MULTIPASS OPTICAL SYSTEM FOR EXCITING RAMAN SCATTERING SPECTRA Russian patent published in 2012 - IPC G01J3/44 G01N21/65 

FIELD: physics.

SUBSTANCE: multipass optical system consists of two identical spherical mirrors whose centres lie at diametrically opposite points of the surface one imaginary sphere, having radius equal to the radius of curvature of the mirrors, as well as a laser and a focusing lens, lying on one optical axis which passes inside that sphere at a certain distance from its centre and cross the surface of the first mirror. The focus of the lens lies at about the distance of the radius of curvature of the mirror from that point of intersection. In the plane formed by the optical axis of the lens and the centre of the sphere, the optical axis of the second mirror makes an angle of γ=α²/[2(β-2α)] with the radius of the sphere extending to the centre of the second mirror, where α=arcsin(r/2R), β=arcsin(R₀/R), wherein r is the radius of the laser beam, R₀ is the size of the mirrors, R is the radius of curvature of the mirrors.

EFFECT: high intensity of the Raman scattering signal.

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