Fig. 2: Rotational delay line. | Communications Physics

Fig. 2: Rotational delay line.

From: Frequency chirped Fourier-Transform spectroscopy

Fig. 2

a Realization of the rotational delay line (RDL) consisting out of three-dimensional rotational retro-reflecting (RR) octagrammic prism and a static retro-reflecting system (SR). The SR is arrange in such a way with respect to RR, that multiple reflections between SR and RR are possible. By exploiting the point symmetry of the system, the optical path delay can be doubled with two SR on opposite sides of the RR. b, c Top view of a beam propagation in the RDL at rotation angle 0∘ and α. d Recorded interferogram on each rotational retro-reflector of delay line.

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