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Your search keyword '"Serpenguezel, Ali"' showing total 11 results
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11 results on '"Serpenguezel, Ali"'

1. Laser-Inscribed Diamond Waveguide Resonantly Coupled to Diamond Microsphere

Author

Yavuz, Nurperi, Bayer, Mustafa Mert, Cirkinoğlu, Hüseyin Ozan, Serpengüzel, Ali, Phu, Thien Le, Giakoumaki, Argyro, Bharadwaj, Vibhav, Ramponi, Roberta, and Eaton, Shane M.

Subjects
Physics - Optics, Physics - Applied Physics
Abstract

An all-diamond photonic circuit was implemented by integrating a diamond microsphere with a femtosecond-laser-written bulk diamond waveguide. The near surface waveguide was fabricated by exploiting the Type II fabrication method to achieve stress-induced waveguiding. Transverse electrically and transverse magnetically polarized light from a tunable laser operating in the near-infrared region was injected into the diamond waveguide, which when coupled to the diamond microsphere showed whispering-gallery modes with a spacing of 0.33 nm and high-quality factors of 105. By carefully engineering these high-quality factor resonances, and further exploiting the properties of existing nitrogen-vacancy centers in diamond microspheres and diamond waveguides in such configurations, it should be possible to realize filtering, sensing and nonlinear optical applications in integrated diamond photonics.

Published
2020
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5. Modification and dynamics inside diamond by femtosecond laser double-pulse irradiation

Author

Okada Takuro, Serpenguezel Ali, Sakakura Masaaki, Sotillo Belen, Shimotsuma Yasuhiko, Ramponi Roberta, Miura Kiyotaka, Bharadwaj Vibhav, S Goekay Ulas, and M Eaton Shane

Subjects
Materials science, business.industry, Dynamics (mechanics), Diamond, engineering.material, Laser, Industrial and Manufacturing Engineering, Double pulse, law.invention, Optics, law, Femtosecond, engineering, Irradiation, Electrical and Electronic Engineering, business, Instrumentation
Abstract

We investigated modifications and the temporal evolution of the morphology in the photoexcited region inside diamond single crystal after photoexcitation by tightly focused fs laser pulses. We found that double-pulse irradiation with 200-400 fs laser pulses was able to induce a permanent modification in the photoexcited region, while single-pulse irradiation with 100-300 fs laser pulses was not. The modification by double-pulse irradiation became larger for a longer time-difference between the two pulses in the range from 1 ps to 10 ps. The morphology change observed by a pump-probe optical microscope showed that the photoexcited region by double-pulse irradiation was smaller than by single-pulse irradiation, even for the same total pulse energy, with the ampli-tudes of the laser induced-stress waves being the same. This observation suggests that the photo-induced plasmas by double-pulse irradiation was localized in a smaller region than that by single-pulse irradiation, and the difference in plasma distribution could be the origin of the permanent modification.

Published
2016

10. Characteristics and Applications of Stimulated Raman Scattering in Microdroplets

Author

YALE UNIV NEW HAVEN CT DEPT OF APPLIED PHYSICS, Chang, Richard K., Serpenguezel, Ali, YALE UNIV NEW HAVEN CT DEPT OF APPLIED PHYSICS, Chang, Richard K., and Serpenguezel, Ali

Abstract

Review is made of the feedback and gain enhancement mechanisms unique to microdroplets. In particular, the growth of stimulated Raman scattering is considered in the presence of two-photon absorption as well as the usual optical losses inside the droplet because of scattering and leakage out of the droplet cavity.... Microparticles, stimulated Raman scattering, stimulated Brillouin scattering, and two-photon absorption.

Published
1993

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