Control of laser radiation parameters

Evolution of the shape and spectrum of ultrashort pulses upon active mode locking

V. A. Zaporozhchenko

B. I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, Minsk

Abstract: Time sweeps of the autocorrelation function and the emission spectrum of an actively mode-locked Nd:YAG laser are recorded during the development of quasi-continuous pre-lasing maintained by a negative feedback loop. It is found that higher Hermitian–Gaussian supermodes are present at the transient stage of radiation, and the ultrashort pulse shortening is accompanied by the shift of the lasing spectrum to the red wing of the gain band of the active medium.

PACS: 42.55.Rz, 42.60.Fc

Received: 18.12.2002
Revised: 18.03.2003

 English version: Quantum Electronics, 2003, 33:11, 1009–1014

Bibliographic databases:

•