Manual Variable Attenuator, 780 - 820 nm

Newport's VA series of variable attenuators are composed of specially designed thin film polarizers, zero-order achromatic waveplates and high precision opto-mechanics, all incorporated into shuttered housings. The design is compact, robust and easy to use. Ideal for attenuating ultrafast amplified pulses.
The housing ensures the internal optics are free from dust and other contaminants, and eliminates perturbations of the beam due to ambient air conditions; crucial considerations in ultrafast laser applications. A manual shutter and beam dump are included to control the S- and P-polarized output beams.
Two thin film polarizers are prealigned in the housing and optimized for wavelengths ranging from 780 - 820 nm. The P-polarized output passes through the first thin film polarizer with negligible beam displacement, while the S-polarized output is reflected off both thin film polarizers and offset in parallel one inch.
By manually rotating a waveplate, the intensity ratio of the two output beams can be continuously varied while maintaining all other beam parameters.