title: Recent progress in improving low-temperature stability of infrared thin-film interference filters.
abstract: The degeneration of performance of an optical thin-film interference filter associated with the change of temperature is not acceptable. In this letter, we report a new progress in improving low-temperature performance of infrared narrow-band filters by using Pb(1-x)Ge(x)Te initial bulk alloy with appropriate Ge concentration x. It can be found that there exists a critical temperature for the investigated narrow-band filter, at which the temperature coefficient of filter is exactly zero. Therefore, by means of controlling the composition in (Pb(1-x)Ge(x))(1-y)Te(y) layers, the temperature coefficient of filter can be tunable at the designated low-temperature. In our present investigation, when temperature varies from 300 to 85 K, a shift of peak wavelength of 0.05935 nm.K-1 has been achieved.
authors.forename: B
authors.initials: B
authors.lastname: Li
authors.forename: S
authors.initials: S
authors.lastname: Zhang
authors.forename: J
authors.initials: J
authors.lastname: Jiang
authors.forename: D Q
authors.initials: DQ
authors.lastname: Liu
authors.forename: F
authors.initials: F
authors.lastname: Zhang