Laser Light Generation via Threshold Management and Modulation
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Solution Overview
Problem
Laser light sources face challenges in efficiently generating light with desired intensity and wavelength for image projection, particularly when operating below the minimum lasing threshold, leading to non-linear power-versus-current relationships and color inaccuracies due to broad wavelength distributions.
Innovation Solution
A method and system that calculate and adjust the operating power of a lasing module based on target power and minimum lasing power, using an optical modulator to attenuate or amplify the output light, and a wavelength selection module to tune the wavelength based on temperature, ensuring operation above the minimum lasing threshold and matching the wavelength to the display element's requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the laser operates below the minimum lasing threshold, then power consumption is reduced, but the wavelength distribution becomes broad causing color inaccuracies
Solution Approach 1:
An external laser diode is introduced as an intermediary light source to provide the minimum lasing threshold power. This external diode operates independently at its optimal threshold current, while the original laser diode operates below threshold with reduced power consumption. The combination maintains narrow wavelength distribution and color accuracy without requiring the main laser to consume high power.
Solution Approach 2:
The laser system is segmented into two independent light sources: an external laser diode that provides the minimum threshold power, and the main laser diode that operates below threshold for efficient power consumption. This segmentation allows each component to operate in its optimal regime, resolving the contradiction between power efficiency and color accuracy.
2Manufacturing precision
If the laser operates above the minimum lasing threshold, then color accuracy is improved through narrow wavelength distribution, but power consumption increases
Solution Approach 1:
The external laser diode acts as a mediator that provides the necessary threshold power to achieve narrow wavelength distribution and color accuracy. The main laser diode can then operate below its threshold with lower power consumption while the external diode compensates for the power difference, maintaining overall color accuracy.
Solution Approach 2:
The operating parameters of the laser system are changed by introducing an external light source with specific characteristics (wavelength, power, beam quality) that complement the main laser diode. This parameter change allows the main laser to operate at lower current while maintaining the narrow wavelength distribution needed for color accuracy.
3Use of energy by moving object
If the target power is below the minimum lasing power, then power efficiency is improved, but the laser cannot operate without external assistance
Solution Approach 1:
An external laser diode is introduced as a mediator to enable the main laser to operate below its minimum lasing threshold. This external component provides the necessary optical power to maintain lasing action while allowing the main laser to consume less electrical power, achieving power efficiency despite increased system complexity.
Solution Approach 2:
The external laser diode serves multiple functions: providing the minimum threshold power, enabling operation at reduced main laser current, and maintaining narrow wavelength distribution. This multi-functionality justifies the added system complexity by delivering multiple benefits simultaneously.
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 approach allows for efficient generation of laser light with a narrower wavelength spectrum, reducing color inaccuracies and complexity in power management, enabling precise intensity control for image projection while maintaining optimal operating conditions.
Implementation Method 1
a lasing module to generate an output light
Implementation Method 2
an optical modulator to attenuate or amplify the output light
Data Source
AI summary
There is provided a method of operating a laser. The method comprises receiving a target power and calculating an operating power of a lasing module of the laser. The operating power may be calculated based on the target power and a minimum lasing power of the lasing module. The method also comprises determining an operating current for the lasing module based on the operating power, and driving the lasing module at the operating current to produce an output light having the operating power. In addition, the method comprises providing the output light to an optical modulator of the laser, and operating the optical modulator to modulate the output light to have an output power corresponding to the target power.