Optical Chopper
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Catalog excerpts

Optical Chopper - 1

Ordering Information SR540 Optical chopper $1195 O5402530 25/30 dual-slot replacement blade $50 O54056 5/6 dual-slot replacement blade $50 O5405 5-slot replacement blade $50 O54030 30-slot replacement blade $50 O540RCH Replacement chopper head $350 Stanford Research Systems phone: (408)744-9040 www.thinkSRS.com Chop frequency 4 Hz to 400 Hz (5/6 slot blade) 400 Hz to 3.7 kHz (25/30 slot blade) Frequency stability 250 ppm/°C (typ.) Frequency drift <2 %, 100 Hz < f < 3700 Hz Phase jitter (rms) 0.2° (50 Hz to 400 Hz) 0.5° (400 Hz to 3.7 kHz) Frequency display 4-digit, 1 Hz resolution and accuracy Frequency control 10-turn pot with 3 ranges: 4 Hz to 40 Hz 40 Hz to 400 Hz 400 Hz to 3.7 kHz Input control voltage 0 to 10 VDC for 0 to 100 % of full scale (Control voltage overrides frequency dial) Reference modes ƒinner, ƒouter, 5 × ƒouter, ƒinner + ƒouter, ƒouter - ƒinner Dimensions Controller: 7.7" × 1.8" × 5.1" (WHD) Head: 2.8" × 2.1" × 1.0" (WHD) Blade diameter 4.04" ± 0.002" Cable length 6 ft. Power 12 W, 100/120/220/240 VAC, 50/60 Hz Warranty One year parts and labor on materials and workmanship, 90 days on motor SR540 Specifications Optical Chopper SR540 . Optical chopper system The SR540 chopper will handle all your optical chopping requirements.from simple measurements to dual-beam and intermodulation experiments. The SR540 has a 4-digit frequency display, front-panel frequency control, analogvoltage frequency control, and two reference outputs with selectable operating modes. Two anodized aluminum blades are provided: a 5/6 slot blade for frequencies up to 400 Hz, and a 25/30 slot blade for frequencies up to 3.7 kHz. Reference outputs are provided for frequencies corresponding to each row of slots, as well as the sum and difference frequencies. www.thinkSRS.com · 4 Hz to 3.7 kHz chopping frequencies · Low phase jitter · Single and dual beam experiments · Sum & difference reference outputs · Bolt clamp or rod mounting · SR540 ... $1195 (U.S. list)

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Optical Chopper - 2

Aperture 0.84" (6-slot) Aperture 0.62" (5-slot) In this application, a single optical beam is chopped by the outer row of slots, and the reference output from the right BNC is used to lock the lock-in amplifier to the chop frequency. The inner row of slots could also be used, in which case the left BNC would be the reference output. In either case, the REFERENCE MODE switch is in the “up” position. Stanford Research Systems phone: (408)744-9040 www.thinkSRS.com Single-Beam Experiment In this arrangement, the output from a single source is split and chopped at two different frequencies by...

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