A novel concept for an electric-field (E-field) probe is proposed. The reactive near field, induced by an impinging E-field, of a very short, short-circuited receiving dipole is measured with the aid of an electro-optical modulator. The modulator is designed as a Fabry-Perot etalon. The laser light guided in the etalon is modulated proportionally to the near field of the antenna. The advantage ...

Physical Sciences Inc. has developed and tested two long-wavelength infrared (LWIR) hyperspectral imaging spectroradiometers based on the insertion of a rapidly tunable Fabry-Perot etalon in the field of view of a HgCdTe focal plane array (FPA). The tunable etalon-based optical system enables a wide fieldof-view and the acquisition of narrowband (7 to 11 cm spectral resolution), radiometrically...

The virtually-imaged phased array (VIPA) is a side-entrance etalon with potential application as a high-resolution spectral disperser for wavelength division multiplexing. Here we present an approximate analytical spectral dispersion law for the VIPA, which we confirm experimentally.

Aims. A tunable, high spectral resolution, high effective finesse, vacuum ultraviolet (VUV) Fabry-Perot interferometer (FPI) is designed for obtaining narrow-passband images, magnetograms, and Dopplergrams of the transition region emission line of CIV (155 nm). Methods. The integral part of the CIV narrow passband filter package (with a 2–10 pm FWHM) consists of a multiple etalon system compose...

The spectral narrowing of emission in the linear region of passively mode-locked lasers is thought to increase the final pulse duration obtained in the nonlinear mode-locking region. Properly adjusted Fabry— Perot interferometers were applied for partial suppression of natural mode-selection in mode-locked ruby [ 1,2] Nd-glass [3,4], and Nd—YAG lasers [5]. Pulse shortening factors between 1.5 a...

A variety of strain sensors have been developed to measure internal deformations of elastomeric structures. Strain sensors measuring extremely small mechanical strain, however, have not yet been reported due mainly to the inherently intrusive integration of the sensor with the test structure. In this work, we report the development of a minimally intrusive, highly sensitive mechanical strain tr...

The thermal Doppler Michelson interferometer is the primary element of a proposed limb-viewing satellite instrument called SWIFT (Stratospheric Wind Interferometer for Transport studies). SWIFT is intended to measure stratospheric wind velocities in the altitude range of 15-45 km. SWIFT also uses narrowband tandem etalon filters made of germanium to select a line out of the thermal spectrum. Th...