Wavelength Conversion Laser Beam Position Stabilization
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Solution Overview
Problem
Conventional wavelength conversion laser devices face challenges in maintaining a constant light exiting position due to displacement of the non-linear optical crystal during phase-matching, which degrades precision and is particularly problematic for miniaturized products like mobile projectors.
Innovation Solution
A wavelength conversion laser device that includes a rotational driver for the non-linear optical crystal, a controller for detecting output changes and generating rotational control signals, a beam location maintaining mirror for retroreflecting light along the original path, and an output beam distributor to guide the retroreflected light in a desired direction, maintaining the light exiting position constant and enhancing wavelength conversion efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the non-linear optical crystal is displaced to adjust the incidence angle for phase-matching, then the wavelength conversion efficiency is improved, but the light exiting position changes which degrades precision
Solution Approach 1:
A beam location maintaining mirror is introduced as an intermediary component between the non-linear optical crystal and the output beam distributor. This mirror reflects the light beam to compensate for position changes caused by crystal displacement, thereby maintaining a constant light exiting position while allowing the crystal to be displaced for optimal phase-matching conditions
Solution Approach 2:
The system changes the position parameter of the non-linear optical crystal to optimize wavelength conversion efficiency through phase-matching, while simultaneously using a beam location maintaining mirror to counteract the resulting position change and maintain a constant light exiting position
2Stability of the object's composition
If a beam location maintaining structure is added to compensate for crystal displacement, then the light exiting position stability is improved, but the device complexity increases
Solution Approach 1:
A beam location maintaining mirror is introduced as an intermediary component between the non-linear optical crystal and the output beam distributor. This mirror reflects the light beam to compensate for position changes caused by crystal displacement, thereby maintaining a constant light exiting position while allowing the crystal to be displaced for optimal phase-matching conditions
Solution Approach 2:
The beam location maintaining mirror serves multiple functions: it maintains the light exiting position constant, works with the output beam distributor to guide light in the desired direction, and enables the system to achieve both position stability and simplified configuration
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 maintains a constant light exiting position and increases wavelength conversion efficiency, making it suitable for miniaturized applications while simplifying the optical system configuration.
Implementation Method 1
a non-linear crystal for generating a second harmonic wave
Implementation Method 2
a beam location maintaining mirror for retroreflecting the second wavelength light, outputted from the non-linear optical crystal, along a substantially same path as that of the first wavelength light
Data Source
AI summary
In a wavelength conversion laser device, a laser light source emits first wavelength light. A non-linear optical crystal converts the first wavelength light into second wavelength light. A rotational driver rotates the non-linear optical crystal so as to alter an incidence angle of the first wavelength light with respect to the non-linear optical crystal. A rotational driving controller detects a portion of an output of the second wavelength light, generates a rotational control signal of the non-linear optical crystal in accordance with a change in the output, and transmits the rotational control signal to the rotational driver. A beam location maintaining mirror retroreflects the second wavelength light, outputted from the non-linear optical crystal, along a substantially same path as that of the first wavelength light. Also, an output beam distributor guides the retroreflected second wavelength light in a desired output direction.