Tuning a Laser Diode | PhysLab

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Tuning a Laser Diode

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Student Manual

The output of a laser diode can be modulated by varying its temperature and current. In this experiment, we will develop an understanding of how a laser diode's optical power and the wavelength can be varied by controlling its temperature and operating current. Furthermore, we will use the proportional-integral (PI) feedback control system to stabilize and tune the temperature of the diode laser.

Essential pre-lab reading:
"Laser Diode (L785P100) Speci cations" by Thorlabs.
"Laser Diode Mount (TCLDM9) Manual" by Thorlabs (Understand the internal configuration of the mount).
"Laser Diode Driver Manual" by Thorlabs.

Software Code LabVIEW code
MATLAB script
Sample Results Wavelength as a Function of Temperature
Photodiode Current vs Temperature
Power vs Temperature
External photodiode current as a function of injection current
Internal photodiode current as a function of injection current
Hardware Manual L785P100 Specification Sheet
Laser Diode Mount Manual
Laser Diode Driver Manual
Experiment Code 3.6
Version Version 2019-1; July 23, 2019

Further Readings and References

  • Feedback control of Dynamic Systems
    Pearson, Frankline, Powell and E-Naeini, , Section 4.3, .

Pictorial Procedure


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  • Home
  • About Us
    • Overview
    • Centre for Experimental Physics Education (CEPE)
    • Physlab Team
    • Physlab Guidebook
    • Alumni
    • Open Positions
    • Muhammad Sabieh Anwar (Personal)
  • Academics
    • Lab Courses
    • Lab-I (PHY 100/200)
    • Lab-II (PHY 300/500)
    • AstroLAB
    • Ibn Sahl Corner for Optics
    • Fast Optics
    • Smart Physics
    • Single Photon Quantum Mechanics Lab
    • Chasing Cosmic Ray Muons at Physlab
    • Stories
    • Physics Studio
    • Research Stories
    • Class Activities
    • Courses Taught
    • Class Demonstrations
    • PhysDiary
    • Health and Safety
    • Lab Safety
    • Workplace Organization
  • Research
    • Research Themes
    • Research Internships
    • Research Stories
    • Physics WorldCup
      • International Young Physicists’ Tournament (IYPT) 2019
      • International Young Physicists’ Tournament (IYPT) 2018
      • International Young Physicists’ Tournament (IYPT) 2016
    • Hunerkada
    • Grants
    • Theses and Reports
    • Scientific Publications
    • Invited Talks (Selected)
  • Outreach
    • The Scientific Mind Through the Eyes of a Physics Experimenter
    • National Laboratory Immersion Program
      • First Lahore 2012
      • Second Sukkur 2013
      • Third Lahore 2014
      • Fourth Lahore 2016
    • Labview Workshop 2016
    • Open House
    • Khwarizmi Science Society
    • Helping Pakistan’s Universities
      • National University of Technology (NUTECH) 2019
      • Pakistan Institute of Engineering and Applied Sciences
        (PIEAS) 2019 (Final Phase)
      • Pakistan Institute of Engineering and Applied Sciences
        (PIEAS) 2019 (Phase 2)
      • Pakistan Institute of Engineering and Applied Sciences
        (PIEAS) 2018 (Phase 1)
      • National University of Science & Technology 2016
      • Habib University 2014
      • Preston University 2013
      • Ghulam Ishaque Khan Institute of
        Engineering Sciences and Technology 2011
      • Institute of Space Technology 2010
    • The National STEM School
      • STEM School (2018 – 2019)
      • STEM school (2016 – 2017)
    • Abdus Salam Memorial Lecture Series
  • Facilities
    • Laboratories
    • Equipments
    • Devices & Softwares
      • PhysPlot
      • Physlogger
      • Phystrack
    • Mechanical Workshop
    • Inventory
    • 3D Printed Galleria
    • Forms
    • Equipment Howto’s
  • Media
    • Videobytes
    • YouTube Channel
    • Visitors
    • Testimonials
  • Contact Us