Intensity averaging and four-wave mixing in Raman amplifiers

Goldhar, J.; Murray, J. R.

doi:10.1109/jqe.1982.1071540

Cited by 43 publications

(5 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Although the models would become quite complex, Raman scattering could be incorporated directly, rather than treated as a perturbation. In such a model, the interplay of linear mode-coupling (which distributes energy uniformly among modes) and Raman scattering could result in energy being 'siphoned' into the fundamental mode of the fibre [35][36][37] . The occurrence of this process would be noteworthy in its own right.…”

Section: Discussionmentioning

confidence: 99%

Optical solitons in graded-index multimode fibres

2013

View full text Add to dashboard Cite

Solitons are non-dispersing localized waves that occur in diverse physical settings, including liquids, optical fibres, plasmas and condensed matter. They attract interest owing to their particle-like nature and are useful for applications such as in telecommunications. A variety of optical solitons have been observed, but versions that involve both spatial and temporal degrees of freedom are rare. Optical fibres designed to support multiple transverse modes offer opportunities to study wave propagation in a setting that is intermediate between single-mode fibre and free-space propagation. Here we report the observation of optical solitons and soliton self-frequency shifting in graded-index multimode fibre. These wave packets can be modelled as multicomponent solitons, or as solitons of the Gross-Pitaevskii equation. Solitons in graded-index fibres should enable increased data rates in low-cost telecommunications systems, are pertinent to space-division multiplexing, and can offer a new route to mode-area scaling for high-power lasers and transmission.

show abstract

Section: Discussionmentioning

confidence: 99%

Optical solitons in graded-index multimode fibres

2013

View full text Add to dashboard Cite

show abstract

“…This intensity depends on the correlation function C(t, 1/, t") = (IEL(t)I 2 EL(t')Es*(t')EL*(t//)Es(t1)). (4) As was stated at the beginning of this Letter, the generated Stokes field amplitude ES(t) approximately follows the laser field amplitude EL(t) in the case of a laser linewidth much larger than a Raman linewidth. The quantum theory of the Stokes generator shows that the Stokes field entering Cell(2) is related to the laser field in the high-gain limit by…”

mentioning

confidence: 60%

Phase cross correlation in the coherent Raman process

Radzewicz

Raymer

1988

Opt. Lett.

View full text Add to dashboard Cite

The coherent anti-Stokes Raman scattering (CARS) process with two different-color phase-fluctuating fields was studied experimentally and theoretically. It was found that the efficiency of this process depends strongly on the cross correlation between the phases of the driving fields. Depending on the detuning from Raman resonance, the CARS signal can be either enhanced or suppressed with respect to the case of uncorrelated fields.

show abstract

“…For fields of linewidth greater than the Raman linewidth, it remains only at the level of a monochromatic pump beam if phase fluctuations in the fields are fully correlated during the interaction. Further complications arise when using multiple non‐collinear input beams due to the resulting interference patterns (gain gratings ) and due to phase‐matched four wave mixing (FWM) processes . These effects, which depend sensitively on beam crossing angles, may lead to energy loss through off‐axis beam generation or degrade the Stokes beam quality.…”

Section: Methodsmentioning

confidence: 99%

“…For maximum conversion efficiency, it is important to avoid parametric generation of high‐order Stokes and anti‐Stokes frequencies when using angled beams , as well as certain propagation angles for which phase‐matched four wave mixing (FWM) prevails between pump and Stokes fields . FWM generates additional beams that spread power amongst angularly displaced anti‐Stokes and higher order‐Stokes lines.…”

Section: Methodsmentioning

confidence: 99%

Diamond‐based concept for combining beams at very high average powers

McKay

Spence

Coutts

et al. 2017

Laser & Photonics Reviews

View full text Add to dashboard Cite

Ever since the laser's invention, there has been great interest in increasing beam output power without detriment to its coherence. Despite great advances having been obtained through the use of a diverse range of approaches, steady‐state beam powers above ten kilowatts remain a significant challenge for solid‐state lasers due to the heightened impact of detrimental nonlinear effects such as thermal lensing. Multiplexing several lasers using beam combination represents a method for surpassing the power barriers of single lasers. Here we propose and demonstrate a novel approach to beam combination and power scaling based on Raman conversion in diamond. Power from multiple non‐collinear pump beams is efficiently transferred onto a single Stokes beam in a single‐pass amplifier. Using three mutually‐independent nanosecond pulsed beams from a free‐running‐linewidth 1064 nm laser, 69% of the total peak pump power of 6.7 kW was transferred onto a TEM00 Stokes seed pulse at 1240 nm in a 9.5 mm long diamond crystal. Compared to other beam combination techniques, diamond beam combination has advantages of relaxed constraints on pump beam mutual coherence, while enabling narrowband output. Thermal considerations for extending from low duty‐cycle to continuous wave operation and higher power levels are discussed.

show abstract

Intensity averaging and four-wave mixing in Raman amplifiers

Cited by 43 publications

References 17 publications

Optical solitons in graded-index multimode fibres

Optical solitons in graded-index multimode fibres

Phase cross correlation in the coherent Raman process

Diamond‐based concept for combining beams at very high average powers

Contact Info

Product

Resources

About