Abstract: In one aspect, a method of detecting a trace gas is disclosed. The method includes containing the trace gas in an optical cavity. The method further includes injecting a first laser light from a first laser into the optical cavity causing the trace gas to transition from an energy state lower that a first excited energy state to the first excited energy state, and injecting a second laser light from a second laser into the optical cavity causing the trace gas to transition from the first excited energy state to a second excited energy state. The method includes measuring, by a detector, a first cavity ringdown intensity as a function of time after turning off the second laser with the first laser on, and a second cavity ringdown intensity as a function of time after turning off the second laser with the first laser off.

Abstract: Systems and methods are provided for measuring the mechanical properties of ocular tissue, such as the lens or corneal tissue, for diagnosis as well as treatment monitoring purposes. A laser locking feedback system is provided to achieve frequency accuracy and sensitivity that facilitates operations and diagnosis with great sensitivity and accuracy. Differential comparisons between eye tissue regions of a patient, either on the same eye or a fellow eye, can further facilitate early diagnosis and monitoring.

Abstract: A fiber includes M primary cores and N redundant cores, where M an integer is greater than two and N is an integer greater than one. Interferometric circuitry detects interferometric pattern data associated with the M primary cores and the N redundant cores when the optical fiber is placed into a sensing position. Data processing circuitry calculates a primary core fiber bend value for the M primary cores and a redundant core fiber bend value for the N redundant cores based on a predetermined geometry of the M primary cores and the N redundant cores in the fiber and detected interferometric pattern data associated with the M primary cores and the N redundant cores. The primary core fiber bend value and the redundant core fiber bend value are compared in a comparison. The detected data for the M primary cores is determined reliable or unreliable based on the comparison. A signal is generated in response to an unreliable determination.

Abstract: Herein disclosed is an optoelectronic measuring device. The optoelectronic measuring device comprises an objective lens, an imaging lens, a camera, and an optical path adjusting module which are disposed at the first light path. The objective lens receives a first testing light, and transforms the first testing light into a second testing light. The imaging lens receives the second testing light, and transforms the second testing light into a third testing light. The camera measures a beam characteristic of the third testing light. The optical path adjusting module, disposed between the imaging lens and the camera, comprises a mirror, the mirror moves relatively to the imaging lens according to a test command, and adjusts the distance between the imaging lens and the camera at the first light path to be a first optical distance or a second optical distance. Wherein the mirror reflects the third testing light vertically.

Abstract: An on-chip interferometer and a spectrometer including the interferometer are provided. An on-chip interferometer includes a waveguide for propagation of an optical signal including an input waveguide; at least two interferometer arms having one or more slot waveguides; and an output waveguide; wherein the input waveguide is split into the at least two interferometer arms which are recombined into the output waveguide; and a control mechanism configured for controlling a relative time delay between optical signals propagating in the two interferometer arms by modifying one or more slot widths of one or more of the slot waveguides; and wherein the relative time delay is at least 1, 2, 5, or at least 10 fs or at least one optical period of the longest optical wavelength of the optical signal.

Abstract: The present application relates to a system for performing time-resolved interferometric spectroscopy of incoming light. In some embodiments, the system includes one or more optical elements, a photo-detector, a capacitance detector, and one or more processors. Upon application of a varying input signal to the one or more optical elements, a change to an optical characteristic is caused resulting in a changing interference pattern produced by the incoming light incident on the one or more optical elements. During the application of the varying input signal, the photo-detector may detect an intensity of light output from the one or more optical elements and the capacitance detector may detect a capacitance of the one or more optical elements.

Abstract: The invention relates to a device for a light-spectroscopic analysis of a, for example, liquid sample. In particular, light should be guided through a sample and then detected and/or analyzed photometrically, spectrophotometrically, fluorometrically, spectrofluorometrically and/or by means of phosphorescence or luminescence.

Abstract: Noise in cavity enhanced spectroscopy due to higher order mode excitation in a resonant cavity is reduced. There are two main points. The first point is that the source and detector are both fiber coupled, to provide the spatial filtering and other general advantages of fiber coupling. The second point is that the cavity is designed to ensure sufficient separation in frequency between the desired TEM00 mode and the first few higher order spatial modes.

Abstract: Disclosed herein is an all-digital phase and timing correction procedure for coherent averaging in dual-comb and multiheterodyne spectroscopy—applicable to any dual-comb spectroscopy setup. It can account for large frequency/phase instabilities of the used sources, yielding a significant reduction of the noise pedestal and an increase in signal-to-noise ratio (SNR) of the radio frequency (RF) beat notes. This technique is computationally efficient and can be conveniently implemented either as a post-processing algorithm or in a real-time data acquisition and processing platform without the necessity of adding any additional optical elements to the dual-comb spectroscopy system. By implementing this technique, the performance of any comb- or comb-like-source-based DCS system with a sufficient degree of mutual coherence between the optical modes can be improved in terms of SNR and number of spectroscopically-usable RF beat notes.

Abstract: The disclosed embodiments relate to multimodal imaging system, comprising: a fiber-coupled fluorescence imaging system, which operates based on ultra-violet (UV) excitation light; and a fiber-coupled optical coherence tomography (OCT) imaging system. The multimodal imaging system also includes a fiber optic interface comprising a single optical fiber, which facilitates light delivery to a sample-of-interest and collection of returned optical signals for both the fluorescence imaging system and the OCT imaging system. During operation of the system, the single optical fiber carries both UV light and coherent infrared light through two concentric light-guiding regions, thereby facilitating generation of precisely co-registered optical data from the fluorescence imaging system and the OCT imaging system.

Abstract: A device that is configured to detect spectrally resolved emission from a material is disclosed. The device includes an optical cavity comprising a pair of substrates separated by a distance defined to restrict a photonic density of states (DOS) of the material to be detected, a detector oriented with respect to the optical cavity to receive emission from the optical cavity and a controller configured to control the distance. The pair of substrates includes facing reflective surfaces.

Abstract: The invention relates to a method for compensation for different sensitivities at different wavelengths in a spectrometric measuring system, including steps of calibrating the measuring system in a wavelength range with respect to one or more known reference standards, creating a wavelength-dependent compensation algorithm for linearization, and adjusting the measuring system using the compensation algorithm. The invention further discloses a corresponding measuring system.

Abstract: An electrical polarity adjustable biosensor based on lossy mode resonance includes a first polarity module, a second polarity module, and a plurality of spacers disposed between the first polarity module and the second polarity module. A biomaterial sensing region for injecting an object to be tested is formed between a bioprobe layer of the first polarity module and a second electrode layer of the second polarity module. An electric field is formed between a lossy mode resonance layer of the first polarity module and the second electrode layer, and the electric field acts on a plurality of bioprobes of the bioprobe layer and the object to be tested. The present disclosure further includes a method of using the electrical polarity adjustable biosensor based on lossy mode resonance.

Abstract: An object recognition apparatus includes a first spectrometer configured to obtain a first type of spectrum data from light scattered, emitted, or reflected from an object; a second spectrometer configured to obtain a second type of spectrum data from the light scattered, emitted, or reflected from the object, the second type of spectrum data being different from the first type of spectrum data; an image sensor configured to obtain image data of the object; and a processor configured to identify the object using data obtained from at least two from among the first spectrometer, the second spectrometer, and the image sensor and using at least two pattern recognition algorithms.

Abstract: A coherent, entangled photon source which uses a continuous wave laser to replace pulsed photon excitation sources in multiphoton nonlinear processes. In various embodiments, the device comprises a continuous wave photon laser creating electromagnetic radiation at a specific frequency and narrow linewidth. The emitted beam may be conditioned by an optical fiber to allow for efficient interaction with a nonlinear crystal. The nonlinear material is designed and fabricated in a specific manner, enabling the quantum mechanical process of a single photon with well-defined energy being converted into two or more photons which display quantum correlations. The nonlinear material and subsequent fiber-optic or free space components control the temporal, spatial, and polarization-related quantum correlations such that the entangled photons can create a signal in multiphoton nonlinear processes that is the same or exceeds that of a pulsed photon source but at the average and peak powers of a continuous wave laser.

Abstract: A light detection device includes a Fabry-Perot interference filter provided with a light transmitting region on a predetermined line, a light detector disposed on one side with respect to the Fabry-Perot interference filter on the line, a package having an opening positioned on the other side with respect to the Fabry-Perot interference filter on the line, a light transmitting member provided in the package such that the opening is blocked, and a temperature control element having an endothermic region thermally connected to the Fabry-Perot interference filter and the light detector. The endothermic region is positioned on one side with respect to the light detector on the line.

Abstract: Devices and methods for detecting drugs, such as gamma hydroxybutyrate and gamma butyrolactone, using infrared spectrometry, and alerting an intended target of the drug, or others, to the presence of the drug.

Abstract: A spectrometry method used with an apparatus including a spectrometry section, a spectroscopic controller, a spectroscopic image generator, and a display section, the method including generating a teaching-purpose spectroscopic image, generating and displaying a teaching-purpose visualized image, identifying a first teaching area in the teaching-purpose visualized image and generating a first teaching-purpose spectrum, displaying a first icon based on the display color of the first teaching area, accepting teacher data that teaches chromaticity in correspondence with the first icon, generating a conversion rule based on the relationship between the spectrum and the teacher data, generating a measurement-purpose spectrum, and calculating chromaticity based on the conversion rule.

Abstract: Various embodiments are provided herein for an optical spectroscopy probe which generally includes a probe head having optical elements for coupling to an excitation fiber for receiving laser energy therefrom and generating a collimated excitation light beam; and a sample optic adjacent to the probe head, the sample optic having at least one optical element with two non-parallel surfaces to receive the collimated excitation light beam, to transmit the collimated excitation light beam to a sample, and to collect at least one afocal returning scattered light beam that is reflected from the sample.

Abstract: A multi-dispersive spectrometer is provided in which the spectrometer comprises an optical system configured to direct an excitation signal from an excitation light source toward a sample, receive a spectroscopy signal from the sample, and direct the spectroscopy signal toward the detector. The optical system comprises a movable optical component adapted to move the spectroscopy signal relative to at least one sensor of the detector and the detector is adapted to detect a plurality of discrete shifted spectroscopy signals. A method of obtaining a Raman spectrum from a sample is also provided. The method comprises directing an excitation signal from an excitation light source toward a sample; receiving a spectroscopy signal from the sample; and directing the spectroscopy signal toward a detector, wherein the spectroscopy signal is moved relative to at least one sensor of the detector to provide a plurality of discrete shifted spectroscopy signals.