Similar to the structure of an EEL (edge-emitting laser), the HCSEL horizontally laser cavity uses diffraction optics to form surface light perpendicular to the laser oscillation direction. Usually the operating wavelengths of HCSEL lasers are 920nm, 976nm to 1310nm, etc.
Characteristics of diffractive HCSEL
The divergence angle of the HCSEL laser is divided into two directions: the fast axis and the slow axis. The full angle of the slow axis of the HCSEL is less than 0.5°, which is approximately parallel light, and the full angle of the fast axis divergence is 15°. Therefore, HCSEL laser is a natural line light source.
Through the chip’s built-in DOE coupling output, the HCSEL laser frequency is stable and feedback-proof. The power increase of a single chip can be achieved simply by increasing the chip size and light output aperture. Some of the HCSEL single chip size can be customized from less than 1mm to 10mm, and can be arranged in an array at the wafer level.