Abstract
Lasers emitting around 2 μm (eye-safe spectral range) are of practical importance for remote sensing, spectroscopy and medicine. Such emission is typically achieved from Tm3+ (3F4 → 3H6 transition) and Ho3+ ions (5I7 → 5I8 transition). The search for appropriate saturable absorbers (SAs) for passive Q-switching (PQS) of ~2 μm lasers is still ongoing. While “slow” SAs, e.g. Cr2+:ZnS, are well-established, “fast” SAs for high-repetition-rate (MHz-range) PQS or mode-locking are still under investigation. The technology of semiconductor saturable absorbers (SESAs) at ~2 μm is far from being mature. In the present work, we studied the potential of carbon nanostructures (single-walled carbon nanotubes, SWCNTs, [1] and graphene) as possible alternatives to SESAs.
© 2017 IEEE
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