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Broadband AR Coated Achromatic Lenses(Doublet Lenses)

Achromatic Lenses are used to minimize or eliminate chromatic aberration. The achromatic design also helps minimize spherical aberrations. Achromatic Lenses are ideal for a range of applications, including fluorescence microscopy, image relay, inspection, or spectroscopy. Achromatic Lenses, which are often designed by either cementing two elements together or mounting the two elements in a housing, create smaller spot sizes than comparable singlet lenses.
  • product origin:

    China
  • shipping port:

    Fuzhou China
  • lead time:

    4 working weeks
  • payment:

    T/T Payment, Western Union
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  • description

1. What do you mean by achromatic combination?


An achromatic lens can be defined as a lens which is made by acombination of two different types of lenses carrying different focal powers in a manner such that the images formed by the light of both the combined lenses are free from chromatic aberration or achromatism.


2. What are achromatic lenses used for?


Achromatic Lenses are used to minimize or eliminate chromatic aberration. The achromatic design also helps minimize spherical aberrations. Achromatic Lenses are ideal for a range of applications, including fluorescence microscopy, image relay, inspection, or spectroscopy.


3. What can we do for you ?


Achromatic Lenses

Cemented Achromatic Doublets
Cemented Achromatic Triplets
Achromatic Doublet Pairs
Negative Achromatic Lenses
Achromatic Cylindrical Lenses
Near UV Achromatic Lenses
Near-IR (NIR) Achromatic Lenses 
UV-to-NIR Corrected Triplets



Specification


Material:

 Crown Glass&Flint Glass CDGM, Schott, Ohara etc
Dimension Tolerance:
 ±0.1mm(Standard), ±0.01mm(High Precision)
Center Thickness Tolerance:
 ±0.1mm(Standard), ±0.05mm(High Precision)
Paraxial Focal Length:
 ±2%
Surface quality:
 60/40(Standard), 20/10(High Precision)
Clear Aperture:
 >85%
Surface Figure:
 λ/2(Standard), λ/4(High Precision) @633nm
Centration:
 3 arc minutes
Bevel:
 <0.25mm×45°
Coating:
Upon requirement


Part No. F(mm) Φ
(mm)
Nd A Nd B R1
(mm)
R2=R3
(mm)
R4
(mm)
Tc1
(mm)
Tc2
(mm)
Fb
(mm)
ULAC020006 20 6 BK7 SF5 12.36 -8.51 -24.38 2.6 1.0 18.29
ULAC025006 25 6 BK7 SF5 15.7 -10.66 -29.99 2.3 1.0 23.45
ULAC030006 30 6 BK7 SF5 18.88 -12.94 -34.68 1.9 1.0 28.69
ULAC025008 25 8 BK7 SF5 15.6 -10.81 -30.48 2.9 1.0 23.12
ULAC030008 30 8 BK7 SF5 18.88 -12.88 -36.22 2.7 1.0 28.27
ULAC025127 25 12.7 BK7 SF5 15.6 -11.40 -31.05 4.3 1.3 22.25
ULAC030127 30 12.7 BK7 SF5 18.53 -13.49 -37.84 4.0 1.3 27.36
ULAC040127 40 12.7 BK7 SF5 25.23 -17.54 -48.75 3.4 1.3 37.77
ULAC050127 50 12.7 BK7 SF5 31.26 -21.93 -62.37 3.1 1.3 47.99
ULAC075127 75 12.7 BK7 SF5 46.77 -32.96 -94.62 2.6 1.3 73.23
ULAC040018 40 18 BK7 SF5 24.27 -18.35 -53.09 5.4 1.5 36.51
ULAC050018 50 18 BK7 SF5 31.69 -22.00 -60.57 4.8 1.5 46.98
ULAC060018 60 18 BK7 SF5 37.84 -26.49 -73.79 4.1 1.5 57.3
ULAC080018 80 18 BK7 SF5 49.55 -36.81 -165.58 3.4 1.5 77.41
ULAC060254 60 25.4 BK7 SK5 37.33 -27.16 -75.86 7.0 2.0 55.56
ULAC120254 120 25.4 BK7 SF5 73.28 -54.33 -159.96 4.2 2.0 117.1
ULAC025127N -25 12.7 BK7 F2 -15.6 13.09 44.16 3.0 2.7 27.5
ULAC050254N -50 25.4 BK7 F2 -31.19 24.89 85.31 3.0 4.2 53.3


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1.  Germanium (Ge)


Germanium (Ge) is the preferred lens and window material for high performance infrared imaging systems in the 8–12 μm wavelength band. Its high refractive index makes Ge ideal for low power imaging systems because of minimum surface curvature. Chromatic aberration is small, often eliminating the need for correction.

 

Crystallographic properties
Syngony Cubic
Crystal Form Poly or Single Crystal
Lattice Constant 5.66
Cleavability <111>, non-perfect
Molecular Weight 72.6
Physical properties
Density, at 20 °C 5.33
Hardness, Mohs 6.3
Dielectric Constant for 9.37 × 109 Hz at 300 K 16.6
Melting 937
Thermal Conductivity, W/m·K at at 293 K 59
Thermal Expansion, 1/K at 298 K 6.1 × 10-6
Specific Heat Capacity, J/(kgK) at 273-373 K 0.074
Bandgap, eV 0.67
Knoop Hardness, kg/mm2 800
Youngs Modulus, Gpa 102.66
Shear Modulus, GPa 67.04
Bulk Modulus, GPa 77.86
Debye Temperature, K 370
Poissons Ratio 0.278
Elastic Coefficient C11=129, C12=48.3, C44=67.1
Apparent Elastic Limit 89.6 MPa (13000psi)
Chemical properties
Solubility in water None
Solubility in acids Soluble
Molecular Weight 72.59

2. Silicon (Si) 


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Crystallographic properties
Syngony Cubic
Lattice Constant, A 5.43
Physical properties
Density 2.33g/cm3
Hardness, Mohs 7
Dielectric Constant for 9.37 x 109 Hz 13
Melting point, оС 1414
Thermal Conductivity, W/m·K at 313 K 163
Thermal Expansion, 1/K at 293 K 2.6x10-6
Specific Heat Capacity, J/(kg°C) 712.8
Bandgap, eV 1.1
Knoop Hardness, kg/mm2 1100
Youngs Modulus, Gpa 130.91
Shear Modulus, GPan 79.92
Bulk Modulus, GPa 101.97
Debye Temperature, K 640
Poissons Ratio 0.28
Chemical properties
Solubility in water None
Molecular Weight 28.09

3、ZnS material:


ZnS MultiSpectral Under intense heat and pressure, defects within the crystalline lattice are virtually eliminated, leaving a water-clear material with minimal scatter and high transmission characteristics from 0.4 to 12 microns. This material is particularly well suited for high-performance common aperture systems that must perform across a broad wavelength spectrum.

Specifications:

Material: ZnS MultiSpectral
Diameter Tolerance: --------------------- +0.0, -0.1mm
Thickness Tolerance: -------------------- ±0.1mm
Clear Aperture: ---------------------------->85%
Parallelism: -----------------------------------3 arc minute
Surface Quality: ----------------------------80-50 scratch and dig
Wavefront Distortion: -------------------- λ /2 per 25mm @633mm
Bevel: -----------------------------------------Protective  (<0.2mm x 45° )
Coating: -------------------------------------- Optional (Uncoated, AR Coating, etc.)


4. ZnSe material


ZnSe is a preferred material for lenses, windows, output couplers and beam expanders for its low absorptivity at infrared wavelengths and its visible transmission. For high-power applications, it’s critical that the material bulk absorption and internal defect structure be carefully controlled, that minimum-damage polishing technology be employed, and the highest quality optical thin-film coatings are used. The material absorption is verified by CO2 laser vacuum calorimetry. Our quality assurance department provides testing and specific optics certification on request.

ZnSe is non-hygroscopic and chemically stable, unless treated with strong acids. It’s safe to use in most industrial field, and laboratory environments.



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