Abstract We propose a method for thermal expansion compensation of reference monolithic optical cavities laser frequency stabilization. Two schemes are considered: Fabry–Perot interferometer with crimp ring and whispering-gallery-mode cavity clamp. In each scheme, is achieved due to the strained connection an element made material high coefficient expansion. The temperature range cavities’ leng...

Optical fibers have been involved in the area of sensing applications for more than four decades. Moreover, interferometric optical fiber sensors have attracted broad interest for their prospective applications in sensing temperature, refractive index, strain measurement, pressure, acoustic wave, vibration, magnetic field, and voltage. During this time, numerous types of interferometers have be...

This paper reports design, fabrication and test results of a tunable pyroelectric detector with an integrated micromachined Fabry-Perot (FP) filter for gas analysis in the Mid-Wave Infrared (MWIR). The new approach is based on a bulk micromachined Fabry-Perot interferometer with an air cavity, which is electrostatically tuned. Various types of moveable reflectors and spring configurations have ...

An ideal zero-order Bessel beam consists of a superposition of monochromatic plane waves with wave vectors lying on a conical surface having the same magnitude. Several experiments have been reported that achieve such a superposition of plane waves. For example, this type of angular spectrum can be obtained by applying an annular slit in the focal plane of a lens1 or by the use of an axicon,2 a...

In this paper, a fiber based Fabry-Perot interferometer is proposed and demonstrated for a non-contact displacement measurement. A piece of micro-prism which attached to the mechanical vibrator is served as the target reflector. Interference signal is generated from the superposition between the sensing beam and the reference beam within the sensing arm of the fiber sensor. This signal is then ...

Optical Fabry-Perot interferometer sensors based on inner air-cavity is featured with compact size, good robustness and high strain sensitivity, especially when an ultra-thin air-cavity is adopted. The typical shape of Fabry-Perot inner air-cavity with reflection mode of operation is elliptic, with minor axis along with and major axis perpendicular to the fiber length. The first reflection surf...

We demonstrate a sub-micron silica diaphragm-based fiber-tip Fabry-Perot interferometer for pressure sensing applications. The thinnest silica diaphragm, with a thickness of ∼320  nm, has been achieved by use of an improved electrical arc discharge technique. Such a sub-micron silica diaphragm breaks the sensitivity limitation imposed by traditional all-silica Fabry-Perot interferometric pressu...

We propose a method for in-situ measurement of the length of kilometer size Fabry-Perot cavities in laser gravitational wave detectors. The method is based on the vernier, which occurs naturally when the laser incident on the cavity has a sideband. By changing the length of the cavity over several wavelengths we obtain a set of carrier resonances alternating with sideband resonances. From the m...

ABSTRACT We have newly developed a label-free protein sensor based on MEMS Fabry-Perot interferometer integrated with a photodiode, which utilizes nonlinear optical effect of the Fabry-Perot resonance to enhance the sensitivity of surface stress. A parylene was used for a deformable membrane of the protein sensor because of the high optical transmittance and low Young’s modulus. Theoretical sig...

Brillouin microscopy has recently emerged as a powerful technique to characterize the mechanical properties of biological tissue, cell, and biomaterials. However, the potential of Brillouin microscopy is currently limited to transparent samples, because Brillouin spectrometers do not have sufficient spectral extinction to reject the predominant non-Brillouin scattered light of turbid media. To ...