# Fabrication and characterization of super-polished wedged borosilicate nano-cells

## TL;DR

This paper details the fabrication of ultra-smooth, wedge-shaped borosilicate nano-cells with variable thickness, demonstrating their potential for precise atom-surface interaction studies and optical applications.

## Contribution

It introduces a novel fabrication process for super-polished, wedge-shaped borosilicate nano-cells with ultra-low surface roughness, enabling advanced atomic physics experiments.

## Key findings

- Achieved surface roughness of 1 Å rms
- Successfully fabricated variable-thickness nano-cells
- Demonstrated optical spectra of Cesium D1 line

## Abstract

We report on the fabrication of an all-glass vapor cell with a thickness varying linearly between (exactly) 0 and ~ 1 {\mu}m. The cell is made in Borofloat glass that allows super polish roughness, a full optical bonding assembling and easy filling with alkali vapors. We detail the challenging manufacture steps and present experimental spectra resulting from off-axis fluorescence and transmission spectroscopy of the Cesium D1 line. The very small surface roughness of 1 Angstr\"om rms is promising to investigate the atom-surface interaction or to minimize parasite stray light.