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

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

Abstract

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 .

Keywords

nelinearna optika;ultrakratki laserski pulzi;FROG;karakterizacija ultrakratkih laserskih pulzov;nonlinear optics;ultrashort pulse;ultrashort pulse characterization;

Data

Language:	English
Year of publishing:	2020
Typology:	1.01 - Original Scientific Article
Organization:	UL FS - Faculty of Mechanical Engineering
UDC:	535.18(045)
COBISS:	17035547
ISSN:	0018-9197
Views:	105
Downloads:	32
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	Slovenian
Secondary keywords:	nelinearna optika;ultrakratki laserski pulzi;FROG;karakterizacija ultrakratkih laserskih pulzov;
Type (COBISS):	Article
Pages:	str. 1-8
Volume:	ǂVol. ǂ56
Issue:	ǂno. ǂ2
Chronology:	2020
DOI:	10.1109/JQE.2020.2971761
ID:	15882621