Optotune’s LSR series of transmissive laser speckle reducers allows significant speckle reduction in laser systems. Local interferences are removed by dynamically diffusing the coherent beam. Optotune’s LSRs are essentially moving diffusers with a unique method of actuation. Two innovative technologies are offered, each with its own advantages.
Electro-active polymer Laser Speckle Reducers
Optotune was the first to commercialize electro-active polymers (EAPs) in the field of optics. The basis of this approach is a thin, elastic membrane that carries a lightweight diffuser in its center and four electrodes surrounding it. Actuated at a 90° phase shift, the electrodes induce a circular oscillation of the diffuser in x- and y-direction. The ultra-compact form factor, minimal weight and the absence of noise and vibrations make this technology particularly attractive for hand-held devices.
Reluctance force Laser Speckle Reducers
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.
Optotune’s laser speckle reducer is the ideal choice for application in laser projection displays, beam homogenizers, metrology, microscopy, interferometry and lithography.
Optotune’s laser speckle reducers can be tailored to your specific demands in terms of size, oscillation frequency or transmission range – contact Pacer for details.
LSR-4C Reluctance Force LSR
Optotune’s LSR-4C-L speckle reducer has an aperture of 18.5×18.5 mm and is especially suitable for applications where high laser powers and large beam diameters are used. The diffusor is mounted in a thin steel frame. As part of a larger metallic structure the frame is set into motion by the reluctance force, generated by the oscillating magnetic field of a driving coil. If required, the LSR-4C can combine two oscillating diffusors rotated by 90°, realizing optimized despeckling in both directions. The compact driving electronics, assembled on a flexible plastic substrate, stabilizes the resonance frequency in closed-loop mode and includes an error signal.