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The MTF measurement can be processed from the wavefront map using a double fourier transform. Shack-Hartmann sensors provide the wavefront map in just in a single shot acquisition and therefore provide almost instantaneously a 2D-MTF measurement, offering access to every azimuthal angle.

In this article we present a MTF measurement performed with a HASO SWIR Shack-Hartmann wavefront sensor manufactured by Imagine Optic SA, a company renowned for its expertise in optical metrology instrumentation for over 25 years. It is combined with the RFLEX accessory which combines a light source and allows an easy double pass set-up.

The Modulation Transfer Function or MTF measurement is a crucial metrology technique to evaluate how an object’s contrast is captured after passing through an optical system as a function of spatial frequency. It is a critical criteria especially for imaging systems, as it quantifies the imaging quality. The MTF curve is usually compared to the ideal MTF given by a diffraction limited optical system (see Figure 1).

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For a deeper analysis, WaveView4 can also compute the Point Spread Function (PSF), wavefront aberrations and Zernike or Legendre polynomials.

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On the screenshot below, we can clearly see that this optical system on Figure 2 has aberrations. Indeed, the wavefront is not uniform and the MTF curve (solid line) is not close to the diffraction limit (dotted line).

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As the MTF is a quantitative and standardized way to characterize optical systems, MTF measurements are commonly used by optical engineers and designers in order to:

Note that the HASO R-FLEX instrument can also be used to  characterize large optics if combined with the LA ( Large Aperture ) accessory module.

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Jenoptik AG (Jenoptik) develops integrated photonics products. The company’s product portfolio comprises semiconductor materials, diode lasers, laser machines, industrial metrology instruments, power supply and drive systems. It also provides camera modules, aviation systems, optics and optical systems, opto-electronics system, and traffic safety systems. The company serves to various industries, including automotive, aviation, defence and security, electronics and information technology, public safety, healthcare and life sciences, industry and mechanical engineering, and semiconductor industries. It has business presence across Europe, the Americas, the Middle East and Africa and Asia-Pacific. Jenoptik is headquartered in Jena, Thuringia, Germany.

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HASO sensor offer a measurement accuracy of  λ/100 rms which translates to a MTF calculation with an accuracy of less than 1 point (1%). Moreover, this measurement solution allows convenient implementation allowing on-axis and off-axis measurements.