Condenser, photovoltaic devices and light-to-heat converter

Condenser has a first condenser lens, a second condenser lens, the first condenser lens guides the light incident condensing the first collection optics, converging by the second condenser lens constructed and a second focusing optical element for guiding incident light to the light incident. Collection optics are each a lower surface which extends facing the upper surface and the upper surface that transmits incident light, a reflecting surface provided to intersect with the optical axis of the incident light between the upper and lower surfaces, opposite side of the reflecting surface and an emission surface provided on. The as exit surface of the first focusing optical element and the first focusing optical element and the second focusing optical element reflecting surface of the second focusing optical element do not overlap vertically aligned vertically 1 converging optical element and the second focusing optical element is disposed one on top, a first condenser lens and the second light reflected by the respective condensed reflection surface by the condenser lens, the exit configured to be guided to the surface.