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Ti:Sapphire Crystals

Ti:Sapphire Crystals

Ti3+ concentration

0.05-0.3 wt.%

Absorption @ 532 nm

>90%

FOM

>150

Aperture dimensions

3 – 50 mm

Length

5 – 30 mm

Crystal orientation

a-cut

Surface quality, S-D

10-5

Transmitted wavefront distortion, P-V

<λ/4 @ 632.8 nm

Configuration

Right angle cut AR coated & Brewster cut uncoated

LIDT

>3 J/cm² @ 800 nm, 200 ps, 10 Hz; >7 J/cm² @ 532 nm, 5 ns, 10 Hz

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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.

 

Features

  • 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.

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