Sub-80 fs dissipative soliton large-mode-area fiber laser

Friedrich-Schiller-University Jena, Institute of Applied Physics, Albert-Einstein-Strasse 15, 07745 Jena, Germany.
Optics Letters (Impact Factor: 3.29). 07/2010; 35(13):2311-3. DOI: 10.1364/OL.35.002311
Source: PubMed


We report on high-energy ultrashort pulse generation from an all-normal-dispersion large-mode-area fiber laser by exploiting an efficient combination of nonlinear polarization evolution (NPE) and a semiconductor-based saturable absorber mode-locking mechanism. The watt-level laser directly emits chirped pulses with a duration of 1 ps and 163 nJ of pulse energy. These can be compressed to 77 fs, generating megawatt-level peak power. Intracavity dynamics are discussed by numerical simulation, and the intracavity pulse evolution reveals that NPE plays a key role in pulse shaping.

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    • "Therefore, the timebandwidth product is 31.5, showing that the DSs are chirped, a typical feature of the DSs. It is well known that large-chirped DS pulses can be strongly compressible outside the cavity (e.g. using a transmission grating pair [10], [11]). Because of the lack of required devices, we did not carry out the continuous pulse compression versus compensating dispersion. "
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    ABSTRACT: We propose and demonstrate multiwavelength dissipative soliton (DS) generation in an all-normal-dispersion ytterbium-doped fiber laser based on a graphene-deposited tapered fiber (GDTF) device. Due to the interaction of the graphene with the evanescent field on the taper, the GDTF device possesses the characteristics of both saturable absorption and polarizing effect. Therefore, this device not only initiates the mode-locking operation based on the saturable absorption, but also induces both the special spectral filtering and nonlinear polarization evolution for shaping pulses into DSs. Simultaneous triple-wavelength DS operation around 1035 nm is thus achieved with a pulse energy of 6.4 nJ and pulse duration of 74.6 ps. Moreover, the DS operation is very stable with an RF signal-to-noise ratio of 62.5 dB.
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    • "The birefringent filtering effect, intrinsic to NPE lasers [11], [12], is not present in our laser, due to the PM cavity, thus does not contribute to pulse shaping, in contrast to Refs. [11], [12]. In addition, although our gain bandwidth is larger than Ref. [10], our laser produces a stable, polarized short pulse output, without need of discrete filtering, in a simple, compact all-fiber configuration, where the gain dispersion is the dominant spectral limitation. "
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