Barium borate (BBO)

Barium borate (BBO) is a versatile nonlinear crystal, suitable for use in harmonic generation operations, optical parametric oscillators, and in electro-optical applications from the near infrared to the deep ultraviolet. Among BBO’s attractive features are it’s large nonlinear coefficients, high threshold for laser damage, and low thermo-optic coefficient.

At here, high quality BBO single crystals are grown using a top seeded solution growth technique. Our in-house growth, fabrication, and finishing provide unparalleled material traceability and process consistency.

Popular applications of BBO include generating the third, fourth, and fifth harmonics of Nd:YAG lasers (355nm, 266nm, and 213nm respectively), the second and third harmonics of Ti:Sapphire amplifiers (400nm and 266.7nm), and a variety of sum frequency mixing schemes using dye lasers. BBO can be used in OPO configurations to generate tunable output in the visible to near infrared range. BBO is also well suited to Q-switching and other electro-optical applications in high power UV laser systems.

BBO crystal has broad tunability, high damage threshold, and high efficiency. BBO’s small acceptance angle requires a very good beam quality and its large walkoff results in output beams that are very elliptical or slit-like. Type I is usually much more efficient than type II operation. BBO can not be used for NCPM (temperature tuned) application.

Typical applications:
  • SHG ,3HG, 4HG and autocorrelation of femtosecond and picosecond Ti:Sapphire lasers;
  • SHG, 3HG, 4HG, 5HG of YAG lasers at 1064 nm and 1320 nm to yield output of 212-660nm;
  • SHG of tunable dye or solid-state laser sources from 410-750 nm to yield output of 205-375 nm;
  • SFM of dye laser and YAG harmonics to yield output of 189-400 nm;
  • DFM (difference-frequency mixing) from the Visible to the IR range up to over 3000 nm;
  • OPO pumped with SHG or 3HG of YAG or Ti:Sapphire with an output range of 400-3000;
  • Intracavity SHG of Argon ion lasers (488, 514 nm) or Copper vapor lasers (510 nm, 578 nm);
  • Used as E-O crystals in pockels cells

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