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Diffractive variable attenuator for femtosecond laser radiation control.

Alexander G Poleshchuk1, Ruslan K Nasyrov, Vadim V Cherkashin

  • 1Institute of Automation and Electrometry SB RAS, Ak. Koptyuga 1, Novosibirsk 630090, Russia. poleshchuk@iae.nsk.su

Applied Optics
|February 3, 2009
PubMed
Summary

We developed a new diffractive phase variable attenuator for precise femtosecond laser power control. This device manages high laser intensities without distorting the beam or its spectrum.

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Area of Science:

  • Optics and Photonics
  • Laser Physics
  • Materials Science

Background:

  • Precise control of high-power femtosecond laser radiation is crucial for various scientific and industrial applications.
  • Existing methods for laser attenuation often introduce spectral or spatial distortions, limiting their utility.
  • The need for robust, broadband attenuators capable of handling extreme light intensities remains a challenge.

Purpose of the Study:

  • To introduce a novel diffractive phase variable attenuator for femtosecond laser power management.
  • To demonstrate the attenuator's capability to control high laser power densities without compromising beam quality.
  • To evaluate the device's performance across a wide range of wavelengths.

Main Methods:

  • Design and fabrication of a diffractive optical element acting as a phase variable attenuator.

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  • Characterization of the attenuator's performance using femtosecond laser pulses.
  • Measurement of transmitted power, spectral profiles, and beam shapes at various attenuation levels.

    • Main Results:

    • The diffractive phase variable attenuator successfully controlled femtosecond laser power up to 0.75 x 10^13 W/cm^2.
    • Minimal distortions in the laser spectra and beam shape were observed during attenuation.
    • The attenuator demonstrated broadband operation from the deep ultraviolet (DUV) to the infrared (IR) spectral regions.

    Conclusions:

    • The developed diffractive phase variable attenuator offers a highly effective solution for controlling high-intensity femtosecond laser radiation.
    • Its ability to maintain beam quality and operate across a broad spectral range makes it suitable for diverse applications.
    • This technology advances the capabilities for precise laser manipulation in demanding optical experiments.