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Optimizing the Throughput of
an Optical System
Lisa Phillips
Textron Systems
Mentor: Robert Nolan
Advisor: Robert Lercari
R&D Team: Tim Georges, Curtis Krupp
Chris Matsuura, Donna Rohrer, Clint Smith
Home Institution: Maui Community College
Outline
The Air Force and Textron Systems
 The Laser Beam Director (LBD)
Transmitting Telescope
 The Beam Relay Optics System
 The Focus of My Project




Component Limitations
Measuring Light Throughput Efficiency
Results and Analysis
The Air Force and Textron

The Air Force
Active imaging ladar systems
 Mission of tracking and identifying dim space
objects


Textron Systems

Developed technology to support this
mission
The Maui Space Surveillance
Site
Laser
Beam
LBD
0.6m
Laser
Return
AEOS
3.6m
The Laser Beam Director (LBD)
Transmitting Telescope
 Laser
 LBD
telescope
 Beam relay optics
Laser
LBD Coude Path
Beam Relay
Optics
The Beam Relay Optics System
• Two Jobs
•
•
Direct the laser beam
Modify the laser beam
• Includes
•
•
•
Mirrors
Beam expanders
Cube beam splitter
The Focus of My Project
• Maximize the light throughput of the beam
relay optics system
• To increase the amount of light illuminating
the object of interest
Light Throughput Loss
• Light loss occurs whenever light is
• Absorbed
• Reflected
• Transmitted
• Every component of the system
contributes to light throughput loss
Mirrors
• Use
• to change the direction of the laser beam
• Limitations of Real Mirrors
• Part is reflected (specular reflection)
• Part is absorbed
• Part is scattered (diffuse reflection)
http://www.play-hookey.com
Beam Expander
• Use
• Increase the diameter
• Decrease the divergence
• Limitations
• Mirrors
• Structure
http://www.arachnoid.com
Cube Beam Splitter
• Use
• Splits a beam into two beams
• Limitations
• Part is transmitted
• Part is reflected
• Part is absorbed
http://rp-photonics.com
Measuring Light Throughput
Efficiency
• Use a power meter
• To measure Power In and Power Out
• Light throughput efficiency
• (Power out/Power in)*100%
• High efficiency
Cube Beam Splitter
• Problem
• Estimated reflecting 30%
• Test Results
Time (s)
Power In
(mW)
Power Out
(mW)
0
127
104
10
128
104
20
128
103
30
128
103
40
128
103
50
128
103
60
128
104
average
128
103
Analysis of the Cube Beam
Splitter
• Light throughput efficiency
• (103mW/128mW)*100% = 80%
Pellicle Beam Splitter
• Benefits
• Thin membrane
• Limitations
• Thin membrane
• Test results
http://www.cvilaser.com
Time (s)
Power In
(mW)
Power Out
(mW)
0
127
120
10
128
120
20
128
120
30
128
120
40
128
119
50
128
118
60
128
120
average
128
120
Analysis of the Pellicle Beam
Splitter
• Light throughput efficiency
• (120mW/128mW)*100% = 94%
Pellicle vs. Cube
• Improvement of the light throughput
efficiency
• 94% - 80% = 14%
Conclusion
• Pellicle
• Optical System Analysis
• Beam Expanders
• Mirrors
Acknowledgments
•Textron
•Don Ruffatto
•Robert Nolan
•Robert Lercari
•Timothy Georges
•Curtis Krupp
•Chris Matsuura
•Donna Rohrer
•Clint Smith
•David Schultz
•Charles Thurber
•Lianne Combo
•Caroline Fuji
•Arlen Hall
•Kelly Kobayashi
•Captain Wright (USAF)
•Maui Community College
•Mark Hoffman
•Center for Adaptive Optics &
Akamai Workforce Initiative
•Lisa Hunter
•Lani Lebron
•Nina Arnberg
•Mike Nassir
•Short Course Instructors
•Dave Harrington
•Mike Foley
•Mark Pitts
The 2009 Maui Akamai Internship Program is funded by the University of Hawaii, the
Department of Business, Economic Development, and Tourism, the National Science
Foundation Center for Adaptive Optics (NSF #AST - 9876783).
.