ENEE 486 -Optoelectronics Laboratory -Fall 2000
Instructor: Dr. Julius Goldhar
Teaching Assistant: Ms. Sukanya Tachatraiphop
Lecture: Mondays 1-1:50, Jasmine Computer Classroom
Lab: Mondays 2-5 PM; Rm 1170, Eng Lab Bldg.
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Study Note - Optoelectronics Lab | ENEE 486, Study notes of Electrical and Electronics Engineering
Material Type: Notes; Professor: Goldhar; Class: Optoelectronics Lab; Subject: Electrical & Computer Engineering; University: University of Maryland; Term: Fall 2000;
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ENEE 486 - Optoelectronics Laboratory - Fall 2000
Instructor: Dr. Julius Goldhar
Teaching Assistant: Ms. Sukanya Tachatraiphop
Lecture: Mondays 1-1:50, Jasmine Computer Classroom
Lab: Mondays 2-5 PM; Rm 1170, Eng Lab Bldg.
Website
http://www.ece.umd.edu/courses/enee486.F2000/
Course Information
Instructor Infomation
Calendar
Laboratory instructions
Lecture slides (preliminary)
Guidelines for writing reports
Grading
The grade will be based on the laboratory reports
and two quizzes.
The quizzes determine 50% of the grade.
For details look at the web:
Guidelines for writing reports for ENEE 486
Calendar of events- tentative
First lecture: Monday September 11, 1:00-1:50 PM.
Lab tour and demos: Monday September 11, 2 –2:45 PM.
Labs 1,2,3,4 - September 18th, September 25th, October 2nd,
October 9th
Labs 5,6,7 - October 16th, October 23rd, October 30th, November 6th,
Quiz #1 - October 16th
Labs 8,9,10 - November 13th, November 20th, November 27th,
December 4th Quiz #2 - December 11th
Schedule of rotation for different groups between the labs will be posted
ENEE 486 – Applications of Optics
- Image Formation: Simple and compound lenses, telescope, microscope
- Gratings & spectrometers: The grating formula, blaze angle
- E/O and A/O modulators: Natural and induced birefringence, Pockels’ cell, diffraction of light by sound
- N 2 pumped dye laser: Spontaneous emission, gain, feedback, tunability
- Fiber optics: Numerical aperture, transverse modes, bandwidth, optical communication
- Fourier Optics: Diffraction, 2-D fourier transforms, filtering, pattern recognition
Lab# 1. Detectors of light
Measuring optical power,
Neutral density filters,
Optical density,
Photocell, Quantum efficiency,
Resolution in time, PIN diode
Resolution in space, CCD array
Neutral density filters are used to vary light power
laser beam
MilliWats
ND filter
Transmission = 10 −OD
OD = Optical density
OD T 0 100% 0.3 50% 1 10% 2 1%
Photocell generates current from light
laser beam
0.1000 mA
Multi- meter Current
electrical signal
Photocell
Photons generate electron-hole pairs in a photocell
Current = 2e Ne
Photocell
e = 1.6 10-19^ Coulombs Ne= #of electrons /second factor of 2 is due to e-h pairs
laser beam
Power = hν Np
h = 6.6× 10 -34^ Joule-sec
ν = c / λ λ = c/ν =632.8 nm
Np= #of photons /second
Quantum efficiency = Ne /Np
Electrical power output from the photocell depends
on the load resistance
Photocell
laser beam RL
V
Electrical Power = I V = I^2 RL = V^2 /RL
Photocell acts as a non-ideal current ( or voltage) source. Optimal electrical power dissipation in the load occurs when RL is equal to the source impedance (which depends on optical power)
I
Chopper provides temporal modulation of
optical beam
oscilloscope
PIN
diode RL C
Load resistance and parasitic capacitance
determine the signal’s rise and fall times
time
Voltage
PIN
diode RL^ C = Cdiode+Ccable+Cscope
tF tR
tR = tF ~ 2RC
Ccable~ 30 pf/foot
Lab#2. Refraction of light
Snell’s law,
Prisms,
Index of refraction,
Angle of minimum deviation
Critical angle,
Total internal reflectionn
Snell’s law describes refraction of light
- n 1 sin θ 1 == n 2 sin θ - n 1 n - θ
- θ