Spectral red-shifting of multi-frequency Raman orders

Cui, Zheng; Chaturvedi, Manoj Kumar; Tian, Bingxin; Ackert, Jason J.; Strickland, D.

doi:10.1016/j.optcom.2012.09.081

Cited by 7 publications

(10 citation statements)

References 8 publications

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“…The experimental MRG system is the same as previously described [8]. We contain the nonlinear medium in a hollow fiber to extend the nonlinear region, guide the beams and provide phase matching.…”

Section: Methodsmentioning

confidence: 99%

“…To avoid SPM, the short pulses are lengthened by linearly frequency chirping the pulses. We have previously observed that, when using linearly chirped pump pulses, extra peaks appear in the MRG spectrum of sulfur hexafluouride (SF 6 ) [7,8]. These peaks appear on the lower frequency side of the Raman peaks.…”

Section: Introductionmentioning

confidence: 99%

“…In order to determine if these red-shifted shoulders were simply the result of four-wave mixing, we have measured the MRG spectra as a function of tuning the instantaneous frequency separation [8]. We showed that the red shifted peaks shift further to the red as the instantaneous frequency separation of the two pump beams is reduced below the Raman frequency until the red-shift saturates.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Two-Photon Stark Shift on the Multi-Frequency Raman Spectra

Yan

Strickland

2014

Applied Sciences

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High order Raman generation has received considerable attention as a possible method for generating ultrashort pulses. A large number of Raman orders can be generated when the Raman-active medium is pumped by two laser pulses that have a frequency separation equal to the Raman transition frequency. High order Raman generation has been studied in the different temporal regimes, namely: adiabatic, where the pump pulses are much longer than the coherence time of the transition; transient, where the pulse duration is comparable to the coherence time; and impulsive, where the bandwidth of the ultrashort pulse is wider than the transition frequency. To date, almost all of the work has been concerned with generating as broad a spectrum as possible, but we are interested in studying the spectra of the individual orders when pumped in the transient regime.We concentrate on looking at extra peaks that are generated when the Raman medium is pumped with linearly chirped pulses. The extra peaks are generated on the low frequency side of the Raman orders. We discuss how linear Raman scattering from two-photon dressed states can lead to the generation of these extra peaks.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Two-Photon Stark Shift on the Multi-Frequency Raman Spectra

Yan

Strickland

2014

Applied Sciences

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“…The generation of multicolor laser emission via FWM has also been investigated in the femtosecond (fs) regime [8][9][10][11][12][13][14][15][16][17][18][19][20][21]. Resonant and non-resonant FWM has been investigated in bulk media [11,13,[15][16][17], leading to multicolor laser emission with a pulse energy of about 1 microjoule [17].…”

Section: Introductionmentioning

confidence: 99%

“…The efficiency of the multicolor generation can be improved by more than one order of magnitude using gaseous media rather than bulk media. In addition, the spectral range from the DUV to the NIR has been covered by employing Raman active gases as the nonlinear media for FWM [9,10,12,14,20,21]. When pumping with short fs pulses with high intensities, self-phase modulation (SPM) and cross-phase modulation (XPM) are simultaneously induced, which results in a broad spectral width for each multicolor emission.…”

Section: Introductionmentioning

confidence: 99%

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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From Raman Frequency Combs to Supercontinuum Generation in Nitrogen‐Filled Hollow‐Core Anti‐Resonant Fiber

Gao

Belli

Brahms

et al. 2022

Laser & Photonics Reviews

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A route to supercontinuum generation in gas-filled hollow-core anti-resonant fibers is demonstrated through the creation of a broad vibrational Raman frequency comb followed by continuous broadening and merging of the comb lines through either rotational Raman scattering or the optical Kerr effect. The demonstration experiments, utilizing a single pump pulse with 20 ps duration at 532 nm in a nitrogen-filled fiber, produce a supercontinuum spanning from 440 to 1200 nm, with an additional deep ultraviolet continuum from 250 to 360 nm. Numerical results suggest that this approach can produce even broader supercontinuum spectra extending from the ultraviolet to mid-infrared.

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Spectral red-shifting of multi-frequency Raman orders

Cited by 7 publications

References 8 publications

Effect of Two-Photon Stark Shift on the Multi-Frequency Raman Spectra

Effect of Two-Photon Stark Shift on the Multi-Frequency Raman Spectra

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

From Raman Frequency Combs to Supercontinuum Generation in Nitrogen‐Filled Hollow‐Core Anti‐Resonant Fiber

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