Solid State Laser Temperature Tuning Mechanism
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Solution Overview
Problem
Conventional solid state laser devices face challenges in performing high precision temperature tuning without outputting high energy lasers, which can cause damage to unintended targets during temperature tuning, and have limited range of output and drive current change.
Innovation Solution
The solid state laser device includes a semiconductor laser, a solid state laser medium, second and third harmonic generating elements within an optical resonator, temperature controllers, and a temperature tuning mechanism that sweeps the temperatures of these elements to determine optimal operating points, allowing for high precision tuning without high energy output, even with high drive current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the drive current of the semiconductor laser is reduced to prevent high energy laser output during temperature tuning, then damage to unintended targets is avoided, but the range of change in output and drive current becomes small, making high precision temperature tuning difficult
Solution Approach 1:
The patent applies preliminary action by setting one temperature controller (for the second harmonic generating element) to a temperature shifted away from the optimal temperature before performing temperature tuning on the other element (third harmonic generating element). This preliminary temperature offset ensures that even when the semiconductor laser operates at high drive current, the overall third harmonic output remains suppressed, preventing damage to unintended targets during the tuning process
Solution Approach 2:
The patent utilizes parameter changes by dynamically adjusting the temperatures of the harmonic generating elements during the tuning process. By changing the temperature parameters of the nonlinear optical elements, the system can control the laser output energy level, allowing high precision temperature tuning to be performed with high drive current while maintaining safety
2Measurement precision
If high drive current is used during temperature tuning to increase the range of output change, then high precision temperature tuning becomes possible, but high energy laser is outputted, causing damage to the laser irradiation target
Solution Approach 1:
The patent applies preliminary action by pre-setting one temperature controller to a non-optimal temperature before the tuning process. This preliminary configuration suppresses the laser output energy in advance, allowing the system to use high drive current for enhanced tuning precision without causing damage to the irradiation target
Solution Approach 2:
The patent uses the temperature controllers as intermediaries to decouple the drive current level from the actual laser output energy. By introducing temperature control as an intermediate mechanism, the system can independently optimize drive current for precision while using temperature offsets to mediate and suppress the harmful high energy output
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 prevents unnecessary high energy laser irradiation, avoids damage to targets, and increases the range of output and drive current change during temperature tuning, enabling precise temperature control.
Implementation Method 1
a semiconductor laser (1) which generates an excitation laser light
Implementation Method 2
a solid state laser medium (2) which is excited by said excitation laser light and generates a fundamental wave
Implementation Method 3
a solid state laser medium (2) which is excited by said excitation laser light and generates a fundamental wave
Implementation Method 4
a second harmonic generating element (4) for generating a second harmonic of the fundamental wave generated in said optical resonator (20)
Implementation Method 5
a third harmonic generating element (5) for generating a third harmonic of the fundamental wave generated in said optical resonator (20)
Data Source
AI summary
During temperature tuning, first, the temperature of a third harmonic generating element is swept to determine the optimal temperature Ttp of the third harmonic generating element in a state where the temperature of a second harmonic generating element has been set to a temperature shifted away from the vicinity of the optimal temperature. Next, the temperature of second harmonic generating element is swept to determine the optimal temperature Tsp of the second harmonic generating element in a state where the temperature of the third harmonic generating element has been set to a temperature shifted away from the vicinity of the optimal temperature.