Lasers: Power and wavelength dependence

AI Thread Summary
The discussion centers on the challenges of using a 1550nm diode laser driven by a triangular waveform from a function generator, resulting in an output that mirrors the input signal within the laser's bandwidth. The user seeks power stabilization techniques to achieve a DC signal on their oscilloscope instead of the current AC output. Participants question the feasibility of expecting a DC output when the laser is driven by an AC waveform, suggesting that the driving method may need to be reconsidered. The conversation emphasizes the importance of understanding the relationship between the input signal and the expected output. Ultimately, achieving a stable DC output may require a different approach to driving the laser.
MelioraGator
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I have a 1550nm diode laser. I have a function generator sending a triangular function into the fast input of the laser; however, if I am within the bandwidth of the laser (under 10kHz), my output power of the laser mimics my fast input signal, so I get a triangular function on my O-scope with the same Vpp (typically 2V) and frequency. I wanted to know if there are any power stabilization techniques which will give me a DC signal on my O-scope.
 
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MelioraGator said:
I have a 1550nm diode laser. I have a function generator sending a triangular function into the fast input of the laser; however, if I am within the bandwidth of the laser (under 10kHz), my output power of the laser mimics my fast input signal, so I get a triangular function on my O-scope with the same Vpp (typically 2V) and frequency. I wanted to know if there are any power stabilization techniques which will give me a DC signal on my O-scope.

You are driving the laser diode with an ac drive waveform, and expect a dc output from your photodetector? What am I missing?
 
Don't use an AC waveform to drive the laser?
 
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