top-entry stage
top-entry stage
A specimen stage into which the specimen is inserted from above the polepiece of the objective lens. The "top-entry stage" has a construction where the specimen holder is rotationally symmetric with respect to the optical axis because it is inserted in the objective lens from the top. Since this stage is stable to vibrations and heating, it is advantageous for high-resolution image observation in an ultra-high voltage electron microscope, etc. However, due to the construction of the top-entry stage, large tilt angles of a specimen cannot be achieved, and analytical functions (tools) are difficult to be added. Due to these disadvantages, the side-entry stage is used for an analytical electron microscope.
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