Generation of 32nd harmonic in passively mode-locked erbium-doped laser with graphene saturable absorber
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Abstract:
We report passive mode locking of a soliton erbium-doped fiber laser based on graphene saturable absorber at repetition rate continuously scalable up to 500 MHz. The supermodes are suppressed by 50 dB at 32nd harmonic.Keywords:
Saturable absorption
Erbium
Mode-Locking
Harmonic
We report passive mode locking of a soliton erbium-doped fiber laser based on graphene saturable absorber at repetition rate continuously scalable up to 500 MHz. The supermodes are suppressed by 50 dB at 32nd harmonic.
Saturable absorption
Erbium
Mode-Locking
Harmonic
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We demonstrate a passively Q-switched erbium-doped fiber laser (EDFL) based on graphene as a saturable absorber (SA). Two fiber Bragg gratings (FBGs) are used as the end mirrors in an all-fiber linear cavity. The Q-switched EDFL has a pump threshold of 68.2 mW. The minimum pulse duration is 0.85 μs and the highest pulse energy is 40.9 nJ. The pulse repetition rate of the fiber laser can be widely changed from 51.1 to 118.1 kHz by increasing the pump power from 68.2 to 400 mW.
Saturable absorption
Pulse duration
Erbium
Fiber Bragg Grating
Q-switching
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We demonstrate a simple mode-locked Erbium-doped fiber laser (EDFL) based on self-synthesized saturable absorber (SA) by combining graphene oxide (GO) and polyethylene oxide (PEO) solutions to form a GO-PEO thin film. This thin film was incorporated into an Erbium-doped fiber laser (EDFL) with a cavity length of 9 m. Our EDFL could operate at a 22 MHz repetition rate with a 0.8 ps pulse duration. The laser also showed stable soliton pulses under various laser pump power values. Our reported results show that GO-PEO SA is effective and proven as a cost-effective material for saturable absorbers for EDFLs.
Saturable absorption
Erbium
Pulse duration
Mode-Locking
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Abstract Passively Q-switched erbium-doped fiber laser (EDFL) have been demonstrated using graphene oxide (GO) film as saturable absorber (SA). The aim of this experiment is to generate and demonstrate passively Q-Switched Erbium-doped fiber laser (EDFL) using GO as a saturable absorber. Stable Q-switched operation can be achieved at 1558.8 nm. By increasing the pump power from 26.32mW to 71.65mW, the repetition rate also increased from 30.58 kHz to 51.81k Hz. The pulse width of the laser were 11.2 – 4.73 µs. The maximum output power and maximum peak power obtained are 128 µW and 521.98 µW respectively at a pump power of 71.65 mW. The pulse energy reaches 2.47nJ. These results show that GO is a new potential SA material for pulsed laser applications.
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Erbium
Q-switching
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A Graphene-based saturable absorber is fabricated using wet chemistry techniques. We use it to passively mode-lock an Erbium doped fiber laser. ~500fs pulses are produced at 1560nm with a 5.2nm spectrum bandwidth.
Saturable absorption
Mode-Locking
Erbium
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Mechanically exfoliated graphene saturable absorber based all-polarization maintaining passively mode-locked erbium doped fiber laser is presented. The laser consists of fully polarization maintaining (PM) fibers and components, providing linear output polarization state. The saturable absorber was formed by mechanical exfoliation of graphene flakes from pure graphite and deposited on a fiber connector. It was characterized using atomic force microscopy and Raman spectroscopy. Laser resonators with repetition frequency of 45.88 MHz and 114.1 MHz were investigated. The soliton pulses at 1555 nm were achieved with duration around 600 fs. The splicing procedure of PM-fibers was also optimized which results in improvement of degree of polarization (DOP).
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Mode-Locking
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We demonstrate an erbium-doped fiber laser passively mode-locked by few layers of graphene prepared by the mechanical exfoliation of the high oriented pyrolytic graphite through the Scotch-tape method. This all-fiber ring cavity delivered a pulse train with a repetition rate of 1.646 MHz and pulse duration of 1.656 ps. By continuously adjusting the laser cavity parameters, one can observe various soliton patterns, such as ordered-, chaotic-, bunched-, and harmonic-multisoliton state. This evidenced that a mode-locked fiber laser based on graphene saturable absorber indeed provided a well-controlled nonlinear optics platform for soliton dynamics study.
Saturable absorption
Mode-Locking
Erbium
Pulse duration
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Er:glass lasers are useful for a large number of applications because they emit in a narrow eye-safe region around 1.53 μm. For many of these applications a Q-switched pulse is required. Active Q-switches increase the complexity and the cost of the system. Passive Q-switches such as saturable absorbers remain the simplest and cheapest method.1-4
Saturable absorption
Erbium
Q-switching
Crystal (programming language)
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Abstract In this paper, passively Q-switched fiber laser is demonstrated and the laser output energy is stabilized by using 2.4 m Erbium-doped fiber laser (EDFL) with a graphene oxide used as saturable absorber (GO-SA). According to the experimental results in the Q-switched configuration, the laser cavity emits a wavelength centered at 1,558.75 nm, and by inserting the GO-SA into EDFL cavity, hence, the laser output energy around 1.68 nJ with an FWHM pulse width of 2.3 µs at 123.5 kHz was achieved.
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Erbium
Q-switching
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We present a 440 fs, 9.2 GHz hybrid mode-locked fiber laser incorporating a SESAM in a regeneratively mode-locked laser cavity. A combination of higher-order solitons and saturable absorption enables very efficient pulse narrowing with no pedestals.
Saturable absorption
Erbium
Mode-Locking
Mode (computer interface)
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