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Matching Laser Diodes and Filters

Matching laser diodes and filters for optimal performance and lower manufacturing costs.

laser-diode-filter-matching

The output of laser diodes for rangefinding and optical communications typically exhibit significant wavelength tolerances, often greater than +/- 5 nm. This can lead to poor performance when paired with the high- precision narrow (< 10 nm) bandpass or notch filters required for accurate detection using photodetectors such as avalanche photodiodes. The wider the laser tolerance, the more likely it is that signal will be lost outside the filter’s precise bandwidth. The output wavelength of the laser diode is also highly dependent on detector temperature and operating current.

To address these issues, Omega Optical has developed dielectric filters with high-temperature coefficients that will shift with the laser diode to maintain peak transmission of the laser output, and introduced a program that pairs individual laser diodes with a matching narrow bandpass or notch filter. By characterizing, sorting, and pairing laser diodes and filters, we can improve your signal to noise ratios for optimal performance in laser applications. This fine-tuning also typically enables higher performance with lower manufacturing costs than specifying tighter laser diode tolerances.

Omega Optical also offers a new line of athermal narrowband filters with reduced angle sensitivity that can be matched with laser diodes for maximum efficiency.

Laser measured transmission for two laser line bandpass filters at 0° and 5° AOI presented on a logarithmic scale to emphasize optical density. The black lines are the C-band laser lines ITU 31 and 37. Laser measured transmission for two laser line bandpass filters at 0° and 5° AOI presented on a logarithmic scale to emphasize optical density. The black lines are the C-band laser lines ITU 31 and 37.

automated-plate-spectroscopy-smCharacterizing and sorting filters can be accomplished using our proprietary system of automated spectral/spatial scanning for high-volume filter plates. Configuration and binning of filters is automatically calculated and mapped by Omega’s software in preparation for matching with the laser.

Please contact us for more information on pairing laser diodes and filters for your application.

Technical Data Sheet

Key Features

  • Improved application performance with individually matched laser diodes and filters
  • Matching narrow bandpass or notch filters where precise transmission or blocking of the laser is critical
  • Automated spectral characterization, configuration, and sorting of filters
  • Athermal, reduced angle sensitivity narrowband filters for maximum efficiency

Applications

  • Laser Cleanup
  • LIDAR
  • Optical Communications
  • Rangefinding
  • Remote Sensing