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Related Experiment Video

Updated: Jun 26, 2026

Correction of Presbyopia by Monocular Bi-Aspheric Ablation Profile

Published on: September 20, 2024

A rapid method to correct objective lens astigmatism in a TEM.

Q Xing¹, T A Lograsso

¹Materials Sciences, Ames Laboratory, Ames, IA 50011, USA. qfxingtem@gmail.com

Ultramicroscopy

|January 20, 2009

Summary

This study presents a fast and simple method to correct transmission electron microscope (TEM) astigmatism using the caustic curve. This technique avoids the need for apertures or amorphous materials, improving imaging quality.

Related Experiment Videos

Last Updated: Jun 26, 2026

Correction of Presbyopia by Monocular Bi-Aspheric Ablation Profile

Published on: September 20, 2024

Area of Science:

Physical Sciences
Materials Science
Microscopy

Background:

Astigmatism in transmission electron microscopes (TEM) degrades image resolution.
Accurate correction of objective lens astigmatism is crucial for high-quality TEM imaging.
Existing methods for astigmatism correction can be time-consuming or require specific sample features.

Purpose of the Study:

To introduce a rapid and straightforward method for correcting two-fold astigmatism in TEM objective lenses.
To demonstrate the utility of the caustic curve for astigmatism correction without an objective aperture.
To offer an alternative astigmatism correction technique that bypasses the need for holes or amorphous materials.

Main Methods:

Utilizing the caustic curve generated by the objective lens.
Employing the objective lens stigmators for astigmatism correction.
Performing correction after initial condenser lens astigmatism adjustment.

Main Results:

Successfully corrected two-fold astigmatism in the TEM objective lens.
Achieved astigmatism correction by rounding the caustic curve.
Demonstrated a method that is fast and straightforward to implement.

Conclusions:

The caustic curve method provides an efficient way to correct TEM objective lens astigmatism.
This technique offers significant advantages in speed and simplicity over traditional methods.
The absence of required apertures or amorphous materials broadens the applicability of this correction method.