Our laser line bandpass filters cover most of the common laser lines and feature excellent out-of-band blocking of less than 0.01% (10^-4). The highly reflective side of the filter should generally face the source, minimizing the thermal load on the blocking glass and epoxies.

An increase in the angle of incidence causes a shift of the center wavelength to shorter wavelengths. This can be very useful in tuning a narrowband filter to a desired wavelength. The wavelength shift with angle of incidence, can be calculated by: λ_θ= λ_o [1-(n_o/n_e)² sin²θ]^1/2 where λ_θ is the wavelength at the new angle of incidence; λ_o is the center wavelength; n_o is the index of refraction of the environment (n_o = 1 in air); n_e is the effective index of refraction of the filter; and θ is the angle of incidence.

The center wavelength shifts linearly with temperature less than 0.02 nm/°C. The wavelength shifts in the direction of the temperature change. In use, the highly reflective side of the filter should generally face the source, minimizing the thermal load on the blocking glass and epoxies.

We offer a wide variety of optical filter mounts for securing and locating your optical filter.  Popular types include:

• Edge Grip Clamp Filter Mounts
• Spring Clamp Filter Holders
• Indexed Optical Filter Wheels
• Stackable Optical Filter Mounts
• Flip-up Optical Filter Mounts