Laser Line Filters

At the laser source, while output is typically thought of as monochromatic and is described by a prominent line and a single output wavelength, there are often lower level transitions, plasma, and “glows” all of which create background errors. In addition, laser sources can shift in wavelength depending on power, temperature, and even manufacturing tolerances. Transmitting pure excitation energy requires a laser “clean-up” filter to control the unwanted energy.

Laser line filters are narrow bandpass filters centered on the resonance of the laser, which attenuate the background plasma and secondary emissions that often result in erroneous signals. In the case of diode lasers and LEDs, these filters can be used to make the light output more monochromatic. In the case of gas lasers, these filters can eliminate plasma in the deep blue wavelength region. Laser line filters provide 60 - 90% throughput (except UV) with spectral control from 0.85 to 1.15 of the CWL. An accessory blocker can be ordered to control a much wider spectral range from the deep UV to the IR. This additional blocker results in a minor loss of throughput (<20%).

View laser line filters

All laser filters are designed with high laser damage thresholds of up to 1 watt/cm2.