Titaniumsapphire

Titaniumsapphire, commonly written as Ti:sapphire, refers to a synthetic crystalline material produced by doping titanium ions into a high-purity sapphire host (aluminum oxide, Al2O3). It is widely used as a laser gain medium because of its extremely broad emission spectrum and strong optical quality, enabling tunable and ultrafast laser operation.

In Ti:sapphire crystals, Ti3+ ions substitute for some Al3+ sites in the corundum lattice. The crystals are grown by established methods such as the Czochralski process or other high-purity crystal growth techniques, producing large single crystals suitable for laser rods. The doping level is carefully controlled to balance absorption, emission, and thermal management.

Ti:sapphire exhibits a broad fluorescence bandwidth, enabling tunable lasing typically from roughly 680 to 1100 nanometers. When pumped with a visible laser, often at 532 nm from a frequency-doubled Nd:YAG laser, the material produces ultrashort pulses, with repetition rates suitable for research and industry. The crystals have good thermal conductivity for a solid-state medium and are relatively resistant to laser-induced damage at appropriate operating conditions.

Applications include ultrafast, femtosecond and picosecond lasers for spectroscopy, microscopy, and materials processing. Ti:sapphire remains a standard in laboratories for tunable, short-pulse laser systems, though it competes with other laser gain media for specific wavelengths and power levels.