Application Cases

【Overview】
In this study, the Aigtek ATA-2088 high-voltage amplifier was used to build an optical measurement experimental system, providing a phase-locking technical solution with high stability and wide dynamic range for precision optical measurements.

Experiment Name: Research on Continuous Phase Locking of an Interferometer Based on Dual-Beam Polarization Multiplexing

Experiment Objective:
This study aims to verify the effectiveness of the continuous phase-locking scheme for an interferometer based on dual-beam polarization multiplexing. By constructing a common-path interferometric optical path and a feedback control system, the study focuses on validating the ability of this scheme to achieve continuous phase locking over a full cycle. The phase-locking accuracy, signal-to-noise ratio, and dynamic response characteristics are evaluated, providing a phase-locking technical solution with high stability and wide dynamic range for precision optical measurements.

Testing Equipment:
Mach-Zehnder interferometer optical platform (semiconductor laser, polarization control components, beam splitter, polarization beam splitter, piezoelectric mirror, electro-optic modulator), feedback control system (balanced detector, analog PID controller, ATA-2088 high-voltage amplifier), and signal generation and acquisition system (signal generator, oscilloscope, spectrum analyzer).

Experimental Procedure:
This study systematically validated the performance of the continuous phase-locking scheme by constructing a dual-beam polarization multiplexing interferometric system, combining theoretical analysis and experimental measurements. The full-cycle locking mechanism based on an electro-optic modulator and PID feedback was analyzed theoretically. Experimentally, an optical platform was built, and tests for full-cycle phase scanning, signal-to-noise ratio, and dynamic response were conducted. The results show that the system achieves continuous and stable locking over the range of 0–2π, with an accuracy of 0.19°. It also exhibits dynamic performance and pulse light compatibility, effectively verifying the practical value of this scheme in precision optical measurements.

Figure 1: Experimental setup of the continuous phase-locking interferometer based on dual-beam polarization multiplexing.
(a) Optical path diagram, (b) Physical diagram of the system.

Experimental Results:

Figure 2: Changes in the intensity difference of the interference signal output from the detection end (BD2) before and after phase locking.

Figure 3: Normalized mean intensity (solid line) and standard deviation (dashed line) of the interference signal at the detection end (BD2) under phase-locked conditions over the full cycle.

Figure 4: Phase-locking accuracy of the detection end (BD2) over the full cycle, where the dashed line represents the average phase-locking accuracy over the full cycle.

Figure 5: Signal-to-noise ratio under continuous phase sweeping (solid line) and discrete phase-locking points (scatter points).

Figure 6: (a) Dynamic phase-locking performance of the system under continuous light conditions; (b) Dynamic phase-locking performance of the system under pulsed light conditions.
The solid line represents the intensity difference of the interference signal output from the detection end (BD2), and the dashed line represents the amplitude of the driving voltage of the EOM.

Advantages of Aigtek Amplifiers in This Application:

1. High voltage output – Ensures the driving capability for full-cycle, large-range scanning of the piezoelectric mirror.

2. Wide bandwidth and high slew rate – Achieves high dynamic response of the piezoelectric mirror.

3. Low distortion and real-time monitoring (Monitor) function – Ensures high-precision closed-loop control.

Recommended Product: ATA-2088 High-Voltage Amplifier

Figure: ATA-2088 High-Voltage Amplifier Specifications and Parameters