Abstract:
A monolithic frame for optics used in interferometers where the material of the monolithic frame may have a substantially different coefficient of thermal expansion from the beamsplitter and compensator without warping, bending or distorting the optics. This is accomplished through providing a securing apparatus holding the optics in place while isolating the expansion thereof from the expansion of the frame. Stability in optical alignment is therefore achieved without requiring a single material or materials of essentially identical coefficients of thermal expansion. The present invention provides stability in situations where it is not possible to utilize a single material for every component of the interferometer.
Abstract:
A monolithic frame for optics used in interferometers where the material of the monolithic frame may have a substantially different coefficient of thermal expansion from the beamsplitter and compensator without warping, bending or distorting the optics. This is accomplished through providing a securing apparatus holding the optics in place while isolating the expansion thereof from the expansion of the frame. Stability in optical alignment is therefore achieved without requiring a single material or materials of essentially identical coefficients of thermal expansion. The present invention provides stability in situations where it is not possible to utilize a single material for every component of the interferometer.
Abstract:
A spectrometer is presented that can include a spectrally dispersive optical element to spectrally disperse a received light, a leveraged-optics adjustable deflector to adjustably deflect the spectrally dispersed light, and a detector array to receive the spectrally dispersed and adjustably deflected light. The received light can include an interference beam combined from a returned image beam and a reference beam in a Spectral Domain Optical Coherence Tomograph. The detector array can include a linear sensor array. The leveraged-optics adjustable deflector can include an optical element with an adjustable transmissive property or an adjustable reflective property, wherein the adjustable deflector is adjustable by a mechanical adjustment being optically leveraged into a smaller optical adjustment.
Abstract:
There is provided a method for analyzing optical properties of an object, including utilizing a light illumination having a plurality of amplitudes, phases and polarizations of a plurality of wavelengths impinging from the object, obtaining modified illuminations corresponding to the light illumination, applying a modification to the light illumination thereby obtaining a modified light illumination, analyzing the modified light illumination, obtaining a plurality of amplitudes, phases and polarizations maps of the plurality of wavelengths, and employing the plurality of amplitudes, phases and polarizations maps for obtaining output representing the object's optical properties. An apparatus for analyzing optical properties of an object is also provided.
Abstract:
Methods and apparatus are provided employing rapid scanning continuous wave terahertz spectroscopy and imaging for the non-destructive evaluation of materials such as animal hides and natural cork, and explosive detection, concealed weapon detection, and drug detection. A system employing an aperiodic detector array and implementing phase modulation at 100 kHz significantly reduces the imaging time and enables interferometric images of a THz point source to be obtained at several frequencies between 0.3 and 0.95 THz.
Abstract:
Disclosed herein are systems, computer-implemented methods, and tangible computer-readable storage media for wide field imaging interferometry. The method includes for each point in a two dimensional detector array over a field of view of an image: gathering a first interferogram from a first detector and a second interferogram from a second detector, modulating a path-length for a signal from an image associated with the first interferogram in the first detector, overlaying first data from the modulated first detector and second data from the second detector, and tracking the modulating at every point in a two dimensional detector array comprising the first detector and the second detector over a field of view for the image. The method then generates a widefield data cube based on the overlaid first data and second data for each point. The method can generate an image from the widefield data cube.
Abstract:
During the processing of complex semiconductor devices, dielectric material systems comprising a patterned structure may be analyzed in a non-destructive manner by using an FTIR technique in combination with a plurality of angles of incidence. In this manner, topography-related information may be obtained and/or data analysis may be made more efficient due to the increased amount of information obtained by the plurality of angles of incidence.
Abstract:
A spectrometer is described, especially for an optical coherence tomograph (1) for detecting parameters of the human eye, with said spectrometer having an input for measurement radiation to be analyzed, fanning the measurement radiation spectrally out along a direction in a fan and guiding it onto a detector that extends along the direction and comprises a plurality of detector pixels that are sensitive to the measurement radiation, with the spectrometer (2) having an adjusting element (5) which can be adjusted in a controlled manner to adjust the relative position of the fan and the detector (8), thereby optimizing the incidence position (F) of the fan on the detector (8), in which it is provided that the detector (8) has at least two superimposed, adjacent pixel lines, and a control device (9) is provided which reads out the superimposed pixels of a plurality of pixel lines in a combined manner for a spectral analysis of the measurement radiation in a pixel binning and evaluates signal differences between superimposed pixels to control the adjusting element (5) and to center the incidence position of the fan at a right angle to the direction of the pixel lines.
Abstract:
An interferometric method and system enabling light echoes-to-spectrum mapping, applicable for laser rangefinder, biomedical imaging including surface 3D mapping and tomography, vehicle position identification, and spectrum analysis. The direct mapping into spectrum allows a time-of-flight detection without using any timing pulse modulation. The sensitivity of the detection can be as high as that of the conventional low coherence interferometry, thereby an eye-safe and low-cost solution not compromising performance. In a practical implementation, high accurate range detection can be easily achievable with the level of accuracy equivalent to the laser rangefinder using a 20 ps Full-Width-at-Half-Maximum (FWHM) timing pulse. The system and method comprise applying dispersion-unbalanced interference (referred to as ‘cross-chirp interference’) and gating a phase matched spectral component. The dispersion unbalance used to induce linear one-to-one correspondence between the relative time delay and the spectral component, the performances in terms of range and resolution of the system and method increase with the increase in dispersion unbalance
Abstract:
A microscope comprising: a light sampler for collecting light from a measurement area of a sample; a multi-element detector having a plurality of photoelectric elements, for detecting the light collected by the light sampler, each photoelectric element corresponding to a minute measurement region in the measurement area with one-to-one correspondence; a Fourier transform spectrophotometer as a spectroscope; a data sampler for concurrently sampling intensity data sent from each photoelectric element of the multi-element detector at a timing determined by the Fourier transform spectrophotometer; and a data processor for obtaining time-resolved spectrum data for each minute measurement region according to temporally changed interference light data obtained by the data sampler.