Monolithic Side-Pumped Solid-State Laser for High-Power Medical Tissue Ablation
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Solution Overview
Problem
Existing side-pumped solid-state lasers face limitations in generating high power laser pulses with long duration and high repetition rate, are expensive to produce, and are not robust against shock and vibration, making them unsuitable for medical applications requiring efficient tissue ablation.
Innovation Solution
A monolithic, side-pumped solid-state laser with a laser resonator structure featuring a small diameter laser gain medium, optimized pump power distribution, and symmetrical cooling to enhance beam quality and intensity, reducing manufacturing costs and increasing robustness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional side-pumped solid-state laser designs are used, then laser power and pulse duration can be increased, but manufacturing complexity and cost increase significantly
Solution Approach 1:
The patent merges the gain medium and cooling structure into a single integrated monolithic component. The gain medium is formed as a slab with cooling channels directly embedded within it, eliminating the need for separate cooling assemblies and complex alignment mechanisms. This integration maintains high laser power capability while significantly reducing manufacturing complexity and cost.
Solution Approach 2:
The gain medium slab serves multiple functions simultaneously: it acts as the laser active medium, provides structural support, and contains integrated cooling channels for thermal management. This multi-functionality reduces the number of separate components needed, thereby simplifying manufacturing while maintaining high power operation.
2Power
If conventional side-pumped solid-state laser designs are used, then laser power can be increased, but production cost increases
Solution Approach 1:
The integration of cooling channels within the gain medium slab reduces the number of separate components that need to be manufactured and assembled. This monolithic design simplifies production processes, reduces assembly steps, and lowers overall manufacturing costs while maintaining high laser power output.
Solution Approach 2:
The patent employs laser-based manufacturing techniques to create the cooling channels within the gain medium. This advanced manufacturing approach, while enabling complex internal structures, can be automated and scaled, thereby reducing per-unit production costs despite the increased geometric complexity.
3Power
If conventional solid-state laser designs are used, then laser power can be increased, but robustness against shock and vibration decreases
Solution Approach 1:
The monolithic integration of the gain medium and cooling structure eliminates multiple mechanical interfaces and alignment mechanisms that are vulnerable to shock and vibration. The single-piece construction provides inherent mechanical robustness while maintaining high laser power capability.
Solution Approach 2:
The gain medium is formed as a composite structure with integrated cooling channels, creating a unified mechanical assembly that resists shock and vibration. This composite design combines the optical properties of the laser-active material with the thermal management capabilities of the cooling structure in a single robust component.
4Power
If Q-switched laser configurations are used, then pulse energy can be increased, but pulse duration becomes very short
Solution Approach 1:
The patent employs active Q-switching mechanisms that dynamically control the optical cavity properties during the laser pulse. By modulating the Q-factor in real-time, the system can generate high pulse energy while controlling the pulse duration to be in the microsecond range, rather than the nanosecond range typical of passive Q-switching.
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 enables the generation of high-powered laser pulses with improved beam quality and efficiency, suitable for medical applications, including tissue ablation, with reduced maintenance and production costs, and enhanced robustness against environmental changes.
Implementation Method 1
A monolithic, side-pumped solid-state laser comprises a laser resonator structure comprised of a laser gain medium
Implementation Method 2
comprising a conductive cooler comprising contact faces contacting the laser gain medium
Implementation Method 3
comprising a reflector arranged opposite to the side face with respect to the longitudinal axis L
Data Source
AI summary
A monolithic, side pumped solid-state laser (1) comprising a laser resonator structure (3) comprised of a laser gain medium (2) having a longitudinal axis (L), wherein the laser resonator structure (3) comprises end faces (4) forming a linear optical path resonant cavity there between, at least one of the end faces (4) comprising at least partially reflecting laser mirrors (4a, 4b) in particular deposited thereon, the laser gain medium (2) comprising a side face (2a) for receiving pump light (5a) of a pump source (5), wherein the pump light (5a) is generated by a diode laser (5), and comprising a conductive cooler (6) comprising contact faces (6c) contacting the laser gain medium (2), and comprising a reflector (7) arranged opposite to the side face (2a) with respect to the longitudinal axis (L), wherein the laser gain medium (2) is a low gain material.