Laser line filters are ideal for transmitting laser light while suppressing ambient light. The center wavelength shifts linearly with temperature less than 0.02 nm/°C.
The highly reflective side of the filter should generally face the source, minimizing the thermal load on the blocking glass and epoxies.
Our filters have excellent out-of-band blocking, 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.
Wavelengths range from the ultraviolet to the near infrared, covering most of the common laser lines. 12.7 and 25.4 mm diameter filters are available in most wavelengths. They are mounted in a black anodized aluminum housing to protect the filter from humidity and handling.
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 = Λo [1-(no/ne)2 sin2θ]1/2Where Λ is the wavelength at the new angle of incidence; Λo is the center wavelength; no is the index of refraction of the environment (no = 1 in air); ne 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.