🧐🧐🧐How much do you know about the Gain Medium in semiconductor lasers?

As the name suggests, a gain medium is a material that provides optical amplification. When excited by external energy sources (such as electrical injection or optical pumping), it amplifies incident light through the mechanism of stimulated emission, leading to laser output.
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🧐🧐🧐How much do you know about the Duty Cycle in Semiconductor Lasers?

Although it’s just a ratio, the duty cycle directly affects the laser’s thermal management, lifespan, output power, and overall system design.
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A PN junction is the interface formed between a P-type semiconductor and an N-type semiconductor: P-type semiconductor is doped with acceptor impurities, such as boron (B), making holes the majority charge carriers. The N-type semiconductor is doped with donor impurities, such as phosphorus (P), making electrons the majority carriers.
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VCSEL Light Source and Its Structure - Inphenix

https://www.inphenix.com/en/vertical-cavity-surface-emitting-laser-vcsel/

#VCSELs have progressed from laboratory devices to industrial mass production devices in the last few years. The vertical-cavity surface-emitting laser is a type of semiconductor laser diode with laser beam emission perpendicular from the top surface, contrary to conventional edge-emitting #semiconductorlasers which emit from surfaces formed by cleaving the individual chip.