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  • Laser Linewidth Measurement System

    Laser Linewidth Measurement System

    The laser linewidth measurement system is based on the delayed self-heterodyne interferometry principle. An AOM modulator is used as the frequency shifter in the delayed self-heterodyne interferometer. The system includes a high-gain photoreceiver/photodetector, a low-noise RF amplifier (LNA), and a high-resolution spectrum analyzer for measurement. The system features high sensitivity and allows the measurement and analysis of laser linewidths as low as 2 kHz.

    Core Functions and Features

    Measurable Wavelength Bands
    C-band, 1 μm wavelength band, 2 μm wavelength band

    High-Sensitivity Detection
    Low-noise balanced detectors and high-linearity amplifiers are used to ensure accurate extraction of weak noise signals.

    Environmental Interference Resistance Design
    Through special vibration-isolation design, the system’s resistance to environmental interference is improved, ensuring normal operation even in harsh environments.

  • Laser Noise Measurement System

    Laser Noise Measurement System

    This system is specifically designed for high-precision measurement of laser relative intensity noise (RIN). It is suitable for noise characterization of various light sources, including narrow-linewidth fiber lasers and semiconductor lasers. The system employs low-noise photodetection, high-resolution spectrum analysis, and digital signal processing technology to accurately characterize the intensity noise performance of lasers, providing reliable test data for scientific research and industrial applications.

    Core Functions and Features

    Measurable Wavelength Bands
    C band, 1 μm, 780 nm, 2 μm, and visible wavelength bands

    Wide Dynamic Range Measurement
    Supports RIN testing from near the quantum limit (−160 dB/Hz) up to high-frequency ranges (>10 MHz), covering typical laser noise spectra.

    High-Sensitivity Detection
    Utilizes low-noise balanced detectors and high-linearity amplifiers to ensure accurate extraction of weak noise signals.

    Multi-Band Analysis
    Integrates baseband FFT analyzer and RF spectrum analyzer functions to enable noise power spectral density (PSD) measurements from DC to the GHz range.

    Environmental Interference Resistance Design
    Special vibration-isolation design enhances resistance to environmental interference, ensuring reliable operation even under harsh conditions.

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