Abstract:
The subject matter described herein includes a curved VPH grating with tilted fringes and spectrographs, both retroreflective and transmissive, that use such gratings. A VPH grating according to the subject matter described herein includes a first curved surface for receiving light to be diffracted. The grating includes an interior region having tilted fringes to diffract light that passes through the first surface. The grating further includes a second curved surface bounding the interior region on a side opposite the first surface and for passing light diffracted by the fringes.
Abstract:
A broadband light source includes one or more laser diodes that are capable of generating a pump signal having a wavelength shorter than 2.5 microns, a pulse width of at least 100 picoseconds and a pump optical spectral width. The light source also includes one or more optical amplifiers that are coupled to the pump signal and are capable of amplifying the pump signal to a peak power of at least 500W. The light source further includes a first fiber that is coupled to the one or more optical amplifiers. The first fiber including an anomalous group-velocity dispersion regime and a modulational instability mechanism that operates to modulate the pump signal. In one particular embodiment, the pump signal wavelength resides in the anomalous group- velocity dispersion regime of the first fiber and where different intensities in the pump signal can cause relative motion between different parts of the modulated pump signal produced through modulational instability in the first fiber. The light source also including a nonlinear element that is coupled to the first fiber that is capable of broadening the pump optical spectral width to at least 100nm through a nonlinear effect in the nonlinear element.
Abstract:
안정적인 데이터 추출을 위한 정합 필터 기반의 광대역 신호 수신기를 이용한 광분광학 시스템 및 그 제어 방법이 개시된다. 광분광학 시스템은, 복수의 광원을 이용하여 대상의 특정부위로 빛을 방사하되, 상기 복수의 광원에서 방사되는 빛을 월시 코드(Walsh code)를 이용하여 코드 모듈레이션하여 방사하는 광 전송부; 및 상기 특정부위를 통과하여 나오는 빛을 검출하되, 상기 월시 코드를 이용하여 상기 빛을 디모듈레이션하여 광원을 식별하는 광 수신부를 포함할 수 있다.
Abstract:
La présente invention concerne un Dispositif de spectroscopie, comprenant une zone d'analyse (2), destinée à recevoir un échantillon; au moins une diode électroluminescente (3), agencée pour émettre vers la zone d'analyse (2) un faisceau lumineux (4) ayant un profil spectral d'intensité lumineuse dans un intervalle de travail de longueur d'onde; des moyens (5) pour faire varier dans le temps le profil spectral d'intensité lumineuse émis par cette diode (3) dans l'intervalle de travail de longueur d'onde de cette diode; un détecteur (6, 8, 9), agencé pour recevoir, pendant une variation dans le temps du profil spectral d'intensité lumineuse émis par cette diode (3), le faisceau lumineux (4) émis par cette diode (3) et ayant traversé la zone d'analyse (2), et fournir un signal de détection (Α') du faisceau lumineux émis par cette diode (3) et reçu par le détecteur, sous la forme d'un signal qui dépend d'au moins une caractéristique représentative du profil spectral d'intensité lumineuse de cette diode électroluminescente. Application à la spectroscopie par dérivées.
Abstract:
The present invention relates to the multispectral imaging of samples, in particular of biological tissues. The invention further relates to a method for acquisition of fluorescence images and reflection images of an object (400) comprising the steps of alternatingly illuminating the object (400) with at least a first light and a second light, wherein the first light and the second light are spectrally shaped such that at least one light has several spectral regions of high light intensity separated by spectral region(s) of low light intensity, wherein the spectral regions of the first light and the second light with high intensity at least partially do not overlap and wherein at least one of the two lights has at least one region of low light intensity that is of longer wavelength to the neighboring region of high light intensity, and recording at least a first image of the object (400) and a second image of the object (400) while illuminating the object (400) with at least one of the lights wherein the light to be recorded as the first image is modified such, that at least one spectral region of high intensity of the second light is attenuated, and wherein the light to be recorded as the second image is modified such, that at least one spectral region of high intensity of the first light is attenuated.
Abstract:
A small size, robust stimulated Raman scattering (SRS) spectrophotometer system for industrial, medical and field use, exhibiting high SNR, high resolution and very short acquisition times. The architecture of the system allowing for such features comprises three main elements: (1). Use of a narrow range tunable pump laser and an array of fixed wavelength lasers to produce the wavelength differences as required to generate the SRS (Raman) spectrum; (2). Application of analog signal processing, prior to the digital conversion, in order to obtain higher resolution and SNR; (3). Use of relatively inaccurate or unstable laser sources coupled to calibration samples, followed by various calibration methods to compensate for system instabilities, such as wavelength drift, laser inaccuracies, and variations in the optical components/elements of the system.
Abstract:
본발명은측정대상으로부터발사된측정광을고정미러부와가동미러부에입사시켜, 상기고정미러부에의해서반사된측정광과상기가동미러부에의해서반사된측정광의간섭광을형성한다. 이때, 상기가동미러부를이동시킴으로써측정광의간섭광강도변화를얻고, 이변화에기초하여측정광의인터페로그램을구한다. 또, 동시에, 측정광의파장대역의일부인협대역파장의참조광을, 상기고정미러부와상기가동미러부에입사시켜, 그고정미러부에의해서반사된참조광과그 가동미러부에의해서반사된참조광의간섭광을형성한다. 이때, 상기가동미러부를이동시킴으로써참조광의간섭광강도변화의진폭, 및상기측정광중 상기참조광과같은파장의측정광과상기참조광의위상차에기초하여상기측정광의인터페로그램을보정하고, 보정후의인터페로그램에기초하여상기측정광의스펙트럼을구한다.