What is the role of the drive circuit, not directly connected to the appropriate power supply on the laser diode? How do you modulate the laser diode to send a sinusoidal signal?
What does the drive circuit do?
Protect the laser diode.
Are the appropriate power lights connected directly to the laser diode?
Yes, the laser diode on the laser pointer is directly connected to the battery.
How do you modulate the laser diode to send a sinusoidal signal?
Is difficult, because the laser diode have breakdown voltage problem, if you want to turn the laser signal into sine wave signal is best to use liquid crystal valve modulation, laser diode is only suitable for made into binary digital signal, is the only switch can't adjust brightness.