Coherent anti-Stokes Raman spectroscopy, also called Coherent anti-Stokes Raman scattering spectroscopy (CARS), is a form of spectroscopy used primarily in chemistry, physics and related fields. It is sensitive to the same vibrational signatures of molecules as seen in Raman spectroscopy, typically the nuclear vibrations of chemical bonds. Unlike Raman spectroscopy, CARS employs multiple photons to address the molecular vibrations, and produces a coherent signal. As a result, CARS is orders of magnitude stronger than spontaneous Raman emission. CARS is a third-order nonlinear optical process involving three laser beams: a pump beam of frequency ωp, a Stokes beam of frequency ωS and a probe beam at frequency ωpr. These beams interact with the sample and generate a coherent optical signal at
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| - Nichtlineare Raman-Spektroskopie (de)
- Coherent anti-Stokes Raman spectroscopy (en)
- Spettroscopia Raman Coerente anti-Stokes (it)
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| - Coherent anti-Stokes Raman spectroscopy, also called Coherent anti-Stokes Raman scattering spectroscopy (CARS), is a form of spectroscopy used primarily in chemistry, physics and related fields. It is sensitive to the same vibrational signatures of molecules as seen in Raman spectroscopy, typically the nuclear vibrations of chemical bonds. Unlike Raman spectroscopy, CARS employs multiple photons to address the molecular vibrations, and produces a coherent signal. As a result, CARS is orders of magnitude stronger than spontaneous Raman emission. CARS is a third-order nonlinear optical process involving three laser beams: a pump beam of frequency ωp, a Stokes beam of frequency ωS and a probe beam at frequency ωpr. These beams interact with the sample and generate a coherent optical signal at (en)
- Unter der nichtlinearen Raman-Spektroskopie versteht man eine Gruppe von spektroskopischen Untersuchungsverfahren, die auf der nichtlinearen Raman-Streuung von Licht an Festkörpern oder Gasen basiert. Zur Anregung werden (schmalbandige) Laser eingesetzt, weswegen diese Verfahren zur Laserspektroskopie gehören. Die Gruppe der nichtlinearen Raman-Spektroskopien lässt sich nach dem ausgenutzten Effekt in drei Hauptverfahren unterteilen: (de)
- La spettroscopia Raman Coerente anti-Stokes (indicata anche con l'acronimo inglese CARS, da Coherent anti-Stokes Raman spectroscopy) è un tipo di spettroscopia usata principalmente in chimica, fisica e in campi affini. Essa si basa, come la spettroscopia Raman, sulle vibrazioni nucleari dei legami chimici. Diversamente dalla spettroscopia Raman, la CARS impiega più fotoni per selezionare le vibrazioni molecolari e produce un segnale coerente. Ciò comporta che il segnale CARS è ordini di grandezza più intenso dell'emissione Raman spontanea. (it)
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| - Unter der nichtlinearen Raman-Spektroskopie versteht man eine Gruppe von spektroskopischen Untersuchungsverfahren, die auf der nichtlinearen Raman-Streuung von Licht an Festkörpern oder Gasen basiert. Zur Anregung werden (schmalbandige) Laser eingesetzt, weswegen diese Verfahren zur Laserspektroskopie gehören. Die Gruppe der nichtlinearen Raman-Spektroskopien lässt sich nach dem ausgenutzten Effekt in drei Hauptverfahren unterteilen: 1.
* Induzierte Raman-Streuung, auch stimulierte Raman-Streuung genannt (engl. stimulated Raman scattering, SRS) 2.
* Kohärente Anti-Stokes-Raman-Streuung (engl. coherent anti-Stokes Raman scattering, CARS) 3.
* Hyper-Raman-Effekte (engl.: Hyper-Raman Effects) (de)
- Coherent anti-Stokes Raman spectroscopy, also called Coherent anti-Stokes Raman scattering spectroscopy (CARS), is a form of spectroscopy used primarily in chemistry, physics and related fields. It is sensitive to the same vibrational signatures of molecules as seen in Raman spectroscopy, typically the nuclear vibrations of chemical bonds. Unlike Raman spectroscopy, CARS employs multiple photons to address the molecular vibrations, and produces a coherent signal. As a result, CARS is orders of magnitude stronger than spontaneous Raman emission. CARS is a third-order nonlinear optical process involving three laser beams: a pump beam of frequency ωp, a Stokes beam of frequency ωS and a probe beam at frequency ωpr. These beams interact with the sample and generate a coherent optical signal at the anti-Stokes frequency (ωpr+ωp-ωS). The latter is resonantly enhanced when the frequency difference between the pump and the Stokes beams (ωp-ωS) coincides with the frequency of a Raman resonance, which is the basis of the technique's intrinsic . Coherent Stokes Raman spectroscopy (CSRS pronounced as "scissors") is closely related to Raman spectroscopy and lasing processes. It is very similar to CARS except it uses an anti-Stokes frequency stimulation beam and a Stokes frequency beam is observed (the opposite of CARS). (en)
- La spettroscopia Raman Coerente anti-Stokes (indicata anche con l'acronimo inglese CARS, da Coherent anti-Stokes Raman spectroscopy) è un tipo di spettroscopia usata principalmente in chimica, fisica e in campi affini. Essa si basa, come la spettroscopia Raman, sulle vibrazioni nucleari dei legami chimici. Diversamente dalla spettroscopia Raman, la CARS impiega più fotoni per selezionare le vibrazioni molecolari e produce un segnale coerente. Ciò comporta che il segnale CARS è ordini di grandezza più intenso dell'emissione Raman spontanea. La CARS è un processo non-lineare del terzo ordine che coinvolge quindi tre fasci laser: un fascio di pompa di frequenza , un fascio di Stokes di frequenza e un fascio di sonda di frequenza . Questi fasci interagiscono col campione e generano un segnale ottico coerente a frequenza.Quest'ultimo si amplifica in modo risonante quando la differenza di frequenza tra i fasci di pompa e di Stokes è coincide con una frequenza di risonanza Raman, e questo dà origine al contrasto vibrazionale intrinseco della tecnica. (it)
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