鍺（Ge）是一種相對較硬的紅外透射材料，可阻擋紫外線和可見光，并可透射2μm以上的紅外，平均透射率為45%。Ge通常具有7-14μm的DLC/AR涂層，平均透射率為83%，或者3-12μm的AR/AR涂層的平均反射率小于5%。Ge由于其高折射率和低光學色散而被期望用于透鏡設計。

Part No. Grade D (mm) W (mm) L (mm) T (mm) Drilled
WCF2004 UV Grade 20 2
WCF2502 UV Grade 25 1
WCF2505 UV Grade 25 2
WCF2506 UV Grade 25.4 1
WCF2508 UV Grade 25.4 2
WCF5001 UV Grade 50 3
WCF3826 UV Grade 26 38 1
WCF7527 UV Grade 26 76 1
WCF1000 Standard Grade 10 2
WCF1200 Standard Grade 12 2
WCF1301 Standard Grade 13 1
WCF1303 Standard Grade 13 2
WCF1500 Standard Grade 15 2
WCF2001 Standard Grade 20 1
WCF2002 Standard Grade 20 2
WCF2500 Standard Grade 25 1
WCF2503 Standard Grade 25 2
WCF2507 Standard Grade 25.4 2
WCF3200 Standard Grade 32 3
WCF4000 Standard Grade 40 5
WCF5000 Standard Grade 50 3
WCF1010 Standard Grade 10 10 2
WCF1300 Raman Grade 13 0.2
WCF1302 Raman Grade 13 1
WCF1304 Raman Grade 13 2
WCF2000 Raman Grade 20 0.5
WCF2003 Raman Grade 20 2
WCF2501 Raman Grade 25 1
WCF2504 Raman Grade 25 2
WCF3822 Raman Grade 22 38 2
WCF7523 Raman Grade 25 75 1
WCF7626 Raman Grade 26 76 1
WCF3819 Spectroscopic Standard Grade 19 38.5 4
WCF3820 Spectroscopic Standard Grade 19 38.5 4 Drilled
WCF4123 Spectroscopic Standard Grade 23 41 6
WCF4124 Spectroscopic Standard Grade 23 41 6 Drilled