Light emitting device and ranging device

A light emitting device comprising:

• a first light emitting element and a second light emitting element formed on a common semiconductor substrate;
• and
• a driving unit that operates to apply drive voltage to each of the first light emitting element and the second light emitting element,
• wherein each of the first light emitting element and the second light emitting element includes:
• a first reflector formed on the semiconductor substrate,
• a resonator formed on the first reflector and the resonator being disposed on or adjacent to a saturable absorption layer, and
• a second reflector formed on the resonator,
• wherein a reflectance of the second reflector of the first light emitting element and a reflectance of the second reflector of the second light emitting element are different, and
• wherein, in a case where the drive voltage is applied to each of the first light emitting element and the second light emitting element at the same timing, the first light emitting element and the second light emitting element respectively emit a pulse light at different timings.

A light emitting device comprising:

• a first light emitting element and a second light emitting element formed on a common semiconductor substrate;
• and
• a driving unit that operates to apply drive voltage to each of the first light emitting element and the second light emitting element,
• wherein each of the first light emitting element and the second light emitting element includes:
• a first reflector formed on the semiconductor substrate,
• a resonator formed on the first reflector and the resonator being disposed on or adjacent to a saturable absorption layer, and
• a second reflector formed on the resonator,
• wherein the drive voltage applied to the first light emitting device and the drive voltage applied to the second light emitting device are different from each other, and
• wherein, in a case where the drive voltage is applied to each of the first light emitting element and the second light emitting element at the same timing, the first light emitting element and the second light emitting element respectively emit a pulse light at different timings.