Germanium

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Germanium is a most commonly used infrared material for windows and lenses in night vision and thermal-imaging systems. Germanium has excellent transmission in the 2 µm - 12 µm range and can be used in both mid-wave infrared and long-wave infrared systems. Germanium is inert, mechanically rugged, and fairly hard. It fits applications in various environments.

· Windows (coated and uncoated)

· Lenses (coated and uncoated)

· Prisms (coated and uncoated)

· Polished and unpolished blanks:

       Plano round blanks
       Curve generated blanks
       Rectangular and old shapes

Specification:
Tolerance
             Diameter:               +/- 0.025mm
             Length & Width:    +/- 0.05 ~ +/-0.1mm
             Thickness:              +/- 0.05mm
             Flatness                N<2
             Parallelism              <2'
             Bevel                    0.2 ~ 1mm
             Edge.Chips            =0.5mm
             ETV                       =0.02mm
             Surface                 40/20 or 60/40

We can also make with custom specifications if required.

Germanium Optics and Blanks:

Germanium Crystal (mono-crystals and poly-crystals)

Ge Crystals

Crystal Specifications

    Purity                           >99.9999%
    Crystal Structure          Monocrystalline &
                                              Polycrystalline
    Conductive Type                N-type
    Orientation                       <111>
    Typical Resistivity             5-40 Ohm-cm

(EMI grade of Ge, with a lower resistivity can be also provided according to your request.)

Anti-reflection Coating and Diamond Like Carbon (DLC) Coating

We offer Anti-reflection coating and Diamond Like Carbon (DLC) coating for Germanium components.

Due to its high index of refraction, an anti-reflection coating is usually required on germanium lenses and windows for sufficient transmission in the region of interest. Diamond Like Carbon is the most rugged and abrasion resistant anti-reflection coating designed for severe environmental conditions to withstand the action of windshield wipers, salt spray, high humidity and corrosive environments.

Anti-reflection coating options:

8 - 12µm for thermal imaging applications.                                            TAVG >98%
3 - 5µm for mid-infrared application.                                                  TAVG>90%
3 - 12µm for mid-infrared or broadband multi-spectral applications.      TAVG >92%

Diamond Like Carbon (DLC) Coating

8 - 12µm for thermal imaging applications. TAVG >90%
3 - 5µm for mid-infrared application.