LASER ACTIVE CRYSTAL: Cr:YAG
LASER ACTIVE CRYSTAL: Cr:YAG
Description
Cr:YAG, or chromium-doped yttrium aluminum garnet, is a laser active crystal that is commonly used in solid-state lasers. Cr:YAG has a cubic crystal structure and is doped with chromium ions, which allow it to amplify light through stimulated emission.
One of the main advantages of Cr:YAG as a laser active crystal is its ability to generate laser emissions at a wavelength of 1064 nanometers, which is the same as Nd:YAG lasers. However, Cr:YAG lasers have several advantages over Nd:YAG lasers, such as a wider absorption bandwidth and a higher efficiency for generating short pulses.
Cr:YAG lasers are typically pumped by a flashlamp or a diode laser, which excites the chromium ions in the crystal and causes them to emit light at a longer wavelength. Cr:YAG lasers can also be mode-locked, which allows them to generate ultra-short pulses in the picosecond or femtosecond range.
Cr:YAG lasers are used in a variety of applications, such as laser marking, welding, and cutting of metals and ceramics. They are also used in scientific research, particularly in the field of ultrafast laser spectroscopy.
| Mechanical Properties | |
| Mohs hardness | 8.5 |
| Thermal conductivity, W x °K-1 x cm-1 | 0.12 |
| Termooptical factor (dn/dt) | 8.0 x 10-6 x °K-1 |
| Spectral Properties | |
| Operating transition | 3A2 - 3T2 |
| Absorption band, nm | 900 - 1150 |
| Emission band, nm | 1340 - 1580 |
| Dopant level, at/cm3 | 1017 - 1018 |
| Damage threshold at 1064 nm, 10 ns, MW/cm2 | 500 |
| Upper-level lifetime at 300°K, ms | 3.6 |
| Quantum yield at 300°K, % | 12 |
| Absorption cross section at 1064 nm, cm2 | 5.0 x 10-18 |
| Emission cross section at 1420 nm, cm2 | 4.5 x 10-19 |
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