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秒速飞艇网站,app,秒速飞艇开奖结果预测,免费计划,Spectrogon | Optical filters, thin film coatings and holographic diffraction gratings
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High transmission, high rejection outside the passband, fine surface quality and the coating uniformity gives our filters excellent performance. Range 400 to 14 000 nm. Our custom made gratings have high efficiency, wide tuning range, high damage threshold
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