Degree of polarization in the Lyot depolarizer

Abstract

Abstract-Analytic output equations for the degree of polarization of light exiting a Lyot depolarizer are derived from a coherency matrix representation. Design miteria are obtained for sources of different spectral shape.

High-stable Erbium superluminescent fiber optical sources creation methods

“…Деполяризатор Лио состоит из двух отрезков анизотропного волокна типа PANDA, оси анизотропии в которых развернуты друг относительно друга на 45º, а длины относятся как 1:2, при этом длина единич-ного участка волокна выбирается такой, чтобы у распространяющегося оптического излучения возникал набег фаз между двумя ортогональными поляризационными компонентами больше длины временной когерентности. Тогда на выходе деполяризатора любая поляризационная компонента преобразуется в две ортогональные компоненты, разнесенные на время, большее времени когерентности входного излучения, следовательно, выходное излучение оказывается «квази»-деполяризованным [28].…”

Polarization changes at Lyot depolarizer output for different types of input beams

“…The specific situation of input beam in which the spectral components of the superposition are uniformly and completely polarized [P in r P in st P in 1] with the same state of polarization, for example, linear, and different wavelengths has been previously studied in [10][11][12][13][14][15], where uniformly polarized polychromatic beams emitted by a single source are considered. In this case, at the output of the LD, P out st is close to zero, and then the beam is locally and globally depolarized.…”

“…A device used for this purpose is the Lyot depolarizer (LD). Since the introduction of this device a long time ago [8], many theoretical and experimental works has been devoted to the study of the LD [9][10][11][12][13], and several applications have recently been proposed [14][15][16][17]. They are manufactured with two parallel synthetic crystal quartz plates assembled with their optic axes lying in the plane of the plates and forming a 45°angle (see Fig.…”

Depolarization bandwidth of fiber optic passive depolarizers

“…Several devices implementing this technique have been described in the literature. [11][12][13][14] These devices are often referred to as passive depolarizers, since the polarization changes are obtained by exploiting the random phase changes ͑lack of coherence͒ of the light source. Thus, the output SOP is in turn random and depolarization is obtained when the light is averaged over a time interval usually assumed to be infinite, but which in practice must be large compared to 1/⌬, where ⌬ is the fullwidth-half-maximum ͑FWHM͒ source spectral width.…”