LightPath 390036 | BBAR (1800-3000nm) IR Aspheric Lens

LightPath 390036 | 6.5mm Dia., 0.56 NA, BBAR (1800-3000nm), Mounted IR Aspheric Lens

Diameter (mm):

6.50 ±0.10

Effective Focal Length EFL (mm):

4.00

Numerical Aperture NA:

0.56

Focal Length Specification Wavelength (nm):

2500

Focal Length Specification Wavelength (μm):

2.50

Center Thickness CT (mm):

2.50

Coating:

BBAR (1800-3000nm)

Coating Specification:

R_avg <1.0% @ 1.8 - 3.0μm

Substrate:

Black Diamond™ BD-2 (Ge₂₈Sb₁₂Se₆₀)

Clear Aperture CA (mm):

5.00

Surface Quality:

80-50

Bevel:

Protective bevel as needed

f/#:

0.89

Coefficient of Thermal Expansion CTE (10^-6/°C):

14.00

Density (g/cm³):

4.68

Index of Refraction n_d @ 10μm:

2.6023

Index of Refraction n_d @ 14μm:

2.5843

Index of Refraction n_d @ 4μm:

2.6210

Index of Refraction n_d @ 5μm:

2.6173

Lightpath Lens Code:

390036

Mount:

Stainless Steel, M9 x 0.5 Thread

Thermo-optic coefficient dn/dT:

70 x 10^-6/°C from -40° to +80°C (5 - 14 μm)

Transformation Temperature (°C):

285.00

Type:

Aspheric Lens

Wavelength Range (nm):

1800 - 3000

Working Distance (mm):

3.05

Conjugate Distance:

Infinite

Regulatory Compliance

RoHS 2015:

Compliant

Reach 209:

Compliant

Product Family Description

Wavelength Range of 1.8 - 12μm
Variety of Coating Options
Mounted and Unmounted Versions

LightPath® Mid-Wave and Long-Wave Infrared (IR) Aspheric Lenses feature a low-cost, molded design and offer several key benefits over Germanium substrate aspheres. With a dn/dT and CTE significantly less than that of Germanium, the lenses feature a smaller change in focal length as a function of temperature change. Featuring a higher operating temperature than Germanium (which suffers 20 – 30% transmission loss at 100°C), the lenses can be used in applications including collimators for QCL lasers and as components within thermal imaging assemblies.