The SR540 Optical Chopper is used for square wave modulation of light signal intensity. This device can chop a light source at frequencies from 4 Hz to 3.7 kHz. The versatile, low-jitter reference output provides synchronization signals required for various operating modes: single-beam or dual-beam; sum and difference frequencies; and synthesized chopping up to 20 kHz.

Main Technical Parameters:
◆Frequency Range: 4 Hz ~ 3.7 kHz (Inner Hole: 4 Hz ~ 400 Hz; Outer Hole: 400 Hz ~ 3.7 kHz)
◆Frequency Output Accuracy: <2%
◆Phase Stability: 0.2° ~ 0.5°
◆Open-Type Chopping Device
◆Chopper Blade Treated with Photochemical Etching (Blackening) and Demagnetization

SR540 Optical Chopper: Features stable chopping frequency and high precision, making it a modern component for modulated optical measurements. It is primarily used in research such as fiber amplifier characteristic measurements, fiber grating sensing, and optoelectronic material property analysis, ranging from simple experiments to dual-beam and internal modulation measurements. The SR540 includes voltage-controlled input, a four-digit frequency display, ten-segment frequency control, and a reference output with two optional operating modes. It offers a chopping frequency range of 4 Hz to 3.7 kHz, single-beam and dual-beam modulation, low phase jitter, and sum and difference frequency reference signal inputs.

When used in conjunction with a lock-in amplifier, the SR540 Optical Chopper can form a weak optical signal detection system for spectroscopy. It can also be applied in tests related to electrical and magnetic studies.