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High performance molecular iodine optical reference using an unsaturated vapor cell.

Zhenqi Zhang1, Wen You1, Xingyue Liu1

  • 1National Precise Gravity Measurement Facility and MOE Key Laboratory of Fundamental Physical Quantities Measurement, School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China.

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|June 13, 2024
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Summary
This summary is machine-generated.

This study presents a stable optical frequency reference using molecular iodine (I2) and modulation transfer spectroscopy. An unsaturated iodine vapor cell enabled a compact, room-temperature laser with excellent long-term frequency instability.

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Area of Science:

  • Atomic, Molecular, and Optical Physics
  • Laser Spectroscopy
  • Metrology

Background:

  • Optical frequency references are crucial for precision measurements and advanced technologies.
  • Molecular iodine (I2) spectroscopy offers a rich set of hyperfine transitions for frequency stabilization.
  • Existing iodine-stabilized lasers often require complex temperature control or saturated cells.

Purpose of the Study:

  • To develop a high-performance, compact, and stable optical frequency reference based on molecular iodine.
  • To investigate the feasibility of using an unsaturated iodine vapor cell for long-term frequency stability.
  • To achieve frequency instability comparable to the best reported results for iodine-stabilized lasers.

Main Methods:

  • Utilized modulation transfer spectroscopy (MTS) for frequency stabilization.
  • Designed and employed an unsaturated molecular iodine (I2) vapor cell operating at room temperature.
  • Developed a compact, frequency-stabilized laser system referenced to the R(56)32-0: a1 hyperfine transition of I2.

Main Results:

  • Demonstrated a fractional frequency instability of 1.4 × 10⁻¹⁴ at 1 second.
  • Achieved a fractional frequency instability of 1.7 × 10⁻¹⁵ at 10⁴ seconds.
  • The performance at 10⁴ seconds is comparable to the best previously reported iodine-stabilized lasers.

Conclusions:

  • An unsaturated molecular iodine (I2) vapor cell is a viable approach for developing long-term, stable optical frequency references.
  • Room-temperature operation without active temperature stabilization simplifies the system design.
  • This work paves the way for more accessible and robust iodine-based optical clocks and frequency standards.