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CLBO Crystal & its Applications

CLBO (CsLiB6O10) is another nonlinear optical crystal from the borate family developed by the Chen team. Compared to BBO and LBO, CLBO has a shorter UV cutoff wavelength, making it a good choice for 4th and 5th harmonic generation of Nd:YAG to genenate DUV high power laser. The effective nonlinear coefficient of CLBO is larger than that of LBO, while smaller than that of BBO. However, CLBO exhibits a greater spectral and temperature acceptance, larger angular tolerance, and a smaller walk-off angle than BBO. These advantages allow CLBO to achieve greater SHG conversion efficiency than BBO, particularly with ultra-fast lasers.

CLBO Crystal Properties

Crystal Structure:

Tetragonal, Space group I 42m

Lattice Parameter:

a = b = 10.494 Å, c = 8.939 Å, Z=4

Melting Point:

~844.5°C

Transparency Range:

180-2750nm

SHG @1064nm+266nm-->213nm:

Phase matching angle:

theta=68.4° (BBO 51.1°)

Deff:

0.87 pm/V (BBO 1.26pm/V)

Angular acceptance:

0.42 mrad-cm (BBO 0.11mrad-cm)

Walk-off angle:

1.69°(BBO 5.34°)

Temperature acceptance:

4.6°C-cm (BBO 3.1°C-cm

Spectral acceptance:

0.16nm-cm (BBO 0.08nm-cm)

Sellmeier coefficients(λ in µm):

no² = 2.2104 + 0.01018 / (λ² - 0.01424) - 0.01258 λ²
ne² = 2.0588 + 0.00838 / (λ² - 0.01363) - 0.00607 λ²

CLBO Crystal Specifications

Dimension Tolerance:

+0/-0.1mm(WxH) +0.1/-0.2mm thickness

Surface Quality:

10-5 Scratch-dig

Flatness:

<λ/8 @633nm

Chamfer:

0.1mm@45°

Clear Aperture:

Central 90% of Diameter

Parallelism:

<10 arc seconds

Perpendicular:

<10 arc minutes

Orientation Angle:

+/-0.25°

Damage Threshold:

0.3GW/cm²@1064nm 10ns

Coating:

Dual wavelength AR coating: R<0.2% & 1%

i. CLBO Crystal

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