Custom Gain chip - Inphenix Inc. https://www.inphenix.com/en/gain-chip/ #Gainchip is identical to laser diode chips except that they have a deep anti-reflective coating on one or both facets, which raises or eliminates the threshold of self-lasing. Gain Chip is used as a gain medium for Single FBG Lasers or Externally Tunable Cavity Lasers. Inphenix offers standard gain chip per our datasheet requirements as well as custom gain chip. The broadband gain chip is a #superluminescentdiode that serves as both a broadband light source and a frequency-agile gain medium, is at the heart of the external-cavity laser.