scholarly journals Generation of sub-MHz and spectrally-bright biphotons from hot atomic vapors with a phase mismatch-free scheme

2021 ◽  
Vol 29 (3) ◽  
pp. 4632
Author(s):  
Chia-Yu Hsu ◽  
Yu-Sheng Wang ◽  
Jia-Mou Chen ◽  
Fu-Chen Huang ◽  
Yi-Ting Ke ◽  
...  
Keyword(s):  
Phase Mismatch ◽  
Atomic Vapors

scholarly journals Velocity-selective direct frequency-comb spectroscopy of atomic vapors

2012 ◽  
Vol 86 (3) ◽  
Author(s):  
J. E. Stalnaker ◽  
S. L. Chen ◽  
M. E. Rowan ◽  
K. Nguyen ◽  
T. Pradhananga ◽  
...  
Keyword(s):  
Frequency Comb ◽  
Atomic Vapors

Soliton emission at a phase-mismatch boundary in a quadratic nonlinear film waveguide

2003 ◽  
Vol 28 (23) ◽  
pp. 2348 ◽  
Author(s):  
Fabio Baronio ◽  
Costantino De Angelis ◽  
Paul-Henri Pioger ◽  
Vincent Couderc ◽  
Alain Barthélémy ◽  
...  
Keyword(s):  
Phase Mismatch

scholarly journals Low-frequency unsteadiness in the wake of a normal flat plate

1998 ◽  
Vol 370 ◽  
pp. 101-147 ◽  
Author(s):  
F. M. NAJJAR ◽  
S. BALACHANDAR
Keyword(s):  
Shear Layer ◽  
Flat Plate ◽  
Free Stream ◽  
Low Frequency ◽  
Separated Flow ◽  
Phase Mismatch ◽  
Streamwise Vortices ◽  
Long Time ◽  
Drag And Lift ◽  
High Degree

The separated flow past a zero-thickness flat plate held normal to a free stream at Re=250 has been investigated through numerical experiments. The long-time signatures of the drag and lift coefficients clearly capture a low-frequency unsteadiness with a period of approximately 10 times the primary shedding period. The amplitude and frequency of drag and lift variations during the shedding process are strongly modulated by the low frequency. A physical interpretation of the low-frequency behaviour is that the flow gradually varies between two different regimes: a regime H of high mean drag and a regime L of low mean drag. It is observed that in regime H the shear layer rolls up closer to the plate to form coherent spanwise vortices, while in regime L the shear layer extends farther downstream and the rolled-up Kármán vortices are less coherent. In the high-drag regime three-dimensionality is characterized by coherent Kármán vortices and reasonably well-organized streamwise vortices connecting the Kármán vortices. With a non-dimensional spanwise wavelength of about 1.2, the three-dimensionality in this regime is reminiscent of mode-B three-dimensionality. It is observed that the high degree of spanwise coherence that exists in regime H breaks down in regime L. Based on detailed numerical flow visualization we conjecture that the formation of streamwise and spanwise vortices is not in perfect synchronization and that the low-frequency unsteadiness is the result of this imbalance (or phase mismatch).

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