波長板為將1軸性結晶水晶切入平行結晶軸的平面，給予入射光相位差(延遲)的隻折射元件。
2塊水晶板結晶軸直交接著構造，可減輕因溫度變化導致相位差的影響。
1/4波長板、1/2波長板皆在兩面加工有窄帶域反射防止膜。
結晶的複折射亮因波長不同，其位相差亦會變動。因此在使用波長板得到/4、或/2位相差需要根據使用波長選擇，其他波長域無法獲得鎖定相位差。
| 款型 | 適應雷射 | 適應雷射 | 波長(nm) |
| S33A-355-2 | YAG | 354.6 | |
| S33A-405-2 | λ/2 | LD | 405 |
| S33A-633-2 | λ/2 | He-Ne | 632.8 |
| S33A-650-2 | λ/2 | LD | 650 |
| S33A-780-2 | λ/2 | LD | 780 |
| S33A-830-2 | λ/2 | LD | 830 |
| S33A-1064-2 | λ/2 | LD | 830 |
| S33-405-2 | LD | λ/2 | 405 |
| S33-780-2 | λ/2 | LD | 780 |
| S33-830-2 | λ/2 | LD | 780 |
| S33-1064-2 | λ/2 | LD | 780 |
| S33A-405-4 | λ/4 | LD | 405 |
| S33A-633-4 | λ/4 | He-Ne | 632.8 |
| S33A-650-4 | λ/4 | LD | 650 |
| S33A-780-4 | λ/4 | LD | 780 |
| S33A-830-4 | λ/4 | LD | 830 |
| S33A-980-4 | λ/4 | LD | 980 |
| S33A-1064-4 | λ/4 | YAG | 1064 |
| S33-405-4 | λ/4 | LD | 405 |
| S33-633-4 | λ/4 | He-Ne | 632.8 |
| S33-780-4 | λ/4 | LD | 780 |
| S33-830-4 | λ/4 | LD | 830 |
| S33-1064-4 | λ/4 | YAG | 1064 |
| 款型 | 適應雷射 | 適應雷射 | 波長(nm) | CAD |
| S33A-355-2 | YAG | 354.6 | - | |
| S33A-405-2 | λ/2 | LD | 405 | - |
| S33A-633-2 | λ/2 | He-Ne | 632.8 | - |
| S33A-650-2 | λ/2 | LD | 650 | - |
| S33A-780-2 | λ/2 | LD | 780 | - |
| S33A-830-2 | λ/2 | LD | 830 | - |
| S33A-1064-2 | λ/2 | LD | 830 | - |
| S33-405-2 | LD | λ/2 | 405 | - |
| S33-780-2 | λ/2 | LD | 780 | - |
| S33-830-2 | λ/2 | LD | 780 | - |
| S33-1064-2 | λ/2 | LD | 780 | - |
| S33A-405-4 | λ/4 | LD | 405 | - |
| S33A-633-4 | λ/4 | He-Ne | 632.8 | - |
| S33A-650-4 | λ/4 | LD | 650 | - |
| S33A-780-4 | λ/4 | LD | 780 | - |
| S33A-830-4 | λ/4 | LD | 830 | - |
| S33A-980-4 | λ/4 | LD | 980 | - |
| S33A-1064-4 | λ/4 | YAG | 1064 | - |
| S33-405-4 | λ/4 | LD | 405 | - |
| S33-633-4 | λ/4 | He-Ne | 632.8 | - |
| S33-780-4 | λ/4 | LD | 780 | - |
| S33-830-4 | λ/4 | LD | 830 | - |
| S33-1064-4 | λ/4 | YAG | 1064 | - |
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