IdealPhotonics' single-pass and multi-pass gas cells offer several advantages. The single-pass gas cell allows light to pass through the gas sample in one pass, resulting in a simple structure but short optical path, suitable for rapid detection. The multi-pass gas cell, on the other hand, allows light to pass through the gas multiple times through reflection, significantly extending the optical path and improving detection sensitivity, but its structure is more complex.The single-pass gas cell is simple in structure, has a short optical path, and is low in cost, making it suitable for rapid detection, but its sensitivity is limited. The multi-pass gas cell, which extends the optical path and significantly improves sensitivity through multiple reflections, has a complex structure and requires precise calibration.