Graphene-gold supercapacitor as a voltage controlled saturable absorber for femtosecond pulse generation
Date
2016-02Source Title
Optics Letters
Print ISSN
0146-9592
Publisher
Optical Society of America
Volume
41
Issue
5
Pages
910 - 913
Language
English
Type
ArticleItem Usage Stats
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Abstract
We report, for the first time to the best of our knowledge, use of a graphene-gold supercapacitor as a voltage controlled fast saturable absorber for femtosecond pulse generation. The unique design involving only one graphene electrode lowers the insertion loss of the device, in comparison with capacitor designs with two graphene electrodes. Furthermore, use of the high-dielectric electrolyte allows reversible, adjustable control of the absorption level up to the visible region with low bias voltages of only a few volts (0-2 V). The fast saturable absorber action of the graphene-gold supercapacitor was demonstrated inside a multipass-cavity Cr:forsterite laser to generate nearly transform-limited, sub-100 fs pulses at a pulse repetition rate of 4.51 MHz at 1.24 μm.
Keywords
CapacitorsElectrodes
Electrolytes
Electromagnetic pulse
Gold
Graphene
Graphite electrodes
Pulse repetition rate
Saturable absorbers
Ultrashort pulses
Absorption levels
Capacitor design
Cr : Forsterite laser
Femtosecond pulse generation
Graphene electrodes
High dielectrics
Low bias voltage
Voltage-controlled
Pulse generators