Suppressed speckle contrast of blue light emission out of white lamp with phosphors excited by blue laser diodes for high-brightness lighting applications |
| |
Authors: | Junichi Kinoshita Yoshihisa Ikeda Yuji Takeda Misaki Ueno Yoji Kawasaki Yoshiaki Matsuba Atsushi Heike |
| |
Institution: | 1. R&D Center (Imabari Complex), Toshiba Lighting & Technology Corporation, Imabari, Ehime, 794-8510, Japan
|
| |
Abstract: | The speckle contrast of blue light emission out of high-brightness white lamps using phosphors excited by InGaN/GaN blue laser diodes is evaluated as a measure of coherence. As a result, speckle contrast of as low as 1.7%, the same level as a blue light emitting diode, is obtained. This implies that the original blue laser light can be converted into incoherent light through lamp structures without any dynamic mechanisms. This unique speckle-free performance is considered to be realized by multiple scattering inside the lamp structure, the multi-longitudinal mode operation of the blue laser diodes, and the use of multiple laser diodes. Such almost-incoherent white lamps can be applied for general lighting without any nuisance of speckle noise and should be categorized as lamps rather than lasers in terms of laser safety regulation. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|