Abstract

Active frequency-chirp control for a narrowband pulsed titanium–sapphire laser oscillator–amplifier laser system is demonstrated using an intra-cavity electro-optic modulator, resulting in improved spectral resolution and stability. Beat-note measurements of its output to a continuous-wave laser locked to an optical frequency comb yields an Allan deviation of $5 \times {10^{- 11}}$ (at 10 s). Correction of residual chirp from a comparison with the fourth-harmonic upconverted pulsed output to a molecular ${{\rm{H}}_2}$ two-photon resonance delivers a value for the uncertainty contribution due to frequency chirp below the $1.5 \times {10^{- 10}}$ level.

© 2020 Optical Society of America

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