Ipg Photonics Corporation

Other

Alex Yusim

Igor Samartsev

Dmitry Starodubov

Hongbo Yu

Valentin Gapontsev

Vadim Smirnov

Roman Yagodkin

Anton Drozhzhin

Dmitry Pestov

Oleg Shkurihkin

Bruce Jenket

George Venus

Anton Ryabtsev

Alexey Avdokhin

Andreas Vaupel

Pankaj Kadwani

A laser system and method. In one example, the laser system includes an optical pulse stretcher configured to stretch pulse durations of an input train of input pulses to produce a train of stretched laser pulses, a pulse replicator module configured to increase a pulse repetition rate of the train of stretched laser pulses to produce a modified pulse train of laser light, a fiber power amplifier configured to amplify the modified pulse train to produce amplified laser pulses, and a pulse compressor that temporally compresses the amplified laser pulses to produce amplified and compressed laser pulses. The system may further include a nonlinear frequency conversion stage comprising at least one nonlinear crystal.

Ultrashort pulse laser source with chirped pulse amplification and tailored pulse train

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

The ultrafast pulse fiber laser system is configured with scalable output power and operative to reduce degradation of pulse integrity. The disclosed laser system is configured to suppress the pulse distortion through improvement of initial pulse contrast between main and side pulses and improved pulse shape using chirped pulse amplification and a fast intensity modulator driver by a corrected electrical signal that is generated from the original optical signal. The structure providing the improvement includes the photodiode, which is operative to measure the chirped optical pulse and convert it to the electrical signal, and analog electronics that quickly converts the electrical signal to the required signal that suppress the side pulses.

Ultrafast pulse laser system utilizing intensity pulse shape correction

A laser illuminated projector system is configured with multiple Red, Green and Blue laser sources. The Green laser source has an all fiber master oscillator power amplifier configuration in which pump light is coupled into the output end of the fiber amplifier in a counter-propagation direction rendering the structure of the Green source and therefore projector system compact. The Green laser source is operative to emit signal light pulses at about 1064 nm wavelength with a pulse repetition reaching of up to about 3000 kHz, pulse duration between about a 100 fm to about 100 psec, an average power between 1.5 W to above 30 W, a peak power above 5 MW, a pulse energy exceeding 100 &#x3bc;J and a beam quality parameter Mranging between 1.2 and 1.5. The thus configured Green laser source substantially reduces speckle otherwise visible on the laser illuminated screen.

High power ultra-short pulse laser-illuminated projector

A high power fiber laser system consisting of multiple fiber amplifier or laser systems amplifying the input signal in parallel is configured with a high power splitter such as to share some of the gain stages. The high power splitting component consists of high power fiber couplers and splitter(s). The splitter is a holographic optical element, a dielectric coated plate, a diffraction grating, or a volume Bragg grating. The resultant fiber laser configuration reduces the total number of amplifying stages including optical isolators and active fiber assemblies for the system and thus reduces the total volume and weight.

High power ultra-compact, lightweight multi-kilowatt fiber laser system based on coherent and spectral beam combining

A high power (HP) fiber circulator is configured with a case enclosing a plurality of optical components which are arranged so as to define multiple ports. The fiber circulator further includes a plurality of launching and receiving fiber components each of which has spliced delivery and pigtailed passive fibers selectively coupling a HP input signal into and receiving a HP output signal from respective input and output ports. The passive fibers of each fiber component have respective protective coatings spaced from one another and each covering the cladding of the fibers. A light stripper, extending between the protective coatings, is operative to substantially remove cladding-supported light from one of the passive fibers before it reaches the protective coating of the other passive fiber. At least one of the ports includes a wavelength selective component configured to direct the HP input light beam along the desired path between the ports and including a fiber Bragg grating, volume Bragg grating or a combination of these.

High power laser system with multiport circulator

High-power multi-port circulator

A waveguide receiving light which propagates through free space is configured with a coupler and delivery fiber. The coupler, including a GREEN or multimode fiber, has a protective coating and so does the delivery fiber. Upon splicing of the coupler to the delivery fiber, the protective coatings of the respective coupler and delivery fiber are spaced apart exposing thus end regions of the respective coupler and fiber. The exposed regions are covered by a light stripper made of material having a refractive index which is substantially the same as or greater than that one of outer claddings. Accordingly, the light stripper minimizes the amount of light capable of coupling into the protective coatings of the respective delivery and coupler fibers enhancing thus a power handling capabilities of the waveguide.

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Boston, MA, United States of America

Alex Yusim