Raytools Lens Origi nal 27.9x4.1mm 4kw Laser Protective Windows 211LCG0037 JGS1 1064nm Quartz Fused Silica BT210 BT240. Application: Raytools Original. Laser Lens Power: 4kw. Wavelength: 1064nm(900-1100nm) For Fiber Laser Beam.
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