light sources for optical coherence tomography · • optical coherence tomography has become a key...
TRANSCRIPT
Company Confidential
19-March-2014
Dr. Christian Vélez, Founder and CEO
Light Sources for Optical Coherence
Tomography
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Outline
• Products
• Markets
• Applications
• Optical Coherence Tomography
o Superluminescent LED (SLED) solutions
o Swept Source (fast tunable Laser) solutions
• Summary
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• HQ in Schlieren/Zürich • Employees: 30• Revenue: ~CHF 10m • Profitable• Shipped >200k devices
since 2003
Focused on engineering, sales and marketing of• Superluminescent Diodes (EXS)• Broadband Sources (EBS)• Wavelength-Swept Lasers (ESS)• SLED-based Transceivers (TxRx)• Balanced Receivers (EBR)
EXALOS
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SLEDs: a bridge between LDs and LEDsSLEDs: a bridge between LDs and LEDs
LEDLEDLEDLED
Inte
nsity
Wavelength
No cavity, No No cavity, No No cavity, No No cavity, No gaingaingaingainNo feedbackNo feedbackNo feedbackNo feedback
Spontaneous Emission(broadband, not directional)
Spontaneous Emission(broadband, not directional)
FP LDFP LDFP LDFP LD
Inte
nsity
Wavelength
Laser cavity, Laser cavity, Laser cavity, Laser cavity, gain, gain, gain, gain, feedbackfeedbackfeedbackfeedback
Stimulated Emission(narrowband, directional)
Stimulated Emission(narrowband, directional)
SLEDSLEDSLEDSLED
Inte
nsity
Wavelength
SingleSingleSingleSingle----passpasspasspassgain in waveguidegain in waveguidegain in waveguidegain in waveguide
ASE(broadband, directional)
ASE(broadband, directional)
What are Superluminescent Diodes ?
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> Speckle PerformanceSpeckle PerformanceSpeckle PerformanceSpeckle Performance
> LDLDLDLD > SLEDSLEDSLEDSLED
Blue LDs strong specklesBlue LDs strong specklesBlue LDs strong specklesBlue LDs strong speckles SLED light at 425nm with strongly SLED light at 425nm with strongly SLED light at 425nm with strongly SLED light at 425nm with strongly reduced speckle patternreduced speckle patternreduced speckle patternreduced speckle pattern
Speckle performace comparison SLED/LD
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EXALOS’ SLED modules
www.exalos.comwww.exalos.comwww.exalos.comwww.exalos.com
GaAs InP
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Fiber Optics Gyroscopes (FOG)Navigation system (air, space, sea, land)
Other applicationsMachine vision, metrology, etc.
Fiber Optics Sensors (FOS)Strain, pressure, current
Fiber Optic Test Equipment (FOT)Optical channel monitors
Optical Coherence Tomography (OCT)Medical Imaging
EXALOS Main Markets
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Optical Coherence Tomography Optical Coherence Tomography Optical Coherence Tomography Optical Coherence Tomography (OCT)(OCT)(OCT)(OCT)
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Time-Domain (TD-) OCT
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Penetration vs Resolution
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OCT for Ophthalmology• OCT imaging used for …
o Anterior lens surface and Anterior lens surface and Anterior lens surface and Anterior lens surface and anterior chamber/segmentanterior chamber/segmentanterior chamber/segmentanterior chamber/segment� refractive surgery on cornea� cataract & lens replacement
o Posterior lens surfacePosterior lens surfacePosterior lens surfacePosterior lens surface� lens replacement (IOL)
o RetinaRetinaRetinaRetina� AMD, diabetic retinopathy, etc.
Fovea = Point of central focus
Anterior chamberBlind spot
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OCT and Histology
• Goal of any imaging technology = visualization of structures that are found with histology !
• Fast spectral-domain OCT systems (and in combination with higher resolution of few microns) have demonstrated that OCT in ophthalmology is equally informative as histology but is nonnonnonnon----invasive, real time and ininvasive, real time and ininvasive, real time and ininvasive, real time and in----vivo vivo vivo vivo !
Fovea
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Medical OCT ImagingE. Swanson: “Photonics Markets: OCT – History and Current Status”, Feb 2013
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Non-Medical OCT ImagingE. Swanson: “Photonics Markets: OCT – History and Current Status”, Feb 2013
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400-2k A-scansper second
20k-70k A-scansper second
10k-200k (6000k) A-scansper second
OCT Evolution
SLED
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Spectral-Domain (SD-) OCT
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Swept Source (SS-) OCT
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Swept SourcesSwept SourcesSwept SourcesSwept Sourcesfor OCTfor OCTfor OCTfor OCT
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Swept Source Optical
Wavelength1250nm 1350nm
OpticalPower 0.05 nm (1/2000)
SLEDOpticalWavelength
1250nm 1350nm
OpticalPower 100 nm
A high-speed narrowband optical filter with wide tuning range is needed
SLED vs Swept Source
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butterfly package
Output coupler mirror
R-SOA
MEMS scanners
Gratings
λ(t)
P
Microlenses
EXALOS: ECL with MEMS Scanner
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Summary
• Optical Coherence Tomography has become a key technology for medical imaging
• A must for Ophthalmic and Cardio applications
• Light sources are a key enabler of today OCT systems
• Incumbent SLED technology is more and more been replaced by Swept Laser
• EXALOS has mange to position itself as a key player in this market
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Thank YouThank YouThank YouThank You
[email protected]@[email protected]@exalos.com