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Multimodal Optical Imaging Platform for Studying Cellular Metabolism

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Compact multipass optical cell for laser spectroscopy.

Béla Tuzson¹, Markus Mangold, Herbert Looser

¹Empa, Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Switzerland. bela.tuzson@empa.ch

|February 6, 2013

Summary

A novel multipass cell (MPC) offers a compact and robust design for laser absorption spectroscopy. This innovative optical cell enables flexible path-length adjustments for precise isotope ratio measurements of carbon dioxide (CO2).

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Area of Science:

Optical Engineering
Spectroscopy
Environmental Science

Background:

Traditional multipass cells (MPCs) often lack compactness and robustness.
There is a need for versatile optical cells in laser absorption spectroscopy for precise measurements.

Purpose of the Study:

To present a novel multipass cell (MPC) design optimized for compactness, robustness, low volume, and ease of use.
To demonstrate the cell's capability for high-precision isotope ratio measurements of carbon dioxide (CO2).

Main Methods:

Designed a multipass cell (MPC) utilizing a single piece of reflective toroidal surface to form a near-concentric cavity.
Achieved flexible path-length adjustments by altering the laser beam's aiming angle at the entrance window.
Demonstrated suitability for CO2 isotope ratio measurements using effective optical path lengths of 2.2 m and 4.1 m.

Main Results:

The developed MPC features a compact volume of only 40 cm(3).
The design allows for adaptable optical path lengths, a departure from traditional MPCs.
The cell proved effective for high-precision isotope ratio measurements of CO2 at varying concentrations.

Conclusions:

The presented multipass cell (MPC) design is a significant advancement in optical cell technology for laser absorption spectroscopy.
Its compact, robust, and flexible nature makes it ideal for demanding applications, including precise CO2 isotope analysis.