APPARATUS INCLUDING LASER SOURCE AND OPTICAL TRAIN, SPECKLE-BASED MOTION SENSOR, OPTICAL MOUSE, COMPUTER SYSTEM, AND METHOD FOR GENERATING AND MODIFYING LASER BEAM

摘要

PURPOSE: An apparatus including a laser source and an optical train, a speckle-based motion sensor, an optical mouse, a computer system, and a method for generating and modifying a laser beam are provided to adjust efficiently divergence of laser by improving a structure of the apparatus. CONSTITUTION: In the device, a Vertical Cavity Surface Emitting Laser(VCSEL)(101) radiates an 850 nm wavelength laser beam along an optical axis(102). A typical VCSEL has an associated divergence angle(125) which is the measured widest angle at which individual rays of the laser beam emit from the VCSEL(101). The divergence angle(125) is defined as the angle at which the optical intensity of the laser beam drops to one-half of the peak, on-axis value. A typical laser beam has a divergence angle of up to about 20.