Results 281 to 290 of about 9,973,806 (349)
Some of the next articles are maybe not open access.
Submegahertz frequency-stabilized Nd:YAG oscillator
Optics Letters, 1982We have demonstrated a 5-msec, quasi-cw 10-Hz repetition-rate pulsed single-frequency Nd:YAG oscillator with a feedback-stabilized frequency bandwidth of less than 200 kHz.
Y L, Sun, R L, Byer
openaire +2 more sources
External dye-laser frequency stabilizer
Optics Letters, 1984We describe an external dye-laser frequency stabilizer that combines an acousto-optic frequency shifter with a fast electro-optic phase modulator. A compensating electronic delay line in the crossover network provides a near-ideal transducer response while keeping the voltage across the electro-optic crystal away from the amplifier limits.
J L, Hall, T W, Hänsch
openaire +2 more sources
NIM Frequency Stability Measurement System
1988 Conference on Precision Electromagnetic Measurements, 1988Advances in the frequency stability measurement at National Institute of Metrology (NIM) are presented. The performance of the automated measurement system is described. The measuring uncertainty is discussed in detail. It is pointed out that the noise floor is better than -176 dBc/Hz for the frequency-domain system, and is nearly sigma /sub y/( tau ...
null Rongcheng Li +4 more
openaire +1 more source
Frequency stability of a Zeeman-stabilized laser
Applied Optics, 1985The frequency of a commercial hard-sealed He–Ne laser has been stabilized to the center of the discharge gain profile using the mode splitting caused by an axial magnetic field. The absolute frequency has been measured repeatedly during intermittent operation over 20 months. Its drift over most of this period has been 2.6 ± 0.7 MHz/yr.
openaire +2 more sources
Multivariable Frequency Domain Stability Criteria
IFAC Proceedings Volumes, 1983Abstract In this paper we address the problem of determining the least conservative stability criteria for the stability of non-linear multivariable feedback systems based upon a characterisation of the non-linearity and eigenloci plots of the linear operator or its normal approximate.
C.J. Harris, R.K. Husband
openaire +1 more source
Optical-RF frequency stability transformer
Optics Letters, 2011An optical technique based on stability transfer among modes of a monolithic optical microresonator is proposed for long term frequency stabilization of a radio frequency (RF) oscillator. We show that locking the frequency difference of two microresonator modes with dissimilar sensitivity to an applied forcing function to a master RF oscillator ...
A B, Matsko +4 more
openaire +2 more sources
IEEE Transactions on Power Systems, 2019
With increase of practical power system complexity, power system online stability assessment and control is more and more important. Application of the traditional model-driven methods is always limited by contradiction between accuracy and efficiency ...
Qi Wang, Feng Li, Yi Tang, Yan Xu
semanticscholar +1 more source
With increase of practical power system complexity, power system online stability assessment and control is more and more important. Application of the traditional model-driven methods is always limited by contradiction between accuracy and efficiency ...
Qi Wang, Feng Li, Yi Tang, Yan Xu
semanticscholar +1 more source
Pulsed optically pumped atomic clock with a medium- to long-term frequency stability of 10-15.
Review of Scientific Instruments, 2020Herein, we report a significant improvement in the medium- to long-term frequency stability of our pulsed optically pumped (POP) vapor-cell rubidium clock. Such an achievement is established with the better control of our system and the environment.
Qian Shen +3 more
semanticscholar +1 more source
Frequency-stabilized 1 GHz turnkey frequency comb
Laser Congress 2019 (ASSL, LAC, LS&C), 2019We present the characterization and optical stabilization of a turnkey 1 GHz femtosecond laser at 1560 nm, opening new possibilities for metrology and dual-comb spectroscopy with improved SNR and faster acquisition rates.
Alexander J. Lind +6 more
openaire +1 more source
Center-Frequency-Stabilized Frequency-Modulation System
Proceedings of the IRE, 1947A system comparing the phase between two frequencies in a balanced phase detector utilizes the output to maintain synchronization between two oscillators. The phase detector operates between ±90 degrees. By dividing the frequency of a frequency-modulated oscillator, the frequency swing is reduced to less than ±24 degrees.
E.M. Ostlund, A.R. Vallarino, M. Silver
openaire +1 more source