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MgF2 Coated Double-Convex (DCX) Lenses

Double Convex Lenses are used in image relay applications, or for imaging objects at close conjugates. Double Convex Lenses have positive focal lengths, along with two convex surfaces with equal radii. Aberrations will increase as the conjugate ratios increase. DCV Lenses are used in a range of industries or applications. Uni-Optics offers Double Convex lenses with a variety of coating options.
  • product origin:

  • shipping port:

    Fuzhou China
  • lead time:

    4 working weeks
  • payment:

    T/T Payment, Western Union
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  • description

1: What is the difference between convex lens and double convex lens?

One or both of the lens faces is part of a sphere and can be concave or convex. A lens is called a convex lens if it is thicker at the center than at the edges. ... Double convex lenses have focal points on both sides of the lens; these and the points at twice the focal length are used to locate objects and images.

2: What does a double convex lens do?

The fact that a double convex lens is thicker across its middle is an indicator that it will converge rays of light that travel parallel to its principal axis. A double convex lens is a converging lens. A double concave lens is also symmetrical across both its horizontal and vertical axis.

3: What is the focal length of a double convex lens?

If the radius of a curvature of a double convex lens is 10 cm and 15 cm and its refractive index is 1.5, then what is its focal length? A double convex lens 1.5 and the radius of curvature are 20 cm and 40 cm.

  double convex lenses

Common Specification:

Material: Optical glass/Fused Silica
Design wavelength: 546.1nm
Diameter tolerance: +0/-0.05mm
Focal tolerance: +/-2%
surface quality : 40-20 S/D 
Centration: 1 arcmin 
Surface flatness: N=3 △N=0.5 
Clear aperture: 90%
Bevel: Protective
Coating Optional: Single layer MgF2, Multiple layers BBAR coating
Designed for 0° Angle of Incidence

Part No. Material F(mm) Φ(mm) R1=R2(mm) Tc(mm) Te(mm) Fb(mm)
ULDX010010 BK7 10.0 10.0 9.450 4.9 2.0 8.20
ULDX015127 BK7 15.0 12.7 14.660 4.9 2.0 13.30
ULDX020127 BK7 20 12.7 20.010 4 2.0 18.60
ULDX025127 BK7 25 12.7 25.280 3.6 2.0 23.80
ULDX030127 BK7 30 12.7 30.520 3.3 2.0 28.90
ULDX040127 BK7 40 12.7 40.950 3 2.0 39.00
ULDX254254 BK7 25.4 25.4 24.710 9 2.0 22.20
ULDX035254 BK7 35 25.4 35.090 6.8 2.0 32.80
ULDX040254 BK7 40 25.4 40.400 6.1 2.0 37.90
ULDX050254 BK7 50 25.4 50.920 5.2 2.0 48.30
ULDX060254 BK7 60 25.4 61.400 4.7 2.0 58.50
ULDX075254 BK7 75 25.4 77.040 4.1 2.0 73.60
ULDX100254 BK7 100 25.4 103.050 3.6 2.0 98.80
ULDX125254 BK7 125 25.4 129.020 3.3 2.0 123.90
ULDX150254 BK7 150 25.4 154.970 3 2.0 149.00
ULDX200254 BK7 200 25.4 206.840 2.8 2.0 199.00
ULDX050030 BK7 50.0 30.0 50.731 6.5 2.0 47.80
ULDX500030 BK7 500.0 30.0 518.306 2.4 2.0 499.20
ULDX045038 BK7 45.0 38.0 44.836 10.4 2.0 41.40
ULDX100038 BK7 100.0 38.0 102.520 6.5 3.0 97.80
ULDX150038 BK7 150.0 38.0 154.570 5.4 3.0 148.20
ULDX200038 BK7 200.0 38.0 206.510 4.8 3.0 198.40
ULDX100050 BK7 100.0 50.0 102.060 9.2 3.0 96.90
ULDX200050 BK7 200.0 50.0 206.280 6.0 3.0 198.00
ULDX250050 BK7 250.0 50.0 258.220 5.4 3.0 248.20
ULDX400050 BK7 400.0 50.0 413.870 4.5 3.0 398.50
ULDX500050 BK7 500.0 50.0 517.580 4.2 3.0 498.60
JLDX015127 JGS1 15.0 12.7 12.900 5.3 2.0 13.10
JLDX020127 JGS1 20.0 12.7 17.690 4.4 2.0 18.40
JLDX025127 JGS1 25.0 12.7 22.380 3.8 2.0 23.70
JLDX030127 JGS1 30.0 12.7 27.040 3.5 2.0 28.80
JLDX040127 JGS1 40.0 12.7 36.310 3.1 2.0 38.90
JLDX025254 JGS1 25.0 25.4 21.220 10.4 2.0 21.10
JLDX035254 JGS1 35.0 25.4 30.990 7.4 2.0 32.40
JLDX050254 JGS1 50.0 25.4 45.100 5.7 2.0 48.00
JLDX075254 JGS1 75.0 25.4 68.320 4.4 2.0 73.50
JLDX100254 JGS1 100.0 25.4 91.420 3.8 2.0 98.70
JLDX050038 JGS1 50.0 38.0 44.100 11.6 3.0 45.90
JLDX100038 JGS1 100.0 38.0 90.900 7.0 3.0 97.60
JLDX150038 JGS1 150.0 38.0 137.130 5.7 3.0 148.00
JLDX200038 JGS1 200.0 38.0 183.130 5.0 3.0 198.30
JLDX500038 JGS1 500.0 38.0 459.480 3.8 3.0 498.70

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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) 

Silicon (Si) is grown by Czochralski pulling techniques (CZ) and contains some oxygen that causes an absorption band at 9 microns.To avoid this, material can be prepared by a Float-Zone (FZ) process. Optical silicon is generally lightly doped (5 to 40 ohm cm) for best transmission above 10 microns, and doping is usually boron (P-type) and phosphorus (N-type). After doping silicon has a further pass band: 30 to 100 microns which is effective only in very high resistivity uncompensated material.
CZ Silicon is commonly used as substrate material for infrared reflectors and windows in the 1.5-8 micron region. The strong absorption band at 9 microns makes it unsuitable for CO2 laser transmission applications, but it is frequently used for laser mirrors because of its high thermal conductivity and low density. Application as window, lens in the 1.5 - 8 um region; Mirror for CO2 laser and spectrometer applications.

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.


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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