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Supercontinuum
About: Supercontinuum is a research topic. Over the lifetime, 7071 publications have been published within this topic receiving 127671 citations.
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TL;DR: It is found that the degradation of the SC coherence can be effectively controlled by a correct choice of input intensity and fiber length and a high degree of coherence correlates with the spectrum shape in the vicinity of the Raman threshold, providing an convenient experimental observable.
Abstract: Measurements of the Raman gain spectra in the SF6 and SF57 highly nonlinear glasses demonstrated twice as high Raman shift in comparison with the fused silica. Numerical simulation predicted that a large Raman shift in combination with high nonlinearity can significantly reduce the required input pulse intensity for supercontinuum in these glasses, retaining the necessary degree of coherence. We found that the degradation of the SC coherence due to Raman soliton jitter can be effectively controlled by a correct choice of input intensity and fiber length. Also it was found that a high degree of coherence correlates with the spectrum shape in the vicinity of the Raman threshold, providing an convenient experimental observable.
55 citations
TL;DR: In this article, the off-resonance Raman spectra of As2S3, GeS2, Ge25Ga5S70, Ge23As12S65,====== Ge23Sb12S 65, and====== Ge17Ga4Sb10S69 chalcogenide glasses have been recorded and the corresponding Raman gain coefficients have been calculated in order to evaluate the role of Ge, Ga, Sb, and As on a novel highly nonlinear microstructured optical fibers.
Abstract: The off-resonance Raman spectra of As2S3,
GeS2, Ge25Ga5S70,
Ge23As12S65,
Ge23Sb12S65, and
Ge17Ga4Sb10S69 chalcogenide glasses
have been recorded and the corresponding Raman gain coefficients have been
calculated in order to evaluate the role of Ge, Ga, Sb, and As on a novel
Ge17Ga4Sb10S69 glass proposed for
highly nonlinear microstructured optical fibers. We calculated the Raman response
functions of
As2S3n2=2.3×10−17 m2/W,
G∼2.78×10−11 m/W; and
Ge17Ga4Sb10S69 n2=1.8×10−17 m2/W,
G∼1.57×10−11 m/W glasses.
The supercontinuum generation of a three-air-hole
Ge17Ga4Sb10S69 fiber was simulated,
challenging the properties of a similar fiber design made of
As2S3 chalcogenide glass. We calculated the zero dispersion
wavelengths of Ge17Ga4Sb10S69 fibers
with the core diameters of 1.2, 1.5, and 2.0 μm at
λ=1.48, 1.66, and 1.75 μm in comparison with
λ=1.60, 1.87, and 1.98 μm obtained for
As2S3 fibers.
55 citations
TL;DR: In this paper, a supercontinuum (SC) light source generated by noise-like pulses from an Yb-doped fiber laser was used for OCT imaging of bio-tissue.
Abstract: We report on the ultrahigh-resolution optical coherence tomography (OCT) with a novel high-power supercontinuum (SC) light source generated by noise-like pulses from an Yb-doped fiber laser. The SC spectrum is flat with a bandwidth of 420 nm centered around ~1.3 μm. The light source is successfully employed in a time-domain OCT (TD-OCT), achieving an axial resolution of 2.3 μm. High resolution fiber-based spectral-domain OCT (SD-OCT) imaging of bio-tissue was also demonstrated.
55 citations
TL;DR: A large short-term polarization noise is identified in this type of supercontinuum generation that has been masked by the total-intensity measurement in the past, but can be easily detected by filtering thesupercontinuum with a linear polarizer.
Abstract: The supercontinuum generated exclusively in the normal dispersion regime of a nonlinear fiber is widely believed to possess low optical noise and high spectral coherence. The recent development of flattened all-normal dispersion fibers has been motivated by this belief to construct a general-purpose broadband coherent optical source. Somewhat surprisingly, we identify a large short-term polarization noise in this type of supercontinuum generation that has been masked by the total-intensity measurement in the past, but can be easily detected by filtering the supercontinuum with a linear polarizer. Fortunately, this hidden intrinsic noise and the accompanied spectral decoherence can be effectively suppressed by using a polarization-maintaining all-normal dispersion fiber. A polarization-maintaining coherent supercontinuum laser is thus built with a broad bandwidth (780-1300 nm) and high spectral power (~1 mW/nm).
55 citations
TL;DR: It is shown that Bessel beams can be created from temporally incoherent broadband light sources including a halogen bulb and by using a supercontinuum source how the beam behaves as a function of bandwidth of the incident light field is elucidated.
Abstract: Propagation invariant light fields such as Bessel light beams are of interest in a variety of current areas such as micromanipulation of atoms and mesoscopic particles, laser plasmas, and the study of optical angular momentum. Considering the optical fields as a superposition of conical waves, we discuss how the coherence properties of light play a key role in their formation. As an example, we show that Bessel beams can be created from temporally incoherent broadband light sources including a halogen bulb. By using a supercontinuum source we elucidate how the beam behaves as a function of bandwidth of the incident light field.
55 citations