Science, Space and Technology News 2024
Pioneering work in laser physics has laid the foundation for significant advancements in precision measurement, enabling the development of techniques that significantly reduce residual amplitude modulation.
While physicists have used the PDH method for decades in ensuring their laser frequency is stably “locked” to an artificial or quantum reference, a limitation arising from the frequency modulation process itself, called residual amplitude modulation , can still affect the stability andpaper, Ye’s team, working with JILA electronic staff member Ivan Ryger and Hall, describe implementing a new approach for the PDH method, reducing RAM to never-before-seen minimal levels while simultaneously...
Physicists can then use these combined light beams to interrogate different environments, such as an optical cavity made of mirrors. To do this, the researchers must “lock” the laser to the cavity, that is, have the laser probe the cavity at a particular frequency. As the JILA researchers quickly realized, along with the rest of the laser physics community, reducing this RAM is crucial for improving the stability of the PDH technique and, in turn, their laser measurements. Overcoming the RAM problem has been a long struggle, but the new approach would make the fight much easier.The two-reference-light “sidebands” are essential for the PDH locking method.
“EOMs add sidebands to the carrier laser in the optical domain, which is more challenging for us to control,” Kedar explained. “So instead, we can try to generate these sidebands in the electronic domain and translate them to the optical by using an AOM.”
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