Crystal-configuration considerations for higher-sensitivity picosecond-pulse SHG FROG

Šušnjar, Peter (author), Jones, Travis (author), Trebino, Rick (author), Petkovšek, Rok (author)

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 .

• Language: English
• Keywords: nonlinear optics, ultrashort pulse, FROG, ultrashort pulse characterization
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FS - Faculty of Mechanical Engineering
• Publication status: Published
• Publication version: Version of Record
• Publication date: 05.02.2020
• Year: 2020
• Number of pages: 8 str.
• Numbering: Vol. 56, no. 2
• PID: 20.500.12556/RUL-138106
• UDC: 535.18(045)
• ISSN on article: 0018-9197
• DOI: 10.1109/JQE.2020.2971761
• COBISS.SI-ID: 17035547
• Publication date in RUL: 11.07.2022

Record is a part of a journal

• Title: IEEE journal of quantum electronics
• Shortened title: IEEE j. quantum electron.
• Publisher: Institute of Electrical and Electronics Engineers
• ISSN: 0018-9197
• COBISS.SI-ID: 8561925

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
• Licensing start date: 05.02.2020

Secondary language

• Language: Slovenian
• Keywords: nelinearna optika, ultrakratki laserski pulzi, FROG, karakterizacija ultrakratkih laserskih pulzov