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Viewing report
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Laser Spark Plug Development and Engine Testing. Edition No. 1
VDM Publishing House, Dec 2008, Pages: 224
To meet the ignition system needs of future lean-
burn natural gas engines a diode side pumped,
passively Q-switched, Nd:YAG laser was developed and
tested. Laboratory experimentation used a wide range
of input parameters that when combined produced
brilliant sparks in air. The results show a strong
dependence of the output on the output coupler
reflectivity, Q-switch initial transmission, and
gain media dopant concentration. The results show
peak power levels of up to 3MW and peak focal
intensities of up to 560 GW/cm2. Engine testing was
performed on a Ricardo Proteus single cylinder
research engine. The engine testing consisted of a
comparison of the in-cylinder, and
emissions behavior. All engine parameters were kept
as constant and the equivalence ratio was varied
between 0.8, 0.9, and 1.0. The test laser was
constructed with a 30% output coupler, 32% Q-switch
initial transmission, and a 0.5% Nd concentration
rod all pumped by approximately 1000 Watts of
optical power. The test laser single mode
output pulse had an energy of 23 mJ, with a
pulsewidth of 10 ns, and an M2 value of 6.55. This
output produced focal intensity of 270 GW/cm2.
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