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| Coad | 670365 | Substrate | Liquid Crystal Polymer / N-BK7 | |
| Type | Laser Mode Converter | Operating Temperature | -20 - 80℃ | |
| Dimension(mm) | 25.4 x 3.2 | Transmittance | >98%@633nm | |
| Wavelength(nm) | 633 | Gap Between Adjacent Areas | <10μm | |
| Clear Aperture（mm） | 21.50 | AOI | ±15° | |
| Mode Conversion | TEM00→TEM01/TEM10 | Transmission Light Deviation | ＜10 arcmin / ＜1 arcmin（without mechanical housing） | |
| Optical Retardance | λ/2 | RMS | ±5nm | |
| Delay Accuracy | ±λ/100 | Surface Quality | 40-20 | |
| Coating Type | AR Coating | Coating Specifications | Ravg<0.5%@400-700nm |
LBTEK Laser Mode Converter (LMC) is fabricated from N-BK7 window substrates and liquid crystal polymer (LCP) material. Using optical alignment technology, patterned LCP thin films with different fast-axis distributions are formed on the glass surface. By precisely controlling the film thickness, the phase retardation between the ordinary (o) and extraordinary (e) rays in the liquid crystal molecules is set to π, making it a single-wavelength device.
The LBTEK Laser Mode Converter is a diffractive optical element that, through its specific structure and phase distribution, enables the conversion of a fundamental TEM₀₀ mode into higher-order Hermite–Gaussian modes. Different structural and phase distribution designs allow different mode conversions. LBTEK offers standard converters for TEM₀₀ → TEM₁₀ / TEM₀₁ and TEM₀₀ → TEM₁₁ transformations, with available operating wavelengths of 532 nm, 633 nm, 780 nm, and 1064 nm. All converters are mounted in a black anodized standard SM1 lens tube engraved with the fast-axis orientation, product model, and specifications for easy identification and use.
LBTEK Mode Converter is fabricated on an N-BK7 window with a double-substrate structure and a total thickness of 3.2 mm. It provides a uniform phase retardation of λ/2 across the entire clear aperture at the design wavelength. The TEM₀₀–TEM₀₁ mode converter divides the entire glass into two regions, where the fast-axis orientations are orthogonal and the phase difference is π. The converter is mounted in a black anodized standard SM1 lens tube, which is engraved with the product model and specifications. On the end face, a vertical line and a dot are marked: the vertical line indicates the 0° fast-axis direction, and the region corresponding to the dot has its fast axis parallel to the vertical line, while the adjacent region has its fast axis perpendicular to it (as illustrated, the fast axis in the upper region is 0°, and in the lower region it is 90°).
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