Abstract
Pulse lasing driven by a real saturable absorber (SA) in a fibre laser cavity is conditional on modulation characteristics determined by the nonlinear material and implementation geometry of the SA. Generally, these parameters can be only preset during the SA fabrication. For instance, modulation depth of a single-wall carbon nanotube saturable absorber (SWCNT-SA) sandwiched between fibre connectors is governed by its thickness [1]. Here we demonstrate electronic control of pulse lasing regimes in an all-PM fibre laser by using an original electrochemically gated in-line SWCNT-SA. Earlier it was shown that electric gating of graphene can alter its nonlinear optical properties [2], but for SWCNT, to the best of our knowledge, there were no such studies.
| Original language | English |
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| DOIs | |
| Publication status | Published - Jun 2019 |
| MoE publication type | Not Eligible |
| Event | European Conference on Lasers and Electro-Optics and the European Quantum Electronics Conference - Munich, Germany Duration: 23 Jun 2019 → 27 Jun 2019 |
Conference
| Conference | European Conference on Lasers and Electro-Optics and the European Quantum Electronics Conference |
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| Abbreviated title | CLEO/Europe-EQEC |
| Country/Territory | Germany |
| City | Munich |
| Period | 23/06/2019 → 27/06/2019 |
Funding
Laser characteristics were measured in both ML and QS regimes at a pump power of 90 mW (λpump=980 nm). The corresponding optical and radiofrequency (RF) spectra of laser radiation are shown in Fig 2. The laser generated sub-picosecond pulses at the fundamental repetition rate of 50 MHz in the ML regime, and microsecond pulses at a kHz-scale repetition rate in the QS regime. The per-pulse energy was 3 pJ and 12.5 nJ, respectively. The voltage-induced switching of laser characteristics was reproducible with a slight hysteresis. Thus, effective electronic control of pulse lasing in fibre lasers with the gated SWCNT-SA was established. This work was supported in part by the Russian Foundation for Basic Research (Grant No. 18-32-20021).