Showing papers by "Sergei Popov published in 2012"
TL;DR: In this article, the authors demonstrate mode-locking of a thulium-doped fiber laser operating at 1.94 μm, using a graphene-polymer based saturable absorber.
Abstract: We demonstrate mode-locking of a thulium-doped fiber laser operating at 1.94 μm, using a graphene-polymer based saturable absorber. The laser outputs 3.6 ps pulses, with ~0.4 nJ energy and an amplitude fluctuation ~0.5%, at 6.46 MHz. This is a simple, low-cost, stable and convenient laser oscillator for applications where eye-safe and low-photon-energy light sources are required, such as sensing and biomedical diagnostics.
259 citations
TL;DR: This work demonstrates mode-locking of a thulium-doped fiber laser operating at 1.94 μm, using a graphene-polymer based saturable absorber, which is a simple, low-cost, stable and convenient laser oscillator for applications where eye-safe and low-photon-energy light sources are required.
Abstract: We demonstrate mode-locking of a thulium-doped fiber laser operating at 1.94\mu m, using a graphene-based saturable absorber. The laser outputs 3.6ps pulses, with~0.4nJ energy and an amplitude fluctuation~0.5%, at 6.46MHz. This is a simple, low-cost, stable and convenient laser oscillator for applications where eye-safe and low-photon-energy light sources are required, such as sensing and biomedical diagnostics
250 citations
TL;DR: In this article, the efficiency of supercontinua in optical fiber driven by modulation instability of a continuous-wave (CW) pump source has been investigated, and it is shown that the degree of pump coherence has a dramatic effect on the resulting spectral expansion.
Abstract: We report in detail, both experimentally and using numerical simulation, the efficiency of generation of supercontinua in optical fiber driven by modulation instability of a continuous-wave (CW) pump source. It is shown that the degree of pump coherence has a dramatic effect on the resulting spectral expansion and it is discussed how this can be explained by having the proper conditions for efficient modulation instability to break the CW pump light into a train of fundamental solitons that subsequently undergo self-Raman shift to longer wavelengths. It is proposed that an optimal pump bandwidth exists corresponding to the optimal degree of pump incoherence, defined as a function of the modulation instability period.
33 citations
TL;DR: In this paper, an all-fiber passively mode-locked Ra-man laser using graphene as a saturable absorber was presented. Butt et al. used a different length of a highly non-linear fiber presenting normal disper- sion at both pump and signal wavelengths to provide Raman amplification.
Abstract: W e present an all-fiber passively mode-locked Ra- man laser using graphene as a saturable absorber. Different lengths of a highly non-linear fiber presenting normal disper- sion at both pump and signal wavelengths are used in the cav- ity to provide Raman amplification. The cavity is pumped by a continuous wave Raman laser at 1450 nm, and generates short pulses around 1550 nm, which depending on polarization and filtering parameters can be either at the repetition rate of the cavity or at higher harmonics of it.
30 citations
TL;DR: In this article, the authors demonstrate the generation of a spectrally flat continuous wave supercontinuum by pumping deep in the normal dispersion region, where a Raman cascade forms up to the anomalous dispersion regions, where modulation instability super-continuum dynamics are initiated.
Abstract: We demonstrate the generation of a spectrally flat continuous wave supercontinuum by pumping deep in the normal dispersion region. A Raman cascade forms up to the anomalous dispersion region, where modulation instability supercontinuum dynamics are initiated. The Raman cascade seeds the frequency up-shifted part of the continuum, leading to a spectral flatness of 5 dB from 1.15 to 2.15.
21 citations
TL;DR: A compact, tunable synchronously pumped photonic crystal fiber (PCF)-based optical parametric oscillator (FOPO) that produces anti-Stokes pulses at wavelengths between 757 and 773 nm, with durations of 150 ps at average output powers exceeding 290 mW is reported.
Abstract: We report the development of a compact, tunable synchronously pumped photonic crystal fiber (PCF)-based optical parametric oscillator (FOPO). The oscillator is pumped using a gain-switched laser diode producing 220 ps pulses around 1062 nm, amplified in a ytterbium doped amplifier to peak powers of 3.5 kW. The FOPO produces anti-Stokes pulses at wavelengths between 757 and 773 nm, with durations of 150 ps at average output powers exceeding 290 mW. The output slope efficiency of the device varies with output wavelength from 1.9 to 6.0%.
17 citations
TL;DR: It is reported the development of a 10 GHz repetition rate all-fiber integrated femtosecond source tunable around 1.55 μm, and similar performance was achieved over a 20 nm bandwidth.
Abstract: We report the development of a 10 GHz repetition rate all-fiber integrated femtosecond source tunable around 1.55 μm. A phase modulator and sharp spectral filter are used to convert the output of a tunable CW diode to a 10 GHz pulse train. These pulses are compressed using Raman soliton adiabatic compression in a 21 km long length of fiber to generate sub-300-fs duration pulses at a 10 GHz repetition rate. By tuning the wavelength of the diode and appropriate filtering, similar performance was achieved over a 20 nm bandwidth.
15 citations
TL;DR: In this article, the authors demonstrate gain-guided dissipative soliton operation of a linearly polarized Yb-doped fiber laser, mode-locked by carbon nanotubes.
Abstract: We demonstrate gain-guided dissipative soliton operation of a linearly polarized Yb-doped fiber laser, mode-locked by carbon nanotubes. In the regime of low nonlinear phase shift per cavity roundtrip, a dissipative soliton pulse can be supported by the finite gain bandwidth, without the need for strong spectral selection. The gain-guiding dynamics are confirmed by simulations.
6 citations
06 May 2012
TL;DR: In this article, a mode-locked Raman laser, using 25 m of a GeO 2 doped fiber as the gain medium, was reported employing carbon nanotubes, which generated 850 ps chirped pulses, which were externally compressed to 185 ps.
Abstract: A mode-locked Raman laser, using 25 m of a GeO 2 doped fiber as the gain medium, is reported employing carbon nanotubes. The oscillator generates 850 ps chirped pulses, which are externally compressed to 185 ps.
2 citations
TL;DR: In this paper, two systems exploiting a bias-stabilization free method of producing ultrashort (290fs-1.15ps) pulses up to 20GHz repetition rates using phase modulation combined with spectral masking and subsequent pulse compression using fiber nonlinearities.
Abstract: We present two systems exploiting a bias-stabilisation free method of producing ultrashort (290fs-1.15ps) pulses up to 20GHz repetition rates using phase modulation combined with spectral masking and subsequent pulse compression using fibre nonlinearities.
1 citations