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Non-linear Crystal Lithium Tetraborate (Li2B4O7 or LTB)
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Lithium Tetraborate
Lithium Tetraborate (Li2B4O7 or LTB) has attracted much attention as a newly developed single crystal which has potential application to surface acoustic wave (SAW) devices. It is characterized by a low-temperature coefficient of the delay time, high electro-mechanical coupling constant and large piezoelectric constant.

APPLICATIONS:
• Harmonic generation (SHG, THG, 4HG, 5HG) of YAG lasers
• High power ultraviolet light source based on SHG and SFH of the visible laser radiation
• In BAW and SAW devices

Literature:
 • V. Petrov, R. Komatsu and T. Sugawara. Temperature tuned noncritical phase-matching in Li2B4O7 for generation of cw laser radiation at 244 nm. Electron. Lett. 35 (1999) 721-2
 • R. Komatsu, T. Sugawara, N. Watanabe, S. Uda and V. Petrov. Growth and UV nonlinear properties of optical-grade lithium tetraborate (Li2B4O7) crystals. The Review of Laser Engineering 27 (1999) 541-6
 • V. Petrov, F. Rotermund, F. Noack, R. Komatsu, T. Sugawara and S. Uda. Vacuum ultraviolet application of Li2B4O7 crystals: generation of 100 fs- pulses down to 170 nm. J. Appl. Phys. 84 (1998) 5887-92
MAIN PROPERTIES:

Transparency range, µm 0.16 - 3.6
Point group 4mm
Space group I41cd
Lattice parameters, Å a = 9.479; c = 10.297
Density, g/cm3 2.44
Mohs hardness 4.5
Refractive indexes:
at 266 nm no = 1.6664; ne = 1.6031
at 532 nm no= 1.6139, ne = 0.5564
at 1064 nm no = 1.5980, ne = 1.5432
Non-linear coefficient, pm/V d31 = 0.12
Walk off 1.9° at 532 nm
Temperature acceptance, °C x cm 3.5
Angle acceptance 1.52° x cm1/2
Temperature SHG tuning (Δ λ/Δ T) 9.3 x 10E-3 nm/°C
Dielectric constant ε11T/ε0 = 82.61; ε11S/ε0 = 78.80;
  ε33T/ε0 = 87.92; ε33S/ε0 = 71.45;
Thermal expansion coefficient a11 = 11.1 x 10-6 x °K-1; a33 = 3.74 x 10-6 x °K-1
Elastic stiffness, 1010 N/m2 C11E = 13.5; C33E = 5.68; C12E = 0.375
  C44E = 5.85; C13E = 3.35; C55E = 14.67;
Piezoelectric stress constants, C/m2 e15 = 0.45; e31 = 0.209; e33 = 0.928

We supply GaSe optical elements made according to customers' order.

I N Q U I R Y    F O R M :

Material:
Quantity of elements:
Application:
For example: SHG@1064; SFG@800+267->200; DFG@780-842->10600; OPO@355->460÷560+960÷1150; etc.
polished sites:

BLOCK    or  BLOCK
  a-b b-c a-c
or d  
Type & angles:
  I    II         angles:  theta ° , phi °
Dimensions/Tolerances:
 For example:
10.0 +/- 0.1
Coating:

For example: p-coating, ARC s1/s2 1064 R<0.25%; ARC s1/s2 1064 R<0.25%+532<0.5%;
BBAR s1/s2 1064 R<1%+3÷10<5% etc.
a = mm;
c = mm 		b     = mm or
dia. = mm;
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