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Figure 1 Peltier effect on the junction between dissimilar conductors Direction of heat flow
Material A Material B Material C
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Figure 2 The effect of electron jump in two level energies (a) electron flow from lower to high level requires absorbing heat (b) electron flow from higher to the lower level which cause releasing heat
(a) (b)
N Type N Type
P Type P Type
Electron flow
Electron absorbing flow
heat
releasing heat
Figure 3 The principle of thermoelectric module Heat Absorbed
Heat Released
Cold Side
Hot Side
P N P N
Laser Head
Laser Output
Nd: YAG KTP
Diode laser
Fan Extractor 532 nm
1064 nm 808 nm
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Figure 5 DL and KTP temperatures as a function of current Current (A)
Temperature (°C)
Threshold Current
Phase 1 Phase 2 Phase 3
DL profile KTP profile
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