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American Journal of Applied Sciences

Demonstration of Optical Phase-conjugation in Methyl Green Dye-doped Thin Film

T. Geethakris, P. K. Palanisamy

Published Aug 1, 2005• 6 citations
Publisher

Abstract

Optical Phase-Conjugation (OPC) has been observed in Methyl Green (MG) dye sensitized gelatin films in Degenerate Four-Wave Mixing (DFWM) configuration at 633 nm radiation from a He-Ne laser of total power 35 mW.The mechanism of Phase-Conjugate (PC) wave generation associated with this dye-doped system was discussed.The dependence of the PC wave generation on the incident angle between the forward-pump and the probe beams and time of evolution were also studied.A maximum phase-conjugate beam reflectivity of about 0.13% has been observed in this dye-doped gelatin films.

DOI
10.3844/ajassp.2005.1228.1231

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Applied Optics•Aug 20, 1992•12 citations
Optical Phase-Conjugation (OPC) has been observed in Methyl Green (MG) dye sensitized gelatin films in Degenerate Four-Wave Mixing (DFWM) configuration at 633 nm radiation from a He-Ne laser of total power 35 mW.The mechanism of Phase-Conjugate (PC) wave generation associated with this dye-doped system was discussed.The dependence of the PC wave generation on the incident angle between the forward-pump and the probe beams and time of evolution were also studied.A maximum phase-conjugate beam reflectivity of about 0.13% has been observed in this dye-doped gelatin films.
Optical phase-conjugation (OPC) was observed in Acid blue 9 dye-doped gelatin via degenerate four-wave mixing (DFWM) using a low-power He-Ne laser at 633 nm. Phase-conjugate (PC) signal measurements were made by varying the angle of incidence between the forward-pump beam and the probe beam in the degenerate four-wave mixing geometry. Growth of phase-conjugate signal with respect to the recording time was also measured. Finally double-exposure phase-conjugate interferometry was demonstrated in these dye doped gelatin films.
We present optical phase conjugation based on the degenerate four‐wave mixing (DFWM) arrangement in gelatin films doped with acid blue 3 dye (FAST GREEN FCF) using He‐Ne laser of total power 50 mW. Various parameters which influence the phase‐conjugate (PC) signal during the DFWM process were studied (angle of between the forward pump and the probe beam, transition of gelatin film, reflectivity as a function of forward and backward beam). A maximum phase‐conjugate beam reflectivity of about 0.02% has been observed in these dye‐doped gelatin films. PACS: 42.65.‐k, 42.65.Hw.
We report on the observation of optical phase-conjugation (OPC) in Acid blue 9 dye-doped gelatin film using a low-power continuous-wave (He–Ne, 633 nm, 35 mW) laser by the degenerate four-wave mixing (DFWM) method. The intensity of the phase-conjugate signal was measured as a function of time of exposure. The phase-conjugate signal contributions from induced transmission and reflection gratings were measured. The fringe spacing (Λ) of the transmission and reflection gratings formed in the Acid blue 9 dye film were calculated as 5.12 and 0.32 µm respectively.
Optical phase conjugation through degenerate four-wave mixing is observed in 4-[4-(Dimethylamino)styryl]-1-docosyl pyridinium bromide (DASPB) dye-doped in Polymethyl methacrylate - metacrylic acid (PMMA-PA) polymer films under low-power, continuous-wave laser irradiation. A maximum phase conjugate efficiency of 0.42% has been obtained for probe beam intensity at 2.5 W/cm2. Phase conjugation is observed for both parallel- and orthogonally-polarized probe and pump beams. The maximum PC reflectivity is achieved when the angle between probe beam and forward pump beam is 8 degrees. The effects of dye concentration, inter beam angle between probe and forward pump beam on phase conjugation reflectivity are also studied. PC signal strength first increases and then decreases with time. PC reflectivity is also increased by increasing the intensity of the backward and forward pump beam. The polarization and intensity profile are verified to be preserved in the conjugate signal. The predominant phase conjugation signal is attributed due to the saturable absorption and two photon induced fluorescence property of the dye molecules.
With a conventional degenerate four-wave mixing (um) configuration, the gelatin film containing fluorescein, erythrosin or eosin produces the phase conjugate CPC1 wave by not only the DFWM process but also the holographic process at the intensity of lower than 0.5 w/cm2 of light emitted by a cw Arion laser1). The holographic process differs from the DFWMprocess in the respect that light incident on a dye-doped film induces permanent photochemical changes in the absorption and/or the refractive index. The distinction between the two process is more clearly brought out in the response time of the PC wave by each process: the DFWM component with a fast response time of the order of milliseconds and the holographic component with a slow response time of the order of minutes2),3) Our aim is to demonstrate that a gelatin film containing methylreds can generate the PC wave only by the DFWM process, but a PMMA film containing methylreds can generate the PC waves by the DFWM and holographic processes.
Optical phase conjugation in methylene blue sensitized gelatin film has been obtained with 514.5-nm radiation from an argon-ion laser with power levels as low as 50 mW/cm(2) for the pump beam in a degenerate four-wavemixing configuration. The film with a thickness of 110-120 microm prepared from a solution of a 1.8-mmol concentration of methylene blue sensitized gelatin shows a good phase-conjugate reflectivity of 0.5% for this power level at 514.5 nm, which is well away from its absorption peak at ~ 650 nm.