Optical Choppers

Product catalog summary

Overview: The document provides a detailed description of the Model 3501 optical chopper, highlighting its stability, flexibility, and unique features. It is designed for precision optical chopping with a phase-locked internal frequency synthesizer.

Specifications:

Chopping frequency range: 4 Hz to 6.4 kHz.
Harmonic chopping: 2 to 15.
Sub-harmonic chopping: 1/2 to 1/15.
Phase jitter at 1 kHz: 0.4° rms.
Phase shifter range: -180° to +179°.
Controller size: 4×8.5×14.5 inches (102×216×368 mm).
Total weight: 14 lbs (6.4 kg).

Features:

Phase-locked to an internal frequency synthesizer for stability.
Outputs at the sum and difference of inner and outer wheels' frequencies for nonlinear-optics experiments.
High-stability phase shifter for locking two choppers together.
Variable duty-cycle chopping with dual wheel mounting.
Rack-mount kit available for standard 19" racks.

Performance:

Precision photo-etched wheels and high-quality DC motor ensure stable chopping with minimal jitter and drift.
Internal crystal-controlled frequency synthesizer and phase-locked loop for precise frequency locking.
Low phase noise near the chopping frequency, enhancing sensitivity and reducing noise floor in lock-in amplifier applications.

Comparison: The document compares the phase noise spectrum of the Model 3501 with a typical voltage-controlled chopper, demonstrating significantly reduced phase noise close to the chopping frequency due to its phase-locked design.

Pricing: The Model 3501 is priced at $1,925, with additional wheels available at $47 each. The rack mount kit is available for an additional $115.

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*Prices are pre-tax. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. Prices are indicative only and may vary by country, with changes to the cost of raw materials and exchange rates.

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