Femtosecond pulse generation with voltage-controlled graphene saturable absorber

Abstract

We report, for the first time to our knowledge, the demonstration of a graphene supercapacitor as a voltage-controlled saturable absorber for femtosecond pulse generation from a solid-state laser. By applying only a few volts of bias, the Fermi level of the device could be shifted to vary the insertion loss, while maintaining a sufficient level of saturable absorption to initiate mode-locked operation. The graphene supercapacitor was operated at bias voltages of 0.5–1V to generate sub-100 fs pulses at a pulse repetition rate of 4.51 MHz from a multipass-cavity ${\mathrm{Cr}}^{4+}$:forsterite laser operating at 1255 nm. The nonlinear optical response of the graphene supercapacitor was further investigated by using pump–probe spectroscopy.

© 2014 Optical Society of America

Graphene-gold supercapacitor as a voltage controlled saturable absorber for femtosecond pulse generation

Isinsu Baylam, Osman Balci, Nurbek Kakenov, Coskun Kocabas, and Alphan Sennaroglu
Opt. Lett. 41(5) 910-913 (2016)

Femtosecond pulse generation from a Ti³⁺:sapphire laser near 800  nm with voltage reconfigurable graphene saturable absorbers

Isınsu Baylam, Sarper Ozharar, Nurbek Kakenov, Coskun Kocabas, and Alphan Sennaroglu
Opt. Lett. 42(7) 1404-1407 (2017)

Graphene mode-locked multipass-cavity femtosecond Cr⁴⁺: forsterite laser

Sarper Ozharar, Isinsu Baylam, M. Natali Cizmeciyan, Osman Balci, Ercag Pince, Coskun Kocabas, and Alphan Sennaroglu
J. Opt. Soc. Am. B 30(5) 1270-1275 (2013)

Broadband terahertz modulators using self-gated graphene capacitors

Nurbek Kakenov, Osman Balci, Emre O. Polat, Hakan Altan, and Coskun Kocabas
J. Opt. Soc. Am. B 32(9) 1861-1866 (2015)

Controlled stacking of graphene monolayer saturable absorbers for ultrashort pulse generation in erbium-doped fiber lasers

Henrique G. Rosa, Juan A. Castañeda, Carlos H. Brito Cruz, Lázaro A. Padilha, José C. V. Gomes, Eunézio A. Thoroh de Souza, and Hugo L. Fragnito
Opt. Mater. Express 7(7) 2528-2537 (2017)