Archive for microwave

You are browsing the archives of microwave.

Print Your Own Invisibility Cloak

Duke University researchers are using 3D printers to produce working microwave cloaking materials. They suggest it’s not a difficult step to move toward printing with polymers or glass that might cloak visible light. Do-It-Yourself Invisibility with 3-D Printing – [duke.edu] Seven years ago, Duke University engineers demonstrated the first working invisibility cloak in complex laboratory […]

1953 – MASER

In 1953, Townes, Gordon and Zeiger built the first MASER (Microwave Amplification by Stimulated Emission of Radiation). It worked by stimulating ammonia to produce a coherent beam of microwave radiation. A few years later, the same principle was extended to create the first LASER which emitted coherent light. PRECURSOR: 1917 – quantum radiation theory (Einstein) […]

Microwave Starwisp Sails

Robert Forward was a physicist, an aerospace engineer, an inventor, a science writer and a science fiction author. In 1985, he published an idea to create ultra-light interstellar probes that used microwave beamed power sails for propulsion. Freeman Dyson had pointed out to him that microwaves could use a sail with a much larger grid […]

1960 – Laser

In 1960, Theodore Maiman operated the first LASER (Light Amplification by Stimulated Emission of Radiation) using a small ruby rod, a flashlamp from a camera and a power supply. PRECURSOR: 1873 – electromagnetic waves 1888 – microwaves (Hertz) 1913 – quantum theory 1917 – quantum radiation theory (Einstein) 1917 – radar principles (Tesla) 1934 – […]