New Deep-Ultraviolet Era on Raman Imaging
The microscope users are always fighting with wavelength selection. The optimum optical system will change according to the wavelength. Although Raman microscopes can use various wavelengths as light sources, it has been difficult to maintain performance at all wavelengths so far. This is because the glass used for the optical system shows different characteristics depending on the wavelength.
Especially in the ultraviolet region (light shorter than 400 nm wavelength), the characteristic of glass is remarkable. Conventional Raman microscopes have accepted performance deterioration. That is because the advantage of observation in the ultraviolet region is higher than the disadvantage of performance degradation.
RAMANtouch vioLa can only benefit from observation in the ultraviolet region. Ultraviolet observation with unprecedented high efficiency and high spatial resolution opens a new world of Raman imaging.
Here, we show a part of the optical systems installed in RAMANtouch vioLa. In the typical scanning optical system, the light is diffracted by the lens pair, but in RAMANtouch vioLa, the optical system called catadioptric optical system, the light is reflected and diffracted by the reflecting mirror and the correction lens instead of the lens pair. Thanks to this, we can perform highly accurate scanning even in deep ultraviolet rays.
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