March 2022
·
22 Reads
This page lists works of an author who doesn't have a ResearchGate profile or hasn't added the works to their profile yet. It is automatically generated from public (personal) data to further our legitimate goal of comprehensive and accurate scientific recordkeeping. If you are this author and want this page removed, please let us know.
March 2022
·
22 Reads
February 2022
·
217 Reads
·
19 Citations
Coherent frequency division of high-stability optical sources permits the extraction of microwave signals with ultra-low phase noise, enabling their application to systems with stringent timing precision. To date, the highest performance systems have required tight phase stabilization of laboratory grade optical frequency combs to Fabry–Pérot optical reference cavities for faithful optical-to-microwave frequency division. This requirement limits the technology to highly controlled laboratory environments. Here, we employ a transfer oscillator technique, which employs digital and RF analog electronics to coherently suppress additive optical frequency comb noise. This relaxes the stabilization requirements and allows for the extraction of multiple independent microwave outputs from a single comb, while at the same time, permitting low-noise microwave generation from combs with higher noise profiles. Using this method, we transferred the phase stability of two high-finesse optical sources at 1157 and 1070 nm to two independent 10 GHz signals using a single frequency comb. We demonstrated absolute phase noise below −106 dBc/Hz at 1 Hz from the carrier with corresponding 1 s fractional frequency instability below 2 × 10−15. Finally, the latter phase noise levels were attainable for comb linewidths broadened up to 2 MHz, demonstrating the potential for out-of-lab use with low SWaP lasers.
October 2021
·
73 Reads
Coherent frequency division of high-stability optical sources permits the extraction of microwave signals with ultra-low phase noise, enabling their application to systems with stringent timing precision. To date, the highest performance systems have required tight phase stabilization of laboratory grade optical frequency combs to Fabry-Perot optical reference cavities for faithful optical-to-microwave frequency division. This requirement limits the technology to highly-controlled laboratory environments. Here, we employ a transfer oscillator technique, which employs digital and RF analog electronics to coherently suppress additive optical frequency comb noise. This relaxes the stabilization requirements and allows for the extraction of multiple independent microwave outputs from a single comb, while at the same time, permitting low-noise microwave generation from combs with higher noise profiles. Using this method we transferred the phase stability of two high-Finesse optical sources at 1157 nm and 1070 nm to two independent 10 GHz signals using a single frequency comb. We demonstrated absolute phase noise below -106 dBc/Hz at 1-Hz from carrier with corresponding 1 second fractional frequency instability below . Finally, the latter phase noise levels were attainable for comb linewidths broadened up to 2 MHz, demonstrating the potential for out-of lab use with low SWaP lasers.
January 2021
·
35 Reads
We generate 10 GHz microwave signals from an optical reference cavity using the transfer oscillator scheme with a free-running optical frequency comb. We demonstrate phase noise < -100 dBc/Hz at 1 Hz frequency offset from the carrier.
May 2020
·
58 Reads
·
5 Citations
An amendment to this paper has been published and can be accessed via a link at the top of the paper.
January 2020
·
30 Reads
We generate a high stability 10 GHz microwave signals with close to 30 dB of comb noise suppression via optical frequency division using a transfer oscillator scheme.
December 2019
·
2,320 Reads
·
733 Citations
Optical frequency combs were developed nearly two decades ago to support the world’s most precise atomic clocks. Acting as precision optical synthesizers, frequency combs enable the precise transfer of phase and frequency information from a high-stability reference to hundreds of thousands of tones in the optical domain. This versatility, coupled with near-continuous spectroscopic coverage from microwave frequencies to the extreme ultra-violet, has enabled precision measurement capabilities in both fundamental and applied contexts. This review takes a tutorial approach to illustrate how 20 years of source development and technology has facilitated the journey of optical frequency combs from the lab into the field.
September 2019
·
214 Reads
Optical frequency combs were developed nearly two decades ago to support the world's most precise atomic clocks. Acting as precision optical synthesizers, frequency combs enable the precise transfer of phase and frequency information from a high-stability reference to hundreds of thousands of tones in the optical domain. This versatility, coupled with near-continuous spectroscopic coverage from the terahertz to the extreme ultra-violet, has enabled precision measurement capabilities in both fundamental and applied contexts. This review takes a tutorial approach to illustrate how 20 years of source development and technology has facilitated the journey of optical frequency combs from the lab into the field.
... 一种是通过反馈控制光梳重复频率 frep 来稳定光梳的一条特定谱线到光学参考 [55,56] , 而光 梳载波包络频率 fceo 被锁定到微波频率参考, 因此 frep 可以作为种子源, 通过使用如直接数字合成器(DDS) 的下变频产生时钟频率. 另一种是传递振荡器技术 [57,58] , 即基于合理的混频, 滤波和分频以免疫光梳噪 声的影响, 再通过电学网络可将光频率转换为具有 超高同步性的微波频率. Page 8 of 14 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 其中∆qi(t)表征激光频率和时钟频率间的同源水平, 该噪声在空间引力波探测科学频段内已被实验证明 是非常小的 [60] , 因此本文分析中将忽略这一项的影 响. 基于式 (19), 式(7-8)所示的六个组合数据流可被 重写为: (20) 从上式可见, 在光梳连接的情况下, 时钟噪声可被等 效地转换为激光频率噪声, 因此只需利用光梳 TDI 算法抑制该等效的激光频率噪声即可 [25,26] . ...
Reference:
空间引力波探测中的时钟噪声抑制技术研究进展
February 2022
... O wing to the widespread applications in both scientific research and industries such as frequency combbased spectroscopy, [1][2][3] laser processing, 4,5) and bio-imaging, 6) high repetition rate fiber lasers have been developed intensively and many breakthroughs have been achieved. Techniques such as active mode-locking, 7) passively harmonic mode-locking, 8,9) dissipative four-wave mixing 10) and mode filtering 11) could achieve a very high repetition rate, however, they exhibit a higher instability in terms of output performance compared to fundamentally passive mode-locking. ...
May 2020
... In the optical realm, optical parametric coupling has played a major role in quantum engineering endeavors. [11][12][13][14][15][16][17] Optical frequency combs (FCs), 18,19 squeezed laser, 20 and squeezed optical frequency combs 13 have gained recognition as formidable tools for precision metrology and spectroscopy, positioning themselves as strong contenders for quantum processing. [21][22][23][24] The landscape of frequency comb (FC) research has seen a rich tapestry of studies delving into nonlinear processes, unveiling techniques for generating bosonic FCs. ...
December 2019