Narrow gain spikes and frequency pulling in the midinfrared ammonia laser

1991 ◽  
Vol 27 (5) ◽  
pp. 1199-1206 ◽  
Author(s):  
K.J. Siemsen ◽  
A.A. Madej ◽  
J. Reid
Keyword(s):  
Frequency Pulling ◽  
Ammonia Laser

Frequency pulling in optoelectronic oscillator by RF signal injection

2020 ◽  
Vol 52 (4) ◽  
Author(s):  
Jayjeet Sarkar ◽  
Larissa Aguiar Dantas de Britto ◽  
Abhijit Banerjee ◽  
Nikhil Ranjan Das ◽  
Gefeson Mendes Pacheco
Keyword(s):  
Optoelectronic Oscillator ◽  
Frequency Pulling ◽  
Signal Injection ◽  
Rf Signal

Frequency pulling in a Brillouin fiber ring laser

1994 ◽  
Vol 6 (7) ◽  
pp. 801-803 ◽  
Author(s):  
P.-A. Nicati ◽  
K. Toyama ◽  
S. Huang ◽  
H.J. Shaw
Keyword(s):  
Ring Laser ◽  
Fiber Ring Laser ◽  
Fiber Ring ◽  
Frequency Pulling

Multiwatt optically pumped ammonia laser operation in the 12–13 μm

1978 ◽  
Vol 17 (3) ◽  
pp. 317-320 ◽  
Author(s):  
V. Yu. Baranov ◽  
S. A. Kazakov ◽  
V. D. Pis'menny ◽  
A. I. Starodubtsev ◽  
E. P. Velikhov ◽  
...  
Keyword(s):  
Laser Operation ◽  
Optically Pumped ◽  
Ammonia Laser

Synchronization During Multi-Mode Thermoacoustic Oscillations in a Liquid-Fueled Gas Turbine Combustor at Elevated Pressure

2019 ◽  
Author(s):  
Mitchell L. Passarelli ◽  
J. D. Maxim Cirtwill ◽  
Timothy Wabel ◽  
Adam M. Steinberg ◽  
A. J. Wickersham
Keyword(s):  
Heat Release ◽  
Gas Turbine ◽  
Heat Release Rate ◽  
Release Rate ◽  
High Speed ◽  
Elevated Pressure ◽  
Fuel Injector ◽  
Frequency Pulling ◽  
Industrial Gas Turbine ◽  
Thermoacoustic Oscillations

Abstract This paper analyzes intermittent self-excited thermoacoustic oscillations in which the pressure (P′) and heat release rate (q̇′) fluctuations are harmonically coupled. That is to say, P′ and q̇′ do not oscillate at the same frequencies, but rather at frequencies in integer ratios. Thus, this system represents a case dominated by nonlinear cross-mode coupling. The measurements were obtained in an optically-accessible combustor equipped with an industrial gas turbine fuel injector operating with liquid fuel under partially-premixed conditions at elevated pressure. High-speed chemiluminescence (CL) imaging of OH* was used as an indicator of the heat release rate. The data was processed using spectral proper orthogonal decomposition (SPOD) to isolate the dominant heat release and pressure modes. Synchronization theory was used to determine when the modes are coupled and how their interaction manifests in the measurements, particularly how it relates to the observed intermittency. The results show three distinct intervals of synchronized oscillation shared by all the mode pairs analyzed. The first interval exhibits the same characteristics as a pair of noisy, phase-locked self-oscillators, with phase-slipping and frequency-pulling. While the behaviour of the second interval differs among mode pairs, strong frequency-pulling is observed during the third interval for all pairs.

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