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Updated: Feb 20, 2026

Developing High Performance GaP/Si Heterojunction Solar Cells
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Picosecond difference-frequency-generation in orientation-patterned gallium phosphide.

J C Casals, S Parsa, S Chaitanya Kumar

    Optics Express
    |October 19, 2017
    PubMed
    Summary
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    Multi-GHz repetition rate, tunable ultrafast mid-IR source.

    Optics letters·2025

    Researchers developed a new mid-infrared radiation source using orientation-patterned gallium phosphide (OP-GaP). This novel technology achieves tunable picosecond pulses, marking a significant advancement in nonlinear optics and laser technology.

    Area of Science:

    • Nonlinear Optics
    • Quantum Electronics
    • Materials Science

    Background:

    • Mid-infrared radiation is crucial for spectroscopy and sensing.
    • Developing efficient and tunable sources in this range remains a challenge.
    • Quasi-phase-matched nonlinear materials offer enhanced frequency conversion efficiency.

    Purpose of the Study:

    • To demonstrate a novel picosecond radiation source in the mid-infrared.
    • To utilize orientation-patterned gallium phosphide (OP-GaP) for frequency conversion.
    • To achieve tunable output with high repetition rates.

    Main Methods:

    • Single-pass difference-frequency-generation (DFG) was employed.
    • A picosecond optical parametric oscillator (OPO) provided the input signal (1609-1637 nm).

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  • Pump pulses at 1064 nm were used with a 40-mm OP-GaP crystal.

    • Main Results:

    • Tunable mid-infrared radiation was generated from 3040-3132 nm.
    • Up to 57 mW of average power was achieved at an 80 MHz repetition rate.
    • Power stability was better than 3.2% rms over 1 hour with good beam quality.

    Conclusions:

    • This work presents the first picosecond frequency conversion source based on OP-GaP.
    • OP-GaP is a promising material for generating tunable mid-infrared radiation.
    • The developed source has potential applications in spectroscopy and optical sensing.