Cascade Raman Laser Blocking Device for Stokes Ray Isolation
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Solution Overview
Problem
Conventional cascade Raman lasers experience a decrease in output when the output of semiconductor pumping lasers is increased, due to the leakage of Stokes rays back into the pumping laser source, leading to inefficient Raman amplification and power reduction.
Innovation Solution
A blocking device is interposed between the pumping laser source and the cascade Raman resonator to block the first Stokes ray from entering the pumping laser source, preventing Raman amplification within the pumping laser and maintaining high output power by selectively reflecting specific wavelengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the output of semiconductor pumping lasers is increased to enhance power output, then the Raman amplification should be improved, but the output actually decreases due to Stokes ray leakage back into the pumping laser source
Solution Approach 1:
An optical isolator is introduced as an intermediary component between the pumping laser source and the Raman optical fiber. This isolator allows the pumping light to pass through to the Raman fiber while blocking the backward-propagating Stokes rays from entering the pumping laser source, thus preventing Raman amplification within the pumping laser and maintaining stable high power output
2Device complexity
If Stokes rays are allowed to propagate back into the pumping laser source, then the system structure remains simple, but Raman amplification occurs within the pumping laser leading to power reduction
Solution Approach 1:
An optical isolator is introduced as an intermediary component between the pumping laser source and the Raman optical fiber. This isolator allows the pumping light to pass through to the Raman fiber while blocking the backward-propagating Stokes rays from entering the pumping laser source, thus preventing Raman amplification within the pumping laser and maintaining stable high power 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
The blocking device effectively prevents the decrease in output power by ensuring that the Raman amplification occurs within the resonator, allowing for increased power output of the cascade Raman laser as the semiconductor pumping lasers' output is enhanced.
Implementation Method 1
a Raman optical fiber that is connected to the input-side optical reflector and generates Raman scattering light at least by the pumping light
Implementation Method 2
an input-side optical reflector that receives the pumping light and selectively reflects light of each wavelength corresponding a n-th Stokes ray (n is an integer more than 1) of Raman scattering to the pumping light
Data Source
AI summary
The invention provides a cascade Raman laser including a pumping laser light source that generates pumping light, a cascade Raman resonator having an input-side optical reflector that receives the pumping light and selectively reflects light of each wavelength corresponding to a n-th Stokes ray (n is an integer more than 1) of Raman scattering to the pumping light, a Raman optical fiber that is connected to the input-side optical reflector and generates Raman scattering light at least by the pumping light and an output-side optical reflector that is connected to the Raman optical fiber and selectively reflects light of each wavelength corresponding to the n-th Stokes ray and a blocking device interposed between the pumping laser light source and the cascade Raman resonator and blocks the first Stokes ray generated within the cascade Raman resonator from entering the pumping laser light source side.