Publicación: ANOMALOUS SECOND HARMONIC GENERATION OF TWISTED GAUSSIAN SCHELL MODEL BEAMS
Fecha
2024
Autores
Título de la revista
ISSN de la revista
Título del volumen
Editor
OPTICS AND LASER TECHNOLOGY
Resumen
WE INVESTIGATE THEORETICALLY AND EXPERIMENTALLY THE OPTICAL SECOND HARMONIC GENERATION (SHG) WITH A TWISTED GAUSSIAN SCHELL MODEL (TGSM) BEAM AS THE FUNDAMENTAL FIELD. WE USE TYPE-II PHASE MATCHING AND ANALYZE THE CROSS SPECTRAL DENSITY (CSD) OF THE SHG OUTPUT BEAM WHEN THE INPUT FUNDAMENTAL IS PREPARED WITH A TGSM STRUCTURE. WE ANALYZE TWO SYNTHETIZATION METHODS FOR PREPARING THE TGSM FUNDAMENTAL BEAM AND WE FIND THAT FOR ONE METHOD THE SHG IS ALSO A TGSM BEAM. FOR THE OTHER METHOD, WE FIND THAT THE SHG IS NOT A TGSM BEAM AND PRESENTS AN ANOMALOUS CSD POSSESSING A DIP INSTEAD OF A PEAK IN THE TRANSVERSE SPATIAL STRUCTURE. MOREOVER, WE SHOW THAT THE DIP DEPTH IS DIRECTLY RELATED TO THE TWISTED PHASE PARAMETER, BEING ABSENT FOR A NON TWISTED GSM BEAM. OUR RESULTS SHOW THAT THE SHG FROM A FUNDAMENTAL TGSM BEAM CAN RESULT IN A DOUBLED FREQUENCY TGSM OR IN A NON-TGSM BEAM DEPENDING ON THE SYNTHETIZATION METHOD.
Descripción
Palabras clave
Twisted Gaussian Schell model beams, Second harmonic generation
