Directly Modulated Spatial Light Modulator with VCSEL and SOA
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Solution Overview
Problem
Current spatial light modulators (SLMs) rely on indirect modulation and lack the ability to provide broad pixel intensity control, polarization change on individual pixels, and efficient optical signal input for holographic storage, particularly due to the limitations of edge-emitting diode lasers and the need for external beam correction.
Innovation Solution
A directly modulated spatial light modulator utilizing a semiconductor optical amplifier (SOA) with controlled gain saturation and a Michelson interferometer setup, incorporating a semiconductor optical amplifier and a vertical cavity surface emitting laser (VCSEL) with anti-reflection coatings to achieve phase changes in optical signals, enabling fast optical switching and holographic storage capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If indirect modulation is used in spatial light modulators, then device complexity is reduced, but pixel intensity control capability is limited
Solution Approach 1:
The patent employs direct modulation of the semiconductor optical amplifier by changing the injection current parameter to control the optical output intensity. This allows continuous adjustment of pixel intensity without complex mechanical or optical mechanisms, achieving fine-grained intensity control through electrical parameter variation alone.
2Power
If edge-emitting diode lasers are used, then laser output is achieved, but external beam correction is required
Solution Approach 1:
The patent replaces mechanical beam correction systems with an integrated VCSEL design that inherently produces circular symmetric beams. By substituting the edge-emitting laser with a vertical-cavity surface-emitting laser, the mechanical complexity of external astigmatic beam correction is eliminated while maintaining high laser output power.
3Quantity of substance
If large 2D VCSEL arrays are etched onto a single substrate, then array density is increased, but heat removal becomes difficult
Solution Approach 1:
The patent segments the large 2D VCSEL array into smaller modular units that can be independently cooled. This segmentation allows heat to be removed more efficiently from each module rather than attempting to cool a single large array, maintaining high VCSEL density while solving the thermal management problem through distributed cooling architecture.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution allows for broader pixel intensity control, polarization change on individual pixels, and efficient optical signal input without moving parts, enhancing the capabilities of spatial light modulators for holographic storage and optical switching.
Implementation Method 1
controlled gain saturation
Implementation Method 2
achieve phase changes in optical signals
Implementation Method 3
anti-reflection coatings
Implementation Method 4
Vertical Cavity Surface Emitting Lasers (VCSELs)... emits power perpendicularly from its surface
Implementation Method 5
Michelson interferometer setup
Data Source
AI summary
A directly modulated spatial light modulator (DM-SLM) may be formed using a semiconductor optical amplifier. The directly modulated spatial light modulator may also be formed with a vertical cavity surface emitting laser having an output side; and an anti-reflection coating located on the output side.