Reference cells contain vapors from specific atomic elements or molecular compounds, each of which has a well-defined absorption spectrum. These cells are commonly used in spectroscopic applications such as tunable diode laser calibration, stabilization of laser frequencies, and calibration of wavelength meters. Thorlabs offers both pyrex and quartz reference cells that contain a range of standard fill materials. All of the cells offered here have been baked and evacuated to 10-8 torr in order to remove contaminants. Additionally, each cell is helium leak checked to ensure the longevity of the vapor cell. Custom reference cells can be manufactured upon request.
Since each fill material is associated with a unique absorption spectrum that serves as its fingerprint, the contents of a reference cell can be determined via a linear absorption measurement (as depicted by the simplified schematic above). By scanning a tunable diode laser over a wavelength range and detecting light absorption (A) with a photodetector, a series of peaks will be recorded, which is characteristic of the gas inside the cell.
These reference cells can only be shipped from the United States and may incur special handling charges, particularly for our customers located outside the U.S. Please contact Sales
for a shipping quote. Due to hazardous materials shipping regulations, we are currently unable to ship our reference cells to Brazil, China, or Uruguay.