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First, I appreciate the feedback. Secondly, I understand that, even a little below the threshold current, the optical output is at extremely low power, and the device is no longer lasing - it acts like an LED, with a relatively broad optical output spectrum. The 120 mW is only referring to...

See if this makes sense… As mentioned above by Cyparagon, some diode lasers are capable of 210 MHz operation in a 20X DVD burner. If this is the -3dB bandwidth of the diode laser, then by standard theory, this frequency corresponds to a (1/e, or 63%) response time of 1/(2*pi*f), or 0.76 nsec...

Thanks for the reply. As I mentioned, I am interested in a basic physics experiment - measuring the speed of light. I could use an infrared diode laser or LED, but then it's more difficult to see where the beam is, focus it, etc. Since light travels very fast (about 1 foot per nanosecond or...

I would like to try using a red diode laser to create very fast laser pulses, with pulse widths of 1 to 5 nanoseconds or less, with pulses occurring at a low duty cycle, like 10 KHz. I need at least 200 mW of power during the pulses. I understand that the average power will be very low because...