A new heterodyne nano-displacement with error reduction is presented. The main errors affecting the displacement accuracy of the nano-displacement measurement system including intermodulation distortion error, cross-talk error, cross-polarization error and phase detection error are calculated. In the designed system, a He-Ne laser having three-longitudinal-mode is considered as the stabiliz...

The application of CMOS processing techniques developed in the microelectronics world to that of silicon photonics has been the catalyst for the rapid proliferation of smaller, higher performance, and more densely integrated photonic devices that are rapidly advancing the field with large-scale implementations of photonic systems. It is only logical that as the silicon photonics library continu...

The single-mode linewidth of an erbium-doped, single-frequency, fiber ring laser has been measured by using a newly developed loss-compensated delayed self-heterodyne interferometer that has a resolution of less than 600 Hz. The natural linewidth is determined to have an upper bound of less than 2 kHz. In addition, frequency jitter was found to be dominant over the natural mately 4 kHz.

A fiber-based four-channel heterodyne interferometer has been developed to study the properties of pulsed plasma. The accuracy phase measurements was 0.03 rad, which corresponds an error in measuring concentration free electrons ± 1· 10 19 m -2 . Measurements electron density and plasma velocity accelerator have carried out.. Keywords: laser interferometer, interferometer.

Using a Nd:YVO 4 microchip laser with a relaxation frequency in the megahertz range, we have experimentally compared a heterodyne interferometer based on a Michelson configuration with an autodyne interferometer based on the laser optical feedback imaging (LOFI) method regarding their signal to noise ratios. In the heterodyne configuration, the beating between the reference beam and the signal ...

A lightweight and electrically passive interferometer is demanded by a number of applications for precision metrology such as machine tool metrology and on-machine feedback [1]. To satisfy these requirements, a fiber-optic coupled heterodyne displacement measuring Michelson interferometer (FIDMI) shown in Fig.1 has been developed in the Center of Precision Metrology (CPM) at the University of N...

Using an Nd:YVO₄ microchip laser with a relaxation frequency in the megahertz range, we have experimentally compared a heterodyne interferometer based on a Michelson configuration with an autodyne interferometer based on the laser optical feedback imaging (LOFI) method regarding their signal-to-noise ratios. In the heterodyne configuration, the beating between the reference beam and the signal ...

We have developed a modified version of a scanning holography microscope in which the Fresnel Zone Plates (FZP) are created by a homodyne rather than a heterodyne interferometer. Therefore, during the scanning the projected pattern on the specimen is frozen rather than varied as previously. In each scanning period the system produces an on-axis Fresnel hologram. The twin image problem is solved...

Heterodyne displacement interferometry is a widely accepted methodology capable of measuring displacements with sub-nanometer resolution. The objective of this thesis is to demonstrate a compact, fiber-delivered displacement measuring interferometer which can be used to simultaneously calibrate the linear motion and rotational errors of a translating stage using a single measurement beam. Heter...

A phase-sensitive heterodyne interferometer/polarimeter for measurement of electron densities and plasma fluctuation structures is described. The instrument utilizes a frequency swept-source to provide a frequency offset for heterodyne detection methods. Only two detectors are required to obtain the interferometric and polarimetric information which is encoded as a phase modulation on the inter...