In particular compact and small-sized laser systems are highly desirable in these fields due to their increased stability and lowered operating costs making them easier to integrate into devices with

The logic of this paragraph is that for certain fields, such as medical and industrial applications, compact and small-sized laser systems are preferred due to their increased stability and lowered operating costs. These benefits make them easier to incorporate into devices that have limited space.

A possible rephrased version of this paragraph could be:

Compact and small-sized laser systems are highly sought after in fields like medicine and industry because of their improved stability and reduced operating expenses. This makes them more compatible with devices that have limited space, thus increasing their usefulness.