Specifications

  • Type
    Laser Line Bandpass Filter
  • Surface Quality
    80-50 scratch-dig
  • Thickness
    7.6 mm
  • Size Tolerance
    +0/-0.5 mm
  • Temperature Range
    -50 to +80°C
  • Wavelength Shift with Temperature
    <0.02 nm/°C
  • Humidity Resistance
    Per MIL-STD-810C, method 507, aggravated conditions, modified for 5 cycles

Features

Excellent Out-of-Band Blocking

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.

Sensitivity to Angle of Incidence

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: λθ= λo [1-(no/ne)2 sin2θ]1/2 where λθ 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.

Excellent Temperature Stability

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.

Optical Filter Mounts