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95 results on '"Fang, F. Z."'

1. Squeezed light from a diamond-turned monolithic cavity

Author

Brieussel, A., Shen, Y., Campbell, G., Guccione, G., Janousek, J., Hage, B., Buchler, B. C., Treps, N., Fabre, C., Fang, F. Z., Li, X. Y., Symul, T., and Lam, P. K.

Subjects
Physics - Optics, Quantum Physics
Abstract

For some crystalline materials, a regime can be found where continuous ductile cutting is feasible. Using precision diamond turning, such materials can be cut into complex optical components with high surface quality and form accuracy. In this work we use diamond-turning to machine a monolithic, square-shaped, doubly-resonant $LiNbO_3$ cavity with two flat and two convex facets. When additional mild polishing is implemented, the Q-factor of the resonator is found to be limited only by the material absorption loss. We show how our monolithic square resonator may be operated as an optical parametric oscillator that is evanescently coupled to free-space beams via birefringent prisms. The prism arrangement allows for independent and large tuning of the fundamental and second harmonic coupling rates. We measure $2.6\pm0.5$ dB of vacuum squeezing at 1064 nm using our system. Potential improvements to obtain higher degrees of squeezing are discussed., Comment: 15 pages, 10 figures

Published
2016
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18. Squeezed light from a diamond-turned monolithic cavity

Author

Brieussel, A., primary, Shen, Y., additional, Campbell, G., additional, Guccione, G., additional, Janousek, J., additional, Hage, B., additional, Buchler, B. C., additional, Treps, N., additional, Fabre, C., additional, Fang, F. Z., additional, Li, X. Y., additional, Symul, T., additional, and Lam, P. K., additional

Published
2016
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19. A comparative investigation on hybrid EDM for drilling small deep holes.

Author

Hao Ni, Hu Gong, Dong, Y. H., Fang, F. Z., and Yi Wang

Subjects
DRILLING fluids, ELECTRIC metal-cutting, MATHEMATICAL combinations, MECHANICAL behavior of materials, VIBRATION (Mechanics)
Abstract

For the use of electrical discharge machining (EDM) to drill small, deep holes, many studies have shown that tool electrode vibration and rotation and pump forced flushing can improve machining efficiency or quality. However, these factors are usually studied separately. In this study, a hybrid, rotary, ultrasonic EDMsystem was developed that used these three methods simultaneously. A comparative investigation on different combinations of the three methods was conducted for drilling small, deep holes in Inconel 718 and 41Cr4 workpieces. Results showed that, compared with other combinations for precision drilling under low discharge currents, combinations including these three methods simultaneously achieved more stable machining and higher material removal rates. In addition, the applied current greatly influenced hole depth and the effects of ultrasonics. When a high discharge current was applied, the electrode vibration contribution appeared weak. [ABSTRACT FROM AUTHOR]

Published
2018
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42. Generation of spherical non-uniform rational basis spline curves and its application in five-axis machining.

Author

Huang, Kun-Tao, Gong, Hu, Fang, F. Z., and Li, Z. J.

Abstract

A method of generating spherical non-uniform rational basis spline curves based on De Boor’s algorithm is presented in this article. The spherical curve preserves many good properties from non-uniform rational basis spline curves in Euclidean space, such as local modification property, convex hull property, rotation invariant property, knot insertion property, and so on. Construction of closed spherical non-uniform rational basis spline curve will be discussed too. Furthermore, a progressive iterative approximation scheme is proposed to approximate the given points on unit sphere using spherical non-uniform rational basis spline curves. The convergence and curve continuity will be discussed. Since the analytical expression of the spherical non-uniform rational basis spline curve is messy, numerical differentiation is used to test its continuity at interior knots. Finally, several examples are presented to verify the effectiveness of the proposed method. The proposed method is applied on tool path generation of five-axis machining to avoid interference by adjusting fewer directions and obtain smooth tool path simultaneously. [ABSTRACT FROM AUTHOR]

Published
2015
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43. Nano machining mechanism and methods for generating complex surfaces.

Author

Fang, F. Z. and Zhang, X. D.

Subjects
*NANOFABRICATION, *OPTICAL properties of surfaces, *MACHINING, *LIGHT transmission, *NANOMANUFACTURING, *OPTICAL reflection, *MANUFACTURING processes
Abstract

The article discusses nano machining and research regarding various methods for generating complex optical surfaces. According to the article, complex optical surfaces can be used to improve light transmission, reflection, and image quality. Single-point diamond tools and post-production processes such as grinding, lapping, and polishing are mentioned. The Centre of MicroNano Manufacturing Technology at Tianjin University in China is also examined.

Published
2014

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