attoCFM II
low temperature scanning confocal microscopes, highly stable and compact
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The attoCFMII is an ultra compact confocal microscope which is miniaturized for in-situ analysis. The microscope is highly stable at low temperatures, high magnetic fields and high vacuum. Moreover, all mechanical parts are thermally compensated. The design is optimized to minimize the light losses and to capture the maximum amount of light scattered by the illuminated point of the sample.

This one-of-a-kind combination of materials allows absolutely stable single dot measurements at low temperatures over weeks, even when refilling a bath cryostat with liquid Helium. That opens up new possibilities in cryogenic long-term investigations. A new dimension of miniaturization has been realized by adapting the attoCFMII for cryostat / dewar bore sizes down to 1 inch (25.4mm)! The brand new attoCFMIIxs has been introduced recently enabling highest quality optical investigations with minimal spacial requirements.

Principle - A laser beam is coupled into one arm of a single mode optical fiber coupler. The fiber end of the second arm is placed in a ceramic ferrule to guarantee an accurate position of the fiber in the objective axis. This single mode fiber illuminates the sample and plays the role of the blocking pinhole aperture when collecting the scattered light from the sample.

Objective Systems - Objectives with a large working distance of up to 7mm or with a numerical aperture of up to 0.65 are available. An overview on the 4 different objectives available is listed in the table in the ‘low temperature confocal objectives’ section. An increase of the numerical aperture by a half ball sapphire lens (solid immersion lens) is possible, thus leading to a resolution of 150 - 300nm (with red laser light illumination).

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Detailed Specification Sheet

Complete System Solutions:
LTSYS	Complete system configurations for this product.