Ipg Photonics Corporation

Anton Drozhzhin

Igor Samartsev

Alex Yusim

Victor Ilyashenko

Dmitry Pestov

Leonid Klebanov

Karina Barseguian

Anton Ryabtsev

Bruce Jenket

George Venus

Llyashenko Victor

The ultra-short pulse chirped pulse amplification (CPA) laser system and method of operating CPA laser system include outputting nearly transform limited (TL) pulses by a mode locked laser. The system and method further include temporarily stretching the TL pulses by a first Bragg grating providing thus each stretched pulse with a chirp which is further compensated for in a second Bragg grating operating as as a compressor. The laser system and method further include a pulse shaping unit measuring a spectral phase across the recompressed pulse and further adjusting the deviation of the measured spectral phase from that of the TL pulse by generating a corrective signal. The corrective signal is applied to the array of actuators coupled to respective segments of one of the BGs which are selectively actuated to induce the desired phase change, with the one BG thus operating as both stretcher/compressor and pulse shaper.

Chirped pulse amplification laser system

A clad mode stripper is provided on a passive double-clad fiber guiding amplified light signal downstream from a gain block. The fiber is configured with an upstream end stripped from a protective coating. A light absorbing mixture is applied to the exposed cladding of the fiber receiving unwanted pump light. The mixture includes a host material and a plurality of diffusers which are operative to scatter cladding light incident thereon and embedded in the host material so as to define upstream and downstream decoupling zones. The diffusers are selected from either silicone polymers with a refractive index lower than that of the host material or from metal particles and lower the effective refractive index of the mixture so that it at most equal to that of the cladding. The mixture is operative to gradually remove substantially entire unwanted light guided by the cladding so that the downstream decoupling zone is heated at a temperature lower than that of the upstream zone.

Clad mode stripper

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Avon, CT, United States of America

Anton Drozhzhin