AgGaSe₂ (AGSe) Single Crystal
Description
AgGaSe₂ (AGSe) offers broad 0.9–16 µm IR transmission and high nonlinearity, delivering efficient SHG of CO₂ lasers and OPO conversion.
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Technical details
Advantages:
- Broad IR transmission range with useful transmission over 0.9–16 μm.
- Large nonlinear optical coefficient: d₃₆ ≈ 39 pm/V.
- Capable of Type-I and Type-II phase matching for SHG with fundamental wavelengths from approximately 3.1 to 12.8 μm, and wide tunability for optical parametric oscillator (OPO) applications.
- Suitable for CO₂ laser SHG, with demonstrated energy conversion efficiency of 12% for 10.6 μm pulsed CO₂ laser output.
- Non-hygroscopic and chemically stable under normal handling conditions (consistent with the chalcopyrite I–III–VI₂ family).
Typical Specifications:
- Transparency range: 0.71–19 μm (at “0” transmittance level); useful range approximately 0.9–16 μm.
- SHG phase-matching range: fundamental 3.1–12.8 μm.
- Nonlinear coefficient: d₃₆ ≈ 39 pm/V.
- Damage threshold: 10–30 MW/cm² (typical range; depends on pulse width, wavelength, and coating; e.g., >10 MW/cm² @ 10.6 μm, 150 ns; 12–40 MW/cm² reported in various conditions).
- Mohs hardness: 3–3.5.
- Refractive indices (at 10.5 μm): nₒ = 2.5917, nₑ = 2.5585.
- Birefringence: 0.0246 @ 1.06 μm; 0.0332 @ 10.6 μm.
- Optical symmetry: Negative uniaxial (nₒ > nₑ for λ < 804 nm; nₑ > nₒ for λ > 804 nm).
Main Applications:
- SHG of CO₂ laser radiation with demonstrated conversion efficiency of 12%.
- Optical parametric oscillators (OPOs) pumped by Ho:YAG (2.05 μm), Ho:YLF (2.05 μm), or Nd-based lasers (1.34 μm); tuning ranges including 2.65–9.02 μm and 2.5–12 μm have been achieved.
- DFG and SFG for producing tunable mid-IR radiation.
- Parametric amplification in the mid-IR region, particularly for high average power applications.