Laser crystal as the heart of the laser plays a key role. For good performance, you need to have homogenous material with a well-controlled doping level. Shape, dimensions and precision could be adjusted to the needs of resonator design. For microchip lasers, crystals could be coated with HR+HT design to reflect the signal and transmit the pump wavelengths.
Nd:YAG laser crystal is a popular lasing medium for solid-state lasers. It is made of a crystal structure of yttrium aluminum garnet (YAG) doped with neodymium (Nd) ions. Nd:YAG laser crystal is known for its good fluorescence lifetime, thermal conductivity, and robust nature, making it suitable for high power continuous wave, high intensity q-switched, and single mode operation.
• Material : Nd:YAG, Nd:YVO4
• Dimensions tolerance : +/- 0.1 mm
• Surface quality : 10-5 S-D
• Surface flatness : < λ/10 @ 633 nm
• Parallelism error : < 20 arcsec
• AR/AR coatings : R < 0.2 %
*standard specifications