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Optical Chopper

Product catalog summary

Ordering Information
The SR540 Optical Chopper is priced at $1195. Replacement blades are available: 25/30 dual-slot ($50), 5/6 dual-slot ($50), 5-slot ($50), and 30-slot ($50). A replacement chopper head costs $350. For inquiries, contact Stanford Research Systems at (408)744-9040 or visit www.thinkSRS.com.

Specifications
The SR540 Optical Chopper operates at frequencies from 4 Hz to 3.7 kHz, depending on the blade used. It features a frequency stability of 250 ppm/°C and a frequency drift of less than 2% for frequencies between 100 Hz and 3700 Hz. Phase jitter is 0.2° for 50 Hz to 400 Hz and 0.5° for 400 Hz to 3.7 kHz. The frequency display is 4-digit with 1 Hz resolution and accuracy. Frequency control is managed via a 10-turn potentiometer with three ranges: 4 Hz to 40 Hz, 40 Hz to 400 Hz, and 400 Hz to 3.7 kHz. Input control voltage ranges from 0 to 10 VDC, overriding the frequency dial. Reference modes include ƒinner, ƒouter, 5 × ƒouter, ƒinner + ƒouter, and ƒouter − ƒinner. The controller dimensions are 7.7" × 1.8" × 5.1", and the head dimensions are 2.8" × 2.1" × 1.0". The blade diameter is 4.04" ± 0.002", with a cable length of 6 ft. Power requirements are 12 W, 100/120/220/240 VAC, 50/60 Hz. The warranty covers one year for parts and labor on materials and workmanship, and 90 days on the motor.

Features
The SR540 Optical Chopper is suitable for single and dual-beam experiments, offering low phase jitter and sum & difference reference outputs. It can be mounted using a bolt clamp or rod. The system includes two anodized aluminum blades: a 5/6 slot blade for frequencies up to 400 Hz and a 25/30 slot blade for frequencies up to 3.7 kHz.

Applications
Single-Beam Experiment: A single optical beam is chopped by the outer row of slots, with the reference output used to lock the lock-in amplifier to the chop frequency. The inner row of slots can also be used, with the REFERENCE MODE switch in the "up" position.
Dual-Beam Experiment: The output from a single source is split and chopped at two different frequencies by the two rows of chopper slots. One beam passes through the experiment while the other serves as a reference beam. The beams are recombined and sent to the same detector, with two lock-ins used to detect signals at ƒinner and ƒouter. This setup helps remove effects due to changing source intensity and detector efficiency.

Catalog excerpts

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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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 the...

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