SURFACE EMITTING LASER AND OPTICAL COHERENCE TOMOGRAPHY APPARATUS INCLUDING THE SAME

摘要

A surface emitting laser includes a lower reflector, an active layer, a gap portion, an upper reflector, and a driving unit. The lower reflector, the active layer, the gap portion, and the upper reflector are arranged in that order. The surface emitting laser is capable of varying a wavelength of emitted light by changing a distance between the upper and lower reflectors. The driving unit moves one of the upper and lower reflectors in an optical axis direction of the emitted light. At least one of the upper and lower reflectors includes a stacked body in which first layers and second layers are alternately stacked, the second layers having a refractive index lower than a refractive index of the first layers, outermost layers of the stacked body being the first layers, and a third layer provided on at least one end of the stacked body.

主权项

1. A surface emitting laser comprising:
a lower reflector; an active layer; a gap portion; an upper reflector; and a driving unit, wherein the lower reflector, the active layer, the gap portion, and the upper reflector are arranged in that order, wherein the surface emitting laser is capable of varying a wavelength of emitted light by changing a distance between the upper and lower reflectors, wherein the driving unit moves one of the upper and lower reflectors in an optical axis direction of the emitted light, and wherein at least one of the upper and lower reflectors includes
a stacked body in which first layers and second layers are alternately stacked, the second layers having a refractive index lower than a refractive index of the first layers, outermost layers of the stacked body being the first layers, anda third layer provided on at least one end of the stacked body and configured such that an optical thickness nd of the third layer satisfies 0