VersaChrome™ Tunable Filters

Semrock has done it again! These new, game-changing optical filters do what no thin-film filter has ever done before: offer wavelength tunability over a very wide range of wavelengths by adjusting the angle of incidence with essentially no change in spectral performance. VersaChrome filters combine the highly desirable spectral characteristics and two-dimensional imaging capability of thin-film optical filters with the wavelength tuning flexibility of a diffraction grating. They are so innovative, they are patent pending.

With a tuning range of greater than 12% of the normal-incidence wavelength (by varying the angle of incidence from 0 to 60°), only five filters are needed to cover the full visible spectrum. They are ideal for applications ranging from fluorescence imaging and measurements to hyperspectral imaging and high-throughput spectroscopy. With their excellent polarization insensitivity and high optical quality and damage threshold, they are well-suited for a wide range of laser applications as well.

(Left) Transmission spectra at several very high angles for both s- and p-polarization for the TBP01-550/15 filter - note the almost nonexistent polarization dependence.

(Right) Shift of center wavelength with increasing angle of incidence for this filter; the full-width-at-half-maximum (FWHM) bandwidth remains fixed at 20 nm.

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