2 research outputs found
Coherent photo-thermal noise cancellation in a dual-wavelength optical cavity for narrow-linewidth laser frequency stabilisation
Optical resonators are used for the realisation of ultra-stable frequency
lasers. The use of high reflectivity multi-band coatings allows the frequency
locking of several lasers of different wavelengths to a single cavity. While
the noise processes for single wavelength cavities are well known, the
correlation caused by multi-stack coatings has as yet not been analysed
experimentally. In our work, we stabilise the frequency of a nm and a
nm laser to one mirror pair and determine the residual-amplitude
modulation (RAM) and photo-thermal noise (PTN). We find correlations in PTN
between the two lasers and observe coherent cancellation of PTN for the
nm coating. We show that the fractional frequency instability of the
nm laser is limited by RAM at . The instability of the
nm laser is at close to the thermal noise limit of
.Comment: 17 pages, 5 figure
Supplementary document for Coherent photo-thermal noise cancellation in a dual-wavelength optical cavity for narrow-linewidth laser frequency stabilisation - 6788518.pdf
Equations used for fitting to the data in Figure 2 and