Abstract
High-frequency noise in an output optical pulse severely affects amplitude stability and pulse within the high-power acousto-optic Q-switched diode-pumped solid-state laser. In this study, we assessed the output optical pulse via fast Fourier transform (FFT) method under high pump power conditions to find that high-frequency noise in the output optical pulse is chiefly concentrated in the 0.25–1.8 GHz frequency band. High-frequency noise within 0.25–1 GHz and 1–1.8 GHz is mainly caused by high transverse and multi-longitudinal modes in the laser resonator. Our experimental and theoretical analysis results are in close accordance; both indicate that mode competition is the main factor affecting the output optical pulse high-frequency noise.
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