Self-Frequency-Doubled Crystal Laser Light Sources and its Potential Applications in Automotive Lighting

With the rapid development of informatization and intelligentialize of vehicles, solid-state-lighting is becoming more and more important in automotive lighting. LED still have some problems in lighting, such as low light intensity, thermal attenuation and short projecting distance. Laser lighting is becoming one of substitutes as the light source for automotive lighting. Here, laser light sources based on self-frequency-doubled (SFD) crystal were investigated. Especially for white laser light source, a mockup was made to verify the realistic of this approach, and the test results showed that the SFD white laser light source, combined with a blue laser diode and an SFD amber laser light source, was obtained successfully. The tested white laser light source's proportion of blue and amber is 1 (440nm): 1.7 (570nm), with a total output optical power 4W. In addition, a road projection lamp based on SFD green laser, compared with LED light source at same output optical power level, mock-up sample's were made and tested to further verify the feasibility of SFD laser applied on automotive lighting, and the optical simulation and test results were also demonstrated. Results show that SFD laser light source will play an important role in the future lighting market for automotive.