Single-walled carbon nanotubes (SWCNT) have emerged as promising material for saturable absorbers in laser mode locking, given the fast recovery time and a broad spectral range in the near infared. SWCNT-based saturable absorbers are usually fabricated using organic polymers as matrix.  However, polymer matrix can decompose on higher temperatures or in high energy light exposition. Compared to the polymer, sol–gel soft glass has a higher optical and environmental damage threshold, and mechanical stability.  Therefore, a sol-gel process for the fabrication for glass matrix can be a better way to produce thermally stable SWCNT composites.
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