Raydiance Inc.

About: Raydiance Inc. is a based out in . It is known for research contribution in the topics: Laser & Ultrashort pulse. The organization has 57 authors who have published 71 publications receiving 1318 citations.

Automated polarization correction

Abstract: A chirped pulse amplification system includes one or more polarization compensator configured to compensate for polarization altering elements with the chirped pulse amplification system. The polarization compensator is responsive to a sensor configured to provide feedback to the polarization compensator. In some embodiments, the chirped pulse amplification system further includes a controller configured to automatically adjust the polarization compensator responsive to the sensor. The sensor is optionally a power sensor.

Design and fabrication of hollow-core photonic crystal fibers for high-power ultrashort pulse transportation and pulse compression

Abstract: We report on the recent design and fabrication of kagome-type hollow-core photonic crystal fibers for the purpose of high-power ultrashort pulse transportation The fabricated seven-cell three-ring hypocycloid-shaped large core fiber exhibits an up-to-date lowest attenuation (among all kagome fibers) of 40 dB/km over a broadband transmission centered at 1500 nm We show that the large core size, low attenuation, broadband transmission, single-mode guidance, and low dispersion make it an ideal host for high-power laser beam transportation By filling the fiber with helium gas, a 74 μJ, 850 fs, and 40 kHz repetition rate ultrashort pulse at 1550 nm has been faithfully delivered at the fiber output with little propagation pulse distortion Compression of a 105 μJ laser pulse from 850 fs down to 300 fs has been achieved by operating the fiber in ambient air

Highly ytterbium-doped silica fibers with low photo-darkening.

Abstract: Phosphorus co-doping is known to reduce clustering levels of rare earth ions in silica hosts. In this paper, ytterbium-doped silica fibers with ~8.9wt% Yb2O3, up to ~4700dB/m peak core absorption at 976nm, and low photo-darkening are demonstrated using high phosphorus co-doping. Measured gain as high as ~7dB/cm is demonstrated in the fiber.

Laser ablation method and apparatus having a feedback loop and control unit

Abstract: A laser ablation method and apparatus uses a laser device to generate a pulsed laser using a laser device and to project the pulsed laser onto an ablation target to be ablated. A probe is then used to measure an indicative property of the ablation target or of the pulsed laser projected on the ablation target. A control loop is used to optimize ablation effect by generating a feedback signal according to the measured indicative property, sending the feedback signal to a control unit, and adjusting an output parameter of the pulsed laser according to the feedback signal. The measured indicative property may be a size of the laser beam spot or a material composition. The ablation, the feedback and the adjustment may be performed dynamically.

Range resolved lidar for long distance ranging with sub-millimeter resolution

Abstract: A lidar technique employing temporally stretched, frequency chirped pulses from a 20 MHz mode locked laser is presented. Sub-millimeter resolution at a target range of 10.1 km (in fiber) is observed. A pulse tagging scheme based on phase modulation is demonstrated for range resolved measurements. A carrier to noise ratio of 30 dB is observed at an unambiguous target distance of 30 meters in fiber.