Laser emitting unit and lidar device using the same
A vertical cavity surface emitting laser (VCSEL) array, comprising: a first sub-array includes a plurality of VCSEL units arranged along a first axis, and wherein the first sub-array includes: a first VCSEL unit includes a first upper contact and a first bottom contact; and a second VCSEL unit includes a second upper contact and a second bottom contact; a first contact electrically connected to the first upper contact and the second bottom contact; and a second contact electrically connected to the second upper contact and the first bottom contact, wherein the first VCSEL unit is operated when a first voltage is applied to the first contact and a second voltage smaller than the first voltage is applied to the second contact, and wherein the second VCSEL unit is operated when the second voltage is applied to the first contact and the first voltage is applied to the second contact.
1. A vertical cavity surface emitting laser (VCSEL) array, comprising:
a first sub-array includes a plurality of VCSEL units arranged along a first axis, and wherein the first sub-array includes:
a first VCSEL unit includes a first upper contact and a first bottom contact; and
a second VCSEL unit includes a second upper contact and a second bottom contact;
a first contact electrically connected to the first upper contact and the second bottom contact; and
a second contact electrically connected to the second upper contact and the first bottom contact,
wherein the first VCSEL unit is operated when a first voltage is applied to the first contact and a second voltage smaller than the first voltage is applied to the second contact, and
wherein the second VCSEL unit is operated when the second voltage is applied to the first contact and the first voltage is applied to the second contact.
2. The VCSEL array of claim 1 , wherein the first upper contact and the second bottom contact are the same metal layer.
3. The VCSEL array of claim 1 , wherein the second upper contact and the first bottom contact are the same metal layer.
4. The VCSEL array of claim 1 , wherein the first voltage is positive voltage with respect to a reference voltage, and wherein the second voltage is negative voltage with respect to the reference voltage.
5. The VCSEL array of claim 1 , the VCSEL array further comprising:
a first wire electrically connected to the first contact; and
a second wire electrically connected to the second contact.
6. The VCSEL array of claim 1 ,
wherein the first sub-array further including:
a third VCSEL unit includes a third upper contact and a third bottom contact; and
a fourth VCSEL unit includes a fourth upper contact and a fourth bottom contact; and
wherein the VCSEL array further comprising:
a third contact electrically connected to the third upper contact and the fourth bottom contact;
wherein the second contact electrically connected to the fourth upper contact and the third bottom contact,
wherein the third VCSEL unit is operated when a third voltage is applied to the second contact and a fourth voltage greater than the third voltage is applied to the fourth contact, and
wherein the fourth VCSEL unit is operated when the fourth voltage is applied to the second contact and the third voltage is applied to the third contact.
7. The VCSEL array of claim 1 , the VCSEL array further comprising:
a second sub-array includes a plurality of VCSEL units arranged along the first axis, wherein the first sub-array and the second sub-array are arranged along a second axis different from the first axis, and wherein the second sub-array including:
a third VCSEL unit includes a third upper contact and a third bottom contact, and
a fourth VCSEL unit includes a fourth upper contact and a fourth bottom contact, and
a third contact electrically connected to the third bottom contact and the fourth upper contact;
wherein the first contact electrically connected to the third upper contact and the fourth bottom contact,
wherein the fourth VCSEL unit is operated when a third voltage is applied to the first contact and a fourth voltage greater than the third voltage is applied to the third contact, and
wherein the third VCSEL unit is operated when the fourth voltage is applied to the first contact and the third voltage is applied to the third contact.
8. A vertical cavity surface emitting laser (VCSEL) array, comprising:
a first sub-array includes a plurality of VCSEL units arranged along a first axis, wherein the first sub-array includes:
a first VCSEL unit includes a first upper Distributed Bragg Reflector (DBR) and a first bottom DBR; and
a second VCSEL unit includes a second upper Distributed Bragg Reflector (DBR) and a second bottom DBR;
a first contact electrically connected to the first upper DBR and the second upper DBR; and
a second contact electrically connected to the first bottom DBR and the second bottom DBR;
wherein the first upper DBR and the second bottom DBR are doped with P type,
wherein the second upper DBR and the first bottom DBR are doped with N type,
wherein the first VCSEL unit is operated when a first voltage is applied to the first contact and a second voltage smaller than the first voltage is applied to the second contact, and
wherein the second VCSEL unit is operated when the second voltage is applied to the first contact and the first voltage is applied to the second contact.
9. The VCSEL array of claim 8 , wherein the first voltage is positive voltage with respect to a reference voltage, and wherein the second voltage is negative voltage with respect to the reference voltage.
10. The VCSEL array of claim 8 , the VCSEL array further comprising:
a common contact electrically connected to the first bottom DBR and the second bottom DBR;
wherein the second contact electrically connected to the first bottom DBR and the second bottom DBR through the common contact.
11. The VCSEL array of claim 8 , the VCSEL array further comprising:
a first wire electrically connected to the first contact; and
a second wire electrically connected to the second contact.
12. The VCSEL array of claim 8 , the VCSEL array further comprising:
a second sub-array includes a plurality of VCSEL units arranged along the first axis, wherein the first sub-array and the second sub-array are arranged along a second axis different from the first axis and wherein the second sub-array including:
a third VCSEL unit includes a third upper DBR and a third bottom DBR; and
a fourth VCSEL unit includes a fourth upper DBR and a fourth bottom DBR; and
a third contact electrically connected to the third bottom DBR and the fourth bottom DBR;
wherein the third upper DBR and the fourth bottom DBR are doped with P type,
wherein the fourth upper DBR and the third bottom DBR are doped with N type,
wherein the first contact electrically connected to the third upper DBR and the fourth upper DBR,
wherein the fourth VCSEL unit is operated when a third voltage is applied to the first contact and a fourth voltage greater than the third voltage is applied to the third contact, and
wherein the third VCSEL unit is operated when the fourth voltage is applied to the first contact and the third voltage is applied to the third contact.
13. The VCSEL array of claim 12 , the VCSEL array further comprising:
a third wire electrically connected to the third contact.
14. A vertical cavity surface emitting laser (VCSEL) array, comprising:
a first sub-array includes a plurality of VCSEL units arranged along a first axis, wherein the first sub-array includes:
a first VCSEL unit includes a first Distributed Bragg Reflector (DBR) and a second DBR; and
a second VCSEL unit includes a third Distributed Bragg Reflector (DBR) and a fourth DBR;
a first contact electrically connected to the first DBR and the third DBR; and
a second contact electrically connected to the second DBR and the fourth DBR;
wherein the first DBR and the fourth DBR are doped with a first property,
wherein the second DBR and the third DBR are doped with a second property different from the first property,
wherein a reflectance of the second DBR is greater than a reflectance of the first DBR,
wherein a reflectance of the fourth DBR is greater than a reflectance of the third DBR,
wherein the first VCSEL unit is operated when a first voltage is applied to the first contact and a second voltage smaller than the first voltage is applied to the second contact, and
wherein the second VCSEL unit is operated when the second voltage is applied to the first contact and the first voltage is applied to the second contact.