train, generates the modulation signal, and communicates the modulation signal to the optical modulator. The modulation signal controls the optical modulator to selectively transmit and attenuate seed pulses from the seed laser pulse train to produce modulated seed pulses corresponding to the trigger input and attenuated to maintain a predetermined amplitude envelope in the pulse sequence output.
Abstract:
Es wird ein Kurzpuls-Laser (1) mit einem Seed-Laseroszillator (2), mit einem steuerbaren Pulspicker (4) zum Auskoppeln eines Laserpulses oder einer Sequenz von Laserpulsen und mit einer dem Pulspicker (4) nachgeschalteten Verstärkereinheit (5, 6) zum Verstärken der ausgekoppelten Laserpulse angegeben, wobei die Verstärkereinheit (5, 6) wenigstens eine erste Verstärkerstufe (5) und einen steuerbaren ersten Pumplaser (8) umfasst. Dabei ist weiter eine Steuereinheit (10) umfasst, die eingerichtet ist, den Pulspicker (4) und/oder den ersten Pumplaser (8) zum Erreichen einer vorgegebenen Energie der nachverstärkten Laserpulse zu steuern.
Abstract:
A laser adjustment system can include an adjustable seed-beam restrictor (230), configured to be attachable to a stretcher-compressor (200) in a transverse-adjustable manner, and to restrict an incidence of a seed beam (101), generated by an oscillator (100), on the stretcher-compressor (200), wherein the stretcher-compressor (200) is configured to be integrated into a chirped pulse amplification laser engine (1), and to stretch a duration of seed pulses (lOlp) of the seed beam (101).
Abstract:
Techniques are disclosed for monitoring parameters in a high power fiber laser or amplifier system without adding a tap coupler or increasing fiber length. In some embodiments, a cladding stripper is used to draw off a small percentage of light propagating in the cladding to an integrated signal parameter monitor. Parameters at one or more specific wavelengths (e.g., pump signal wavelength, signal/core signal wavelength, etc) can be monitored. In some such cases, filters can be used to allow for selective passing of signal wavelength to be monitored to a corresponding parameter monitor. The filters can be external or may be integrated into a parameter monitor package that includes cladding stripper with integrated parameter monitor. Other parameters of interest (e.g., phase, wavelength) can also be monitored, in addition to, or as an alternative to power. Numerous configurations and variations will be apparent in light of this disclosure (e.g., system-on-chip).