1.55 µm Verifire MST Interferometer: Key Features Explained

Quick Answer

The Zygo 1.55 µm Verifire MST Interferometer delivers precise surface metrology with a 4-inch or 6-inch aperture, 1X fixed magnification, and encoded focus, making it a reliable choice for production and lab environments.

Frequently Asked Questions

What does the 1.55 µm wavelength mean for my measurements?

The 1.55 µm wavelength is in the infrared range, which reduces sensitivity to ambient light and can measure surfaces that are transparent or highly reflective at visible wavelengths. It is particularly useful for measuring silicon wafers and coated optics.

How does encoded focus improve measurement repeatability?

Encoded focus automatically records the focus position, so you can return to the exact same focus setting across multiple measurements or sessions. This eliminates operator-dependent variability and improves long-term consistency.

Can I upgrade the aperture size later?

The aperture is integral to the interferometer design and is not field-upgradable. Choose the 4-inch or 6-inch version based on your current and anticipated part sizes to avoid needing a second instrument. Select the aperture that matches your largest typical part to maximize instrument utilization.

What types of parts can the Verifire MST measure?

It is designed for flat and spherical surfaces, including optical flats, mirrors, lenses, and prisms. The 1.55 µm wavelength also allows measurement of materials like silicon and germanium that are opaque at visible wavelengths.

How do I maintain calibration on the Verifire MST?

Zygo recommends annual calibration using certified reference standards. The encoded focus and fixed magnification help maintain calibration stability, but environmental factors like temperature and vibration also affect accuracy. Schedule annual calibration and control the measurement environment for best results.

Product Facts

• 1.55 µm Verifire MST Interferometer: 4-inch aperture, 1X fixed magnification, encoded focus, 1.55 μm wavelength. The 4-inch aperture balances field of view and resolution for most precision optics, while encoded focus eliminates manual refocusing errors.

  

• 1.55 µm Verifire Interferometer with 6 in. Aperture: 6-inch aperture, Verifire MST configuration with 1X fixed magnification and encoded focus. The 6-inch aperture accommodates larger parts or multiple components in a single measurement, improving throughput in high-volume inspection.