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Nonlinear Optics
Coherent link between a Ti:sapphire comb and a 1.5 μm laser via nonlinear interaction in photonic crystal fiber
Yuan Yao
1
Haosen Shi
1
Guang Yang
1
Bo Li
1
[ ... ]
Yanyi Jiang
1,2,*
Author Affiliations
Abstract
1
State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
2
Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China
Optical clock networks have distinct advantages for the dissemination of time/frequency, geodesy, and fundamental research. To realize such a network, the telecom band and optical atomic clocks have to be coherently bridged. Since the telecom band and optical atomic clocks reside in a distinct spectral region, second-harmonic generation is usually introduced to bridge the large frequency gap. In this paper, we introduce a new method to coherently link a 1550 nm continuous wave laser with a Ti:sapphire mode-locked laser-based optical frequency comb. By coupling the 1550 nm continuous wave laser light and the Ti:sapphire comb light together into a photonic crystal fiber, nonlinear interaction takes place, and new comblike frequency components related to the 1550 nm laser frequency are generated in the visible region. Consequently, we can detect beat notes between two combs in the visible region with a signal-to-noise ratio of more than 40 dB in a resolution bandwidth of 300 kHz. With this signal, we realize an optical frequency divider for converting the frequency of optical clocks in the visible region to the telecom band at 1.55 μm. An out-of-loop measurement shows that the additional noise and uncertainty induced in optical frequency conversion are
5
×
10
-
18
at 1 s averaging time and
2.2
×
10
-
19
, respectively, which are limited by the uncompensated light path fluctuation but fulfill precision measurement using state-of-the-art optical clocks.
PDF全文
Full Text
Photonics Research
2024, 12(2): 350
Atomic and Molecular Optics
Frequency control of a lattice laser at 759 nm by referencing to Yb clock transition at 578 nm
Download:541次
Yaqin Hao
Yuan Yao
*
Haosen Shi
Hongfu Yu
[ ... ]
Longsheng Ma
Author Affiliations
Abstract
State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
We present the frequency control of a 759 nm laser as a lattice laser for an ytterbium (Yb) optical clock. The frequency stability and accuracy are transferred from the Yb optical clock via an optical frequency comb. Although the comb is frequency-stabilized on a rubidium microwave clock, the frequency instability of the 759 nm laser is evaluated at the
10
-
15
level at 1 s averaging time. The frequency of the 759 nm laser is controlled with an uncertainty within 1 Hz by referencing to the Yb clock transition. Such a frequency-controlled 759 nm laser is suitable for Yb optical clocks as the lattice laser. The technique of laser frequency control can be applied to other lasers in optical clocks.
optical clock
optical frequency comb
laser frequency stabilization
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Chinese Optics Letters
2022, 20(12): 120201
Atomic and Molecular Optics
Automatic, long-term frequency-stabilized lasers with sub-hertz linewidth and 10
−16
frequency instability
Chengzhi Yan
Haosen Shi
*
Yuan Yao
Hongfu Yu
[ ... ]
Longsheng Ma
Author Affiliations
Abstract
State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
We report two ultra-stable laser systems automatically frequency-stabilized to two high-finesse optical cavities. By employing analog-digital hybrid proportional integral derivative (PID) controllers, we keep the merits of wide servo bandwidth and servo accuracy by using analog circuits for the PID controller, and, at the same time, we realize automatic laser frequency locking by introducing digital logic into the PID controller. The lasers can be automatically frequency-stabilized to their reference cavities, and it can be relocked in 0.3 s when interruption happens, i.e., blocking and unblocking the laser light. These automatic frequency-stabilized lasers are measured to have a frequency instability of
6
×
10
-
16
at 1 s averaging time and a most probable linewidth of 0.3 Hz. The laser systems were tested for continuous operation over 11 days. Such ultra-stable laser systems in long-term robust operation will be beneficial to the applications of optical atomic clocks and precision measurement based on frequency-stabilized lasers.
narrow-linewidth laser
automatic frequency stabilization
optical atomic clock
gravitational wave detection
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Full Text
Chinese Optics Letters
2022, 20(7): 070201
Lasers, Optical Amplifiers, and Laser Optics
Long-term frequency-stabilized optical frequency comb based on a turnkey Ti:sapphire mode-locked laser
Download:648次
Guang Yang
1
Haosen Shi
1,*
Yuan Yao
1,**
Hongfu Yu
1
[ ... ]
Longsheng Ma
1
Author Affiliations
Abstract
1
State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
2
Novanta Europe GmbH, Garching 85748, Germany
We report a long-term frequency-stabilized optical frequency comb at 530–1100 nm based on a turnkey Ti:sapphire mode-locked laser. With the help of a digital controller, turnkey operation is realized for the Ti:sapphire mode-locked laser. Under optimized design of the laser cavity, the laser can be mode-locked over a month, limited by the observation time. The combination of a fast piezo and a slow one inside the Ti:sapphire mode-locked laser allows us to adjust the cavity length with moderate bandwidth and tuning range, enabling robust locking of the repetition rate (
f
r
) to a hydrogen maser. By combining a fast analog feedback to pump current and a slow digital feedback to an intracavity wedge and the pump power of the Ti:sapphire mode-locked laser, the carrier envelope offset frequency (
f
ceo
) of the comb is stabilized. We extend the continuous frequency-stabilized time of the Ti:sapphire optical frequency comb to five days. The residual jitters of
f
r
and
f
ceo
are 0.08 mHz and 2.5 mHz at 1 s averaging time, respectively, satisfying many applications demanding accuracy and short operation time for optical frequency combs.
optical frequency comb
Ti:sapphire mode-locked laser
phase lock
optical atomic clock
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Full Text
Chinese Optics Letters
2021, 19(12): 121405
Instrumentation and Measurements
Optical frequency synthesizer referenced to an ytterbium optical clock
Download:653次
Yuan Yao
1†
Bo Li
1†
Guang Yang
1
Xiaotong Chen
1
[ ... ]
Longsheng Ma
1,2,4,*
Author Affiliations
Abstract
1
State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
2
Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China
3
e-mail: yyjiang@phy.ecnu.edu.cn
4
e-mail: lsma@phy.ecnu.edu.cn
Optical clocks with an unprecedented accuracy of
10
-
18
promise innovations in precision spectroscopy and measurement. To harness the full power of optical clocks, we need optical frequency synthesizers (OFSs) to accurately convert the stabilities and accuracies of optical clocks to other desired frequencies. This work demonstrates such an OFS referenced to an ytterbium optical clock. The OFS is based on an optical frequency comb phase-locked to a commercial rubidium microwave clock; in this way most combs can operate robustly. Despite comb frequency instability at
10
-
11
, the synthesis noise and uncertainty reach
6
×
10
-
18
(1 s) and
5
×
10
-
21
, respectively, facilitating frequency synthesis of the best optical clocks. In the OFS, the coherence of the OFS internal oscillator at 1064 nm is accurately transferred to a 578 nm laser for resolving the hertz-level-linewidth ytterbium clock transition (unaffected by megahertz-linewidth comb lines) and faithfully referencing the OFS to an ytterbium optical clock.
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Full Text
Photonics Research
2021, 9(2): 02000098
Atomic and Molecular Optics
Laser stabilizing to ytterbium clock transition with Rabi and Ramsey spectroscopy
Download:965次
Yuxin Sun
Yuan Yao
*
Yaqin Hao
Hongfu Yu
[ ... ]
Longsheng Ma
Author Affiliations
Abstract
State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
A cavity-stabilized 578 nm laser is used to probe the clock transition of ytterbium atoms trapped in optical lattice sites. We obtain a Fourier-limited 4.2-Hz-linewidth Rabi spectrum and a Ramsey spectrum with fringe linewidth of 3.3 Hz. Based on one of the spectra, the 578 nm laser light is frequency-stabilized to the center of the transition to achieve a closed-loop operation of an optical clock. Based on interleaved measurement, the frequency instability of a single optical clock is demonstrated to be 5.4 × 10
?16
/√τ.
optical clock
laser frequency stabilization
precision spectroscopy
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Chinese Optics Letters
2020, 18(7): 070201
Atomic and Molecular Optics
Laser frequency instability of 6 × 10
−16
using 10-cm-long cavities on a cubic spacer
Download:1099次
Xiaotong Chen
1
Yanyi Jiang
1,*
Bo Li
1
Hongfu Yu
1
[ ... ]
Longsheng Ma
1
Author Affiliations
Abstract
1
State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
2
Key Laboratory of Time and Frequency Primary Standards, National Time Service Center, Xi’an 710600, China
3
AVIC Xi’an Flight Automatic Control Research Institute, Xi’an 710065, China
We demonstrate two ultra-stable laser systems at 1064 nm by independently stabilizing two 10-cm-long Fabry–Pérot cavities. The reference cavities are on a cubic spacer, which is rigidly mounted for both low sensitivity to environmental vibration and ability for transportation. By comparing against an independent ultra-stable laser at 578 nm via an optical frequency comb, the 1064 nm lasers are measured to have frequency instabilities of 6 × 10
?16
at 1 s averaging time.
laser stabilization
Fabry-Pérot cavity
linewidth
PDF全文
Full Text
Chinese Optics Letters
2020, 18(3): 030201
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