Connected the 397nm #laser to the wavemeter for the first time and got my first (open loop) frequency stability measurements.   Doesn't look bad, the drift is slow so that noise might be reduced with more averaging.   The linewidth for Ca+ ion Doppler cooling is 23MHz so it's in the right order of magnitude already.   Ignore the five stacked attenuators.   #physics #accelerators<p><a href='posts/202610/post-20261012-195749-a.jpg'><img src='posts/202610/post-20261012-195749-a.jpg' loading='lazy' /></a></p><p><a href='posts/202610/post-20261012-195749-b.png'><img src='posts/202610/post-20261012-195749-b.png' loading='lazy' /></a></p><p><a href='posts/202610/post-20261012-195749-c.png'><img src='posts/202610/post-20261012-195749-c.png' loading='lazy' /></a></p>