Laser speckle reducers (LSR) & beam homogenizers

Optotune's laser speckle reducers are nothing other than moving diffusers. But the way they are actuated is absolutely unique.

Applications:

  • Laser speckle reduction

  • Beam homogenization

Reluctance force LSR

Launched in 2016, the reluctance force LSR is particularly suitable for applications that require large format glass diffusers. The basis of this approach is a single thin steel structure that is brought into resonance by pulsing an actuating coil with current, which generates a strong reluctance force. Thanks to a high q-factor large amplitudes in the range of 800um are achieved at low power consumption even for heavy glass diffusers.

Advantages:

  • Compact design with integrated actuator

  • Works with different diffusor materials

  • Driving electronics integrated on flex-cable

  • Robust design for harsh environments

  • Long operational lifetime

Reluctance force LSR

Reluctance force LSR

 
 

Large 2D LSR for automotive HUD

Optotune can customize LSRs based on its new voice-coil actuation platform that supports large clear apertures and large circular amplitudes in 2D. The devices can be driven with power-efficient PWM drivers. If needed, closed-loop control can be added. Such devices are suitable for de-speckling in head up displays (HUDs) when placed in the intermediate image plane. Please contact Optotune if you are interested to learn more about our development kit and a customization project.

 
The following table summarizes the main specifications of Reluctance force LSR's:

Specification Reluctance force LSR
Clear aperture 18.5x18.5mm
Diffuser Glass or polycarbonate
Transmission Up to 98%
Oscillation type 1D (linear)
Oscillation amplitude 800um
Resonant frequency ~120Hz (depends on diffuser weight)
Weight 11g
Vibrations Low (depends on mechanical mount)
Cover glasses None
Electronics 5 VDC (coils are pulsed with current)
Operational lifetime >40'000 hours

Products: laser speckle reducers

 

Related content: applications

LSR-4C-L