Safely attenuating the output of ultrafast amplifiers (UFAs), the manual UVA-800-M and motorized UVA-800-CONEX ultrafast variable attenuators (UVAs) employ special thin-film polarizers, zero-order achromatic waveplates, and high-precision opto-mechanics. The thin-film polarizers operate in conjunction with a half-waveplate providing continuously adjustable intensity ratio splitting of the dual S- and P-polarized outputs. The motorized version rotational stage integrates a CONEX controller/driver, which derives powered and communicates with a computer via USB port. A free NSTRUCT applet to control the stage is available for download from the company’s website. NEWPORT CORP., Irvine, CA. (800) 222-6440.