# Optical Design for Laser Diode Scanner Headlamp with
###### Abstract  
The illumination optical system using a laser diode has advantages such as small size and high efficiency compared to an optical system using a conventional light source. In particular, its advantages can be maximized in high-resolution spatial light modulation. Based on these advantages, research to apply laser diode scanning to high-resolution adaptive driving beam (ADB) is currently being actively conducted. To construct a high-resolution illumination optical system for an ADB system using a single laser diode as a light source, the configuration of an optical scanning system is essential. In the general high-speed scanning method, the optical power at the center is relatively smaller compared with that at the edge because of the faster scanning speed when the center is illuminated. This causes large losses in automotive lighting optical system where the optical power in the center should be higher. Herein, we propose an optical system that can change the light power distribution of the center and the edge by applying a prism. In addition, by producing a prototype of an optical scanning system, the effect of efficiently distributing optical power by the designed optical scanning system was experimentally verified. laser scanner headlamp; adaptive driving beam; optical scanning system +
Footnote †: journal: Applied Sciences  
**Citation:** [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON] Optical Design for Laser Diode Scanner Headlamp with Efficiently Distributed Optical Power for Adaptive Driving Beam System of Automobiles  
**Citation:** [PERSON]; [PERSON]; [PERSON]; [PERSON] [PERSON] Optical Design for Laser Diode Scanner Headlamp with Efficiently Distributed Optical Power for Adaptive Driving Beam System of Automobiles  
**Citation:** [PERSON]; [PERSON]. more than twice that of LED-based headlamps. Therefore, laser diode-based headlamps offer many advantages, motivating many automobile manufacturers to develop laser diode-based headlamps. In September 2013, BMW officially announced mass production of the i8 model with a new type of laser-based headlamp. Subsequently, BMW will apply laser-based headlamps to other models [8; 9]. Vehicle headlamps were developed to improve the safety of the driver on the road. The adaptive front lighting system, which enables cornering lights, has been known for nearly a decade but has only been available since 2006. The matrix headlamp system developed by Audi is a technology that illuminates by controlling a wide range of lights at low driving speeds. In addition, this technology narrows the lighting area when driving at high speeds and increases the lighting intensity such that it can illuminate farther away [10]. In addition, when the adaptive driving beam (ADB) function is applied, a high beam is switched to a low beam or turned off by recognizing oncoming traffic and preceding traffic using a camera integrated in the vehicle, thereby preventing glare from other drivers. The ADB function can be implemented in an LED-based headlamp by organizing the headlamps via arranging 50 to 100 LEDs that can be individually controlled to individually process-specific parts of the light distribution. As this type of LED-based headlamp uses many LEDs, more power sources and larger heat-sinks are required. In addition, the spatial resolution of the area that illuminates the headlamp is limited only by the number of LEDs. Therefore, a pixelated system was proposed to overcome this disadvantage [11]. The pixelated system is a technology that illuminates a road in a manner similar to an optical projector, as shown in Figure 1. As it can manage thousands of pixels or more, it can maintain a higher lighting resolution than LED-based headlamps arranged in a matrix and can be designed to a smaller size as it is implemented with fewer light sources than LED-based headlamps. The scanning optics of the pixelated system typically involves a small micromirror, such as an MEMS mirror with two rotational degrees of freedom [12; 13].