Ti:Sapphire crystals (Al2O3:Ti3+) are used in ultrashort pulse and wavelength tunable lasers.
Ti:Sapphire crystals are unique in enabling an extremely broad lasing range from 660 to 1050 nm. They allow pulse energies of ~1 J from 1 cm² of material and average powers that are suitable for many applications. Their indefinite stability and short lifetime make Ti:Sapphire lasers suitable for a variety of applications, spanning from OPA pumping to time–resolved spectroscopy and multi-photon microscopy. Some studies have showed that diode pumping using a blue diode (445 nm) can also be used to make Ti:Sapphire oscillators, which would allow the next generation of Ti:Sapphire lasers.
Altechna offers Ti:Sapphire crystals precisely cut from a boule of large monocrystal. The crystal is grown using the horizontally directed crystallization method (HDCM). The figure of Merit (FOM) > 150 is achieved for the annealed crystals.
Ti:Sapphire crystals have polarization-dependent absorption. π polarization (with an electrical vector parallel to the crystallographic axis c) is preferred because it has a larger absorption at pump and lower absorption at lasing wavelengths. We offer Ti:Sapphire crystals with AR coatings optimized for 532 nm or 800 nm, as well as Brewster-cut crystals to minimize reflection losses. The titanium concentration is typically such that absorption at 532 nm is >90%, but other absorption values are possible.
- Crystals with sizes up to 50 x 50 x 30 mm
- Homogenous WFD with no sharp changes in wavefront
- Shapes as per request: circular; rectangular; right-angle or Brewster-cut
- Custom coatings available for maximum LIDT and/or minimum reflectivity
Altechna offers Ti:Sapphire crystals precisely cut from a boule of large monocrystal. The crystal is grown using the horizontally directed crystallization method (HDCM), which includes the following steps:
- melting of Al2O3 with Titanium in a horizontal boat-shaped container
- inserting a seed crystal to the melt
- pulling the crystal out of the melt in a highly controlled environment
- cooling down the boule in a strict thermal regime
- annealing the boule under strongly reducing atmosphere to maximize Ti3+ ions, since Ti4+ ions increase absorption in the infrared (800 nm) region, which decreases the Figure Of Merit (FOM). FOM is defined as a ratio between absorption at 515 nm and absorption at 800 nm. The figure of Merit (FOM) > 150 is achieved for the annealed crystals.