Elbit Systems Electro-optics Elop Ltd.

Tel Aviv University

Ofer Gayer

Zachary Sacks

Ady Arie

Ran Zvi Marom

Rina Cohen

Boaz Lissak

Gil Porat

Embodiments pertain to a system for controlling outputting of light towards objects, the system comprising a detection subsystem configured to detect, for at least one object, one or more values of object characteristics, the object characteristics comprising, at least, electromagnetic absorption characteristics, wherein detection of object characteristic values is performed such that the object remains structurally intact; a light source subsystem comprising at least one light source for generating output light and directing the output light towards an object; and a controller configured to control, based on the detected object characteristics values, at least one operational parameter value of the at least one light source such that at least some of the output light that is directed towards the object has electromagnetic characteristics that correspond to the detected values of the electromagnetic absorption characteristics of the object, in order to structurally change at least part of the respective object.

System and method for controlling output of light towards objects

Depolarized fiber lasers and respective methods are provided for increasing the SBS (stimulated Brillouin scattering) threshold. The laser source is constructed by a frequency-broadened seed source having a frequency bandwidth of less than 50 GHz, and the depolarization of the seed source is carried out at time scales shorter than 10 ns. At least one amplifier is configured to receive and amplify radiation from the frequency-broadened seed source and deliver the amplified radiation in the optical fiber. Depolarization may be achieved in various ways (e.g., using an interferometer with added length to one arm) and is kept at time scales shorter than tens of nanoseconds, typically shorter than 5-10 ns, which distinguish it from random polarization having polarization changes at longer time scales. Polarization maintaining fibers may be used to further increase the SBS by separating the polarizations states.

Narrowband depolarized fiber lasers

A system and method for improving conversion efficiency of a difference frequency generator (DFG) and/or for outputting a desired shape of the output signal, where the method includes providing a pump source, modifying the pump pulse temporal shape for optimal DFG conversion efficiency, and providing the modified pump pulse to the DFG. The pump source may be, for example, a MOPA laser or a diode or any other suitable source. In one embodiment, the pump pulse shape is modified such that an initial gain within the DFG is high, followed by a lower level signal for efficient conversion within the DFG. An example of such a shape is a double square pulse. Other configurations are possible as well such as a single rectangular pulse shape.

System and method for controlling optical output of a frequency conversion device

A cA crystal configured to change a frequency of a laser through an optical parametric oscillation (OPO) process and a difference frequency generation (DFG) process is provided. The crystal includes: an OPO-DFG segment that is quasi-periodically poled to yield (i) a conversion of a laser pump light applied thereto, to a first signal and an idler, and (ii) a conversion of a first signal applied thereto, to a second signal and to the idler, by phase-matching a difference frequency generation (DFG) process and an OPO process therein simultaneously, wherein the laser pump light has a frequency that equals a sum of a frequency of the first signal and a frequency of the idler and wherein the frequency of the first signal equals a sum of a frequency of the second signal and the frequency of the idler.

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Kfar Yedidya, Israel

Ofer Gayer