Light emitting device and projector

A light emitting device comprising:

• a light emitting waveguide layer including:
• a first semiconductor portion being configured by an indirect transition semiconductor;
• and
• a second semiconductor portion being configured by an indirect transition semiconductor, having a conductive type different from the first semiconductor portion, and forming a pn junction with the first semiconductor portion;
• an electrode being provided to the second semiconductor portion on a side opposite to the first semiconductor portion and injecting an electric current into the pn junction;
• and
• at least one optical portion, wherein
• the light emitting waveguide layer has a longitudinal direction in a first direction,
• the light emitting waveguide layer generates, at the pn junction, light having an energy smaller than a band gap energy of the semiconductors constituting the first semiconductor portion and the second semiconductor portion, and causes the light being generated to resonate in the first direction, and
• the optical portion emits the resonating light to a second direction intersecting with the first direction.