Nonlinear Crystal Light Source for Low-Power Laser Projection
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Solution Overview
Problem
Current laser projection display technologies face challenges with complex structures, high power consumption, large volume, and poor beam quality, making them unsuitable for portable and wearable devices.
Innovation Solution
A light source system utilizing infrared laser light sources as pump sources and nonlinear optical crystals for frequency conversion, producing visible Gaussian beams with high beam quality, low power consumption, and a simple structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If edge-emitting laser or VCSEL is used as light source, then laser projection display function is achieved, but structure becomes complex and volume increases
Solution Approach 1:
The patent changes the fundamental parameters of the light source system by using infrared laser combined with nonlinear optical crystals for frequency conversion, rather than traditional visible laser diodes. This parameter change enables simplified structure while maintaining laser projection display performance.
Solution Approach 2:
The patent segments the light generation process into two independent parts: infrared laser generation and frequency conversion to visible light. This segmentation allows each component to be optimized separately, reducing overall system complexity while improving performance.
2Reliability
If edge-emitting laser or VCSEL is used as light source, then laser projection display function is achieved, but power consumption increases
Solution Approach 1:
The patent changes the operating wavelength parameter to infrared region where laser diodes have higher efficiency and lower threshold current, reducing power consumption while maintaining the ability to generate visible light through frequency conversion.
3Reliability
If edge-emitting laser or VCSEL is used as light source, then laser projection display function is achieved, but beam quality deteriorates
Solution Approach 1:
The patent introduces nonlinear optical crystals as an intermediary medium that converts infrared laser light to visible light. This intermediary process produces superior beam quality with Gaussian distribution, overcoming the beam quality limitations of direct visible laser diodes.
4Reliability
If edge-emitting laser or VCSEL is used as light source, then laser projection display function is achieved, but packaging complexity increases
Solution Approach 1:
The patent segments the optical system into modular components: infrared laser diode, nonlinear optical crystal, and optical coupling elements. This segmentation simplifies packaging by allowing each component to be independently optimized and assembled, reducing packaging complexity.
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 system achieves high beam quality, low power consumption, and simplified packaging, meeting the requirements for portable and wearable devices with improved projection display resolution.
Implementation Method 1
A plurality of nonlinear optical crystals are used to perform frequency conversion on the infrared laser generated by the infrared laser light sources
Data Source
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AI summary
This application provides a light source system and a laser projection display device. The light source system and the laser projection display device are applied to the field of laser projection display. The light source system includes an infrared laser light source and a nonlinear optical crystal array. An input end of the nonlinear optical crystal array is connected to an output end of the infrared laser light source, the nonlinear optical crystal array is configured to: perform frequency conversion on an infrared laser generated by the infrared laser light source, and output a laser obtained after the frequency conversion, the infrared laser light source is a pump light source, the nonlinear optical crystal array includes at least one nonlinear optical crystal, each nonlinear crystal is configured to output a single-mode Gaussian beam, an output end of the nonlinear optical crystal array outputs a coaxial visible Gaussian laser beam, and the coaxial visible Gaussian laser beam provides a light source for laser projection display. The light source system provided in this application has a simple structure, a small volume, and relatively low power consumption, and therefore fundamentally meets requirements of high beam quality, low power consumption, a simplified packaging architecture, and a low-cost packaging process.