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#### Strong reduction of laser power noise by means of a Kerr nonlinear cavity

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PhysRevA_80_053801.pdf

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##### Citation

Khalaidovski, A., Thüring, A., Rehbein, H., Lastzka, N., Willke, B., Danzmann, K., et al. (2009).
Strong reduction of laser power noise by means of a Kerr nonlinear cavity.* Physical Review A,*
*80*(5): 053801. doi:10.1103/PhysRevA.80.053801.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0013-469F-C

##### Abstract

We demonstrated the power noise reduction of a continuous-wave laser field by means of an effective third-order Kerr nonlinear cavity. In contrast to conventional noise reduction schemes relying on linear cavities, a strong noise suppression at Fourier frequencies below the linewidth of the nonlinear cavity was possible. The laser light was reflected off a Kerr nonlinear cavity that had a half width half maximum linewidth of 4.5 MHz. The cavity was operated slightly off-resonance at approximately half of the maximum power buildup, close to its so-called critical state; a power noise reduction of up to 32 dB at Fourier frequencies below 1 MHz was observed after reflection. The effective third-order nonlinearity was a so-called cascaded second-order nonlinearity of MgO:LiNbO3. The laser had a power of 0.75 W at the wavelength of 1064 nm.