Abstract: The present invention relates to a method, apparatus and system for measuring the content of either one or more gas analytes that may be part of a gas. The present invention applies a spectroscopic method that utilizes an extremely narrow linewidth laser beam that is absorbed when its wavelength is swept across the interval containing the absorption line of the analyte. The method, apparatus and system of the present invention is applicable to any analyte in gas phase that is part of a gas mixture, or to any analyte in a plasma phase, as well as analytes in other environments.

Abstract: The present invention relates to a method, apparatus and system for measuring the content of either one or more gas analytes that may be part of a gas. The present invention applies a spectroscopic method that utilizes an extremely narrow linewidth laser beam that is absorbed when its wavelength is swept across the interval containing the absorption line of the analyte. The method, apparatus and system of the present invention is applicable to any analyte in gas phase that is part of a gas mixture, or to any analyte in a plasma phase, as well as analytes in other environments.

Abstract: A tunable optical band-pass device for spectrally filtering an input light beam is provided. The device includes an interferometer having two inner reflective planar surfaces that face each other and are tilted at an angle ? with respect to each other, and a translation device for adjusting a relative spacing of the two reflective surfaces, thus tuning the device to any arbitrary wavelength within a broad tuning range. The device also includes an input port for inputting the input light beam in the interferometer and having the input light beam impinge on one of the reflective surfaces at an incidence angle ? with respect thereto which is substantially larger than the tilt angle ?, and be partially reflected and partially transmitted by this surface thereby producing multiple transmitted light beams. An optical element for collecting the multiple transmitted light beams and producing a spectrally-filtered output light beam is also included.

Abstract: An improved band pass interferometer for use as a high resolution wavelength selection unit comprising, as main elements, an input optical port (optical fiber) together with a fiber optic collimator for generating a narrow incoming collimated beam, two plane-parallel highly reflective surfaces with low reflection losses, one being totally reflective, (i.e. very little intensity of the light beam incident thereon should pass through the reflective surface,) the other being partially reflective, (i.e., a portion of a reflected light beam, more specifically its intensity, incident thereon should pass through the partially reflective surface becoming an output beam,) which splits the incoming narrow incoming collimated beam into a finite number of output beams, an optical medium located between the reflective surfaces, and a beam focusing element which collects all the output beams and focuses them into an output optical port (optical fiber). There is also provided a refractive index adjuster, such as, e.g.

Abstract: An apparatus and method is disclosed for reducing speckle of a laser beam, the apparatus comprising at least one beam-collimating element having an input and an output, at least one birefringent optical coupler having a first and a second inputs, and a first and a second outputs, at least one optical feedback element having an input and an output, the input of the at least one optical feedback element being connected to the second output of the at least one birefringent optical coupler and the output of the at least one optical feedback element being connected to the second input of the at least one birefringent optical coupler, an optical fiber connecting the output of the at least one beam-collimating element to the first input of the at least one birefringent optical coupler, an optical focusing element having an input and an output, and an optical fiber connecting the first output of the at least one birefringent optical coupler to the input of said optical focusing element, wherein said laser beam is pro

Abstract: A tunable band pass optical filter with tunable band-pass interferometer according to the present invention comprises a tunable band pass optical filter comprising a frame, at least one translation plate, at least one flexure element for mounting said at least one translation plate to said frame, a first mirror mounted to said at least one translation plate, a second mirror mounted to said frame in optical communication with said first mirror, having a distance between said first and said second mirror, at least one compensation screw operatively connected to said frame and said at least one translation plate; and at least one piezo-ceramic actuator operatively connected to said frame and said at least one translation plate.

Abstract: A method and an apparatus for dial indicator calibration comparing the real displacement of the dial indicator rod with its ideal linear displacement during each calibration interval given by the dial indicator hand, having a Michelson interferometer with a laser as a linear displacement transducer, an opto-electronic transducer to read the dial, indicator hand position for each calibration interval, an electronic control urgent which controls the operation of the whole apparatus and feeds to a printer the measuring errors in length units and the corresponding calibration intervals.