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

Area of Science:

• Optics and Photonics
• Laser Physics
• Nanotechnology

Background:

• Coherent beam combination is crucial for high-power ultrashort pulsed lasers.
• Existing methods face scalability challenges for large beam arrays.

Purpose of the Study:

• To demonstrate the first two-dimensional diffractive beam combination for ultrashort pulses.
• To present a highly scalable technique for combining large arrays of ultrashort pulsed beams.

Main Methods:

• Utilized a diffractive optic pair for beam combination.
• Coherently combined a square array of eight 120 fs pulsed fiber laser outputs into a single beam.

Main Results:

• The combined pulse successfully preserved the input pulse width and shape.
• Observed combining efficiency close to the theoretical limit of the diffractive optic.
• Found negligible combining loss due to temporal and spatial dispersions.

Conclusions:

• The demonstrated two-dimensional diffractive beam combination is a scalable and effective technique for ultrashort pulses.
• This method offers a promising solution for generating high-intensity ultrashort pulsed laser beams.