Laser Speckle Reducer SK-11

When a coherent light source illuminates an object, speckle noise appears and degrades your important images. This phenomena occurs due to the coherence of the light and seems to be inevitable. SK-11 reduces speckle noise and improves your image quality. SK-11 consists of a fiber bundle of different length fibers. The input laser beam with high coherence emerges from SK-11 with lower coherence because the length of the each fiber is longer than the coherent length.

SK-11 is excellent for microscope illumination. Monochromatic illumination does not cause any chromatic aberration from the objective lens. SK-11 has no moving parts so that you will not suffer from the vibration noise. Scanning system is not required, making it suitable for the temporal resolved imaging.

SK-11 also works as a beam homogenizer. The input Gaussian intensity profile is transformed into a homogeneous profile.


With SK-11
Without SK-11

Optical images of an objective micrometer


Wavelength range450nm~950nm visible
(Custom:1000~1350nm, 250 nm~)
Input diameter3-7mm(more than 3mm)
Output diameter3-7mm(should be same as input diameter)
Optical polishing processing is done after banding both input and output
Transmittancemore than 50% (@550nm)
SizeH110mm x W140mm x D55mm
(fibar cable is not included)


How much speckle noise suppression is there?

The speckle noise suppression efficiency depends on the application. Since there is a demonstration machine available, we recommend that you actually check the effect.

How much is light transmission?

The standard product (corresponding wavelength range: 450 nm to 950 nm) is 50% or more at a wavelength of 532 nm.

How do you introduce laser light?

The collimated laser beam should be incident almost perpendicularly to the entrance. By entering collimated light, the spread of emitted light can be minimized. The adjustment of the optical axis on the input side is not very severe, and even if the incidence is slightly inclined, the function is hardly affected. In addition, there is no distinction between the incident side and the outgoing side in the SK-11.

How does the output light spread?

When collimated light is incident, it becomes diffused light of about 30 degrees on one side.

What is the diameter of the input and output pupils?

The standard product is 5 mm. It can be customized and has been manufactured with a minimum diameter of 2 mm and a maximum diameter of 10 mm, but as the diameter decreases, speckle noise suppression efficiency also decreases. Also, the price changes with customization.

How much is the damage threshold for laser?

The damage threshold of the standard product is 300 W / cm2. For high power laser compatible models, the damage threshold is 1200 W / cm2.

How resistant is the pulsed laser?

Although it has not been tested sufficiently, no damage was found even if it was used for a full day if it was about 10 mJ / cm2 · pulse (532 nm, 10 ns, 10 Hz).

What are the benefits of the optional flexible tube?

The entrance and exit can be placed apart. In addition, since the tip of the flexible tube is smaller than the main body, the flexibility of placement of the entrance or exit is increased. The length of the tube is 1m, but it can be customized.

Can I connect with a connector such as FC?

Although the incident side can be connected, it is more efficient to use a lens for coupling. The outgoing side can not be connected by FC.

Do you need a power supply?

No, Power supply is unnecessary.

 How long is the delivery time?

If you do not have stock, it is about 3 months after you place an order.

What are the advantages compared to rotating diffusers?

There are no moving parts and high reliability. There is no need for power. At 532 nm, the transmittance is 50%, and the light utilization efficiency is higher than that of a general diffuser. Since averaging is not performed temporally, speckle can be reduced even for a single pulse of a pulsed laser.

What happens if you use a standard product at an unsupported wavelength?

The corresponding wavelength range of standard products is 450 to 950 nm. When light of wavelengths shorter than 450 nm is incident, the transmittance gradually decreases, and the speckle removal rate also deteriorates. The more powerful the laser is, the faster it degrades. However, if the input is only a few mW or for a short time, it will hardly deteriorate. Please consult with us when considering such usage. Light in the range of 950-1400 nm has no effect on the lifetime. There is no guarantee of transmissivity, but speckle will decrease to some extent.

Is there a model that can be used at wavelengths other than 450-950 nm?

Although it becomes special order correspondence, the near infrared correspondence model of working wavelength range 1000-1350 nm and the ultraviolet correspondence model which can be used from 250 nm are also available.

What is the performance of special order products for UV or near infrared?

We are sorry, but there is no performance data that can be announced.