Assignee: Picarro, Inc.

Location: Sunnyvale, CA
No. of patents: 24

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Number	Title	Issue Date
7813886	Calibration of frequency monitors having dual etalon signals in quadrature Improved calibration of a dual-etalon frequency monitor having x-y outputs is provided. An ellipse is fit to the (x,y) points from a set of calibration data. For each (x,y) point, an angle θ is determined. A linear fit of frequency to θ is provided. Differences be...	10/12/2010
7810376	Mitigation of gas memory effects in gas analysis The gas absorption/adsorption memory effect in gas analysis can be reduced by controlling gas flow conditions such that the partial pressure of the analyte of interest is held constant, if the measured analyte concentration is within a predetermined range. Keeping t...	10/12/2010
7777886	Optical system including a weak lens and a beam translation plate for selectively coupling to the lowest order mode of an optical resonator Improved optical alignment precision to a passive optical cavity is provided by including a combination of a weak focusing element and a translation plate in the input coupling optics. Adjustment of positions and angles of these optical elements, preferably after al...	08/17/2010
7646485	Method and apparatus for enhancing the accuracy of CRDS measurements A method and apparatus for enhancing the accuracy of spectroscopic measurements using a cavity ringdown spectrometer (CRDS) is provided. A first aspect of the invention consists of a novel algorithm for the processing of ring-down data that significantly reduces the...	01/12/2010
7535573	Cavity enhanced optical spectroscopy with a cavity having a predetermined deviation from a mode degeneracy condition Improved ease of mode matching to a passive optical cavity is provided by selecting a cavity design that has a predetermined deviation from a reference cavity design having high transverse mode degeneracy. This predetermined deviation tends to be small, so that the ...	05/19/2009
7420686	Wavelength measurement method based on combination of two signals in quadrature In a dual etalon wavelength monitor, improved performance is obtained by identifying first and second dead zones where the first and second etalon signals respectively have significantly reduced sensitivity. When a measurement is in the first dead zone, only the sec...	09/02/2008
7265842	Method for detecting a gaseous analyte present as a minor constituent in an admixture A gaseous target analyte present as a minor constituent in an admixture with at least one other gaseous species can be detected using a cavity enhanced optical spectrometer by a process comprising the steps of: i) identifying a plu...	09/04/2007
7259856	Method for the precise measurement of the wavelength of light Improved cavity ring down spectroscopy is provided by binning decay time vs. wavelength data into wavelength bins defined by discontinuities in a wavelength monitor signal. Average decay times and average wavelengths are computed for each bin. The optical loss of a ...	08/21/2007
7173754	Frequency conversion efficiency A phasor can be employed within the resonator of an optical parametric oscillator (OPO) to adjust the absolute and relative phase of OPO beams. An embodiment of the invention comprises an OPO having at least one phasor for receiving and adjusting the phase of one or...	02/06/2007
7154595	Cavity enhanced optical detector A cavity enhanced optical detector comprising: i) a source of continuous wave laser light; ii) a high finesse resonant cavity comprising at least three spaced apart, high-reflectivity mirrors positioned to receive light from the laser light source; iii) at least one...	12/26/2006
7116423	Flow cell for optical detection having reduced sensitivity to refractive index variation An apparatus for cavity enhanced optical detection having an improved flow cell is provided. Sensitivity of the cavity resonance condition to changes in refractive index of an analyte flowing through the flow cell is reduced. More specifically, the round trip optica...	10/03/2006
7106763	Wavelength control for cavity ringdown spectrometer A cavity ring-down spectrometer includes: a) multiple detectors for monitoring the intensity of the radiation emitted from the cavity and the wavelength of the radiation injected into the cavity; b) controllers whi...	09/12/2006
7101431	Periodically poled potassium titanyl phosphate crystal A thermal treatment process for improving the resistance of a flux grown, periodically poled KTiOPO4 crystal to photorefractive or photochromic damage comprising the steps of: i) heating said crystal from ambient tempera...	09/05/2006
7050170	Apparatus and method for maintaining uniform and stable temperature for cavity enhanced optical spectroscopy An enclosure for a cavity enhanced optical spectroscopy instrument provides a highly temperature stable environment by positioning the instrument optical cavity away from the enclosure walls and providing a wall mounted heat pump, fan and heat exchanger. The fan cau...	05/23/2006
7035298	Frequency conversion efficiency Improved multipass second harmonic generation (SHG) is provided by the use of an inverting, self-imaging telescope which ensures parallelism of all passes of all beams within the nonlinear medium. Improved multipass SHG is also provided by the use of a wedged phasor...	04/25/2006
6970484	Laser tuning by spectrally dependent spatial filtering A tunable laser and laser tuning method, based on the interaction of a spectrally dependent beam distortion and a spatial filter within a laser cavity. One embodiment of this laser is an external cavity semiconductor laser in which broad tunability is obtained by th...	11/29/2005
6967976	Laser with reflective etalon tuning element A tunable laser and laser tuning method based on the use of a tunable etalon in reflection as a mirror within a laser cavity and forming an end reflective surface thereof. The laser emission wavelength is not necessarily at a wavelength of peak etalon reflectivity. ...	11/22/2005
6959023	Laser with reflective etalon tuning element A tunable laser and laser tuning method based on the use of a tunable etalon in reflection as a mirror within a laser cavity. The laser emission wavelength is not necessarily at a wavelength of peak etalon reflectivity. A preferred embodiment makes use of a microele...	10/25/2005
6959024	Laser Tuning by spectrally dependent spatial filtering A laser tuning mechanism which embodies “spectrally dependent spatial filtering” (SDSF) and contemplates two key elements of the tuning mechanism. The first element of the SDSF tuning mechanism is a spectrally dependent beam distortion (i.e. alteration of the am...	10/25/2005
6859284	Apparatus and method for determining wavelength from coarse and fine measurements The present invention provides an apparatus for determining a wavelength of an optical signal by determining a coarse wavelength response and a fine wavelength response. The coarse wavelength response is achieved by utilizing an optical filter. A suitable detector d...	02/22/2005
6792010	Laser with reduced parasitic etalon effects According to the present invention, laser performance is improved by appropriately matching the spectral periods of various etalons within the laser cavity. A first embodiment of the invention is a discretely tunable external cavity semiconductor laser where a grid ...	09/14/2004
6741381	Modified tunable acousto-optic filter Acousto-optical filter systems for filtering a light beam by generating undiffracted and diffracted light beams within a birefringent crystal and by suppressing the diffracted beam within or at a face of the crystal. Where the two beams are noncollinear, an aperture...	05/25/2004
6658034	Surface-emitting semiconductor laser A laser suitable for intra-cavity laser absorption spectroscopy and for telecommunication system comprises a Bragg mirror, a multiple quantum well active region and an anti-reflective coating together with a second mirror spaced from the coating to define...	12/02/2003
6535327	CGA optical parametric oscillator An optical parametric oscillator and a laser system including an optical parametric oscillator is provided for producing widely tunable coherent light over about 6 μm, such as in the range of at least about 7 μm to 18 μm range. Optical parametric oscil...	03/18/2003

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Assignee: Picarro, Inc.