In this paper, we proposed a miniature auto-focus image system without moving components. We had previously
presented a 2-Mega-Pixel auto-focus module by combining reflective optics, refractive optics and MEMS
deformable mirror. This configuration can be further improved. We expanded 2-Mega-Pixel image plane to 8-Mega-Pixel image plane and corrected the aberration by adding one more lens as a stop. For the concern of the
cost, we distributed the optical power of the adding lens to the fixed reflecting mirror and the deformable mirror,
and we designed them as freeform surfaces to compensate aberrations. Finally, an 8M pixel auto-focus image
system that FOV is ±26° can be achieved. The MTF at half spatial frequency is above 25% , and the thickness of
the system is 8.2mm.
The effects of phonon bottleneck effect on the performance of QD laser devices are studied using the rate equation model. Due to phonon bottleneck effect, simultaneous laser oscillations of ground state and excited state can occur. By comparing experimental data and theoretical prediction, the estimated value of intra-dot relaxation time is more than 100ps.