Crystal-configuration considerations for higher-sensitivity picosecond-pulse SHG FROG
| Autor: | Travis Jones, Rick Trebino, Peter Šušnjar, Rok Petkovšek |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
ultrashort pulse characterization
Materials science udc:535.18(045) business.industry Bandwidth (signal processing) Energy conversion efficiency nonlinear optics karakterizacija ultrakratkih laserskih pulzov Condensed Matter Physics Atomic and Molecular Physics and Optics Crystal Wavelength ultrakratki laserski pulzi Picosecond Nonlinear medium Optoelectronics nelinearna optika Electrical and Electronic Engineering BIBO stability business Ultrashort pulse ultrashort pulse FROG |
| Zdroj: | IEEE journal of quantum electronics, vol. 56, no. 2, 2020. |
| ISSN: | 0018-9197 |
| Popis: | We experimentally compare a thick BIBO crystal, a walk-off compensating configuration of thin BBO crystals, and a thin PPLN crystal for the use as a nonlinear medium in SHG FROG, aiming for increased sensitivity required for complete pulse characterization of low-energy (below pJ) pulses a few picoseconds long at wavelengths near 1030 nm. We investigate the dependence of the spectral bandwidth of the frequency-doubled input ultrashort pulse and the conversion efficiency on focal-spot size in the nonlinear crystal. Both numerical and experimental results confirm an increase of the bandwidth with tighter focusing in a thick BIBO and a more-than-threefold increase of conversion efficiency compared to a thin BIBO crystal. A PPLN crystal is found to be the most efficient among the three, but very thin (< 0.3 mm) crystals would be required to extend the measurement capabilities of SHG FROG to sub-ps pulses. A SHG FROG using a PPLN crystal for characterization of picosecond pulse is demonstrated with a sensitivity of 2x10[sup]-3 (mW)[sup]2 . |
| Databáze: | OpenAIRE |
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