Competition between forward and backward stimulated Raman scattering and compression of picosecond pulses

Kachinskii, A. V.; Kotaev, G G; Pilipovich, I. V.

doi:10.1070/qe1992v022n06abeh003509

Cited by 4 publications

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“…The pulse duration of the backward first Stokes component at 416 nm was ¾50 ps which results from the predominance of the backward scattering over the forward scattering. 20 Picosecond Raman scattering was excited by a cylindrical lens f D 30 cm in a backscattering geometry and was dispersed by a double-grating 2 ð 1800 lines mm 1 monochromator. The spectral slit width was ¾5 cm 1 .…”

Section: Methodsmentioning

confidence: 99%

Mechanism of exciplex formation between Cu-porphyrin and calf-thymus DNA as revealed by saturation resonance Raman spectroscopy

Shvedko

Kruglik

Ermolenkov

et al. 1999

J. Raman Spectrosc.

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The excited-state complex (exciplex) formation that results from the photoinduced interaction of water-soluble cationic copper(II) 5,10,15,20-tetrakis[4-(N -methylpyridyl)]porphyrin [Cu(TMpy-P4)] with calf-thymus DNA has been studied in detail by resonance Raman (RR) spectroscopy using both ¾10 ns and ¾50 ps laser pulses. The obtained Raman saturation dependences were simulated using the rate equations approach on the basis of two different models. The first model was taken from the work of Strahan et al. and is based on the assumption of the preferential intercalation of Cu(TMpy-P4) at GC sites and includes the process of fast translocation of metalloporphyrin from GC sites into outside-bound AT sites under the action of a laser pulse. Another model was based on the assumption of binding of Cu(TMpy-P4) to both GC and AT sites of DNA and exciplex formation involving copper porphyrin initially located at AT sites.Our results show that: (i) the exciplex is formed during the action of a laser pulse, with both ¾10 ns and ¾50 ps duration; (ii) photoinduced accumulation of free Cu(TMpy-P4) molecules in a buffer solution and changes in the stationary distribution over metalloporphyrin binding modes do not take place under high-power irradiation; (iii) the mechanism of Cu(TMpy-P4) translocation is not sufficient for the explanation of the process of exciplex formation; (iv) further time-resolved studies are required to suggest a more elaborate mechanism for this process.

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Section: Methodsmentioning

confidence: 99%

Mechanism of exciplex formation between Cu-porphyrin and calf-thymus DNA as revealed by saturation resonance Raman spectroscopy

Shvedko

Kruglik

Ermolenkov

et al. 1999

J. Raman Spectrosc.

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“…Another important feature of SRS is the shortening of the Stokes pulse width from that of the input laser pulse. Pulse compression factors as high as 40 have been observed [6] in backward SRS [7][8][9][10][11][12]. Such a large compression is possible due to the fact that backscattered pulse continuously encounters an undepleted pump light giving rise to high amplification and sharpening.…”

Section: Introductionmentioning

confidence: 99%

Amplified spontaneous emission enhanced forward stimulated Raman scattering in dye solutions

Dharmadhikari

Mishra³

et al. 2003

Applied Physics B: Lasers and Optics

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We study forward stimulated Raman emission from weakly fluorescent dye 4'-diethylamino-N-methyl-4-stilbazolium tosylate (DEST) in 1,2,dichloroethane solution excited by a 28 ps, 532 nm Nd: YAG laser. Neat 1, 2, dichloroethane emits the first Stokes line at 631 nm with a spectral width of 1.6 nm corresponding to a Raman shift of 2956 cm -1 . We observe reduction of spectral width with the addition of DEST in 1, 2, dichloroethane solution. The single pass conversion efficiency for forward Raman emission is as high as 20% in a 1 cm path length sample. The pulse duration of forward stimulated Raman emission measured by a third order autocorrelation technique is 10 ps in neat 1, 2, dichloroethane, whereas it is ~3 ps for 4 x 10 -5 mol/l of DEST solution.

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Design of a compact blue-green stimulated hydrogen Raman shifter

1996

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Competition between forward and backward stimulated Raman scattering and compression of picosecond pulses

Cited by 4 publications

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Mechanism of exciplex formation between Cu-porphyrin and calf-thymus DNA as revealed by saturation resonance Raman spectroscopy

Mechanism of exciplex formation between Cu-porphyrin and calf-thymus DNA as revealed by saturation resonance Raman spectroscopy

Amplified spontaneous emission enhanced forward stimulated Raman scattering in dye solutions

Design of a compact blue-green stimulated hydrogen Raman shifter

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