Yu Benli

Imaging properties and measurement of Selfoc lens and SLA

Selfoc lens is a special type of optical fiber. It is used as an image lens or for optical coupling, etc. Thus it is an important component in optical communication and integrated optics. A SLA (Selfoc lens array) is composed of many Selfoc lens in a strict manner. It is now extensively used in copying machines, fax system and printers. We obtain lithium doped Selfoc lenses and SLA by ion exchange processes. We evaluate the parameters and analyze the imaging characteristic of a Selfoc lens and SLA. The optical parameters measurement system is constructed. This system can measure geometric parameters and optical parameters, such as Selfoc lens diameter, conjugate length, imaging width of SLA and MTF, etc.<<ETX>>

Adaptive optics based non-null interferometry for optical free form surfaces test

An adaptive optics based non-null interferometry (ANI) is proposed for optical free form surfaces testing, in which an open-loop deformable mirror (DM) is employed as a reflective compensator, to compensate various low-order aberrations flexibly. The residual wavefront aberration is treated by the multi-configuration ray tracing (MCRT) algorithm. The MCRT algorithm based on the simultaneous ray tracing for multiple system models, in which each model has different DM surface deformation. With the MCRT algorithm, the final figure error can be extracted together with the surface misalignment aberration correction after the initial system calibration. The flexible test for free form surface is achieved with high accuracy, without auxiliary device for DM deformation monitoring. Experiments proving the feasibility, repeatability and high accuracy of the ANI were carried out to test a bi-conic surface and a paraboloidal surface, with a high stable ALPAOTM DM88. The accuracy of the final test result of the paraboloidal surface was better than 1/20 Μ PV value. It is a successful attempt in research of flexible optical free form surface metrology and would have enormous potential in future application with the development of the DM technology.

Two-dimensional atom localization via probe absorption in a four-level atomic system

We have investigated the two-dimensional (2D) atom localization via probe absorption in a coherently driven four-level atomic system by means of a radio-frequency field driving a hyperfine transition. It is found that the detecting probability and precision of 2D atom localization can be significantly improved via adjusting the system parameters. As a result, our scheme may be helpful in laser cooling or the atom nano-lithography via atom localization.

Scheme for Implementing Refined Deutsch–Jozsa Algorithm via Superconducing Qubits

We propose a scheme of implementing the Deutsch–Jozsa algorithm based on superconducing charge qubits, which would be a key step to scale more complex quantum algorithms and very important for constructing a real quantum computer via superconducting charge qubits. The present scheme is simple but fairly efficient, and easily manipulated because arbitrary two-qubit can be selectively and effectively coupled by a common inductance. More manipulations can be carried out before decoherence sets in. The proposed scheme is in line with current technology.