f-theta Scanning Lens for Photovoltaic Applications S4LFT1330-075
The energy transition presents global challenges, making renewable energy sources such as photovoltaics essential. A key to improving photovoltaic efficiency is to improve solar-cell manufacturing. Laser material processing is used to weld individual cells into modules, dope selective emitters, and remove extremely thin anti-reflective and passivation layers. In addition to fast, cost-effective production, it offers high precision and line widths of only a few micrometers. The F-Theta lens S4LFT1330-075 was developed specifically for these applications. Ultraviolet lasers are used particularly for ablating anti-reflective and passivation layers. These layers improve optical and electrical properties and thus solar-cell efficiency. Focus sizes are especially small in the ultraviolet range, producing correspondingly narrow lines. We have become a leading supplier of F-Theta lenses for photovoltaics. S4LFT1330-075 is suitable for M12/G12 wafers and can also process wafers as small as M2. S4LFT1330-075 operates at 343 nm-355nm. With a free aperture of 14mm, it achieves spot sizes <18μm over a 210 mmx210 mm field of view. The product family includes other lenses with similar specifications for green (515nm-532nm) and infrared (1030nm-1090nm) wavelengths. Model | Wavelength | Focal Length | Aperture | Transmittance | Working Distance | Beam Diameter | Weight S4LFT1330-075 | 346nm | 329.3mm | 36.0mm | >91% | 260.5mm | 40mm | 1.5kg
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Overview
Specifications
| Parameter | Value |
|---|---|
| design wavelength [vignetting <1%] | 355 nm |
| effective focal length [vignetting <1%；tolerance ±1.5%] | 329.3 mm |
| working distance [vignetting <1%；tolerance ±1.5%] | 260.5 mm |
| max. entrance beam-Ø [vignetting <1%] | 14.0 mm |
| aperture stop distance [vignetting <1%] | 36.0 mm |
| scan area for a 2 mirror system [vignetting <1%；mirror distance from lens housing：mirror 2 / mirror 1=26.0 / 46.0] | 210 mm×mm × 210 mm×mm |
| max. telecentricity error [vignetting <1%] | 21.0 ° |
| total transmission [vignetting <1%] | >97 % |
| lens material [vignetting <1%] | fused silica |
| LIDT (coating) [vignetting <1%；per 1ns pulse at 50Hz] | 1.0 J/cm² |
| SP and USP usable [vignetting <1%] | yes |
| cover glass [vignetting <1%] | S4LPG4160-075 |
| weight [vignetting <1%] | 1.5 kg |
Datasheet
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