Fe:ZnSe – Ferrum doped zinc selenide
Absorption 2.8 μm – 4.4 μm | Emission 3.4 μm – 5.2 μm
Fe:ZnSe, or iron (ferrum) doped zinc selenide (Fe²⁺:ZnSe), is considered one of the most effective crystals for designing lasers in the middle (thermal) infrared range. Like its cousin Cr:ZnSe, this crystal has a high absorption coefficient, enabling efficient pumping in the 2.8–4.4 μm range, with a pumping peak around ~3 μm. Suggested pumping methods include:
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- Pumping with Cr:CdSe or Cr:ZnSe lasers
- Flash pumping with Er:YAG @ 2.94 μm or Er:YSGG @ 2.78 μm
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Due to the short lifetime of Fe:ZnSe material, 3photon recommends limiting pumping pulses to hundreds of nanoseconds. This crystal can be tuned and has a broad lasing (emission) range with a peak at approximately 4500 nm (4.5 μm).
Fe:ZnSe also functions as a saturable absorber (passive modulator) for passive Q-switching.
3photon offers single crystal Fe:ZnSe with or without optical coatings.
- Features
- Applications
- Applications in lasers
- Growing
- High absorption coefficient
- Cubic structure
- Sizes up to 40 x 40 x 50 mm
- Emission range: 3.4–5.2 µm
- Extensive gain bandwidth: >500 nm
- Efficient operation at room temperature
- Available in various dopant concentrations
- Gain material in compact laser systems
- Passive Q-switch for 2800–3400 nm lasers
- Pump source for mid-infrared (MIR) optical parametric oscillators (OPO)
- Spectroscopy
- Infrared (IR) missile countermeasure systems (ship- and aircraft-based)
- Free-space communications
- Gas tracing and analysis
- Non-invasive medical diagnostics
- Non-invasive medical diagnostics;
- Medical surgeries
- Cavity ring-down (CRD) spectroscopy
Fe:ZnSe crystals, considered among the best for middle infrared (MIR) applications, are typically used in:
- Continuous wave (CW) Fe:ZnSe lasers, which can be tunable or fixed
- Gain-switched (pulsed) Fe:ZnSe lasers, available in fixed or tunable configurations
- Free-running Fe:ZnSe lasers
Most iron-doped zinc selenide (Fe:ZnSe) is grown using chemical vapour deposition (CVD) technology, producing poly-crystalline material.
3photon, however, uses alternative methods to produce single-crystal Fe:ZnSe.
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