Femtosecond pulse generation with voltage-controlled graphene saturable absorbers

Baylam, I., Cizmeciyan, M.N., Ozharar, S., Polat, E.O., Kocabas, C. and Sennaroglu, A. (2014) Femtosecond pulse generation with voltage-controlled graphene saturable absorbers. Optics Letters, 39(17), pp. 5180-5183. (doi: 10.1364/OL.39.005180) (PMID:25166104)

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 Cr4+:forsterite laser operating at 1255 nm. The nonlinear optical response of the graphene supercapacitor was further investigated by using pump–probe spectroscopy.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Polat, Dr Emre Ozan
• Authors: Baylam, I., Cizmeciyan, M.N., Ozharar, S., Polat, E.O., Kocabas, C., and Sennaroglu, A.
• Subjects: Q Science > QC Physics
• College/School: College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
• Journal Name: Optics Letters
• Publisher: Optical Society of America
• ISSN: 0146-9592
• ISSN (Online): 1539-4794