in [Helsinki .
Written in English
|Series||Societas Scientiarum Fennica. Commentationes physico-mathematicae,, v. 31, nr. 5, 1965, Commentationes physico-mathematicae ;, v. 31, nr. 5.|
|LC Classifications||Q60 .F555 vol, 31, no. 5|
|The Physical Object|
|LC Control Number||a 68000268|
A resonant mirror as a high-Q dielectric resonator can accumulate a strong evanescent field at its surface, and this field has been proposed for surface/interface Raman enhancement applications for a while. However, the theoretically predicted large Raman enhancement effect of a resonant mirror had never been experimentally demonstrated until our work reported here, primarily Cited by: 7. In the present work, efficiency of classical lens, mirror-lens, and pure mirror variants of the collection optics for a Raman spectrometer based on 90° geometry of scattered light collection is investigated. It is experimentally established that, despite a smaller collection angle, in the case of a relatively narrow input slit of the spectrometer (<μm), the lens Cited by: 1. tion of Raman-scattered light collection). For CERS, there are two typical Raman- scattered light collection directions, 0 as shown in Figure 2. laser-excited Raman measurement by Sharma et al. (17). The bench-top telescopic ﬂuo- rescence system consisted of an imaging spectrograph equipped with a grooves/mm.
In the demonstration of a Raman laser , the threshold power was relatively large (about W) because of a short fiber length (L = m) used in the experiment. In subsequent experiments [44–46], the threshold was reduced to a level ∼1 W by using longer fibers (L ∼ 10 m). This feature permitted CW operation of a Raman laser at wavelengths in the range – μm using an. Delivering the light Raman microscope systems typically operate in with the excitation direction and collected Raman scattering direction separated This mode of collection and excitation is referred to as “back-scattering”. Typically back-scattered Raman collection necessitate special optics that operate both as a Rayleigh filter and. A Raman probe must be capable of directing and focusing the monochromatic excitation source (typically a laser) to the sample, collecting the scattered light and then directing it to the spectrometer. Figure R-6 shows a typical design for a Raman probe. Figure R-6 Typical Design of a Raman Probe. The correct Raman laser is especially important for Raman spectroscopy when compared with other spectroscopic techniques because the Raman shift is directly related to the light source and the measured spectroscopic data cannot be decoupled from the light source. The Raman Effect is a very weak effect and is directly proportional to the power.
Raman Imaging Jacques Barbillat I. INTRODUCTION For many years Raman spectroscopists have collected spectral data, either from a large amount of sample material or from a specific region, by focusing the laser beam onto a small area - sometimes determined by the diffraction limit of the light excitation. The Raman excited light passes through this mirror and filter and is collected by a spectrometer (a monochromator (Shamrock SRi, Andor Technology) with a lines per mm grating, blazed at nm, and a deep depletion, back illuminated and thermoelectrically cooled CCD camera (Newton, Andor Technology)). A device for the collection of Raman scattered light by means of an internally reflective sphere 10 wherein a light source 12 provides light to and through a sam which light is reflected back through that sample by the internally reflective sphere The sample is viewed by means of a spectrograph 30 focused by len 28 or a fiberoptic light pipe a laser-excited raman spectrometer in which a laser output beam having a very small diameter is projected along the length of a capillary sample cell, rather than being projected in a transverse direction. the beam is substantially coaxial with the cell and the resultant raman travelling in the general direction of the cell axis is detected.