VISIIIBLES RED

High-Performance SLEDs
for the RED Spectral Range

GaAs +

Next Generation of
Gallium Arsenide-based design

635 nm

Hitting the Sweet Spot of higher eye sensitivity and power consumption

+ 75% lm

75% higher Luminous Efficacy
than current 650 nm SLEDs

VISIIIBLES RED

High-Performance SLEDs
for the visible RED Spectral Range

GaAs

Next Generation of
Gallium Arsenide-based design

635 nm

Hitting the Sweet Spot of higher eye sensitivity and power consumtion

+ 75% lm

75% higher Luminous Efficacy
than current 650 nm SLEDs

With VISIIIBLESRED EXALOS provides a high perfomance SLED with low etendue and low speckle noise for the visible red spectral range. 

With a unique wavelength of 635 nm the next generation GaAs-based design hits the “Sweet Spot” of high luminous efficacy and low power consumption.

Perfect for illuminating micro-displays or head-up displays, for holography, metrology or spectroscopy.

EXALOS VISIIIBLESRGB SLED technology offers strong benefits, like high color gamut, high efficiency and effective collimation. Perfect for the next generation of projection technology, e. g. augmented reality displays.

Thanks to the low temporal coherence – a unique characteristic of SLEDs – VISIIIBLESRED are free of speckle, associated with laser-based projection displays. Moreover: based on the broad spectrum and high spatial coherence, EXALOS SLEDs offer high directionality (or low etendue) and high sharpness in image generation, outperforming existing LED- and laser-based projection systems.

VISIIIBLESRED are the key solution for small footprint AR/MR Micro Displays, direct Retina projection or holographic solutions, which will change the interaction between humans and information in the near future.

The device comes as TO-56 and 14-pin Butterfly packages. Special form factors and advanced solutions for next generation devices are available on request.

Features

  • Next Generation of GaAs-based design
  • Low speckle, broadband output
  • Enabling sharp images
  • High directionality, low etendue beam
  • Diffraction-limited (single spatial mode)
  • Polarized output
  • Energy efficient
  • High damage threshold
  • Perfect for compact size applications, free-space
    or fiber coupled architectures

VISIIIBLES RED are designed for: 

  • Holographic Displays
  • Near-to-eye Displays for AR/VR/MR, e.g. Smart Glasses
  • Color-sequential LCOS, DLP, SLM and Scanning MEMS Mirrors
  • Micro Displays
  • Military & Industrial HUDs
  • Pico Projectors
  • Machine Vision
  • Metrology
  • Microscopy

FEATURES

1 / 3

635 nm

Hitting the “Sweet Spot” of high luminous efficacy and low power consumption.

+ 75% lm

VISIIIBLES RED at 635 nm provide +75% luminous efficacy than the current generation of 650 nm SLEDs and Lasers.

C onsidering the photonic response of the eye, the luminous efficiency at 630 nm emission of a 10 mW light source is 2.5x higher than at 650 nm. Although it was highly desirable to introduce red SLEDs with a wavelength in the red spectral range below 640 nm, to take this clear advantage no real SLED market-ready solution was available – so far.

Despite an intensive research effort for at least two decades, red LDs with emission < 640 nm have only achieved product maturity in recent years. EXALOS was among the few manufacturers, who was able to deliver market-ready high-performance red SLEDs with 650 nm emission in recent years. EXALOS is now delivering the next – huge – step to even smaller wavelengths in the red visible range.

Red SLEDs at 650 nm

Made by EXALOS

After more than 15 years of experience of producing industry-leading GaAs-based light sources, EXALOS has successfully managed to deliver high-performance SLEDs with 650 nm spectral emission to the global market. The power-efficient devices have been commercially available for the past years (see www.exalos.com).

The SLED line provides the following essential features:

  • Free-space (TO56) or SM fiber output (14-BTF)
  • 10-20 mW optical powers
  • 5 to 10 nm spectral bandwidth

Download Specifications files.

EXALOS 650 nm SLEDs are available as
TO-56 (6 or 10 nm Bandwidth) and 14-BTF modules.

(EXS210030-03, EXS210035-02, EXS210033-03)

From our Blog

The best compromise – efficacy vs. output power: 635 nm

Highly Efficient RED Superluminescent Light-Emitting Diodes at 625-650 nm.
Based on full 3D simulations of the electro-optical performance, EXALOS has proposed and verified different ways for shifting the emission wavelength down below 640 nm.

Read More

FEATURES

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The Next Generation of
Gallium Arsenide-based SLED design.

With more than a decade of experience and the leading EXALOS research team, we were able to design the new SLEDs for the high-efficient lower red spectral region, based on our proven 650 nm architecture.

Thanks to a new active region composition and an advanced edge emitting design the optimum wavelength with the highest luminous flux values around 635 nm was achieved.

The EXALOS GaAs/GaN material system

The highly efficient SLEDs for the red spectral region, Made by EXALOS, are based on AlGaInP alloys.

Light emission at 630-650 nm is achieved by sandwiching strained multi-quantum wells (MQWs) in between Al(Ga)InP cladding layers. EXALOS provides SLEDs operating at 650 nm for the past few years (see above).

+

Learn more about the EXALOS material system

Challenges for Low Spectrum RED SLEDs

T he high interest in the application of LDs and SLEDs in vision systems or displays has resulted in a push to bring the emission wavelength below 640 nm, where the luminous efficacy of the human eye is much higher.

See our blog: The best wavelength for RED SLEDs

However, the shorter wavelength does not come for free and intrinsic problems related to the light emission efficiency of the AlGaInP material system arise.

The problem depends mainly on the small conduction-band offset between the active layers and cladding layers.

Moving to shorter wavelengths makes the quantum wells shallower:

+

READ MORE

The advanced EXALOS GaAs-based design is a milestone for high-performance red SLEDs in the visible spectral range.

By overcoming the intrinsic challenges of the current materials, VISIIIBLESRED provide the best combination of increasing luminous efficacy and decreasing the internal efficiency of the light emitting active regions in a market-leading product.

FEATURES

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Superior Image Quality

Low Speckle. High Sharpness. Efficient Beam Collimation.

Modern holographic displays can reconstruct 3D images with full wavefront information and in high quality, free from discontinuous motion parallax, crosstalk and lack of accommodation depth cue.

The key factor for image quality is the used light source. A high degree of coherence is required to realize artifact free, sharp presentation. 1

Consequently, a light source with high spatial coherence and low temporal coherence is ideal for a holographic display in order to obtain high quality images with good sharpness and minimum speckle. sLEDs … are suitable light sources for this purpose. 1

Due to their operational principles, SLEDs combine the best characteristics of lasers and LEDs and therefore promise important benefits for illuminating MEMS-mirror scanning architectures, LCOS-based displays and holographic spatial modulator.

The high spatial coherence typical of SLED emission – which corresponds to a directional light beam output – leads to a reduced complexity of collimation optics required in the optical subsystems. The low temporal coherence – resulting from the large spectral bandwidth – obviates the need for bulky dephasers used to reduce undesirable speckle noise.

Furthermore, the light output can be conveniently collimated into parallel beams or focused to µm-scale spot sizes and shows high degree of linear polarization, which can in turn lead to 50% savings in optical output power when used for illumination of LCOS-based micro-displays.2
SLEDs: The optimal hybrid light source

Benefits for modern display applications, compared to LEDs and Lasers:

LED SLED LD
Optical Spectrum Broadband Broadband Narrowband
Temporal Coherence Low Low High
Speckle Noise Generation Low Low High
Directionality Low High High
Polarization High High Low
Spatial Coherence Low High High
Coupling into Single-Mode Fibers Poor Efficient Efficient
Polarization State Random Linear Linear

1 Coherence properties of different light sources and their effect on the image sharpness and speckle of holographic displays (2017).

Yuanbo Deng & Daping Chu. Scientific Reports Volume 7, Article number: 5893 (2017) / DOI:10.1038/s41598-017-06215-x
Published with Open Access under Creative Commons Attribution 4.0 International License
External Link: www.nature.com – Scientific Reports

2 RGB Superluminescent Diodes for AR Micro-Displays

Marco Rossetti, Antonino Castiglia, Marco Malinverni, Christian Mounir, Nicolai Matuschek, Marcus Duelk, Christian Vélez
SID 2018 Digest.

From our Blog

Quality Comparison of potential light sources
for Holographic Projection

The test from Yuanbo Deng & Daping Chu, published in Scientific Reports 7: 5893, compares the Coherence properties of 5 light sources and their effect on the image sharpness and speckle of holographic displays.

Read More

SPECIFICATIONS *

VISIIIBLES RED 635 nm

Maximum Ratings *

Product number EXS210105-02

Package TO-56

Max. Output Power ( P )

15 mw

typ. 3dB Bandwidth ( λ )

6 nm

Max. Forward Current ( IF )

70 mA

Max. Forward Voltage ( VF )

3 V

* Preliminary Specification: This product is under development.

The data sheet contains preliminary data. Additional data may be added at a later date. EXALOS reserves the right to change specifications at any time without notice in order to supply the best possible product.

Operating characteristics (TO-56 module) *

Tcase: 25 °C; P: 10 mW

Centre wavelength ( λ )

625 nm

Min

635 nm

Typ

645 nm

Max

3dB bandwidth ( Δλ )

5 nm

Min

6 nm

Typ

Forward voltage ( VF )

2.3 nm

Typ

2.5 nm

Max

Forward current ( IF )

55 mA

Typ

65 mA

Max

Preliminary Specification: This product is under development. The data sheet contains preliminary data. Additional data may be added at a later date. EXALOS reserves the right to change specifications at any time without notice in order to supply the best possible product.

VISIIIBLES RED 635 nm

14-pin Butterfly module

EXALOS offers the next-generation SLED with 635 nm also as 14-pin module with SM Fibre connector (3.3 / 125 µm Nufern S405-XP). The module provides a typical electro-optical performance (TSLED= 25 °C) of 3 mW with a bandwidth of 6 nm.

Product number EXS210098-01

Package 14-BFL

VISIIIBLES RED 635 nm

14-pin Butterfly module

EXALOS offers the next-generation SLED with 635 nm also as 14-pin module with SM Fibre connector (3.3 / 125 µm Nufern S405-XP). The module provides a typical electro-optical performance (TSLED= 25 °C) of 3 mW with a bandwidth of 6 nm.

Product number EXS210098-01

Package 14-BFL

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HIGH-PERFORMANCE LIGHT SOURCES

MADE IN SWITZERLAND

HIGH-PERFORMANCE LIGHT SOURCES

MADE IN SWITZERLAND

EXALOS AG is a privately held Swiss technology company, developing industry-leading Superluminescent Light Emitting Diodes and Swept Laser Sources for the medical imaging, fiber optic gyroscope, test equipment, space, military and sensor industries.

EXALOS offers the widest range of visible SLEDs, including the world’s only true BLUE & GREEN SLEDs, SLED-based Transceivers for Fiber Optic Gyroscope and Current Sensing applications.

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