If I remember correctly, laser turntables were not popular because they also reproduced all the fine dust on the surface of the disk.
- low pass filter. Assuming the dust is small compared to the expected movement in the groove, you can filter it out electornically.
- dust detector. Nikon had a cool 35mm scanner... instead of RGB, it had an additional IR layer at an angle just to detect dust. So, automated dust removal tools knew if a black spot in an image was supposed to be there, or if it was actually dust. Here, extra optics would know if the laser was reading dust and could mute/filter the sound during that time.
The 'dust detector' is 'Digtal ICE' that you'll sometimes see labeled on scanners. (https://en.wikipedia.org/wiki/Digital_ICE)