Optical amplification in the near-infrared in gas-filled hollow-core fibers

Faccio, Daniele; Grün, Alexander; Bates, Philip K.; Chalus, Olivier; Biegert, J.

doi:10.1364/ol.34.002918

Cited by 27 publications

(35 citation statements)

References 11 publications

(10 reference statements)

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“…For the gas-filled hollow fiber, it should be necessary to take into account the contributions from high-order propagation modes. For several combinations of high-order propagation modes, the gas pressure at which phase matching is satisfied becomes higher than the phase-matching gas pressure for the lowest-order propagation modes [29][30][31][32].…”

Section: Phase Mismatch In the Generation Of High-order Anti-stokes Ementioning

confidence: 95%

High-Energy, Multicolor Femtosecond Pulses from the Deep Ultraviolet to the Near Infrared Generated in a Hydrogen-Filled Gas Cell and Hollow Fiber

2014

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Abstract:We investigate four-wave mixing in hydrogen gas using a gas cell and a hollow fiber for the generation of high-energy, multicolor femtosecond (fs) optical pulses. Both a hydrogen-filled gas cell and hollow fiber lead to the generation of multicolor fs pulses in a broad spectral range from the deep ultraviolet to the near infrared. However, there is a difference in the energy distribution of the multicolor emission between the gas cell and the hollow fiber. The hydrogen-filled gas cell generates visible pulses with higher energies than the pulses created by the hollow fiber. We have generated visible pulses with energies of several tens of microjoules. The hydrogen-filled hollow fiber, on the other hand, generates ultraviolet pulses with energies of a few microjoules, which are higher than the energies of the ultraviolet pulses generated in the gas cell. In both schemes, the spectral width of each emission line supports a transform-limited pulse duration shorter than 15 fs. Four-wave mixing in hydrogen gas therefore can be used for the development of a light source that emits sub-20 fs multicolor pulses in a wavelength region from the deep ultraviolet to the near infrared with microjoule pulse energies.

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Section: Phase Mismatch In the Generation Of High-order Anti-stokes Ementioning

confidence: 95%

High-Energy, Multicolor Femtosecond Pulses from the Deep Ultraviolet to the Near Infrared Generated in a Hydrogen-Filled Gas Cell and Hollow Fiber

2014

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“…This effect is also well known in the normal GVD regime in both bulk and large diameter hollow core fibers used for high energy (mJ or higher) pulse compression (see e.g. [10][11][12]). Conversely, spectral red-shifting is typically not observed in positive GVD: in solid core fibers the pulse will usually temporally broaden and thus reduce the peak intensity before efficient red-shifting can take place.…”

Section: Introductionmentioning

confidence: 62%

Spectral broadening and temporal compression of ∼100 fs pulses in air-filled hollow core capillary fibers

Li¹,

Rishad²,

Horák³

et al. 2014

Opt. Express

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Abstract:We experimentally study the spectral broadening of intense, ∼100 femtosecond laser pulses at 785 nm coupled into different kinds of hollow core capillary fibers, all filled with air at ambient pressure. Differently from observations in other gases, the spectra are broadened with a strong red-shift due to highly efficient intrapulse Raman scattering. Numerical simulations show that such spectra can be explained only by increasing the Raman fraction of the third order nonlinearity close to 100%. Experimentally, these broadened and red-shifted pulses do not generally allow for straightforward compression using, for example, standard chirped mirrors. However, using special hollow fibers that are internally coated with silver and polymer we obtain pulse durations in the sub-20 fs regime with energies up to 300 µJ.

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“…Contrary to the amplification by stimulated Raman scattering, the amplification of light in the present research relies on the nonresonant FWM [10,11] that originates from the instantaneous response of the bound electrons rather than the nuclear response. The FWOPA poses no limitation on the frequency separation between the two input pulses, pump and signal pulses, except that the signal frequency must be lower than twice the pump frequency.…”

Section: Excitation Of Rotational Wavepackets By the Pump Pulse And Tmentioning

confidence: 98%

“…The parametric amplification based on third-order nonlinearity, nonresonant four-wave optical parametric amplification (FWOPA), also amplifies light in a broad spectral range [8][9][10][11]. An amplification gain as high as 100 has been reached in bulk media such as water and glasses [8,9].…”

Section: Open Accessmentioning

confidence: 99%

“…During the interaction of the FWM, the signal pulse is parametrically amplified by the energy transfer from the pump pulse to the signal pulse [8][9][10][11]. In addition, the pump pulse induces nonlinear refractive index in the medium, which in the case of a Raman-inactive medium like a noble gas, originates from the instantaneous response of the bound electrons.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

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Four-Wave Optical Parametric Amplification in a Raman-Active Gas

Kida

Imasaka

2015

Photonics

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Four-wave optical parametric amplification (FWOPA) in a Raman-active medium is experimentally investigated by use of an air-filled hollow fiber. A femtosecond pump pulse shorter than the period of molecular motion excites the coherent molecular motion of the Raman-active molecules during the parametric amplification of a signal pulse. The excited coherent motion modulates the frequency of the signal pulse during the parametric amplification, and shifts it to lower frequencies. The magnitude of the frequency redshift depends on the pump intensity, resulting in intensity-dependent spectral characteristics that are different from those in the FWOPA induced in a noble-gas-filled hollow fiber.

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Optical amplification in the near-infrared in gas-filled hollow-core fibers

Cited by 27 publications

References 11 publications

High-Energy, Multicolor Femtosecond Pulses from the Deep Ultraviolet to the Near Infrared Generated in a Hydrogen-Filled Gas Cell and Hollow Fiber

High-Energy, Multicolor Femtosecond Pulses from the Deep Ultraviolet to the Near Infrared Generated in a Hydrogen-Filled Gas Cell and Hollow Fiber

Spectral broadening and temporal compression of ∼100 fs pulses in air-filled hollow core capillary fibers

Four-Wave Optical Parametric Amplification in a Raman-Active Gas

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