Spectrally narrow, long-term stable optical frequency reference based on a Eu${}^{3+}$:Y${}_2$SiO${}_5$ crystal at cryogenic temperature

Abstract

Using an ultrastable continuous-wave laser at 580 nm we performed spectral hole burning of Eu${}^{3+}$:Y${}_2$SiO${}_5$ at very high spectral resolution. Essential parameters determining the usefulness as a "macroscopic" frequency reference: linewidth, temperature sensitivity, long-term stability were characterized, using a H-maser stabilized frequency comb. Spectral holes with linewidth as low as 6 kHz were observed and the upper limit of the drift of the hole frequency was determined to be on the order of 5$\pm$3 mHz/s. We discuss necessary requirements for achieving ultra-high-stability in laser frequency stabilization to these spectral holes.

4 pages, 4 figures

References in corpus (4)

• Making optical atomic clocks more stable with $10^{-16}$ level laser stabilization
• Frequency-stabilization to 6x10^-16 via spectral-hole burning
• A narrow-linewidth external cavity quantum dot laser for high-resolution spectroscopy in the near-infrared and yellow spectral ranges
• Demonstration of a Transportable 1 Hz-Linewidth Laser

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