Page 8 November 2009 w w w. n e w p o r t . c o m New Focus™ Amplitude Modulators Key Features Innovative design minimizes thermal birefringence High-quality lithium niobate crystals provide high contrast and low drive voltages Can be used as electronically variable wave plates Attenuating a laser beam with a Model 4104 amplitude modulator. The beam passes through the modulator followed by a polarizer. A Model 3211 broadbandmodulator driver is used to drive the modulator. M O D U L A T O R S New Focus™ amplitude modulators are specifically designed for high performance at modulation frequencies of up to 200 MHz. The Model 4102/4 broadband amplitude modulator can be operated from DC to 200 MHz. The Model 4101/3 is a resonant device that can be built to operate at any frequency from 0.01 to 200 MHz. The crystals in these modulators are mounted at 45° so that your input polarization can be either vertical or horizontal. To minimize thermal birefringence, we use two matched crystals arranged in series. This results in amplitude modulators that exhibit less than 1 mrad/°C of temperature-dependent polarization rotation. Model # (1) Type Wavelength Operating Frequency † Material Maximum Vπ On:off Extinction Ratio (typical †††) Max. Optical Intensity †† Aperture RF Bandwidth RF Connector Recommended RF Driver Models Impedance Maximum RF Power VSWR † †† 4102 Broadband AM 500–900 nm DC–200 MHz MgO:LiNbO3 195 V @ 633 nm 50:1 2 W/mm2 (532 nm) 2 mm 200 MHz SMA 3211 10 pF 10 W – 4104 Broadband AM 1.0–1.6 µm DC–200 MHz LiNbO3 300 V @ 1 µm 50:1 1 W/mm2 (1.3 µm) 2 mm 200 MHz SMA 3211 10 pF 10 W – (1) 4101 Resonant AM 500–900 nm 0.01–250 MHz † MgO:LiNbO3 19 V @ 633 nm 50:1 2 W/mm2 (532 nm) 2 mm 2–4% freq. SMA 3363 50 W 1W <1.5 4103 Resonant AM 1.0–1.6 µm 0.01–250 MHz † LiNbO3 30 V @ 1 µm 50:1 1 W/mm2 (1.3 µm) 2 mm 2–4% freq. SMA 3363 50 W 1W <1.5 For Model 4101/3, specify the resonant frequency when ordering. The maximum optical intensity varies with wavelength. ††† Typical value for a 0.5 mm diameter beam. Metric Versions: Add M to Model #. New Focus™ minimizes thermal drift by using two matched crystals to cancel polarization rotation effects to less than 1 mrad/°C. WEB See our website for more info. Please click here. Family of Brands — Corion® • New Focus™ • Oriel® Instruments • Richardson Gratings™ • Spectra-Physics®
http://www.newport.comhttp://www.newfocus.com/products/index.cfm?navid=3&theView=modelGroupDetail&productLineId=2&productGroupId=155&modelGroupId=1127http://www.newfocus.com/products/index.cfm?navid=3&theView=modelGroupDetail&productLineId=2&productGroupId=155&modelGroupId=1127
Table of Contents for the Digital Edition of Newport Spectra-Physics Newsletter - #31 - November 2009