A team of scientists from Germany has developed a compound. Green laser pointer can be turned into white light. The team is led by Professor Rosemann of the University of Marburg. The compound was designed with tin and sulfur, has a diamond-like structure, and is then supported by organic ligands to support the encapsulation. "The compound is made into a fine amorphous powder," said Professor Rosemann and his collaborators. This compound is non-volatile. Air and thermal stability. Good thermal stability up to 572 degrees Fahrenheit.
The compound core consists of inorganic nanocrystals. The surface is coated with organic ligands. They explained. When the direct near-infrared laser beam passes through the compound. Its unique structure will change the beam wavelength through non-linear interaction, and the outgoing beam becomes visible light. "The visible spectrum is similar to the 2900K tungsten halogen lamp color, but still maintains excellent beam divergence," the researchers said.
The new compound emits wide-band light that is close to the excited state of the infrared green laser pointer and still has good directivity, which can meet the requirements of high spatial resolution of the microscope or high throughput of the projection system. "This progress will open up a new path for direct lighting technology. In particular, the system's material cost is low. Easy to obtain. It has strong scalability.
In basic lasers, a cavity called a cavity is designed to internally reflect infrared (IR) waves, light waves, or ultraviolet (UV) waves to enhance each other. The cavity may contain gas, liquid or solid. The choice of cavity material determines the output wavelength. There is a mirror at each end of the cavity. The mirror is totally reflective and does not allow energy to pass through; the other mirror is partially reflective, which allows it to reach about 5% of energy. Energy is introduced into the cavity from an external source; this is called pumping.