Barium Metaborate(BBO)
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Barium Metaborate(BBO)

BBO (beta-BaB2O4) is an excellent non-linear crystal for frequency-doubling (SHG) of Visible and Near IR laser light, OPO/OPG/OPA pumped by ultrafast pulses of wavelengths in the Near IR to UV, and sum-frequency mixing (SFM) into the Visible to the deep UV. BBO is one of the few practical crystal for use below 500 nm in SHG and SFM.

BBO is very good for tunable laser sources, such as ultrafast Ti:Sapphire or dye lasers. And it is also widely used for 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

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Product Description

FEATURES:

Broad phase matchable range from 409.6 nm to 3500 nm;

Wide transmission region from 190 nm to 3500 nm;

Large effective second-harmonic-generation (SHG) coefficient

Wide temperature-bandwidth of about 55℃.

High frequency conversion efficiency (equivalent to 6 times of KDP crystal);  

Good optical uniformity (δ N ≈10-6/cm);  

High laser damage threshold, about 10GW/cm2 (100ps width, 1064nm);  


Crystal Structure

Crystal   Structure

Trigonal,   space group R3c

Cell   Parameters

a   = b = 12.532Ã, c = 12.717Ã…, Z = 6

Melting   point

1095+ 5°C

Transition   temperature

925+ 5°C

Optical   homogeneity

d   n ~ 10-6/cm

Mohs   hardness

4

Density

3.85   g/cm3

Absorption   Coefficient

<   0.1%/cm (at 1064nm)

Specific   heat

490   J/kg/°C

Hygroscopic   susceptibility

low

Thermal   expansion coefficients

a,   4 x 10-6/K; c, 36 x 10-6/K

Thermal   conductivity

Perpendicular   to c, 1.2 W/m/°C
  Parallel to c, 1.6 W/m/°C


Linear Optical Properties

Transparency   range

189-3500   nm

Refractive   indices:

ne =   1.5425, no = 1.6551 @ 1064 nm
  ne = 1.5555, no = 1.6749 @ 532 nm
  ne = 1.6146, no = 1.7571 @ 266 nm

Therm-optic   coefficients

dno/dT   = -9.3 x 10-6/°C
  dne/dT = -16.6 x 10-6/°C

Sellmeier   Equations (l in mm)

no2 (l)   = 2.7359 - 0.01354l2+ 0.01878/(l2-0.01822)
  ne2(l) = 2.3753 - 0.01516l2+ 0.01224/(l2-0.01667)


Nonlinear Optical Properties

Phase-matchable   output wavelength

189   - 1750 nm

NLO   coefficients

d11   = 5.8 x d36(KDP)
  d31= 0.05 x d11
  d22 < 0.05 x d11

Electro-optic   coefficients

y11 =   2.7 pm/V

Half-wave   voltage

48   KV (at 1064 nm)

Damage   threshold


5   GW/cm2 (10 ns) @1064nm
  10 GW/cm2 (1.3 ns) @ 1064 nm
  1 GW/cm2 (10 ns) @532 nm
  7 GW/cm2 (250 ps) @ 532 nm


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non-linear crystal BBO beta-BaB2O4 Barium Metaborate SHG SFM