Effect of focal shift on reflecting character of “cat eye effect”

In order to study the laser reflected character of "cat eye effect" of the target's optical system when the reflecting apparatus on the focal plane is focal shift,modeling and simulation for the "cat eye" aim were carried out by using the optical design and analysis software named ZEMAX.Adopting the above method,the reflecting characters were obtained including the energy transit ratio when the incident laser through the "cat eye" aim,the far field divergence,the far field facula and the energy distributing character of the back reflecting laser.Then the different effect from positive and negative focal shift on reflecting character was put forward.At last,the angle range of the incident laser beam was obtained which is necessary for the back reflecting beam of "cat eye effect" when the target optical system is focal shift.The results show that the size of focal shift has a decisive effect on the back reflecting light's characteristic,especially its far field light's intensity.These results provide reliable evidence for the analysis of detecting ability of the active laser detecting system.