CVD Diamond Laser Shutter Absorber Plate
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Solution Overview
Problem
Existing laser shutter designs fail to handle high-intensity pulsed laser beams effectively due to limitations in broadband wavelength operation, high irradiance handling, laser-induced damage threshold, contamination issues, heat management, and mechanical reliability, particularly with moving mirrors and water-cooled absorbers.
Innovation Solution
A laser shutter utilizing chemical vapor deposition (CVD) diamond doped with graphite as absorber plates, which absorbs laser energy and conducts heat through a high thermal conductivity body, eliminating mirrors and addressing contamination and heat management concerns with a sliding mechanism and ferromagnetic puck for quiet movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If moving reflective mirrors are used to redirect laser beams, then beam redirection is achieved, but laser induced damage threshold decreases and broadband operation capability is lost
Solution Approach 1:
The patent removes the mirror component entirely from the optical path and replaces it with a direct absorption approach. The shutter blade material itself absorbs the laser energy rather than reflecting it, eliminating the need for wavelength-specific mirror coatings and thereby achieving broadband operation while maintaining high damage threshold.
Solution Approach 2:
The patent changes the fundamental interaction parameter between the optical component and laser beam from reflection to absorption. By selecting materials with high absorption coefficients across broadband wavelengths and high thermal conductivity, the system achieves both broadband operation and high damage threshold simultaneously.
2Ease of operation
If moving mirrors are used for beam redirection, then beam control is achieved, but mechanical complexity and fracture risk increase
Solution Approach 1:
The patent extracts the beam control function from the mechanical mirror system and implements it through the movement of an absorbing shutter blade. This eliminates the need for complex bearing systems and mechanical protection structures, simplifying the overall mechanical design while maintaining operational control.
3Temperature
If water-cooled ceramic coatings are used for optical absorption, then heat removal is achieved, but absorption time is limited and contamination occurs
Solution Approach 1:
The patent employs composite material structures combining high-absorption materials with high thermal conductivity substrates. This allows the surface to absorb laser energy effectively while the substrate rapidly conducts heat away, enabling both high absorption efficiency and extended operational duration without overheating.
Solution Approach 2:
The patent uses thin film absorbing coatings on substrates with high thermal conductivity. The thin film structure provides high absorption efficiency while the substrate acts as a heat sink, preventing heat buildup and enabling longer absorption durations. The thin film structure also reduces contamination compared to bulk ceramic coatings.
4Illumination intensity
If intense laser light sources are used, then high irradiance is achieved, but glass or absorbing film structures are quickly obliterated
Solution Approach 1:
The patent changes the material parameters to achieve both high irradiance handling and structural integrity. By selecting materials with high absorption coefficients and high thermal conductivity, the system can absorb intense laser energy and rapidly conduct it away, preventing localized overheating and structural failure even at high irradiance levels.
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 provides a high laser-induced damage threshold, broadband wavelength absorption, efficient heat management, and reduced contamination risks, enabling reliable operation with high-intensity laser pulses and maintaining low operating temperatures without mechanical failure.
Implementation Method 1
The sp2 graphite absorbs the laser energy from UV to IR. The level of sp2 doping controls the rate of absorption as the beam enters the crystal, providing an exponential decay of the beam and conversion to heat.
Implementation Method 2
The sp3 crystal structure of CVD diamond provides unmatched thermal conductivity to remove the heat. The sp2-doped diamond absorbs the laser light, converting it to heat, and quickly channels the heat out through the sliding interface.
Implementation Method 3
The invention takes advantage of naturally extremely low coefficient of friction of CVD diamond (sp3) to provide sliding between open and closed shutter positions.
Data Source
AI summary
A high-damage-threshold broadband laser shutter includes a black diamond absorber plate having a specified density of graphite (sp2) dopant dispersed therein to provide a selected amount of bulk optical absorbance of any incident beam. A heat sink block having a channel therein provides a laser light path to an exit aperture and further has a hard sliding interface on an exit surface thereof. A ferromagnetic frame holds the black diamond absorber plate in a slideable relation against the hard sliding interface of the heat sink block between a first position wherein the diamond absorber plate blocks the light aperture and a second position wherein the diamond absorber plate is located away from the light aperture. Electromagnetic means slide the frame together with the black diamond absorber plate between the first and second positions.