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 Inrad Optics, 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.

 

Material Properties
Chemical Formula ß - Ba2BO4
Crystal Symmetry and Class trigonal, R3c Point Group 3m
Lattice Parameters a = 12.547 Å
c = 12.736 Å
Density 3.85 g/cm3
Mohs Hardness 4.5
Optical Class Uniaxial negative
Transmission Range 0.198 μm – 2.6 μm
Thermal Conductivity κ = 0.08 W/m∙K ( ⊥c )
κ = 0.8 W/m∙K ( ∥ c )
Thermal Expansion
for T = 293 - 1173 K
α11 = 4 x 10-6 /K
α33 = 36 x 10-6 /K
Electro Optic Coefficients
@ 0.633 μm

T: unclamped
S: clamped

r22S = 2.1 pm/V
r22T = 2.5 pm/V

Dimensions

We fabricate and polish BBO crystals in a wide range of standard and custom sizes and orientations. Available lengths range from 50 µm for short-pulse work to 25 mm for nanosecond OPO/OPA use. Crystals are oriented in a double crystal x-ray spectrometer and are accurate to ± 5 minutes.

Finishing

  • BBO crystals are available with a dielectric coating to protect polished surfaces from fogging due to ambient moisture. AR coatings also reduce reflections from polished surfaces, improving transmission quality for all wavelengths.
  • Electrodes for Q-switching
  • Cut at Brewster’s angle
  • Ring mounts compatible with standard optomechanics

Fill out this RFQ form for help in configuring your crystal.

Configuration Options

Designation Angle, θ Operation Input Output
“0” 68.5° SHG 418-464 nm 209-232 nm
THG (600-665 nm) + (300-331 nm) 200-220 nm
“1” 53.2° SHG 454-560 nm 209-232 nm
THG (651-800 nm) + 325-400 nm) 217-266 nm
“2” 37.4° SHG 542-820 nm 271-410 nm
THG (774-1165 nm) + (387-582 nm) 258-388 nm
“A” 78° SHG 410-433 nm 205-216 nm
THG (594-620 nm) + (297-310 nm) 198-206 nm
“B” 55° SHG 448-543 nm 224-271 nm
THG (642-775 nm) + (321-358 nm) 214-258 nm
“C” 65° SHG 423-480 nm 211-240 nm
THG (608-687 nm) + (304-343 nm) 203-229 nm
“TSS” 28.7° SHG 636-1000 nm 318-500 nm
THG (906-2100 nm) + (453-1050 nm) 302-700 nm
“TST” 44° SHG 496-675 nm 248-337 nm
THG (710-960 nm) + (355-480 nm) 237-320 nm
“OPO1” 36.6° SHG 549-844 nm 275-422 nm
THG (784-1200 nm) + (392-600 nm) 262-400 nm
SFM 1064 nm + (510-567 nm) 345-370 nm
“OPO2” 57.5° SHG 440-525 nm 220-262 nm
THG (632-750 nm) + (316-375 nm) 211-250 nm
“M1” 50.2° SFM 1064 nm + (243-340 nm) 198-257 nm
“DGN” 31° SFM 1064 nm + (380-980 nm) 280-510 nm
“IDLR” 20° SHG 1380-1460 nm 690-730 nm
“OPO3” 30° OPO 355 nm 410-2000 nm
“SHG” 22.8° SHG 1064 nm 532 nm
“THG” 31.3° THG 1064 nm + 532 nm 355 nm
“4HG” 47.6° 4HG 532 nm 266 nm
22° SHG 1550 nm 775 nm

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