Anti-speckle technology

Speckle reduction without diffusers:

Dyoptyka has developed an innovative solution, using a phase-randomizing deformable mirror, for the reduction of speckle and other unwanted interference effects that can arise when using lasers and partially coherent sources of illumination such as superluminescent diodes.

It offers a unique combination of advantages over alternatives such as moving diffusers and shaking fibers with respect to: speckle reduction performance, speed, optical efficiency, electrical efficiency, size, and manufacturability.

Dyoptyka's miniaturized phase-randomizing deformable mirror:

New product: fully integrated module, uDM2

We are proud to announce our new miniaturized deformable mirror module with fully integrated control electronics.

Dimensions are: height 4.5 mm; width 6.0 mm; depth 2.0 mm (not including the mechanical mounting interface of which there are various possibilities.) The only electrical interface required is a DC voltage between 1.8 and 5.5 V, depending on the extent of angular divergence required. Power consumption depends on actuation the voltages and frequencies required by the application but 75 mW is typical. Reflectivity depends on coating but >98% is typical across visible wavelengths. Beam diameters from 0.5 mm to 3.0 mm can be accommodated. Optical power up to 10.0 W at 445 nm when the maximum mirror area is used. Some further technical details are provided here.

Of course we continue to supply our larger systems capable of handling >100 W of optical power.

Evaluation systems are now available. In consultation with our manufacturing partners we can provide price and lead time quotations for any volumes up to and exceeding thousands per month.

Recent publications

Directional Illumination with Homogenisation of Laser Incidence on Remote Phosphor

Laser Display and Lighting Conference, Jena, July 2016. Abstract

Optically Efficient Homogenisation of Laser Illumination

International Display Workshop, Otsu, December 2015. Abstract

Beam Quality-Preserving Speckle Reduction for Scanned Laser Displays

Laser Display Conference, Yokohama, April 2015. Presentation Abstract

Light guide plate illumination with blue laser and quantum dot emission

International Display Workshop, Niigata, December 2014. Abstract

A compact, low cost, phase randomizing device for laser illuminated displays

International Display Workshop, Niigata, December 2014. Abstract

Light guide plate illumination by laser through optical fiber

Laser Display Conference, Taichung, June 2014. Abstract

Speckle reduction for illumination with lasers and stationary, heat sinked, phosphors

International Display Workshop, Sapporo, 2013. Abstract

Speckle reduction with multiple laser pulses

Laser Display Conference, Yokohama, April 2013. Winner of best paper award! Presentation

Speckle reduction within a single one microsecond laser pulse

International Display Workshop, Kyoto, December 2012. Abstract

Speckle mitigation in laser-based projectors

Laser Display Conference, Yokohama, April 2012. Presentation

Speckle reduction for laser-illuminated picoprojectors

SPIE Photonics West, San Francisco, January 2012. Article

Frequently asked questions

What are the similarities and differences between Dyoptyka's deformable mirror solution and a moving diffuser?

Both approaches are used to generate sequences of uncorrelated speckle patterns which sum to a more homogeneous intensity over the exposure period. A moving diffuser must have a short correlation length so that it does not need to be moved at impractically high speed. The short correlation length leads to wide angle diffusion which can greatly reduce optical efficiency. The deformable mirror has a continuous surface which does not lead to wide angle diffusion. Its effect can be described as band-limited temporally-randomized divergence. Randomly-distributed deformations in the continuous surface at very high temporal frequencies lead to the generation of many uncorrelated speckle patterns, e.g. within a single one microsecond laser pulse.

What wavelengths, optical powers, and pulse lengths can be used?

Our systems are currently being used by customers with wavelengths ranging from 215 nm to 10.6 um (with reflection efficiency up to 99.9%, depending on coating,) with CW optical powers up to 100 W, and pulse lengths as short as 1 us.

In what types of optical system can the technology be used?

Our systems are currently being used by customers in projection, area illumination, microscope illumination, and interferometric optical systems. In both free-space and fibre-coupled configurations.

How can I evaluate the technology in my application?

We sell evaluation systems with optical system design consultancy support to help achieve optimal performance.

Dyoptyka evaluation system comprising a deformable mirror with application-specific size and coating, reconfigurable control electronics, and PC-hosted reconfiguration software.

Gallery

Effect of deformable mirror in illumination path of TI DLP picoprojector.

Effect of deformable mirror in the common path of a beam profile reflectometry interferometer.

Effect of deformable mirror with a single one microsecond laser pulse illuminating a grating.

Effect of deformable mirror in a Magneto-optical Kerr Microscope with 50 nanometre pixel size at object.

Effect of deformable mirror located before multimode fiber and collimating lens, illuminating materials with different textures.

Effect of deformable mirror located before round and square multimode fiber, imaged in the near field of fiber exit faces.

Applications

Projection display

We have been working in these application areas with customers for over five years. In the coming months, as NDAs and time permit, we plan to disclose here whatever useful information we can. In the meantime, please contact us directly for discussion.

Microscopy

We have been working in these application areas with customers for over five years. In the coming months, as NDAs and time permit, we plan to disclose here whatever useful information we can. In the meantime, please contact us directly for discussion.

Interferometry

We have been working in these application areas with customers for over five years. In the coming months, as NDAs and time permit, we plan to disclose here whatever useful information we can. In the meantime, please contact us directly for discussion.

Photolithography

We have been working in these application areas with customers for over five years. In the coming months, as NDAs and time permit, we plan to disclose here whatever useful information we can. In the meantime, please contact us directly for discussion.

Holography

We have been working in these application areas with customers for over five years. In the coming months, as NDAs and time permit, we plan to disclose here whatever useful information we can. In the meantime, please contact us directly for discussion.

Dimensional Metrology

We have been working in these application areas with customers for over five years. In the coming months, as NDAs and time permit, we plan to disclose here whatever useful information we can. In the meantime, please contact us directly for discussion.

Sensor Calibration

We have been working in these application areas with customers for over five years. In the coming months, as NDAs and time permit, we plan to disclose here whatever useful information we can. In the meantime, please contact us directly for discussion.

Target Illumination

We have been working in these application areas with customers for over five years. In the coming months, as NDAs and time permit, we plan to disclose here whatever useful information we can. In the meantime, please contact us directly for discussion.

General Illumination

We have been working in these application areas with customers for over five years. In the coming months, as NDAs and time permit, we plan to disclose here whatever useful information we can. In the meantime, please contact us directly for discussion.

And many more imaging applications ...

We have been working in these application areas with customers for over five years. In the coming months, as NDAs and time permit, we plan to disclose here whatever useful information we can. In the meantime, please contact us directly for discussion.

Contact

Please contact me directly with any queries

Email: fshevlin (at) dyoptyka (dot) com.

Fergal Shevlin Ph.D., Founder.

DYOPTYKA,
7 Westland Court,
South Cumberland St.
Dublin 2, Ireland.

Looking forward to hearing from you, Fergal.