14-Malik Little Semiconductor Lasers

14-Malik Little Semiconductor Lasers - Semiconductor Lasers...

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Semiconductor Lasers Malik Little ECE 3080
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Facts Semiconductor lasers: Cheap and smallest Lasers available • Easy fabrication • Mass produced • Gain medium is a p-n junction diode • Used for fiber optic communication Purdue universities Diode LASER
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Theory: Concept Requirements for lasing: • Diode must be forward biased. •Population inversion must occur •Electrons and holes both have to be in the junction NP 90% 100% Resonating Cavity L
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Theory: Math When calculating the population inversion and threshold values these are the key parameters: Γ a power_in_active_region Total_Power := Γ p power_in_p_region Total_Power := Γ n Power_in_n_region Total_Power := α eff α s Γ a α a n α n p α p + := β th α eff 1 2L ln 1 R1 R2 + := R n1 () + 2 := J th N th e
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14-Malik Little Semiconductor Lasers - Semiconductor Lasers...

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