990-0075 series laser power attenuator is a compact motorized device for laser power control of linearly polarized beam. Its operation principle consists of changing laser beam polarization by rotation of zero-order half-waveplate and then passing the beam through a fixed Brewster type thin film polarizer which transmits p-polarized and reflects s-polarized laser beam. The intensity ratio of s- and p- polarized beams can be continuously varied without alteration of other beam parameters by motorized rotation of the waveplate. The attenuation level is controlled by the software in 0.1 - 97% range.

The device combines unique mechanical design which ensures repeatability and high stability of performance. All optical components of the attenuator have high LIDT coatings (>10 J/cm² at 10 ns, 1064 nm) and provide stable and reliable performance even using device with high power lasers in industrial applications.

Standard compact motorized attenuators are designed for operation at the most common laser wavelengths: 1064 nm, 1020-1040 nm, 780-820 nm, 532 nm, 510-520 nm, 390-410 nm, 355 nm and 343 nm. Custom attenuators can be designed for other laser wavelengths. 

A secondary laser beam with s-polarization can be rejected from the laser power attenuator unit to an external beam dump or utilized for the particular application. A standard compact external beam dump is optionally offered with this attenuator and is suitable for lasers with average power up to 6 W. This beam dump stops secondary s-polarized beam in the attenuator and allows to avoid any thermal effects or stress in the housing of the device.

Standard kit includes:

• Motorized laser power attenuator
• Controller
• Software
• Power suppy (DC 12 V)
• USB cable (1.5 m)

Available additional accessories:

• Attachable beam dump <6 W with protected coated window
• Separated beam dump <30 W
• RS232 cables: 1.8 m, 5 m, 10 m, 15 m
• DIN 35 rail adapter