CC BY
6The 30th International Conference on Advanced Laser Technologies
ALT'23
LS-P-13
Comparison compression methods of a strongly chirped signal from a pulsed Yb-doped fiber laser by diffraction gratings and CFBG
compressors
I. Zhluktova1, R. Okun1, A. Kamynin1, A. Wolf2, V. Tsvetkov1
1-Prokhorov General Physics Institute of Russian Academy of Sciences, Moscow 119991, Russia 2- Institute of Automation and Electrometry of the Siberian Branch of the RAS, Novosibirsk, 630090, Russia
Main author email address: [email protected]
Pulse compression is necessary for high energy and ultra-short pulse (USP) generation, which has applications in various fields of science and technology, such as attosecond science [1], ultrafast spectroscopy [2], and terahertz generation [3]. Various compression methods are used to achieve shorter pulse durations. One such pulse compression method is the use of a diffraction grating or chirped fiber Bragg grating (CFBG). In this paper, we investigated the compression of a strongly frequency-modulated (chirped) amplified pulse from a ytterbium (Yb) doped fiber laser (MO) operating in a passive mode-locked regime. For this purpose, two different compressors were assembled to evaluate how compression of such complex pulses would occur. First, a Tracy compressor (TC) based on holographic diffraction gratings was assembled (recorded in Bayfol HX 200 photopolymer). The average MO output power after amplification in the Yb-doped fiber amplifier was 140 mW, after compression - 0.4 mW. This was enough to register autocorrelation traces (ACT), shown in Fig.l.a. Evaluating the ACT, we can see that a highly chirped pulse after the compressor produces compressed pulses with durations of less than 5 ps (approximated using the sechA2 form). The pulse also has wings, showing uncompressed higher order dispersion terms.
1 i
S3
C3
§ 0.001-
1E-4-
1E-5
1040
- compress TC|
1060
1080
1100
Wavelength, nm
1120
- compress CFBG
1E-4-
1040
1060
1080
1100
1120
Wavelength, nm
Fig. 1. Pulse spectra after different compressors: a) after TC, b) after CFBG. The inserts in the figures are ACTs with a resolution of 0.3 ps.
In another case, a compressor based on CFBG (provided by IA&E SB RAS) was used. By using such a CFBG compressor, a pulse with a high uncompressed substrate was achieved. The output power was 17 mW at maximum amplifier pump power. Furthermore, a coherent structure of compressed pulses consisting of several pulses with a duration of less than 5 ps and a distance between them of about 35 ps was recorded, as shown in Fig. 1.b.
This research was funded with the financial support of the Ministry of Science and Higher Education of the Russian Federation, grant number 075-15-2022-315, and carried out on the basis of the World-Class Research Center «Photonics».
[1] F. Krausz and M. Ivanov, Attosecond physics, Rev. Mod. Phys. 81(1), 163-234 (2009)
[2] R. Berera, R. van Grondelle, and J. T. M. Kennis, Ultrafast transient absorption spectroscopy: principles and application to photosynthetic systems, Photosynth. Res. 101(2-3), 105-118 (2009).
[3] R. Piccoli, A. Rovere, Y.-G. Jeong, Yu. Jia, L. Zanotto, F. Legare, B. E. Schmidt, R. Morandotti, and L. Razzari, Extremely broadband terahertz generation via pulse compression of an Ytterbium laser amplifier, Opt. Express 27, 32659-32665 (2019)
