Demonstration of Chilas COMET Swept Source Laser in Action
In a previous article, we introduced the Chilas COMET Swept Source Laser and its potential for various applications. To show the capabilities of our laser, we have conducted a demonstration experiment, focusing on the laser’s potential for spectroscopy and sensing. Especially, to highlight the laser’s sweeping performance, we have set up an absorption spectrum measurement of a reference gas cell.
Experimental Setup
We recorded the gas cell’s transmission via a photodiode linked to an oscilloscope. The gas cell contains HCN, as its absorption lines fall within the emission wavelength range of the laser. The laser sweeps continuously at a rate of 40 nm per second, completing each full sweep within one second. To synchronize the data recording with the oscilloscope, a trigger signal is sent out by the laser at the start of every sweep. After performing a time-to-wavelength conversion, we observe the expected absorption spectrum, confirming that the laser accurately covers all wavelengths within this sweep range.
High-Resolution Spectral Data
To further examine our laser’s accuracy and resolution, we zoom into a single absorption line and compare it with a simulation based on HITRAN data. As shown in the graph, the narrow absorption line is accurately resolved. A minor offset of 6 pm can be seen between the simulated and measured peak. Despite a 4 pm step size of the sweep (indicated by the dots on the graph), the laser precisely covers intermediate wavelengths as well.
This demonstration confirms the Swept Source Laser’s accuracy and resolution, making it suitable for high-precision spectroscopy and sensing.
For more information about the laser and its capabilities, check out our main article on the Chilas Swept Source Laser.
Article written by our laser expert Albert van Rees.
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