Laser physics and laser optics

Comparison of the laser generation parameters in the coherent and in the standard incoherent passive mode locking regime

R. M. Arkhipov^ab, M. V. Arkhipov^b, O. O. Dyachkova^ab, A. V. Pakhomov^a, N. N. Rosanov<sup>b

a</sup> Saint Petersburg State University, 199034 St. Petersburg, Russia
^b Ioffe Institute, 194021 St. Petersburg, Russia

Abstract: A comparison of the generation efficiency of short pulses with coherent and standard passive (incoherent) mode locking with a saturable absorber is made on the basis of numerical simulations. The advantage of the coherent mode locking in comparison to the standard mode locking in lasers with a saturable absorber is shown. Coherent mode locking in two-section lasers is based on the coherent interaction of the radiation with the absorbing and amplifying media. It allows the generation of ultrashort laser pulses with a duration shorter than the polarisation relaxation time T$_2$ of the absorbing and amplifying media. In conventional lasers with standard (incoherent) passive mode locking with a saturable absorber, the interaction of the laser pulses with the absorbing and amplifying media is incoherent and the duration of the generated pulses is always limited by the polarization relaxation time T$_2$ of the absorber and amplifier.

Keywords: passive mode locking, coherent mode locking, self-induced transparency.

Received: 17.04.2023
Revised: 17.04.2023
Accepted: 10.05.2023

DOI: 10.21883/OS.2023.07.56128.4881-23

Bibliographic databases:

•