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.

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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.

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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.

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