Optical device and optical system

Abstract

Provided are an optical device and an optical system that can appropriately irradiate a magnetic element with reflected light from an irradiated object with a simple configuration without the need for highly accurate optical axis adjustment. An optical device 1A of one aspect includes at least one magnetic element 30 having a first ferromagnetic layer, a second ferromagnetic layer, and a spacer layer sandwiched between the first and second ferromagnetic layers, laser diodes 11, 12, 13, and 14 that emit laser light, and a waveguide 20. The waveguide 20 has at least one optical input port 21i, 22i, 23i, and 24i through which the laser light from the laser diodes 11, 12, 13, and 14 is incident, and an optical output port 27o through which the light is emitted to the outside, and at least one magnetic element 30 is disposed in the vicinity of the optical output port 27o.

Dependencies are inferred from the claim text.