Study and Simulate Fine Structures Solid State Lasers Using Object Oriented Programming
| Main Authors: | Bashir Ahmed Malik, Pro. Dr.Qurban Ali Bhatti, Dr.Mumtaz Hussain Mahar |
|---|---|
| Format: | Article eJournal |
| Bahasa: | eng |
| Terbitan: |
, 2017
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| Subjects: | |
| Online Access: |
https://zenodo.org/record/3534922 |
Daftar Isi:
- This week is based on high resolution laser spectroscopic investigation of La I and La II free atoms. We have employed laser induced florescene / Optogalovanic technique using the liquid nitrogen cooled hollow cathode of natural Lanthanum in connection with a frequiency stabilized ring dye laser. Laser dyes Coumarin 102 and Coumarin 30 were used as the active medium in the optical blue and green region (4700- 5300A) pumped by multiline ultra-voilet (337.5-356.4mm) of Kr-ion and Rhodamine 700 (LD700) pumped by multiline red (647.1-676.4mm) out put of Kr-ion laser. These optical regions were explored extensively for the first time in the present work in order to investigate the magnetic dipole coupling constant A and electric quadrupole coupling constant B. For relative frequency reference and linearization of LIF recorded data a temperature stabilized half meter long Fabry-Perot etalon with free spectral range of 149.724MHz for red region and 149.6MHz for blue and green region was used. A commercial Burleigh wave meter was employed with an accuracy of 0.01A for precise reading of the excitation wavelength. Fourier transform spectra of Lanthanum was also generated in the optical region of 3500 to 8800A in the graphical form while the data was received in digitalized form by a group in Riga (R. Ferber, A. Jarmola, M. Tamanis, Department of Physics, University of Latvia, Raina Bulvaris, Riga), The same was converted in the graphical form at TU Graz before starting the experimental work. In the FT spectra of La I and La II many Lines were unclassified. In case of La I lines some of the involved levels were also unknown and moreover the hyperfine constants of most of the levels were not known before. In case of La II, the A and B constant of most of the levels in the investigated region were already published via other optical regions. At first main emphasis was given to the measurement of hyperfine constants of already known energy levels and those levels were also investigated which were yet unknown. Through a detailed exploration, more than 155 lines of La I and La II were excited in the aforementioned optical regime of laser dyes during this work. Approximately one half of the lines investigated in this study by means of laser exciation were previously unknown La I lines found on the basis of highly resolved Fourier transform (FT) spectra, having a resolution of 0.03 cm-1. The analysis of spectral lines extracted from already recoreded FT spectra using computer programs (Filter and Classification programs) was carried out. Four new levels of La I were discovered and confirmed by the second laser excitation. We have calculated the A and B constant for 99 levels of La I and 28 levels of La II in this work. The data were compared with the already published results of the investigated levels but in different optical regime and found in good agreement within allowed experimental errors. In some cases we observed significant differences in the cited A and B values and our investigated values.