Laser linewidth measurements using digital holography

Douglas E. Thornton; Mark F. Spencer; Christopher A. Rice; Glen P. Perram

doi:10.1117/12.2529624

6 September 2019 Laser linewidth measurements using digital holography

Douglas E. Thornton, Mark F. Spencer, Christopher A. Rice, Glen P. Perram

Proceedings Volume 11135, Unconventional and Indirect Imaging, Image Reconstruction, and Wavefront Sensing 2019; 111350F (2019) https://doi.org/10.1117/12.2529624
Event: SPIE Optical Engineering + Applications, 2019, San Diego, California, United States

Abstract

This paper measures the mixing efficiency of a digital holography system at various optical path differences and hologram integrations times. From the measurements, the master oscillator (MO) laser spectral lineshape and linewidth is estimated. The lineshape was Gaussian, which is indicative of laser frequency flicker noise or 1/f noise, and the linewidth decreased by 65% when the integration time was decreased from 100 ms to 0.1 ms. This reduction in the observed MO laser linewidth yields an increased coherence length and time of 280%. A flicker noise model for the linewidth and integration time is used and approximates the measurements to within 17%.

Citation Download Citation

Douglas E. Thornton, Mark F. Spencer, Christopher A. Rice, and Glen P. Perram "Laser linewidth measurements using digital holography", Proc. SPIE 11135, Unconventional and Indirect Imaging, Image Reconstruction, and Wavefront Sensing 2019, 111350F (6 September 2019); https://doi.org/10.1117/12.2529624

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