Lasers: Power and wavelength dependence

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SUMMARY

The discussion centers on the use of a 1550nm diode laser driven by a triangular waveform from a function generator. Within the laser's bandwidth of under 10kHz, the output power replicates the input signal, resulting in a triangular waveform observed on the oscilloscope. Participants emphasize the need for power stabilization techniques to achieve a DC signal output. A key recommendation is to avoid using an AC waveform to drive the laser for desired DC output from the photodetector.

PREREQUISITES
  • Understanding of laser diode operation and characteristics
  • Familiarity with function generators and waveform types
  • Knowledge of photodetector functionality and signal interpretation
  • Basic principles of power stabilization techniques
NEXT STEPS
  • Research power stabilization techniques for laser diodes
  • Learn about photodetector signal processing methods
  • Explore alternative driving waveforms for laser diodes
  • Investigate the impact of bandwidth on laser output characteristics
USEFUL FOR

Laser engineers, optical system designers, and researchers working with diode lasers and photodetectors seeking to optimize signal output and stability.

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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