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Fe2+:ZnSe and Fe2+:ZnS saturable absorbers (SA) are ideal materials for passive Q-switches of solid-state lasers operating in the spectral range of 2.5-4.0 µm.
These lasers (e.g. 3.0 µm Er:YAG/YSGG/YLF are used for pumping middle-infrared Optical Parametric Oscillators and for numerous medical and dental applications.
IPG’s fabrication process allows low cost mass production of a very large variety of diffusion-doped Fe2+:ZnSe/Zns crystals with low losses, uniform distribution of iron, good reproducibility and reliability.
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Samples of Fe2+:ZnSe Single and Polycrystalline Saturable Absorbers
 Passive Q-Switch Fe2+:ZnSe Datasheet
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| Crystal |
Peak Coefficient Absorption, cm-1 |
Upper Level Lifetime
at 300 K, µs |
σGSA at
2.8 µm, 10-20 cm2 |
σgsa/σesa |
σgsa/σYSGG |
| Fe:ZnSe |
1-20 |
0.37 |
90 |
0 |
30 |
| Fe:ZnS |
1-20 |
<0.3 |
130 |
0 |
43 |
According to the criterion for saturable absorber Q-Switching
Fe:ZnSe/S can be used as a saturable absorber Q-Switch for the Cr:Er:YSGG laser without intracavity focusing.
Output energies of 15 and 85 mJ were achieved in single and multipulse modes of operation, respectively.
The combination of a high values of saturation cross-sectio, small saturation energy with good opto-mechanical (damage threshold - 2 J/cm2) and physical characteristics of ZnSe and ZnS hosts make Fe2+:ZnSe/S crystals an ideal material for passive Q-Switching of mid-infrared laser cavities.
Contact IPG Photonics for more information