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Why is the wavelength of light used to read data on DVD's smaller than the minimum pit length? - Quora
PDF] A Laser Coupler for DVD/CD Playback Using a Monolithic-integrated Two-wavelength Laser Diode | Semantic Scholar
Nichia And Sony Co-Devrlop New Dual Wavelength Laser Coupler Device Compatible With Red And Blue-Violet Lasers | Products | News Room | NICHIA CORPORATION
China Dvd Laser Diode, Dvd Laser Diode Manufacturers, Suppliers, Price | Made-in-China.com