- 描述
描述
平凹透镜为一面平一面凹的透镜，具有负焦距，常用来发散准直的入射光束。
平凹透镜具有负焦距，常用来发散准直的入射光束。在这种情况下，准直光束应该入射到曲面上，以最大程度地减小球面像差。平凹透镜能成虚像，因此常用作伽利略扩束系统中的入射光学元件；这种透镜具有理想的发散性，然后使用胶合透镜重新准直光束。在光学系统中，研究人员常小心的选择光学元件，使正透镜和负透镜引入的像差刚好抵消。还有人会用成对的透镜来增加会聚透镜的有效焦距。
平凹透镜规格:
| Material: | BK7, Fused Silica, SF10, CaF2, Sapphire .etc. |
| Paraxial Focal Length Tolerance: | ±2% |
| Dimension Tolerance: | ±0.2(General). ±0.05(High Precision) |
| Centration: | <3 arc min |
| IRR: | λ/4@633nm（General),λ/10@633nm(High Precision) |
| Clear Aperture: | >80%(Small Size), >95%(Large Size) |
| Surface Figure | <1.5λ@633nm（General),<λ/4@633nm(High Precision) |
| Surface Quality: | 60/40（General),10/5(High Precision) |
| Bevel: | <0.25mm |
| Coating: | Uncoated, AR,PR, HR, etc. |
常规尺寸
| Item No. | Φ(mm) | f(mm) | R(mm) | Tc(mm) | Te(mm) | Fb(mm) |
| Material | N-BK7 | |||||
| LPV-001 | 6 | -12 | 6.22 | 2 | 2.77 | -13.31 |
| LPV-002 | 6 | -24 | 12.44 | 2 | 2.37 | -25.31 |
| LPV-101 | 12.7 | -15 | 7.79 | 2 | 5.27 | -16.35 |
| LPV-102 | 12.7 | -20 | 10.37 | 2 | 4.17 | -21.32 |
| LPV-103 | 12.7 | -25 | 12.97 | 2 | 3.7 | -26.33 |
| LPV-104 | 12.7 | -30 | 15.56 | 2 | 3.4 | -31.31 |
| LPV-105 | 12.7 | -40 | 20.75 | 2 | 3 | -41.32 |
| LPV-106 | 12.7 | -50 | 25.94 | 2 | 2.79 | -51.33 |
| LPV-107 | 12.7 | -75 | 38.9 | 2 | 2.52 | -76.31 |
| LPV-108 | 12.7 | -100 | 51.88 | 2 | 2.39 | -101.33 |
| LPV-201 | 25.4 | -35 | 18.15 | 2 | 7.18 | -36.32 |
| LPV-202 | 25.4 | -50 | 25.94 | 2 | 5.32 | -51.33 |
| LPV-203 | 25.4 | -70 | 36.31 | 2 | 4.29 | -71.32 |
| LPV-204 | 25.4 | -75 | 38.9 | 2 | 4.13 | -76.31 |
| LPV-205 | 25.4 | -100 | 51.88 | 2 | 3.58 | -101.33 |
| LPV-206 | 25.4 | -125 | 64.96 | 2 | 3.26 | -126.36 |
| LPV-207 | 25.4 | -150 | 77.8 | 2 | 3.04 | -151.3 |
| LPV-208 | 25.4 | -175 | 90.78 | 2 | 2.89 | -176.32 |
| LPV-209 | 25.4 | -200 | 103.75 | 2 | 2.78 | -201.33 |
| LPV-210 | 25.4 | -250 | 129.72 | 2 | 2.62 | -251.39 |
| LPV-211 | 25.4 | -300 | 155.6 | 2 | 2.52 | -301.29 |
| LPV-212 | 25.4 | -500 | 259.4 | 2 | 2.31 | -501.39 |
| LPV-213 | 25.4 | -1000 | 518.7 | 2 | 2.16 | -1001.28 |
| LPV-301 | 30 | -80 | 41.5 | 2 | 4.81 | -81.32 |
| LPV-302 | 30 | -100 | 51.88 | 2 | 4.22 | -101.33 |
| LPV-303 | 30 | -200 | 103.75 | 2 | 3.09 | -201.33 |
| LPV-304 | 38 | -50 | 25.94 | 2 | 10.28 | -51.33 |
| LPV-305 | 38 | -100 | 51.88 | 2 | 5.6 | -101.33 |
| LPV-306 | 38 | -150 | 77.8 | 2 | 4.36 | -151.3 |
| LPV-307 | 38 | -200 | 103.75 | 2 | 3.76 | -201.33 |
| LPV-308 | 38 | -350 | 181.55 | 2 | 3 | -351.31 |
| LPV-309 | 38 | -500 | 259.4 | 2 | 2.7 | -501.39 |
| LPV-310 | 38 | -700 | 363.1 | 2 | 2.5 | -701.31 |
| LPV-401 | 40 | -50 | 25.94 | 2 | 11.42 | -51.33 |
| LPV-501 | 50 | -75 | 38.9 | 2 | 12.1 | -76.97 |
| LPV-502 | 50 | -100 | 51.88 | 3 | 9.42 | -101.99 |
| LPV-503 | 50 | -150 | 77.8 | 3 | 7.13 | -151.96 |
| LPV-504 | 50 | -200 | 103.75 | 3 | 6.06 | -201.99 |
| LPV-505 | 50 | -250 | 129.72 | 3 | 5.43 | -252.05 |
| LPV-506 | 50 | -400 | 207 | 3 | 4.52 | -401.03 |
| LPV-507 | 50 | -500 | 259.4 | 3 | 4.21 | -502.05 |
| LPV-508 | 50 | -600 | 311.2 | 3 | 4.01 | -601.91 |
| LPV-509 | 50 | -800 | 415 | 3 | 3.75 | -802.02 |
