Phase correlation in a Raman amplifier

Lombardi, Gabriel G.; Injeyan, Hagop

doi:10.1364/josab.3.001461

Cited by 11 publications

(3 citation statements)

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“…3 4 It has also been shown that a Raman amplifier can induce strong phase correlations between the fluctuating pump wave and the amplified Stokes wave in the absence of any such correlations at the input. 5 In the case of the Raman generator, where the Stokes light builds up from spontaneous scattering, it is known that when the pump is broadband the Stokes light is generated with the same bandwidth as the pump field and automatically has strong correlation to the pump fluctuations.> 8 -This is because the spontaneous noise field contains all phases, and the amplification process picks out the correlated part, which has the highest gain. Thus Stokes generation is a convenient way to produce a frequency-shifted field that is well correlated with the pump field.…”

Section: Introductionmentioning

confidence: 99%

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Cancellation of laser phase fluctuations in Stokes and anti-Stokes generation

Radzewicz

Raymer

1988

J. Opt. Soc. Am. B

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In the coherent anti-Stokes Raman scattering process, the spectrum of the generated optical phonon depends on the degree of temporal correlation between the pump laser field and the Stokes field. When the two fields are strongly correlated, such as when the Stokes field is generated with stimulated Raman scattering (SRS), the spectral shape of the optical phonon is found experimentally and theoretically to be the same as the gain-narrowed Raman line shape because the laser phase fluctuations cancel out totally, leaving only the collisional noise in the SRS process. When the two fields are uncorrelated, the shape of the optical-phonon spectrum is found to be the same as the Raman line shape without gain narrowing. When two fields are partially correlated, then the two spectral components appear together. We provide a method to measure the degree of correlation between two optical fields that have different central frequencies. The theory developed to interpret the experimental results is an extension of the quantum theory of SRS to include anti-Stokes scattering. We show that only in the high-gain limit can the quantum fluctuations be thought of as arising from a classical noise process.

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Section: Introductionmentioning

confidence: 99%

“…which is similar to Eq. (5) in the text. The quantity of interest is the spectrum of the anti-Stokes field, which is the Fourier transform of the normally ordered autocorrelation function (AS(-)(Z, t + T)PAS(+)(Z, t)).…”

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confidence: 99%

Cancellation of laser phase fluctuations in Stokes and anti-Stokes generation

Radzewicz

Raymer

1988

J. Opt. Soc. Am. B

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“…Since depletion of the laser field and amplification of the Stokes field are negligible, and the angle between the two beams is small, they depend only on the local time variable t = tlabz/c. 10 F is the collisional dephasing rate, and A = COL -COS -W21 is the Raman detuning, i.e., the mismatch between the difference of pump laser and Stokes frequencies and the molecular vibrational frequency 021 in Cell(2). K1 and K2 are coupling constants, and the phase mismatch, Ak = 2kL -ks -kAs, will be taken equal to zero.…”

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confidence: 99%

Phase cross correlation in the coherent Raman process

Radzewicz

Raymer

1988

Opt. Lett.

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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.

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