Hyperspectral Imaging Lens 1.0μm-2.5μm SWIR Case Study

Shanghai Optics recently collaborated with an industry leading spectrometer manufacturer to design and optimize a Hyperspectral imaging SWIR lens for spectroscopic diagnostics equipment. The application, which has an operating spectrum from 1um-2.5um, gathers reflected light in a room temperature environment and is processed for short wave imaging applications.

Spectroscopes are scientific instruments typically used in applications where a spectrum of light needs to be separated into individual spectral lines. The common components of a spectroscope include a light source, monochromator, detector and any relating HW/SW used for processing.

Material Selection and Coating Technology:
Due to the broadband requirements of the application in the shortwave infrared spectrum, our optical design team carefully chose the appropriate glass materials and coating formula to ensure that the required wavelengths would be transmissible throughout the 1um-2.5um region. Also, too mitigate any chromatic aberration or secondary spectrum within the optical design, special materials were chosen to meet the strict demands of the SWIR lens application.

SWIR Imaging Lenses

Structural Analysis

SWIR Lens zemax
SWIR Lens outline

SWIR Wavelength Data
Comparing to ordinary SWIR Lens that has a working wavelength range between 0.9μm to 1.7μm, we use better performance material for our lens, such as ZnSe, Zns and etc. The working wavelength of this lens is between 1.0μm-2.5μm which it can be widely used for many applications.

MTF Curve for 80lp mm
MTF Curve for 80lp/mm

MTF Curve for 100lp mm
MTF Curve for 100lp/mm

MTF Curve for 120lp mm
MTF Curve for 120lp/mm

As shown in the above MTF curves, MTF is greater than 0.2 for field of view at 120lp/mm; MTF is greater than 0.25 at 100lp/mm and MTF is greater than 0.3 at 80lp/mm. Compare to other SWIR Lens, the spatial resolution of our lens is very good and can obtain ideal imaging quality when using in the spectrometer.

Core Advantages:

  • High precision mechanical design for extremely fine focusing
  • Fully refractive optical design
  • F/2.4 large clear aperture
  • Corrective aberration lens within full spectral region
  • Ultra broadband AR coating
  • Outstanding spectrum/spatial resolution
  • Low scattering /low stray light with noise reduction

Typical Applications:

  • Remote Sensing for Measurement and Analysis
  • Quality Control for:
    • Food Safety
    • Pharmaceutical
    • LCD Displays
    • Photovoltaics and Solar Panels
  • Waste Recycling and Sorting