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Updated: Jun 20, 2026

Direct Imaging of Laser-driven Ultrafast Molecular Rotation
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Picosecond infrared optical parametric generation in KTP using a diode-laser-pumped solid-state laser.

M Ebrahimzadeh, G J Hall, A I Ferguson

    Optics Letters
    |September 29, 2009
    PubMed
    Summary

    We generated tunable picosecond infrared pulses using a KTP-based optical parametric oscillator synchronously pumped by a diode-laser-pumped Nd:YLF laser. This system offers tunable near-infrared output with stable, high-energy pulses.

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    Area of Science:

    • Optics and Photonics
    • Laser Physics
    • Nonlinear Optics

    Background:

    • Optical parametric oscillators (OPOs) are crucial for generating tunable laser light.
    • Picosecond pulse generation is essential for high-resolution spectroscopy and nonlinear optics.
    • Diode-laser-pumped solid-state lasers offer efficient and compact pumping solutions.

    Purpose of the Study:

    • To develop a tunable picosecond infrared light source.
    • To investigate synchronous pumping of a KTP-based optical parametric oscillator.
    • To characterize the output properties of the generated tunable pulses.

    Main Methods:

    • Synchronous pumping of a potassium titanyl phosphate (KTP) optical parametric oscillator.
    • Utilizing a frequency-doubled, actively mode-locked, Q-switched, diode-laser-pumped Nd:YLF laser operating at 523.5 nm.

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  • Characterizing output tunability, pulse duration, average power, repetition rate, and amplitude stability.

    • Main Results:

    • Tunable near-infrared radiation generated in the 0.946-1.020 µm and 1.075-1.172 µm ranges.
    • Pulses with approximately 8-picosecond duration and average output powers approaching 2 mW.
    • Observed threshold Q-switched pulse energy of 4 µJ and pump depletions up to 56%.
    • Amplitude stability of +/-2% achieved at high pumping intensity.

    Conclusions:

    • Successful generation of tunable picosecond infrared pulses via synchronous pumping of a KTP OPO.
    • The system demonstrates efficient nonlinear frequency conversion with good stability.
    • This tunable picosecond source is suitable for various spectroscopic and nonlinear optical applications.