Frequency-Doubling of Femtosecond Pulses in “Thick” Nonlinear Crystals With Different Temporal and Spatial Walk-Off Parameters
We present a comparative study on frequency-doubling characteristics of femtosecond laser pulses in thick nonlinear crystals with different temporal and spatial walk-off parameters. Using single-pass second harmonic generation (SHG) of 260 fs pulses at 1064 nm from a high-average-power femtosecond Y...
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2016-01-01
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| Series: | IEEE Photonics Journal |
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| Online Access: | https://ieeexplore.ieee.org/document/7738466/ |
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| author | N. Apurv Chaitanya A. Aadhi S. Chaitanya Kumar M. V. Jabir G. K. Samanta M. Ebrahim-Zadeh |
| author_facet | N. Apurv Chaitanya A. Aadhi S. Chaitanya Kumar M. V. Jabir G. K. Samanta M. Ebrahim-Zadeh |
| author_sort | N. Apurv Chaitanya |
| collection | DOAJ |
| description | We present a comparative study on frequency-doubling characteristics of femtosecond laser pulses in thick nonlinear crystals with different temporal and spatial walk-off parameters. Using single-pass second harmonic generation (SHG) of 260 fs pulses at 1064 nm from a high-average-power femtosecond Yb-fiber laser in 5-mm-long crystals of β-BaB <sub>2</sub>O<sub>4</sub> (BBO) and BiB<sub>3</sub>O<sub>6</sub> (BIBO), we find that for comparable values of temporal and spatial walk-off parameters in each crystal, the optimum focusing condition for SHG is more strongly influenced by spatial walk-off than temporal walk-off. It is also observed that under such conditions, the Boyd and Kleinman theory commonly used to define the optimum focusing condition for frequency-doubling of cw and long-pulse lasers is also valid for SHG of ultrafast lasers. We also investigate the effect of focusing on the spectral, temporal, and spatial characteristics of the second harmonic (SH) radiation, as well as angular acceptance bandwidth for the SHG process, under different temporal and spatial walk-off conditions in the two crystals. |
| format | Article |
| id | doaj-art-b6a94ffb32d744bdb3abcecaa17ef1e6 |
| institution | Kabale University |
| issn | 1943-0655 |
| language | English |
| publishDate | 2016-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Photonics Journal |
| spelling | doaj-art-b6a94ffb32d744bdb3abcecaa17ef1e62025-08-20T03:32:46ZengIEEEIEEE Photonics Journal1943-06552016-01-018611310.1109/JPHOT.2016.26261987738466Frequency-Doubling of Femtosecond Pulses in “Thick” Nonlinear Crystals With Different Temporal and Spatial Walk-Off ParametersN. Apurv Chaitanya0A. Aadhi1S. Chaitanya Kumar2M. V. Jabir3G. K. Samanta4M. Ebrahim-Zadeh5Photonic Sciences Laboratory, Physical Research Laboratory, Navarangpura, Ahmedabad, Gujarat, IndiaPhotonic Sciences Laboratory, Physical Research Laboratory, Navarangpura, Ahmedabad, Gujarat, IndiaICFO-Institut de Ciencies Fotoniques, Castelldefels, Barcelona, SpainPhotonic Sciences Laboratory, Physical Research Laboratory, Navarangpura, Ahmedabad, Gujarat, IndiaPhotonic Sciences Laboratory, Physical Research Laboratory, Navarangpura, Ahmedabad, Gujarat, IndiaICFO-Institut de Ciencies Fotoniques, Castelldefels, Barcelona, SpainWe present a comparative study on frequency-doubling characteristics of femtosecond laser pulses in thick nonlinear crystals with different temporal and spatial walk-off parameters. Using single-pass second harmonic generation (SHG) of 260 fs pulses at 1064 nm from a high-average-power femtosecond Yb-fiber laser in 5-mm-long crystals of β-BaB <sub>2</sub>O<sub>4</sub> (BBO) and BiB<sub>3</sub>O<sub>6</sub> (BIBO), we find that for comparable values of temporal and spatial walk-off parameters in each crystal, the optimum focusing condition for SHG is more strongly influenced by spatial walk-off than temporal walk-off. It is also observed that under such conditions, the Boyd and Kleinman theory commonly used to define the optimum focusing condition for frequency-doubling of cw and long-pulse lasers is also valid for SHG of ultrafast lasers. We also investigate the effect of focusing on the spectral, temporal, and spatial characteristics of the second harmonic (SH) radiation, as well as angular acceptance bandwidth for the SHG process, under different temporal and spatial walk-off conditions in the two crystals.https://ieeexplore.ieee.org/document/7738466/Harmonic generation and mixingnonlinear opticsmaterialsultrafast lasersfiber lasersupconversion |
| spellingShingle | N. Apurv Chaitanya A. Aadhi S. Chaitanya Kumar M. V. Jabir G. K. Samanta M. Ebrahim-Zadeh Frequency-Doubling of Femtosecond Pulses in “Thick” Nonlinear Crystals With Different Temporal and Spatial Walk-Off Parameters IEEE Photonics Journal Harmonic generation and mixing nonlinear optics materials ultrafast lasers fiber lasers upconversion |
| title | Frequency-Doubling of Femtosecond Pulses in “Thick” Nonlinear Crystals With Different Temporal and Spatial Walk-Off Parameters |
| title_full | Frequency-Doubling of Femtosecond Pulses in “Thick” Nonlinear Crystals With Different Temporal and Spatial Walk-Off Parameters |
| title_fullStr | Frequency-Doubling of Femtosecond Pulses in “Thick” Nonlinear Crystals With Different Temporal and Spatial Walk-Off Parameters |
| title_full_unstemmed | Frequency-Doubling of Femtosecond Pulses in “Thick” Nonlinear Crystals With Different Temporal and Spatial Walk-Off Parameters |
| title_short | Frequency-Doubling of Femtosecond Pulses in “Thick” Nonlinear Crystals With Different Temporal and Spatial Walk-Off Parameters |
| title_sort | frequency doubling of femtosecond pulses in thick nonlinear crystals with different temporal and spatial walk off parameters |
| topic | Harmonic generation and mixing nonlinear optics materials ultrafast lasers fiber lasers upconversion |
| url | https://ieeexplore.ieee.org/document/7738466/ |
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