ALBEDO SYSTEM 
Laser Beam Homogenizer
 
ALBEDO SYSTEM is the technological breakthrough
which will help you to get the best results
for your applications

top hat beam PROFILE

 

infinity focus

 

speckle free

 

square shape

 

How it works?

The ALBEDO features the latest technical developments from ERROL in terms of beam including the output power, infinity focus, homogeneity and speckle reduction for your applications.

ALBEDO changes a beam profile into a uniform “flat-top”, by combining a multimode fiber input, with a laser speckle reducer and a square -core multimode output fiber.

In most applications, high quality image is required, and single mode fiber is used to couple the laser light. There are disadvantages to using a single mode fiber:

- sensitivity to light drift, making problem in coupling stability, it is due to the core size of the monomode fiber which is the same as the focus laser spot: 3.5 µm

-Power efficiency coupling is about 50%, inherent in the Gaussian intensity profile

-the spectral range is limited: 400-650nm

 

  • ALBEDO provides a multimode fiber input.

Multimode fiber advantages:

  • Long term stability of coupling

  • Coupling efficiency up to 80%

  • broadest spectrum of wavelengths 350 to 800 nm

  • No setting adjustments of coupling needed

The multimode fiber core size is 50µm, when the diameter of the focus laser spot is 3.5µm:

the sensitivity of coupling between the radiation source and fiber to mechanical is drastically reduced,

When the monomode fiber does not tolerate light drift,

ALBEDO has a drift tolerance of 25 µm, x7 the diameter of the laser spot, without any coupling loss.

 


ALBEDO combines a speckle reducer with a multimode square-core fiber out-put.

ALBEDO uses a rotating diffuser and a vibrating optical fiber to average the interference patterns and provides a uniform square-core shape illumination.

 

The rotative diffuser breaks the phase and the coherence of the beam to reduce speckle.

The bandwidth of randomizer is 300 kHz.

 

The square-core multimode fiber provides a uniform “flat-top” intensity profile.

The illumination uniformity is improved by vibrating the multimode fiber. The square-core multimode fiber provides more possibility for ray mixing during light propagation than a circular core multimode fiber.

 

Also, ALBEDO allows high speed imaging with an exposure time down to 1 ms.

 

Illustration of monomode and multimode core size

Projection of a 1951 USAF resolution test chart  with Albedo

A 1951 USAF resolution test chart is a microscopic optical resolution test device originally defined by the U.S. Air Force MIL-STD-150A standard of 1951. The design provides numerous small target shapes exhibiting a stepped assortment of precise spatial frequency specimens. It is widely used in optical engineering laboratory work to analyze and validate imaging systems such as microscopescameras and image scanners.

 
Laser injection in Square core mulimode fiber of Albedo
from Cladding to Core

ALBEDO does not include lasers. We sale separately a Laser Combiner, which can be plugged to the ALBEDO.

The ALBEDO is available in 3 versions, according to the level of despeckle required:

Low frequency 300Hz

Suitable Camera Frame Rate: up to 60Hz

Medium Frequency 300 kHz

Suitable Camera Frame Rate: up to 1 kHz

High Frequency up to 800 kHz

Suitable Camera Frame Rate: up to 10 kHz

ALBEDO Low frequency Box

MAPPING

64 rue Bourdignon, Bat 15A

94100 St-Maur-Des-Fossés

Email: errol.laser@gmail.com

Tel: +33 (0) 9.82.51.67.31

SIRET 320 867 682 000 41-Code APE: 331B

TVA Intracom FR 84 320 867 682

© 2019 Errol Laser