Integrated Mirror Element for Solid State Laser Alignment
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Solution Overview
Problem
Standard optically pumped solid state lasers face challenges in aligning pump optics and achieving high power density due to limited brightness and cooling methods, leading to low gain and complex alignment processes.
Innovation Solution
The design incorporates a self-centering mirror element with pump radiation reflecting mirrors integrated into the second resonator mirrors, allowing direct reflection of pump radiation onto the end faces of the solid state laser media, simplifying alignment and enhancing power deposition through multiple paths, which improves heat distribution and gain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pump optics are precisely aligned with the optical mode of the laser resonator, then the gain of the laser device is improved, but the alignment complexity and fabrication difficulty increase
Solution Approach 1:
The patent combines the pump optics and resonator optics into a single integrated optical element. The pump radiation reflecting mirrors are integrally formed together with the second resonator mirrors in one single optical element, eliminating the need for separate alignment of pump optics with the laser resonator mode. This integration directly resolves the alignment complexity while maintaining laser gain performance.
2Power
If pump radiation is focused in a given active area of the laser medium, then the power density is improved, but the maximum dissipated power density is limited by the cooling method
Solution Approach 1:
The patent segments the laser medium into multiple regions with different doping concentrations. The pump beam is absorbed only in the doped blocks, allowing concentrated power deposition in specific regions while undoped regions serve as heat dissipation zones. This segmentation enables high power density in the active pumping regions without overwhelming the cooling system, as heat can be distributed to non-active regions.
3Reliability
If multiple pumping beams are focused onto different parts of the material multiple times, then the amplification is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent merges multiple optical functions (pump reflection, resonator formation, beam folding) into a single integral optical element. This single element achieves multiple passes of the pump beam through different parts of the laser medium without requiring separate mirrors or complex optical arrangements, thereby improving amplification while simplifying manufacturing.
Solution Approach 2:
The integral optical element serves multiple functions simultaneously: it acts as a pump radiation reflecting mirror, forms the second resonator mirror, and creates multiple beam paths through its geometric design. This multi-functionality achieves complex beam routing for enhanced amplification without adding separate components, maintaining manufacturing simplicity.
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 simplifies the alignment of pump optics, increases the gain of the laser device by distributing power effectively, and enhances cooling, resulting in a more compact and efficient optically end-pumped solid state laser device.
Implementation Method 1
one or several laser pump laser diodes and pump radiation reflecting mirrors are arranged to optically pump the solid state laser media by reflection of the pump radiation of the pump laser diodes at said pump radiation reflecting mirrors
Implementation Method 2
optically pump the solid state laser media... guide laser radiation of said laser resonator on at least two different straight paths through each of said laser media
Data Source
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AI summary
The present invention relates to an optically pumped solid state laser device, comprising one or several solid state laser media (100) in a laser resonator and one or several pump laser diodes (200) and pump radiation reflecting mirrors (300). The laser resonator is formed of one or several first resonator mirrors arranged at a first side of the solid state laser media(100) and one or several second resonator mirrors (310, 320, 330) arranged at a second side of the solid state laser media (100). The first and second resonator mirrors are arranged to guide laser radiation (500) on at least two different straight paths through each of said laser media (100). The pump laser diodes (200) are arranged to optically pump the solid state laser media (100) by reflection of pump radiation (510) at said pump radiation reflecting mirrors (300). The pump radiation reflecting mirrors (300) and the second resonator mirrors (310, 320, 330) are integrally formed in a single mirror element (600). With this design of the solid state laser device an easy alignment of the pump optics and an enhanced gain of the laser device are achieved. The proposed solid state laser device can be realized in a compact form.