Abstract
Laser-based displays have attracted much attention owing to large-size screen and full-color gamut compared with other displays such as liquid crystal display and light emitting diode. However, there exists a phenomenon, speckle, limits the applications of laser display because of the high coherence of laser. In this work, we developed an electrically injected 6xx nm dual-emitter laser which combines the low-spatial coherence with the high-power. The output power of the dual-emitter laser exceeds 500 mW under 20?C pulse operation. The single emitter consists of D-shaped section used to obtain more independent spatial modes thus reduces coherence and a stripe area to obtain the high power. The radius of the D-shaped cavity is 500 μm and the length of stripe is 1000 μm. We used the standard photolithography and inductively coupled plasma (ICP) process to fabricate the device. The speckle contrast was measured to be 5%. It exhibits a great potential of reducing speckle from the source directly for laser display.
Highlights
IntroductionLaser-based displays have attracted much attention and a bright prospect, because the laser is the only light source that produces saturated primary colors that reach over 90% of what our eyes can see, in another word, big gamut [1] and the laser display can realize the larger screen
We developed an electrically injected 6xx nm dual-emitter laser which combines the low-spatial coherence with the high-power
Laser-based displays have attracted much attention and a bright prospect, because the laser is the only light source that produces saturated primary colors that reach over 90% of what our eyes can see, in another word, big gamut [1] and the laser display can realize the larger screen
Summary
Laser-based displays have attracted much attention and a bright prospect, because the laser is the only light source that produces saturated primary colors that reach over 90% of what our eyes can see, in another word, big gamut [1] and the laser display can realize the larger screen. To decrease the speckle effect fundamentally, we have to realize the low-spatial coherence of the light source. The random laser and degenerate cavity cannot realize the electrical injection and the compact size. We recently demonstrated that the electrically injected random lasing based on disordered photonic crystal structures [9] and the low-spatial coherence electrically injected red-emitting semiconductor laser [10]. We will present latest results of new low-spatial coherence 6xx nm dual-emitter for relative high power. The speckle contrast is measured to be 5% in the same way in [11]
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