Measuring optical vortices in a speckle pattern using a multi-pinhole interferometer.
نویسندگان
چکیده
We show that it is possible to find and characterise optical vortices in a speckle pattern using a multi-pinhole interferometer. This measurement does not require an interferometric setup, providing great experimental ease. In addition, a multi-pinhole interferometer can be made arbitrarily large and can therefore be adjusted to the expected speckle size. We present experimental results confirming our understanding.
منابع مشابه
Digital Speckle Pattern Interferometer for Measuring Micro Deformation Area
Nondestructive testing(NDT) and inspection of structural materials are becoming increasingly important to assure the safety level in the present industries. Nondestructive measuring techniques using an optical interferometer have emerged as a valuable tool for many industrial applications [1]. This non-contact optical method is a full-field measurement technique with high speed [2]. Recently, b...
متن کاملElectronic speckle-pattern interferometer using holographic optical elements for vibration measurements.
We report a simple, compact electronic speckle-pattern interferometer (ESPI) incorporating holographic optical elements (HOEs) for the study of out-of-plane vibration. Reflection and transmission HOEs provide reference and object beams in the interferometer. The alignment difficulties with conventional ESPI systems are minimized using HOEs. The time-average ESPI subtraction method is used to ge...
متن کاملThe Application of Multi-Layer Artificial Neural Networks in Speckle Reduction (Methodology)
Optical Coherence Tomography (OCT) uses the spatial and temporal coherence properties of optical waves backscattered from a tissue sample to form an image. An inherent characteristic of coherent imaging is the presence of speckle noise. In this study we use a new ensemble framework which is a combination of several Multi-Layer Perceptron (MLP) neural networks to denoise OCT images. The noise is...
متن کاملAn analysis of an optical vortices interferometer with focused beam
In recent years a lot of effort was put into testing and improving the idea of a three-beam interferometer known as an optical vortices interferometer (OVI). Devices based on the idea of the OVI allow measuring small rotation angles and small shifts with a superb resolution. Unfortunately, there are still many problems that have to be solved before an OVI-based device can go into production. In...
متن کاملThe technique for measuring changes in diffuse surfaces using Electronic Speckle Pattern Interferometry (ESPI) is well known
The technique for measuring changes in diffuse surfaces using Electronic Speckle Pattern Interferometry (ESPI) is well known. We present a new electronic speckle pattern interferometer that takes advantage of a single-frame spatial phase-shifting technique to significantly reduce sensitivity to vibration and enable complete data acquisition in a single laser pulse. The interferometer was specif...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Optics express
دوره 18 13 شماره
صفحات -
تاریخ انتشار 2010