Temperature Dependence of the Center Wavelength of Narrow Band Filters Made of AgGaSe<SUB>2</SUB>, CuGaS<SUB>2</SUB> and CuAlSe<SUB>2</SUB>

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The temperature tuning of filters made of AgGaSe2, CuGaS2 and CuAlSe2 is investigated in the temperature range of 77 K∼520 K. The center wavelength of the CuGaS2 filter moves monotonically toward a longer wavelength with temperature from 633 nm to 661 nm, while that of the CuAlSe2 filter moves from 528 nm to 544 nm. The AgGaSe2 filter exhibits a small temperature dependence near room temperature. Its center wavelength shifts from 820 nm at 77 K to 811 nm at 350 K and from 811 nm at 400 K to 814 nm at 520 K. The dependence of the center wavelength on the lowest band gap and the anisotropy in transition strength is discussed.

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