Selection and amplification of a single optical frequency comb mode for laser cooling of the strontium atoms in an optical clock

Liu, Hui; Yin, Mojuan; Kong, Dehuan; Xu, Qianfan; Zhang, Shougang; Chang, Hong

doi:10.1063/1.4933259

Cited by 14 publications

(9 citation statements)

References 31 publications

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“…dP abs dz = − g abs A eff P p P abs + 𝛼P abs (5) where P p , P s1 , P s2 , P s3 and P abs denote the power of the five light waves shown in Figure 1b, 𝛼 is the loss coefficient of the fiber, and g B (f ) represents the BGS given by:…”

Section: Principle Of Operation and Numerical Modelmentioning

confidence: 99%

“…However, in some applications where frequency standards with high power and high signal-to-noise ratio (SNR) are required, the lines in OFCs are difficult to be employed directly. The extraction and manipulation of DOI: 10.1002/lpor.202300769 one or several comb lines can greatly enrich the applications of OFCs, for instance, atoms cooling, [5] spectroscopy, [6,7] microwave photonics, [8][9][10] and arbitrary optical waveform generation. [11,12] Furthermore, any arbitrary line extracted from the wide spectrum of an OFC can serve as an outstanding singlelongitudinal-mode continuous-wave (CW) laser, namely a high-precision optical synthesizer.…”

Section: Introductionmentioning

confidence: 99%

“…Another method is optical injection locking, which selectively amplifies a specific OFC line by injecting the OFC into a diode laser operating at a frequency close to the desired line. [5,6,9,[17][18][19] In this method, achieving a narrow locking range for the tight mode spacing while simultaneously obtaining a high amplification gain is challenging, and a narrow locking range may result in a less robust locking state. [18] Stimulated Brillouin scattering (SBS) is a nonlinear effect with a low threshold in optical fibers, [20] which has become one of the main obstacles in power scaling of single-frequency fiber amplifiers and needs to be suppressed.…”

Section: Introductionmentioning

confidence: 99%

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Highly Discriminative Amplification of a Single Frequency Comb Line

Xiong,

Zhou,

Cao

et al. 2023

Laser & Photonics Reviews

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The optical power of a single line in optical frequency combs (OFCs) is inherently weak, so the extraction and amplification of a single OFC line is required for many high‐precision applications. In this work, a high gain, narrowband, and all‐polarization‐maintaining (PM) fiber Brillouin amplifier is introduced to address this issue. The use of PM fiber as the gain medium provides higher Brillouin gain and avoids polarization sensitivity to thermal and acoustic disturbance. The gain fiber is reduced to tens of meters with higher pump power, which is beneficial for the phase quality of the amplified comb line. Numerical simulations and experiments are performed to investigate the features of the Brillouin amplification process for an individual OFC line. Notably, direct generation of a Watt‐level single‐mode laser from an OFC is demonstrated, with a signal‐to‐noise‐ratio (SNR) of 47 dB and a side‐mode‐suppression‐ratio (SMSR) exceeding 60 dB, which represents the highest power, and best SNR and SMSR performance ever reported, to the best of the knowledge.

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Section: Principle Of Operation and Numerical Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Highly Discriminative Amplification of a Single Frequency Comb Line

Xiong,

Zhou,

Cao

et al. 2023

Laser & Photonics Reviews

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show abstract

“…Injection locking of a diode laser is essential in a majority of fields, such as laser spectroscopy [1,2], laser cooling and trapping [3][4][5][6][7][8], optical communication [9][10][11] and highprecision metrology [12][13][14][15]. It allows phase and frequency locking of a "slave" laser in reference to a "master" laser by an optical link [16].…”

Section: Introductionmentioning

confidence: 99%

Active control of a diode laser with injection locking

Chen¹,

Seo²,

Huang³

et al. 2021

Preprint

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We present a simple and effective method to implement an active stabilization of a diode laser with injection locking, which requires minimal user intervenes. The injection locked state of the diode laser is probed by a photodetector, of which sensitivity is enhanced by a narrow laser-line filter. Taking advantage of the characteristic response of laser power to spectral modes from the narrow laser-line filter, we demonstrate that high spectral purity and low intensity noise of the diode can be simultaneously maintained by an active feedback to the injected laser. Our method is intrinsically cost-effective, and does not require bulky devices, such as Fabry-Perot interferometers or wavemeters, to actively stabilize the diode laser. Based on successful implementation of this method in our quantum gas experiments, it is conceivable that our active stabilization will greatly simplify potential applications of injection locking of diode lasers in modularized or integrated optical systems.

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“…[1][2][3][4][5][6][7] Such optical frequency synthesizers have been used for optical clocks. 8) Recently, Rydberg atoms, highly excited states of atoms with a large principal quantum number, have become attractive because quantum entanglement between nearby atoms is relatively simple to realize by using the long-range interaction between Rydberg atoms.…”

Section: Introductionmentioning

confidence: 99%

Optical frequency synthesizer for precision spectroscopy of Rydberg states of Rb atoms

Watanabe

Tamura

Musha

et al. 2017

Jpn. J. Appl. Phys.

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We have developed an optical frequency synthesizer for the precision spectroscopy of highly excited Rydberg states of Rb atoms. This synthesizer can generate a widely tunable 480 nm laser light with an optical power of 150 mW and an absolute frequency uncertainty of less than 100 kHz using a high-repetition-rate (325 MHz) Er fiber-based optical frequency comb and a tunable frequency-doubled diode laser at 960 nm. We demonstrate the precision two-photon spectroscopy of the Rydberg states of 87Rb atoms by observing the electromagnetically induced transparency in a vapor cell, and measure the absolute transition frequencies of 87Rb to nD (n = 53–92) and nS (n = 60–90) Rydberg states with an uncertainty of less than 250 kHz. It is the first direct frequency measurements of these transitions using an optical frequency comb.

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Selection and amplification of a single optical frequency comb mode for laser cooling of the strontium atoms in an optical clock

Cited by 14 publications

References 31 publications

Highly Discriminative Amplification of a Single Frequency Comb Line

Highly Discriminative Amplification of a Single Frequency Comb Line

Active control of a diode laser with injection locking

Optical frequency synthesizer for precision spectroscopy of Rydberg states of Rb atoms

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