Laser Pumped Light Source Plasma Brightness Optimization
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Solution Overview
Problem
Laser-pumped light sources face limitations in achieving maximum radiation brightness due to suboptimal geometry and inefficient absorption of laser irradiation, with existing solutions complicating the design and not effectively blocking divergent laser beams.
Innovation Solution
The design optimizes the laser pumping mode and plasma region geometry, with a focused laser beam numerical aperture and power selected to extend the plasma region along the axis, using a blocker with a lower numerical aperture to absorb or reflect divergent laser beams, and positioning the optical system on the axis for enhanced plasma radiation collection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the blocker is placed directly in the light source chamber to block divergent laser beams, then the laser radiation is effectively blocked, but the design of the chamber and light source becomes complicated and the blocker is exposed to large radiating loads
Solution Approach 1:
The blocker is extracted from the light source chamber and placed in the optical system instead. This removes the blocker from the high-radiation environment inside the chamber, simplifying the chamber design while maintaining the blocking function in the optical path where radiation levels are manageable.
2Reliability
If the blocker is mounted on the axis of the focused laser beam to block divergent beams, then the laser radiation is blocked, but the plasma radiation cannot be output along the axis and must be directed at the mirror at large angles
Solution Approach 1:
The blocker function is extracted from the axial position and implemented as a separate element in the optical system. This allows the plasma radiation to be collected and output along the axis at optimal angles, while the blocker remains in position to suppress the divergent laser beam without interfering with the plasma radiation collection.
3Reliability
If plasma radiation is collected at large angles to the axis of the focused laser beam, then the divergent laser beam can be blocked, but the radiation brightness is not optimal
Solution Approach 1:
The optical system acts as an intermediary between the plasma region and the output. It collects plasma radiation at optimal angles along the axis while using the blocker as a separate control element to suppress the divergent laser beam. This mediation allows both functions to operate at their optimal parameters independently.
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 approach significantly increases the brightness of broadband plasma radiation, improves absorption efficiency, and simplifies the light source design, leading to higher reliability and longer service life while effectively blocking unwanted laser radiation.
Implementation Method 1
a laser, providing the laser beam; an optical element, focusing the laser beam from a first side of the chamber, a region of radiating plasma, created in the chamber using a focused laser beam
Implementation Method 2
region of radiating plasma, created in the chamber using a focused laser beam
Implementation Method 3
a blocker, installed on an axis of a divergent laser beam from a second side of the chamber, opposite the first side
Implementation Method 4
using a blocker with a lower numerical aperture to absorb or reflect divergent laser beams
Data Source
AI summary
The invention relates to light sources with laser pumping and to methods for generating radiation with a high luminance in the ultraviolet (UV) and visible spectral ranges. The technical result of the invention includes extending the functional possibilities of a light source with laser pumping by virtue of increasing the luminance, increasing the coefficient of absorption of the laser radiation by a plasma, and significantly reducing the numerical aperture of a divergent laser beam which is to be occluded and which is passing through the plasma. The device comprises a chamber containing a gas, a laser producing a laser beam, an optical element, a region of radiating plasma produced in the chamber by the focused laser beam, an occluder, which is mounted on the axis of the divergent laser beam on the second side of the chamber, and an optical system for collecting plasma radiation.