Fei Meng
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View article: High‐Precision Laser Spectrum Analyzer via Digital Decoherence
High‐Precision Laser Spectrum Analyzer via Digital Decoherence Open
With the continuous advancement of laser technology, accurately evaluating the noise spectrum of high‐performance lasers has become increasingly challenging. In this work, we demonstrate a high‐precision laser spectrum analyzer based on th…
View article: High-precision laser spectrum analyzer via digital decoherence
High-precision laser spectrum analyzer via digital decoherence Open
With the continuous advancement of laser technology, accurately evaluating the noise spectrum of high-performance lasers has become increasingly challenging. In this work, we demonstrate a high-precision laser spectrum analyzer based on th…
View article: Practical 1-um GHz fiber comb on silica-based platform
Practical 1-um GHz fiber comb on silica-based platform Open
We present a fully stabilized 1-GHz Yb-fiber laser frequency comb built on silica substrates, utilizing "optical cubes" to house all optical components, ensuring long-term stability and practical operation. Both the femtosecond laser and f…
View article: Clock-offset measurement over a 50 km nonreciprocal fiber link with linear optical sampling
Clock-offset measurement over a 50 km nonreciprocal fiber link with linear optical sampling Open
We demonstrated a sub-100 picosecond level transmission stability clock-offset measurement via a 50 km nonreciprocal fiber link with a dual comb LOS technique. This experiment result supports the remote high precision time and frequency tr…
View article: Frequency-shifted <i>f</i>-2<i>f</i> interferometer for unveiling the noise performance of carrier-envelope offset in passively stabilized frequency combs
Frequency-shifted <i>f</i>-2<i>f</i> interferometer for unveiling the noise performance of carrier-envelope offset in passively stabilized frequency combs Open
The past two decades have seen rapid development of optical atomic clocks with fractional performance at 10−18 level or even below. Dissemination of optical atomic clocks into microwave domain and their intercomparisons using optical frequ…
View article: Sr Optical Lattice Clock and Precision Optical Frequency Measurement at NIM
Sr Optical Lattice Clock and Precision Optical Frequency Measurement at NIM Open
Two Sr optical lattice clocks are being built at the National Institute of Metrology of China (NIM). Sr1 was built on NIM’s Hepingli Campus. It was first evaluated in 2015 and improved later on. In 2021, the systematic shift uncertainty of…
View article: Clock-offset measurement over a 50 km nonreciprocal fiber link with linear optical sampling
Clock-offset measurement over a 50 km nonreciprocal fiber link with linear optical sampling Open
We demonstrated a sub-100 picosecond level transmission stability clock-offset measurement via a 50 km nonreciprocal fiber link with a dual comb LOS technique. This experiment result supports the remote high precision time and frequency tr…
View article: Nicotinamide mononucleotide maintains cytoskeletal stability and fortifies mitochondrial function to mitigate oocyte damage induced by Triocresyl phosphate
Nicotinamide mononucleotide maintains cytoskeletal stability and fortifies mitochondrial function to mitigate oocyte damage induced by Triocresyl phosphate Open
Triocresyl phosphate (TOCP) was commonly used as flame retardant, plasticizer, lubricant, and jet fuel additive. Studies have shown adverse effects of TOCP on the reproductive system. However, the potential harm brought by TOCP, especially…
View article: Using asynchronous optical sampling to measure timing jitter of electro-optic frequency combs
Using asynchronous optical sampling to measure timing jitter of electro-optic frequency combs Open
Electro-optic frequency combs (EOCs) are optical frequency combs constructed by phase modulation of single frequency lasers. The electro-optic modulated optical frequency combs have shown their unique advantages in many application fields …
View article: Fiber-delay-line-referenced optical frequency combs: three stabilization schemes
Fiber-delay-line-referenced optical frequency combs: three stabilization schemes Open
We demonstrate the stabilization of an optical frequency comb (OFC) using a segment of fiber delay line as a reference. A mode-locked Er-doped fiber laser is phase locked to a kilometer-long fiber delay line using three different schemes. …
View article: A High-Precision Offset Frequency Locking Technique With Delay Line Reference and AOM-Based Compensation
A High-Precision Offset Frequency Locking Technique With Delay Line Reference and AOM-Based Compensation Open
We demonstrate a high-precision, high robustness frequency offset locking method,which made the frequency offset between mode-locked laser and continuous-wave laser below less than 3 Hz.The coarse frequency lock control is realized by the …
View article: Influence of electro-optic modulator on Er-doped fiber femtosecond laser
Influence of electro-optic modulator on Er-doped fiber femtosecond laser Open
Narrow-linewidth femtosecond optical frequency comb plays an important role in the fields, such as optical clock comparison, time frequency transfer, ultrastable microwave generation, absolute distance measurement, high precision spectrosc…
View article: Sub-ps resolution clock-offset measurement over a 114 km fiber link using linear optical sampling
Sub-ps resolution clock-offset measurement over a 114 km fiber link using linear optical sampling Open
We demonstrate a sub-ps resolution clock-offset measurement based on linear optical sampling technique via a 114 km fiber link by transferring a dual optical frequency comb. The time deviation between two distance clocks is 110 fs at 1 s a…
View article: Narrow-linewidth optical frequency comb reference to a fiber delay line
Narrow-linewidth optical frequency comb reference to a fiber delay line Open
In this letter, we derive a fully-stabilized narrow-linewidth optical frequency comb (OFC) reference to a kilometer-long fiber delay line for the first time, to the best of our knowledge. The 1537-nm comb modes and 1566-nm comb modes in th…
View article: High contrast linking six lasers to a 1 GHz Yb:fiber laser frequency comb
High contrast linking six lasers to a 1 GHz Yb:fiber laser frequency comb Open
We demonstrate a 0.95 GHz repetition rate fully stabilized Yb:fiber frequency\ncomb without optical amplification. Benefitted from the high mode power and\nhigh coherence, this comb achieved 35 dB to 42 dB signal to noise ratio on the\ndir…
View article: Visible astro-comb filtered by a passively-stabilized Fabry-Perot cavity
Visible astro-comb filtered by a passively-stabilized Fabry-Perot cavity Open
We demonstrate a compact 29.3 GHz visible astro-comb covering the spectrum from 560nm to 700nm. A 837 MHz Yb:fiber laser frequency comb phase locked to a Rb clock served as the seed comb to ensure the frequency stability and high side mode…
View article: The NIM Sr Optical Lattice Clock
The NIM Sr Optical Lattice Clock Open
A 87Sr optical lattice clock is built at the National Institute of Metrology (NIM) of China. The atoms undergo two stages of laser cooling before being loaded into a horizontal optical lattice at the magic wavelength of 813 nm. After being…
View article: High-precision measurement of terahertz frequency using an unstabilized femtosecond laser
High-precision measurement of terahertz frequency using an unstabilized femtosecond laser Open
Frequency is one of the most important physical quantities of electromagnetic (EM) waves. With the development of terahertz (THz) technology, high-precision measurement of THz frequency is required in THz laser development, wireless commun…
View article: Absolute distance measurement by chirped pulse interferometry using a femtosecond pulse laser
Absolute distance measurement by chirped pulse interferometry using a femtosecond pulse laser Open
We propose here a method for absolute distance measurement by chirped pulse interferometry using frequency comb. The principle is introduced, and the distance can be measured via the shift of the widest fringe. The experimental results sho…
View article: Absolute distance measurement in a combined-dispersive interferometer using a femtosecond pulse laser
Absolute distance measurement in a combined-dispersive interferometer using a femtosecond pulse laser Open
In this paper, a ranging system using dispersive interferometry is developed with a femtosecond pulse laser, aiming to eliminate the measurement dead zones by using a greatly unbalanced Mach–Zehnder interferometer. The distance can be meas…
View article: Problems Caused by the Management of Multi-Campus University in China
Problems Caused by the Management of Multi-Campus University in China Open
In China, Multi-campus university has become a universal phenomenon in the process of development of higher education. The development of multi-campus university has achieved the transformation from elite education to popular education, ex…
View article: Hybrid fiber interferometer for simultaneous measurement of displacement and temperature
Hybrid fiber interferometer for simultaneous measurement of displacement and temperature Open
A hybrid fiber interferometer sensing configuration for displacement and temperature measurements is proposed and experimentally demonstrated that is constructed by splicing a short section of polarization maintaining optical fiber to an e…
View article: Er-fiber femtosecond optical frequency comb covering visible light
Er-fiber femtosecond optical frequency comb covering visible light Open
Femtosecond optical frequency combs (FOFCs) with output wavelengths covering visible light have potential applications in absolute frequency measureflent of iodine-stabilized lasers and optical clock lasers. Based on optical amplification,…