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尺寸介于直徑½英寸至12英寸不等
每個直徑75mm或更大的λ/20平晶都帶有校準證書
具有標準金屬反射鏡鍍膜：λ/10反射鏡及λ/20反射鏡
| 涂層: | Uncoated |
| 構造 : | Single Surface |
| 平行度（弧分）: | ≤3 |
| 表面質量: | 60-40 |
光學平晶主要作為參考（測光板），可用來對比未知光學表面的平滑度。每片光學平晶都經過我們專業驗光師的巧手打磨而成，并使用Zygo干涉儀進行測試以確保表面精度。單面光學平晶的第二層表面則經過高度的磨光，以達到可觀察干涉樣式的窗口片質量。每個光學平晶都放置于一個非常結實的盒子中用于保存。直徑75mm或更大的λ/20平晶都帶有校準證書。
產品信息
| 表面平整度 | Dia. (mm) | 厚度(mm) | 基底 | 產品編碼 |
| λ/20 | 12.70 | 3.30 | Fused Silica (Corning 7980) | #43-400-000 |
| λ/20 | 12.70 | 3.30 | ZERODUR® | #43-404-000 |
| λ/10 | 12.70 | 3.30 | Fused Silica (Corning 7980) | #43-319-000 |
| λ/10 | 12.70 | 3.30 | ZERODUR® | #43-327-000 |
| λ/20 | 25.40 | 12.70 | Fused Silica (Corning 7980) | #43-408-000 |
| λ/20 | 25.40 | 12.70 | ZERODUR® | #43-412-000 |
| λ/10 | 25.40 | 12.70 | Fused Silica (Corning 7980) | #01-913-000 |
| λ/10 | 25.40 | 12.70 | ZERODUR® | #32-195-000 |
| λ/20 | 50.80 | 12.70 | Fused Silica (Corning 7980) | #43-416-000 |
| λ/20 | 50.80 | 12.70 | ZERODUR® | #43-420-000 |
| λ/10 | 50.80 | 12.70 | Fused Silica (Corning 7980) | #01-914-000 |
| λ/10 | 50.80 | 12.70 | ZERODUR® | #32-199-000 |
| λ/20 | 76.20 | 19.05 | Fused Silica (Corning 7980) | #47-573-000 |
| λ/20 | 76.20 | 19.05 | ZERODUR® | #48-117-000 |
| λ/10 | 76.20 | 19.05 | Fused Silica (Corning 7980) | #01-915-000 |
| λ/10 | 76.20 | 19.05 | ZERODUR® | #31-391-000 |
| λ/20 | 101.60 | 19.05 | Fused Silica (Corning 7980) | #47-574-000 |
| λ/20 | 101.60 | 19.05 | ZERODUR® | #48-118-000 |
| λ/10 | 101.60 | 19.05 | Fused Silica (Corning 7980) | #01-611-000 |
| λ/10 | 101.60 | 19.05 | ZERODUR® | #31-392-000 |
| λ/20 | 152.40 | 25.40 | Fused Silica (Corning 7980) | #47-575-000 |
| λ/20 | 152.40 | 25.40 | ZERODUR® | #48-119-000 |
| λ/10 | 152.40 | 25.40 | Fused Silica (Corning 7980) | #01-612-000 |
| λ/10 | 152.40 | 25.40 | ZERODUR® | #31-393-000 |
| λ/20 | 203.20 | 38.10 | Fused Silica (Corning 7980) | #49-048-000 |
| λ/20 | 203.20 | 38.10 | ZERODUR® | #49-049-000 |
| λ/10 | 203.20 | 38.10 | Fused Silica (Corning 7980) | #31-390-000 |
| λ/10 | 203.20 | 38.10 | ZERODUR® | #31-394-000 |
| λ/10 | 254.00 | 38.10 | Fused Silica (Corning 7980) | #46-715-000 |
| λ/20 | 254.00 | 38.10 | Fused Silica (Corning 7980) | #65-879-000 |
| λ/10 | 304.80 | 38.10 | Fused Silica (Corning 7980) | #69-921-000 |
| λ/20 | 304.80 | 38.10 | Fused Silica (Corning 7980) | #65-880-000 |
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