Patent ID: 11967800
Assignee: TRUELIGHT CORPORATION
Field: Optics (Instruments)
Classification: CPC H | IPC H

Claim 1:
2. The surface emitting laser of claim 1, wherein the grating layer comprises at least two phase-shift grating structures; one of the phase-shift grating structures is located near a middle of the grating layer in the first horizontal direction, another one of the phase-shift grating structures is located near another middle of the grating layer in the second horizontal direction; the width of each of the phase-shift grating structures can provide a phase-difference distance, such that a phase difference is formed between the micro-grating structures located on both sides of the phase-shift grating structure along the first horizontal direction and the second horizontal direction respectively; the phase-difference distance provided by the phase-shift grating structure is one quarter of the laser wavelength.