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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

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Programmable focused laser differential interferometer with a spatial light modulator as a dynamic diffractive

Seth Holladay, Zhili Zhang

|September 29, 2023

Summary

This summary is machine-generated.

Spatial light modulated-focused laser differential interferometry (SLM-FLDI) measures jet dynamics. This technique shows similar spectral profiles to traditional methods, expanding FLDI capabilities for flow analysis.

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Area of Science:

Fluid dynamics
Optical metrology
Aerodynamics

Background:

Focused laser differential interferometry (FLDI) is a key technique for flow measurement.
Spatial light modulators (SLMs) offer dynamic control over light beams.
Integrating SLMs into FLDI can potentially enhance its capabilities for complex flow diagnostics.

Purpose of the Study:

To investigate the feasibility of using a spatial light modulator (SLM) within a focused laser differential interferometer (FLDI).
To generate a nonlinear array of beams for measuring the power spectral density of an underexpanded air jet.
To compare the performance of the novel SLM-FLDI system with a conventional 1-point FLDI.

Main Methods:

Incorporation of an SLM into an FLDI setup to create a nonlinear beam array.
Measurement of the power spectral density of a Mach-1.5 underexpanded air jet using the SLM-FLDI.
Comparative analysis of spectral data obtained from SLM-FLDI and a standard 1-point FLDI.

Main Results:

The SLM-FLDI successfully generated a nonlinear beam array for flow measurements.
Spectral profiles obtained from SLM-FLDI closely matched those from the 1-point FLDI.
Dominant frequencies in the jet were accurately detected by the SLM-FLDI system.

Conclusions:

SLM-FLDI is a feasible technique for flow diagnostics.
SLMs can act as dynamic diffractive elements, enabling flexible beam array generation in FLDI.
The SLM-FLDI system offers a promising expansion of FLDI capabilities for analyzing complex flow phenomena.