The multimode and depolarized output beam of a highly multimode diode-pumped Yb-doped fiber amplifier is converted to a diffraction-limited, linearly polarized beam by a self-referencing two-wave-mixing process in an infrared-sensitive photorefractive crystal (Rh:BaTiO3). As much as 11.6 W of single-mode output is achieved with a 78% multimode-to-single-mode photorefractive conversion efficiency.

We show that optically-induced photorefractive space-charge fields can remove 180° ferroelectric domains in rhodium-doped barium titanate. The cross section of the domains must be small (less than 100 microns) for this process to occur. ©2000 Optical Society of America OCIS codes: (190.5330) Photorefractive nonlinear optics; (160.2260) Ferroelectrics; (160.5320) Photorefractive materials. _____...

1. Majmudar PA, Raviv T, Dennis RF, Epstein RJ. Subepithelial fibrosis after RK. J Cataract Refract Surg. 2000;26:1433-1434. 2. Fong YC, Chuck RS, Stark WJ, McDonnell PJ. Phototherapeutic keratectomy for superficial corneal fibrosis after radial keratotomy. J Cataract Refract Surg. 2000;26:616-619. 3. Majmudar PA, Forstot SL, Dennis RF, et al. Topical mitomycin-C for subepithelial fibrosis afte...

1. Majmudar PA, Raviv T, Dennis RF, Epstein RJ. Subepithelial fibrosis after RK. J Cataract Refract Surg. 2000;26:1433-1434. 2. Fong YC, Chuck RS, Stark WJ, McDonnell PJ. Phototherapeutic keratectomy for superficial corneal fibrosis after radial keratotomy. J Cataract Refract Surg. 2000;26:616-619. 3. Majmudar PA, Forstot SL, Dennis RF, et al. Topical mitomycin-C for subepithelial fibrosis afte...

This is a case report about the anterior segment findings of epithelial ingrowth in a young female patient after penetrating trauma. The patient underwent multiple surgeries after penetrating trauma and epithelial ingrowth was noted on regular follow-up. Epithelial ingrowth was noted along the inner surface of corneal endothelium along with the presence of cysts. These findings suggest that epi...

We incorporate a mixture of polystyrene (PS) and the highly conductive N,N′-diphenyl-N,N′-bis(3-methylphenyl)-[1,1′-biphenyl]4,4′-diamine (TPD) as charge transporting agent into a photorefractive composite, wherein the liquid crystal 4-cyano-4-n-pentylbiphenyl (5CB) is the electro-optical unit and the perylene bisimide dimer DiPBI acts as sensitizing component. Investigation of the photocurrent...

The decay of holograms stored in photorefractive polymer composites based on poly~N-vinyl-carbazole! with and without extrinsic deep traps is investigated. The photorefractive phase shift is identified as one of the key parameters determining the dark decay dynamics. This has important implications for all kinds of photorefractive imaging applications including holographic data storage. A trade...

We report measurements of the photorefractive phase shift and coupling constant of several photorefractive materials. We solve the problem of beam coupling and diffraction in a material with a dynamically written grating for arbitrary input beams. These solutions are used to determine the beam coupling as a function of the photorefractive phase ø and coupling constant g when one beam is either ...

We propose a technique to simultaneously stabilize relative wavelengths among multiple diode lasers by using multiplexed photorefractive gratings. Each grating is designed to be Bragg matched for the counter-propagating reflection at a specific diode laser wavelength. Experimental results from stabilization of two diode laser wavelengths by using two photorefractive gratings exhibit excellent s...

AIMS To determine the effect of intact corneal epithelium on stromal haze and myofibroblast cell formation after excimer laser surgery. METHODS Denuded epithelium alone, photorefractive keratectomy (PRK), laser in situ keratomileusis (LASIK), or LASIK with denuded epithelium was performed in rabbit eyes. Postoperative anterior stromal haze was assessed employing a standard scale. Immunohistoc...