Abstract
The submillimeter optical properties of hot-pressed polycrystalline boron nitride with a predominantly hexagonal crystal structure were studied at room temperature from ∼20 to 120 cm−1 (λ=500–84 μm) with a Fourier-transform spectrometer. Several grades were studied and probed both parallel and perpendicular to the material’s optic axis. The material was found to behave as a negatively uniaxial birefringent crystal. The birefringence, defined as the difference between the real part of the extraordinary and ordinary indices of refraction (ne–no), was quite large in one case with a value of −0.152. The material’s absorption properties were also studied. For certain grades, a modest dichroism was observed. The low absorption (α<1 cm−1) for grade A at frequencies below 38 cm−1 suggests the possibility for millimeter/submillimeter wave applications. Results are compared with data obtained by other researchers on related materials.
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