Dual-Laser Polarization Combining for Continuous Projection Output
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Solution Overview
Problem
Existing laser projection systems face challenges in maintaining consistent laser beam intensity and continuity of operation due to potential failures of individual laser diodes, and lack flexibility in adjusting power for specific projection needs.
Innovation Solution
A device using two laser diodes with perpendicular polarizations, combined through a polarization combiner, with a control unit that adjusts intensity based on measured values to ensure continuous operation and flexible power settings, including automatic switching between diodes and pulse width modulation for precise power control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single laser diode is used for projection, then the device structure is simple, but the operation continuity is compromised due to potential diode failure
Solution Approach 1:
The single laser source is segmented into two separate laser diodes with perpendicular polarizations. Each diode can operate independently, so if one fails, the other continues to provide projection capability, thereby improving reliability and operation continuity.
Solution Approach 2:
The system prepares redundant laser diodes in advance with different polarizations. This beforehand cushioning ensures that if one diode fails, the system already has another diode ready to take over, maintaining operation continuity without requiring immediate replacement or complex real-time switching mechanisms.
2Power
If two laser diodes are combined to increase power, then the light strength is doubled, but the polarization alignment becomes complex
Solution Approach 1:
Instead of using two identical polarizations that would require precise alignment, the invention uses asymmetric polarizations (perpendicular to each other) for the two laser diodes. This asymmetry simplifies the combining process because the perpendicular polarizations naturally separate and combine without requiring complex alignment mechanisms, while still achieving doubled light strength.
3Illumination intensity
If laser beam intensity is increased for better visibility, then the projection clarity improves, but the risk of diode failure and energy loss increases
Solution Approach 1:
The system uses two laser diodes where each diode operates at a moderate power level individually, but together they provide excessive or sufficient total power for clear projection. This partial action approach allows each diode to operate within safe limits, reducing energy loss and failure risk, while the combined output maintains high illumination intensity for projection clarity.
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
This solution maintains consistent and adjustable laser beam intensity, ensures continuous operation by automatically switching between diodes, and allows for flexible power adjustments to emphasize or deemphasize parts of a projected figure, enhancing operational reliability and clarity.
Implementation Method 1
two laser diodes with the same wavelength are provided. The beams of the laser diodes are each polarized linearly, wherein the polarization axes or directions are perpendicular to each other in pairs. Furthermore, a polarization combiner is provided that combines the incident beams of the laser diodes into a combined beam with circular or elliptical polarization
Data Source
AI summary
A device for laser projection comprises a first laser diode configured to emit a first linearly polarized laser beam extending along a first polarization axis and a second laser diode configured to emit a second linearly polarized laser beam extending along a second polarization axis that is perpendicular to the first polarization axis. A polarization combiner is configured to combine the first and second linearly polarizing laser beams into a combined laser beam, wherein the combined laser beam comprises one of: (1) circular polarization; and (2) elliptical polarization. A measuring device is configured to measure an intensity of the combined laser beam. A control unit is configured to receive the measured intensity of the combined laser beam and is further configured to adjust an intensity of at least one of: (1) the first laser diode; and (2) the second laser diode.