PRODUCTS
Fe:ZnSe or Iron(Ferrum) doped Zinc Selenide (Fe2+:ZnSe) is arguably one of the most effective crystals used to design lasers in middle (thermal) infrared. As it’s cousin Cr:ZnSe, this crystal exhibits high absorption coefficient which allows efficient pumping. That can be done in range of 2.8 – 4.4 μm, with pumping peak at ~3 μm. Some pumping suggestions bellow:
Pump with Cr:CdSe, Cr:ZnSe lasers
Flash pump using Er:YAG @ 2.94 μm, Er:YSGG @ 2.78 μm
Due to short lifetime of Fe:ZnSe material, 3photon suggest to limit pumping pulses to hundreds of nanoseconds. Ferrum zinc selenide crystal can be tuned and has very wide lasing (emission) range with a peak at approximately 4500 nm (4.5 μm).
Fe:ZnSe crystal acts as saturable absorber (passive modulator) for passive Q-switching.
3photon offers single crystal Fe:ZnSe with or without optical coatings.