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SHG-CW-G-Fields-Ideal

Term	Definition
SHG	Second Harmonic Generation
CW	Continuous Wave
G	Gaussian

 

Article title:
Temperature increase effects on a double-pass cavity type II second-harmonic generation: a model for depleted Gaussian continuous waves

 

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Table of Contents

    1. About this repository

 

    2. Getting Started

 

    3. How to Cite Us

 

    4. Contact Information

 

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1. About this repository

This repository contains the Toolkit for Modeling of Second Harmonic Electric-Field Distribution in KTP Crystal: Continuous-Wave Gaussian Second Harmonic Generation, an open-source toolkit for investigating the effect of temperature increase on the efficiency of second-harmonic generation (SHG) processes.

The toolkit implements a comprehensive depleted wave model that describes the continuous-wave SHG process with fundamental Gaussian waves in a double-pass cavity type II configuration. The model solves six coupled equations to generate the second harmonic of a Gaussian fundamental wave, accounting for fundamental beam depletion rather than using the conventional non-depleted assumption.

The toolkit models the critical effect of temperature increase in the nonlinear crystal due to optical absorption by incorporating mismatched phase arising from changes in refractive indices into the coupled equations. This approach enables the investigation of how SHG efficiency decreases when the crystal temperature increases by 5, 10, and 15 K, revealing dramatic reductions in efficiency due to small temperature changes.

The implementation features a homemade code written in Intel Fortran with compiled kernels, built-in benchmark reporting, and reproducible pipelines. The toolkit generates comprehensive datasets with spatiotemporal field distributions and efficiency analyses, showing excellent agreement with experimental data. This toolkit was used to solve the modeling problem described in the research article "Temperature increase effects on a double-pass cavity type II second-harmonic generation: a model for depleted Gaussian continuous waves".

Folder PATH listing
+---citation                    <-- Contains research papers and citations
│       1_Heat-Equation_Cont…   <-- Heat equation analytical solutions
│       2_Heat-Equation_Cont…   <-- Heat equation continuous wave
│       3_Heat-Equation_Puls…   <-- Heat equation pulsed wave
│       4_Phase-Mismatch_Pul…   <-- Phase mismatch pulsed wave
│       5_Ideal_Continuous-W…   <-- Ideal continuous wave solutions
│       6_Ideal_Pulsed-Wave_…   <-- Ideal pulsed wave Bessel-Gaussian
│       7_Coupled_Continuous…   <-- Coupled continuous wave equations
│       README.md               <-- Citation guidelines and references
│
+---images                      <-- Contains project images and logos
│       SHG-banner.png          <-- Project banner image
│
+---results                     <-- Contains simulation output files
│       elec1-2-3.plt           <-- Combined electric field plots
│       elec1_m-z.plt           <-- Electric field 1 minus z plots
│       elec1_p-z.plt           <-- Electric field 1 plus z plots
│       elec2_m-z.plt           <-- Electric field 2 minus z plots
│       elec2_p-z.plt           <-- Electric field 2 plus z plots
│       elec3_m-z.plt           <-- Electric field 3 minus z plots
│       elec3_p-z.plt           <-- Electric field 3 plus z plots
│
+---src                         <-- Contains source code files
│       Code_SHG-CW-G-Fields…   <-- Main Fortran implementation
│
│       Article_SHG-CW-G-Fie…   <-- Main research article PDF
│       CITATION.cff            <-- Citation metadata file
│       LICENSE                 <-- Project license information
│       README.md               <-- Project documentation

2. Getting Started

2.1. Prerequisites

• Fortran Compiler (gfortran, Intel Fortran, or similar)
• Text Editor (VS Code, Cursor, or any Fortran-capable editor)
• PDF Reader (for accessing research papers)
• Git (for cloning the repository)
• Plotting Software (Gnuplot, Python matplotlib, or similar for visualizing results)

2.2. Quick Start

1. Clone the repository

   git clone https://github.com/Second-Harmonic-Generation/SHG-CW-G-Fields-Ideal.git
   cd SHG-CW-G-Fields-Ideal

2. Explore the Research Papers

   • Navigate to the citation/ folder
   • Read the main research paper: Article_SHG-CW-G-Fields-Ideal.pdf
   • Review additional papers for comprehensive understanding

3. Compile and Run the Toolkit

   cd src
   gfortran -o shg_fields Code_SHG-CW-G-Fields-Ideal.f90
   ./shg_fields

4. Analyze Results

   • Check the results/ folder for output files
   • Examine .plt files for electric field distributions
   • Use plotting software (Gnuplot, Python matplotlib, etc.) to visualize results

5. Run Parameterized Scenarios (Optional)

   • Edit the Fortran source code to change simulation parameters
   • Explore different scenarios:
     • Temperature increases (5, 10, 15 K)
     • Different crystal configurations
     • Various pump powers and beam parameters
   • Recompile and run to compare results with published findings

3. How to Cite Us

Please refer to the citation folder for accurate citations. It contains essential guidelines for accurate referencing, ensuring accurate acknowledgement of our work.

4. Contact Information

For questions not addressed in the resources above, please connect with Mostafa Rezaee on LinkedIn for personalized assistance.