Patent ID: 11923655
Assignee: HAMAMATSU PHOTONICS K.K.
Field: Optics (Instruments)
Classification: CPC H | IPC H

Claim 2:
3. The light emission device according to claim 1,
wherein the phase distribution is a phase distribution in which a first phase distribution for forming the optical image and a second phase distribution unrelated to the formation of the optical image are superimposed,
the second phase distribution is a phase distribution for adding a diffraction vector having certain constant magnitude and orientation to second in-plane wavenumber vectors in four directions in the first phase distribution formed in the reciprocal lattice space of the phase modulation layer, the second in-plane wavenumber vectors in four directions each including a wavenumber spread corresponding to an angle spread of output light forming the optical image, and
a magnitude of at least one third in-plane wavenumber vector, out of third in-plane wavenumber vectors in four directions corresponding to the first in-plane wavenumber vectors in the four directions, is set to be smaller than 2π/λ, the third in-plane wavenumber vectors in the four directions being obtained by adding the diffraction vector to the second in-plane wavenumber vectors in the four directions.