AI Article Synopsis
- Characterizing laser frequency noise is crucial for optical applications like sensing and communication, but existing measurement methods struggle with ultra-narrow linewidth lasers.
- The new method uses a high-finesse plano-concave optical microresonator (PCMR) as a frequency discriminator to measure noise across a large frequency range.
- An array of PCMRs with varied thicknesses allows for measurements from 15 Hz to under 100 MHz, covering wavelengths from 1440 to 1630 nm, with tests on four lasers showing results comparable to a commercial noise analyzer.
Article Abstract
Characterizing laser frequency noise is essential for applications including optical sensing and coherent optical communications. Accurate measurement of ultra-narrow linewidth lasers over a wide frequency range using existing methods is still challenging. Here we present a method for characterizing the frequency noise of lasers using a high-finesse plano-concave optical microresonator (PCMR) acting as a frequency discriminator. To enable noise measurements at a wide range of laser frequencies, an array of PCMRs was produced with slight variations of thickness resulting in a series of discriminators operating at a series of periodical frequencies. This method enables measuring the frequency noise over a wide linewidth range (15 Hz to <100 MHz) over the 1440-1630 nm wavelength range. To assess the performance of the method, four different lasers were characterized, and the results were compared to the estimations of a commercial frequency noise analyzer.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11023065 | PMC |
| http://dx.doi.org/10.1364/OL.510516 | DOI Listing |
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