A coupling for usage in environments subject to vibriations which includes a universal joint disposed in series with a rod and coupled with a resilient bendable member that is rigidly attached to both sides of the universal joint.

The invention relates to a tunable magnetron having coaxial cathode and anode systems (13 and 11, 12) which define therebetween an annular, evacuated interaction space (18) and a rotatable tuning body (20, 24) supported by two ball bearings (21, 22). The tuning body (20, 24) with its bearings (21, 22) is situated in an evacuated space (25) communicating with the interaction space (18). A magnetic circuit having two pole shoes (16, 17), situated one on each side of the interaction space for produ...

A tunable laser is disclosed in which a plurality of laser beams different from one another in wavelength and polarization can be simultaneously oscillated. The tunable laser is advantageous among others in that an atomic absorption spectroscopic analysis can be carried out with very high sensitivity when it is used as, for example, a light source for two-wavelength measurement in the atomic absorption spectroscopic analysis.

A stethoscope head comprising a body member having a first generally bell-shaped recess, a diaphragm, a suspension member for connecting the diaphragm to the body member, and an immobilizing means located within the first recess. The suspension member affords movement of the diaphragm in a direction generally perpendicular to the plane of the diaphragm without the shape of or lateral tension in the diaphragm changing substantially. The suspension member also permits at least one of the diaphragm...

A tunable laser having a range of possible emission frequencies has a Bragg cell mounted inside its laser cavity such that only light passing through the Bragg cell without Bragg deflection will be emitted by the laser.

Apparatus for obtaining laser action at a selected wavelength comprises a body such as a crystal composed of a substance that may be optically pumped in accordance with known laser principles. A glow discharge tube serves as a source of input radiation energy for the optical pumping and excites energy levels from which radiation is emitted at a plurality of wavelengths. An optical path for the crystal is provided and includes a pair of reflective surfaces between which the crystal and a prism ar...

A LASER having at one end of the optical cavity a frequency selective reflector that varies the frequency of the light reflected back into the cavity by rotation. The selective reflector is supported on a first set of bearings and a tuning adjustor for rotating the reflector is supported on a separate bearing. A flexible coupling element connects the adjustor and reflector for positive rotational positioning with essentially no load coupled along other axes.

A tunable resonant cavity device is provided which contains a pair of metal bellows connected in tandem with one end of each bellows anchored to fixed spaced locations within the body of the device. One fixed end of one bellows is sealed closed, whereas the other fixed end contains an opening through which one mechanical element in the tuning mechanism extends. The bellows are joined in tandem by a moveable member to which an end of each bellows is sealed. The moveable member contains a passage ...

A tunable laser includes a laser medium (24), a resonant cavity (27, 28), at least one Faraday rotation element (26), and a polarization sensitive attenuator (25). Waves of laser energy produced by the laser medium resonate in the resonant cavity between a 100% reflective surface (27) and a partially transmitting mirror surface (28). The waves pass through the attenuator (25) and are linearly polarized. The linearly polarized waves pass through the Faraday rotation element (26) and the polarizat...

In a magnetically-tunable resonator, a wave-guiding structure comprising an electromagnetic frequency filter, or component of such a filter, is placed in sufficient proximity with a magnetic structure so as to be gyromagnetically coupled therewith. The resonator is supportable of two fundamental normal modes of propagation which, in the absence of magnetic interaction are even and odd with respect to the resonator center plane of symmetry. Each normal mode possesses a spectrum of resonance frequ...