Two-dimensional combination of eight ultrashort pulsed beams using a diffractive optic pair.

We demonstrate, to the best of our knowledge, the first two-dimensional diffractive beam combination for ultrashort pulses-a highly scalable technique capable of using a diffractive optic pair to combine large arrays of ultrashort pulsed beams. A square array of eight 120 fs pulsed beams from eight fiber outputs is coherently combined into one beam using the diffractive combiner. The experimental results show that the combined pulse preserves the input pulse width and shape, and the combining efficiency is measured to be close to the limit of the manufactured diffractive optic. An analysis shows that the combining loss due to uncompensated temporal and spatial dispersions is negligible.

[1]  J R Leger,et al.  Coherent laser addition using binary phase gratings. , 1987, Applied optics.

[2]  Zach DeVito,et al.  Opt , 2017 .

[3]  Hans Peter Herzig,et al.  High-efficiency continuous surface-relief gratings for two-dimensional array generation. , 1992 .

[4]  Tong Zhou,et al.  Coherent combination of ultrashort pulse beams using two diffractive optics. , 2017, Optics letters.

[5]  Eric Esarey,et al.  Physics of laser-driven plasma-based electron accelerators , 2009 .

[6]  Joshua E. Rothenberg,et al.  Scalable Coherent Combining of Kilowatt Fiber Amplifiers Into a 2.4-kW Beam , 2014, IEEE Journal of Selected Topics in Quantum Electronics.

[7]  E. Treacy.  Optical pulse compression with diffraction gratings , 1969 .

[8]  János Hebling,et al.  Derivation of the pulse front tilt caused by angular dispersion , 1996 .

[9]  Cesar Jauregui,et al.  Fiber chirped-pulse amplification system emitting 3.8 GW peak power. , 2011, Optics express.

[10]  Pu Zhou,et al.  Coherent Beam Combining of Fiber Amplifiers Using Stochastic Parallel Gradient Descent Algorithm and Its Application , 2009, IEEE Journal of Selected Topics in Quantum Electronics.

[11]  Tino Eidam,et al.  22  GW peak-power fiber chirped-pulse-amplification system. , 2014, Optics letters.

[12]  Tso Yee Fan,et al.  Diffractive coherent combining of a 2.5 kW fiber laser array into a 1.9 kW Gaussian beam. , 2012, Optics letters.

[13]  P Bourdon,et al.  Passive coherent beam combining of two femtosecond fiber chirped-pulse amplifiers , 2011, Other Conferences.

[14]  Joshua E. Rothenberg,et al.  Perturbative analysis of coherent combining efficiency with mismatched lasers. , 2010, Optics express.

[15]  Craig Robin,et al.  Two-dimensional diffractive coherent combining of 15 fiber amplifiers into a 600 W beam. , 2012, Optics letters.

[16]  Almantas Galvanauskas,et al.  Coherent femtosecond pulse combining of multiple parallel chirped pulse fiber amplifiers. , 2012, Optics express.