Fiber-optic Cherenkov radiation in the few-cycle regime

Chang, Guoqing; Chen, Li-Jin; Kärtner, Franz X.

doi:10.1364/oe.19.006635

Cited by 46 publications

(11 citation statements)

References 38 publications

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“…These notch waveguides facilitate dispersive wave generation [41][42][43][44] where a significant portion of the pump energy, as high as 40% depending on the pump pulse duration 44 , is transferred into a spectral peak with its center wavelength in the normal dispersion regime. The exact wavelength of the dispersive wave depends on the pump parameters and waveguide geometry and can be tailored using the phase matching condition 45 defined by 0.…”

Section: Waveguide Geometries and Dispersion Profilesmentioning

confidence: 99%

Versatile silicon-waveguide supercontinuum for coherent mid-infrared spectroscopy

et al. 2018

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Infrared spectroscopy is a powerful tool for basic and applied science. The molecular "spectral fingerprints" in the 3 µm to 20 µm region provide a means to uniquely identify molecular structure for fundamental spectroscopy, atmospheric chemistry, trace and hazardous gas detection, and biological microscopy. Driven by such applications, the development of low-noise, coherent laser sources with broad, tunable coverage is a topic of great interest. Laser frequency combs possess a unique combination of precisely defined spectral lines and broad bandwidth that can enable the above-mentioned applications.Here, we leverage robust fabrication and geometrical dispersion engineering of silicon nanophotonic waveguides for coherent frequency comb generation spanning 70 THz in the mid-infrared (2.5 µm to 6.2 µm). Precise waveguide fabrication provides significant spectral broadening and engineered spectra targeted at specific mid-infrared bands. We use this coherent light source for dual-comb spectroscopy at 5 µm.Spectroscopy has been a primary scientific tool for studying nature, leading to seminal advances in astronomy, quantum physics, chemistry and biology. The coherent light from a laser provides a powerful spectroscopic tool with the properties of high spectral resolution, wavelength tunability, and a well-defined Gaussian beam enabling high intensity focusing and long-distance propagation. Frequency comb lasers combine the above qualities in addition to a broad spectrum of precisely defined optical lines (the "comb") that can be absolutely referenced to radio frequencies (RF) or atomic frequency standards 1-3 . This has led to a variety of new spectroscopic advances 4-13 .While frequency combs were initially developed for the visible and near-infrared spectral regions, more recent research has focused on extending their coverage to the mid-infrared (mid-IR) 14 . This spectral region is of great interest because it is where many molecules including greenhouse gases, poisonous agents, explosives, and organics show distinctive ro-vibrational absorption fingerprints 14 . The development of a practical, broadband, and low-noise mid-IR frequency comb with moderate power could dramatically improve frequency precision, sensitivity, and data acquisition rates compared to conventional techniques such as Fourier-

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Section: Waveguide Geometries and Dispersion Profilesmentioning

confidence: 99%

Versatile silicon-waveguide supercontinuum for coherent mid-infrared spectroscopy

et al. 2018

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“…Subsequent to fission, the solitons transfer some of their energy to dispersive waves (DW) propagating in the normal dispersion regime according to a phase matching condition [24]. DW generation (also known as fiber-optic Cherenkov radiation), the phenomenon responsible for generating the short-wavelength radiation in this case, has been thoroughly studied in the past [25], [26]. The supercontinuum bandwidth is dependent on the pump detuning from the ZDW, so typically one can achieve larger blue shifts in constant-diameter PCFs by using smaller core sizes, but at the expense of a spectral gap opening up between the pump and DW radiation [23].…”

Section: Tapered Fiber Designmentioning

confidence: 99%

Visible-Spanning Flat Supercontinuum for Astronomical Applications

Ravi

Beck²,

Phillips

et al. 2018

J. Lightwave Technol.

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We demonstrate a broad, flat, visible supercontinuum spectrum that is generated by a dispersion-engineered tapered photonic crystal fiber pumped by a 1 GHz repetition rate turn-key Ti:sapphire laser outputting ∼ 30 fs pulses at 800 nm. At a pulse energy of 100 pJ, we obtain an output spectrum ,that is flat to within 3 dB over the range 490-690 nm with a blue tail extending below 450 nm. The mode-locked laser combined with the photonic crystal fiber forms a simple visible frequency comb system that is extremely well-suited to the precise calibration of astrophysical spectrographs, among other applications.

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“…[36], also by the Kärtner group, the FOCR generation in the few-cycle regime has been studied both theoretically and experimentally. In this work, three characteristic propagation scales were identified: 1) an initial buildup stage in which FOCR acquires most (>90%) of its energy; 2) quasi-independent propagation of FOCR with minimal interaction with its host soliton; and 3) strong interaction with the host soliton that is decelerated by stimulated Raman scattering (SRS).…”

Section: Current Progress In Fiber-optic Cherenkov Radiationmentioning

confidence: 99%

Progress in Cherenkov femtosecond fiber lasers

Liu

Svane

Lægsgaard

et al. 2015

J. Phys. D: Appl. Phys.

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We review the recent developments in the field of ultrafast Cherenkov fiber lasers. Two essential properties of such laser systems – broad wavelength tunability and high efficiency of Cherenkov radiation wavelength conversion are discussed. The exceptional performance of the Cherenkov fiber laser systems are highlighted - dependent on the realization scheme, the Cherenkov lasers can generate the femtosecond output tunable across the entire visible and even the UV range, and for certain designs more than 40 % conversion efficiency from the pump to Cherenkov signal can be achieved. The femtosecond Cherenkov laser with all-fiber architecture is presented and discussed. Operating in the visible range, it delivers 100–200 fs wavelength-tunable pulses with multimilliwatt output power and exceptionally low noise figure an order of magnitude lower than the traditional wavelength tunable supercontinuum-based femtosecond sources. The applications for Cherenkov laser systems in practical biophotonics and biomedical applications, such as bio-imaging and microscopy, are discussed.

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Fiber-optic Cherenkov radiation in the few-cycle regime

Cited by 46 publications

References 38 publications

Versatile silicon-waveguide supercontinuum for coherent mid-infrared spectroscopy

Versatile silicon-waveguide supercontinuum for coherent mid-infrared spectroscopy

Visible-Spanning Flat Supercontinuum for Astronomical Applications

Progress in Cherenkov femtosecond fiber lasers

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