Parallel laser micromachining based on diffractive optical elements with dispersion compensated femtosecond pulses.

Area of Science:

• Materials Science
• Optical Engineering
• Laser Physics

Background:

• Laser micromachining offers high precision but faces challenges with aberrations and pulse distortion.
• Conventional setups limit processing area and efficiency due to diffraction effects.

Purpose of the Study:

• To demonstrate a novel multi-beam laser micromachining technique with high spatial resolution.
• To mitigate chromatic aberrations and pulse stretching for enhanced processing.
• To increase the processing area and efficiency of femtosecond laser micromachining.

Main Methods:

• Utilized femtosecond laser pulses in a multi-beam configuration.
• Implemented a dispersion compensated module (DCM) to counteract optical effects.
• Performed simultaneous drilling of multiple blind holes in a stainless steel sample.

Main Results:

• Significantly mitigated chromatic aberrations and pulse stretching effects.
• Achieved a threefold increase in processing area compared to conventional methods.
• Successfully drilled 52 blind holes simultaneously using 30 fs laser pulses.

Conclusions:

• The developed multi-beam laser micromachining with DCM is effective for high-throughput, high-resolution material processing.
• This technique overcomes limitations of conventional setups, enabling parallel processing with improved efficiency.
• Demonstrated practical application by drilling numerous holes in stainless steel with femtosecond precision.