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We present some different kinds of the loss detection technologies of optic path for laser ignition application according to the recommend of reliability and security of the laser ignition system, such as single wavelength and dual wavelength. The factors of loss detection technology are discussed. The difficulty and uptrend of the laser ignition system are pointed out in this paper. The correlation research will be focused on the reliability of optic parts, applicability of environment and special fiber in the future.

Aimed at solving the optical defects of the traditional handled laser-cleaners, such as inhomogeneous power distribution, large caliber, high cost of range-finder and complex control system, the feature of the laser beam is analyzed, the formula of the power average density distribution in the fiber laser-cleaner are discussed, and a new optical shaping method is presented in this paper. In order to regulate the infrared gauss laser beam and redistribute the high density power from the center to the edge, the system simulation utilized a ray tracing method which contains a Kepler telescope system made by two aspherical lenses. As a result, the laser power was compensated and homogenized; the lap joint ratio of laser patch was reduced; and the cleaning speed can be increased. Based on the features of the free-space optical system, the multi-layer optical design method was utilized. The traditional laser range-finder was replaced by the optical focusing design which could clearly point out the best working area, reduce a lot of optic-electronic elements, and simplify the structure of the cleaner’s output-end. On the other hand, this method would not cause any losses of the working laser power. Besides, a visible direction light was added into the invisible infrared working laser for safety.