What was predicted by Valentin Fabrikant in 1939?

• A. Development of the MASER
• B. Use of stimulated emission to amplify light
• C. Invention of the first working LASER
• D. Creation of traffic LIDAR systems

Answer: (B)

Valentin Fabrikant accurately predicted the use of stimulated emission to amplify light in 1939, a concept central to the operation of both MASERs and LASERs. His foresight into this process ultimately laid the groundwork for the technological advancements that followed, including the development of these critical devices. By recognizing the potential of stimulated emission, Fabrikant contributed to the understanding of how light can be amplified, leading to various applications in both scientific and commercial fields. This prediction is significant as it highlights an essential principle that underpins modern optical technologies. The other options, while related to advancements in light amplification, are either consequent developments or specific inventions that emerged after Fabrikant's original prediction regarding stimulated emission.