We study the lateral optical confinement effect on the performance and lasing characteristics of GaN-based vertical-cavity surface-emitting lasers (VCSELs). The detector-integrated VCSEL with a movable HCG can n-i-p-i-n achieve three functions, including wavelength tuning, power monitoring, and. LiDAR, or light detection and ranging, is a crucial technology for self-driving cars, robotics, and other applications that require precise depth sensing. However, conventional LiDAR systems face challenges like bulky designs and limited range. The anti-guiding and guiding structures are designed by calculating the effective refractive index difference of active and cladding regions. Vertical-cavity surface-emitting lasers (VCSELs) having a small aperture and operating in a single transverse mode (SM) are known to reach high relaxation oscillation frequencies of 30-90GHz and, thus, can offer intrinsic modulation bandwidth beyond 100GHz, once photon damping and electric. Multijunction vertical-cavity surface-emitting lasers (VCSELs) have gained popularity in automotive LiDARs, yet achieving a divergence of less than 16° (D86) is difficult for conventional extended cavity designs due to multiple-longitudinal-mode lasing. Our innovation, the antireective.