Abstract
In this paper, passive mode-locking in Ti:sapphire laser with a coherent absorber cells with rubidium vapor placed in the cavity is demonstrated experimentally. For the best of our knowledge these experiments are the first time experimental demonstration of passive mode-locking based on self-induced transparency regime in the coherent absorber. Up to now, such a regime has not been observed experimentally and was predicted only theoretically.
Highlights
Passive mode-locking (PML) in lasers occurs when an absorbing medium having a nonlinear dependence of the transmission on the intensity is placed in the laser cavity [1]
Passive mode-locking in Ti:sapphire laser with a coherent absorber cells with rubidium vapor placed in the cavity is demonstrated experimentally
We report the peculiarities of experimental demonstration of self-induced transparency (SIT) based mode-locking in Ti:sapphire laser with rubidium absorbing cell placed in the cavity, which arises only due to SIT in rubidium vapor
Summary
Passive mode-locking (PML) in lasers occurs when an absorbing medium having a nonlinear dependence of the transmission on the intensity is placed in the laser cavity [1]. If the absorber operates in the regime of coherent light-matter interactions (pulse duration is shorter than T2) the relaxation times of the medium will not impose restrictions on the duration of the generation pulse, which can reach the value in one cycle of light oscillations [2]. In this case, the so-called 2π pulse of the self-induced transparency (SIT) can occur in the laser cavity when pulse propagates in the absorber without losses as 2π pulse [3]. In the situation when mode-locking arises in the laser with a coherent absorber (gain medium remains in the incoherent regime) due to SIT phenomenon was studied theoretically in [7]
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