Broadband Mid-IR polarizers
Broadband Mid-IR polarizers
| +0/-0,5mm |
| <5arcmin |
| 80-50 SD (for holographic type) |
| <3 fringes/inch @633nm |
| >50W/cm2 CW or >0,7J/cm2 100ns pulsed |
| >120W/cm2 CW or >2J/cm2 100ns pulsed |
A fine array of parallel conducting wires whose period is smaller compared to the wavelength of incident radiation will transmit one polarisation and reflect the other. The component of the radiation whose electric vector is perpendicular to the direction of the wires and induces current in the wires will be transmitted and the parallel vector
reflected. Altechna's Mid-IR polarizers are produced by holographic method (i.e. laser interferometry) or mechanically ruled. These polarisers do not suffer from beam displacement, are not affected by diverging or converging beam,
have wide acceptance angle without degradation of performance and portable.
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Extremely broadband |
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Wide acceptance angle |
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Compact and portable |
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Polyethylene polarizers for 20-1000 microns are also available! |
Performance table
| Material | Spectral range (um) | Transmission efficiency, % (k1) ; (k2) | Degree of polarisation, % (k1-k2) / (k1+k2) | Extinction ratio (k1/2k2) | Contrast ratio (k1/k2) | Type | | KRS-5 | 2-35 microns | (k1>75%; k2<0,7%)@3um ; (k1>71%; k2<0,3%)@15um | 98,2%@3um ; 99,2%@15um | 54:1@3um ; 118:1@15um | 108:1@3um ; 236:1@15um | Holographic | | CaF2 | 1-10 microns | (k1>85%; k2<0,7%)@3um ; (k1>80%; k2<0,24%)@8um | 98,4%@3um ; 99,4%@8um | 61:1@3um ; 165:1@8um | 122:1@3um ; 330:1@8um | Holographic | | BaF2 | 1-13 microns | (k1>85%; k2<0,58%)@3um ; (k1>85%; k2<0,23%)@10um | 98,6%@3um ; 99,5%@10um | 73:1@3um ; 185:1@10um | 146:1@3um ; 370:1@10um | Holographic | | ZnSe | 1-16 microns | (k1>70%; k2<0,6%)@3um ; (k1>72%; k2<0,22%)@10um | 98,3%@3um ; 99,4%@10um | 58:1@3um ; 163:1@10um | 116:1@3um ; 326:1@10um | Holographic | | CaF2 | 1-9 microns | (k1>70%; k2<0,7%)@3um | >98%@3um | >50:1@3um | >100:1@3um | Mechanically ruled | | ZnSe | 1,5-14 microns | (k1>70%; k2<1,4%)@3um | >97%@3um | >25:1@3um | >50:1@3um | Mechanically ruled |
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