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  Lesotho Bridal New Fashion Wedding 2025 Jewellery Necklace Set.

By Aamir Mannan.     Wednesday, 15, January, 2025.

The concept of electromagnetic radiation amplification through the mechanism of stimulated emission had already been successfully demonstrated in the laboratory by way of the maser, using other materials such as ammonia and, later, ruby, but the ruby laser was the first device to work at optical (694.3 nm) wavelengths. Maiman's prototype laser is still in working order.[citation needed]