High bandwidth frequency modulation of an external cavity diode laser using an intracavity lithium niobate electro-optic modulator as output coupler
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Date
2022
Authors
Palmer, S.
Boes, A.
Ren, G.
Nguyen, T.G.
Tempone-Wiltshire, S.J.
Longhurst, N.
Farrell, P.
Steiner, A.
Marciniak, C.D.
Monz, T.
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Journal article
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APL Photonics, 2022; 7(8)
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S. Palmer, a, A. Boes, G. Ren, T. G. Nguyen, S. J. Tempone-Wiltshire, N. Longhurst, P. M. Farrell, A. Steiner, Ch. D. Marciniak, T. Monz, A. Mitchell, and R. E. Scholten
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Abstract
We present a novel approach to high bandwidth laser frequency modulation. A lithium niobate chip is used as an intracavity electro-optic modulator in a tunable cateye external cavity diode laser. The modulator is conveniently integrated with the cateye output coupler, providing a unique approach to high bandwidth frequency stabilization and linewidth narrowing. The intracavity modulator feedback was successfully operated below one volt and achieved superior frequency noise suppression compared to conventional feedback through diode injection current modulation. A closed loop bandwidth of 1.8 MHz was demonstrated, and the laser linewidth reduced to around 1 Hz as measured by heterodyne measurement.
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© 2022 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).