These first lasers were made of gallium aluminium arsenide (GaAlAs) and operated at a wavelength of 0.8 μm. In 1976, the first optical transmission system was put into service, operating over 11 ...

“The upper tandem solar cell is made of gallium indium phosphide (GaInP) and aluminum gallium arsenide (AlGaAs), which was bonded by Soitec onto a lower tandem solar cell made of gallium indium ...

The reflector was optically optimized through a combination of ceramic and silver and the cell's absorber was based on nitrogen-doped gallium arsenide and p-type aluminum gallium arsenide.