MBE Optical Path Layout for Precise Direct Laser Writing
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Solution Overview
Problem
The existing laser auxiliary system for Molecular Beam Epitaxy (MBE) devices suffers from inadequate laser focusing precision due to a considerable distance between the refracted optical path and the silicon-based substrate, compromising the quality of laser processing.
Innovation Solution
A laser processing system integrated with an MBE device, featuring an optical path mechanism that extends into the MBE growth chamber, a heat insulation mechanism to minimize heat radiation, and a cooling mechanism to maintain the optical path mechanism's temperature within a normal operating range, enabling direct laser writing and precise processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If light is reflected by an external optical path system through a reserved window at the bottom of the MBE device chamber, then the laser can reach the silicon-based substrate, but the considerable distance between the refracted optical path and the substrate compromises laser focusing capability and processing precision
Solution Approach 1:
The patent transitions from a bottom-window optical entry (vertical dimension) to a side-opening optical entry (horizontal dimension), allowing the optical path mechanism to extend laterally into the chamber and position the objective lens in close proximity to the substrate, thereby resolving the focusing precision issue caused by excessive vertical distance
Solution Approach 2:
The patent introduces an optical path mechanism as an intermediary component that includes an objective lens positioned close to the substrate. This intermediary structure enables direct laser writing by mediating between the external laser source and the substrate, eliminating the need for long-distance optical transmission through the chamber bottom
2Manufacturing precision
If the optical path mechanism extends into the MBE growth chamber for close-proximity laser processing, then laser focusing capability is enhanced, but heat radiation from the high-temperature vacuum environment may affect the lens and optical components
Solution Approach 1:
The patent extracts the objective lens and critical optical components into a separate optical path mechanism that is hermetically connected to the MBE chamber through a side opening. This extraction allows the optical components to be isolated from the high-temperature vacuum environment while maintaining close proximity to the substrate for precise laser processing
Solution Approach 2:
The optical path mechanism acts as an intermediary barrier between the high-temperature vacuum environment and the sensitive optical components. The hermetic connection allows optical transmission while protecting the lens from direct exposure to harmful thermal radiation in the MBE chamber
3Manufacturing precision
If the optical path mechanism operates in close proximity to the high-temperature substrate for direct laser writing, then processing precision is improved, but heat accumulation in the optical path mechanism may affect its normal operation
Solution Approach 1:
The patent extracts the optical path mechanism from the high-temperature vacuum environment of the MBE chamber, positioning it outside the chamber with hermetic connection. This extraction removes the optical components from the harmful thermal environment while maintaining close proximity to the substrate through the extended optical path, thereby preventing heat accumulation that would affect normal operation
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 configuration enhances laser focusing capability, ensures precision and quality in laser processing, and allows the system to operate effectively in a high-temperature vacuum environment, while maintaining the optical path mechanism's temperature within a suitable range.
Implementation Method 1
The cooling mechanism is positioned on the outer side of the optical path mechanism and comprises a cooling channel. A heat exchange medium flows through the cooling channel, rapidly dissipating heat accumulated by the optical path mechanism to the exterior.
Implementation Method 2
A heat exchange medium flows through the cooling channel, rapidly dissipating heat accumulated by the optical path mechanism to the exterior.
Implementation Method 3
The heat insulation mechanism is placed on the side of the light emitting end of the optical path mechanism and is utilized to minimize heat radiation reaching the lens of the optical path mechanism.
Implementation Method 4
The objective lens, positioned at the end of the internal optical path assembly away from the external optical path assembly, acts as the light emitting end of the optical path mechanism. A laser, emitted by the external laser device, is reflected into the internal optical path assembly via the external optical path assembly and processes the substrate sample material through the objective lens.
Data Source
AI summary
Provided herein is a laser processing system integrated with an MBE device, including an MBE growth chamber, a sample table, an optical path mechanism, a heat insulation mechanism, and a cooling mechanism. An opening is formed in a side of the MBE growth chamber. The sample table is fixed in the MBE growth chamber, corresponds to a position of the opening, and is used for placing a substrate sample material. The optical path mechanism is relatively arranged on a side of the MBE growth chamber, and the optical path mechanism is provided with a light-emitting end. A side of the light-emitting end penetrates through the opening of the MBE growth chamber, extends into the MBE growth chamber, and is spaced apart from the sample table. The optical path mechanism is sealedly connected to the opening of the MBE growth chamber. By integrating the optical path mechanism within the MBE device and utilizing direct laser writing, the system facilitates close-range processing of the sample, enhancing the laser's focusing capability and effectively ensuring the precision and quality of laser processing.