Fe:ZnSe – Ferrum doped zinc selenide

Electro-optics

Fe:ZnSe (iron-doped zinc selenide) is a mid-infrared laser crystal that provides broad tunable emission around 3.4–5.2 μm with high efficiency, making it useful for compact laser systems, spectroscopy, and sensing applications.

Fe:ZnSe (iron-doped zinc selenide) is a highly effective mid-infrared laser crystal with a high absorption coefficient and broad gain bandwidth, capable of efficient pumping around 3 μm and tunable emission across roughly 3.4–5.2 μm, making it widely used in compact laser systems, optical parametric oscillators, spectroscopy, and medical or sensing applications, while also serving as a saturable absorber for passive Q-switching and operating efficiently even at room temperature despite its relatively short excited-state lifetime requiring short pump pulses.

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Evermind™ template is crafted like sustainable structures — clean, scalable, and built to last.

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3photon (three-photon) specializes in the design and commerce of laser and non-linear crystals, as well as optical components, while also operating advanced optical coatings and polishing facilities.

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What is the tunable emission range of Fe:ZnSe?

Fe:ZnSe provides tunable mid-infrared emission across approximately 3.4 to 5.2 um, making it one of the broadest tunable mid-IR gain media available.

How is Fe:ZnSe typically pumped?

Fe:ZnSe is efficiently pumped around 3 um, compatible with Er:YAG or HF laser pump sources due to its high absorption coefficient at that wavelength.

Can Fe:ZnSe operate at room temperature?

Yes. Fe:ZnSe can operate efficiently even at room temperature, although cooling improves performance by reducing thermal quenching of the upper laser level.

What is Fe:ZnSe also used for beyond lasing?

In addition to being a gain medium, Fe:ZnSe serves as a saturable absorber for passive Q-switching of mid-IR lasers, particularly those operating around 3 um.