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

Claim 0:
1. A surface emitting laser with hybrid grating structure, comprising:
a semiconductor-laminated structure, capable of generating a laser light with a laser wavelength when receiving a predetermined current; the laser light being emitted vertically upward from at least one light-emitting surface of the semiconductor-laminated structure; the at least one light-emitting surface being located on a top surface of the semiconductor-laminated structure; and
a grating layer, formed on the semiconductor-laminated structure; the grating layer including a plurality of micro-grating structures distributed and arranged along at least a first horizontal direction;
wherein, the grating layer is divided into at least one first grating region and at least one second grating region at least along the first horizontal direction; each of the first and second grating regions respectively contains a plurality of the micro-grating structures;
wherein, a grating period of the micro-grating structures in each said first grating region is in accordance with the following mathematical formula:, ∧
   
    =
    
     m
     ⁢
     
      λ
      
       2
       *
       
        n
        eff
       
      
     
    
   
  
  ;
 

 in addition, the grating period of the micro-grating structures in each said second grating region is in accordance with the following mathematical formula:, ∧
   
    =
    
     O
     ⁢
     
      λ
      
       2
       *
       
        n
        eff
       
      
     
    
   
  
  ;
 

 wherein, ∧ is a length of grating period, λ is a wavelength of the laser light, neff is an equivalent refractive index of semiconductor waveguide; wherein m=1, and o=2;
wherein, the at least one light-emitting surface is defined by the at least one second grating region; the surface emitting laser emits laser light perpendicularly from the at least one light-emitting surface defined by the at least one second grating region;
wherein the grating layer also has a plurality of micro-grating structures along a second horizontal direction; the second horizontal direction is perpendicular to the first horizontal direction, and both the second horizontal direction and the first horizontal direction are perpendicular to the emitting direction of the laser light; the grating layer is also divided into at least one first grating region and at least one second grating region along the second horizontal direction, each of the first and second grating regions along the second horizontal direction also contains a plurality of the micro-grating structures respectively; when viewed downwardly from the top surface of the semiconductor-laminated structure, the micro-grating structures are arranged in a dot-like array on the grating layer; in addition, the at least one second grating region in the first horizontal direction and the at least one second grating region in the second horizontal direction cooperate to define said at least one light-emitting surface;
wherein the top surface of the semiconductor-laminated structure includes a plurality of individual said light-emitting surfaces separated from each other and arranged in an array-format; the grating layer is provided with the second grating region at each said light-emitting surface, no matter in the first horizontal direction or the second horizontal direction; in addition, except for the light-emitting surfaces, other portions of the grating layer are all provided with the first grating region regardless of whether it is in the first horizontal direction or the second horizontal direction; such that, several individually separated said light-emitting surfaces capable of emitting laser light are arranged in said array-format on the top surface of the semiconductor-laminated structure of the surface emitting laser.