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Updated: Jun 22, 2026

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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Automated phase characterization and adaptive pulse compression using multiphoton intrapulse interference phase scan

D Ahmasi Harris, Janelle C Shane, Vadim V Lozovoy

    Optics Express
    |June 18, 2009
    PubMed
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    We present air-MIIPS, a novel single-beam technique for characterizing and compressing ultrashort femtosecond laser pulses. This method effectively corrects high-order phase distortions using third-order harmonic generation in air.

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    Area of Science:

    • Ultrafast optics
    • Nonlinear optics
    • Laser science

    Background:

    • Ultrashort femtosecond laser pulses are crucial for advanced scientific applications.
    • Characterizing and compressing these pulses is essential for optimizing their performance.
    • Existing methods for spectral phase characterization can be complex and require interferometric setups.

    Purpose of the Study:

    • To develop a non-interferometric, single-beam method for automated spectral phase characterization.
    • To enable adaptive pulse compression of amplified ultrashort femtosecond pulses.
    • To compensate for high-order phase distortions in laser pulses.

    Main Methods:

    • Utilizing third-order harmonic generation in air.
    • Implementing a multiphoton intrapulse interference phase scan (MIIPS) technique.
    • Developing a single-beam, non-interferometric approach named air-MIIPS.

    Main Results:

    • Demonstrated automated spectral phase characterization of femtosecond pulses.
    • Achieved adaptive pulse compression by compensating for phase distortions.
    • Validated the effectiveness of the air-MIIPS method for high-order phase correction.

    Conclusions:

    • The air-MIIPS method offers a simplified and efficient approach to pulse characterization and compression.
    • This technique is suitable for amplified ultrashort femtosecond laser systems.
    • Non-interferometric spectral phase characterization using nonlinear processes in air is feasible and effective.