pulse formation
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2021 ◽  
Vol 2140 (1) ◽  
pp. 012008
Author(s):  
E V Balzovsky ◽  
P M Lysykh

Abstract A technique for the formation of ultra-wideband bipolar pulses using two synchronized generators of monopolar pulses of different polarities and a broadband ring summing unit is considered. In contrast to the traditional circuit on short-circuited segments of line, the proposed approach allows varying the duration of bipolar pulses by changing the time delay between the generators


Molecules ◽  
2021 ◽  
Vol 26 (11) ◽  
pp. 3460
Author(s):  
Jingcheng Shang ◽  
Yizhou Liu ◽  
Shengzhi Zhao ◽  
Yuefeng Zhao ◽  
Yuzhi Song ◽  
...  

We experimentally investigate the formation of various pulses from a thulium–holmium (Tm–Ho)-codoped nonlinear polarization rotation (NPR) mode-locking fiber oscillator. The ultrafast fiber oscillator can simultaneously operate in the noise-like and soliton mode-locking regimes with two different emission wavelengths located around 1947 and 2010 nm, which are believed to be induced from the laser transition of Tm3+ and Ho3+ ions respectively. When the noise-like pulse (NLP) and soliton pulse (SP) co-exist inside the laser oscillator, a maximum output power of 295 mW is achieved with a pulse repetition rate of 19.85-MHz, corresponding to a total single pulse energy of 14.86 nJ. By adjusting the wave plates, the fiber oscillator could also deliver the dual-NLPs or dual-SPs at dual wavelengths, or single NLP and single SP at one wavelength. The highest 61-order harmonic soliton pulse and 33.4-nJ-NLP are also realized respectively with proper design of the fiber cavity.


2021 ◽  
Author(s):  
Matthew Majewski ◽  
Maria Pawliszewska ◽  
Stuart Jackson

2021 ◽  
Author(s):  
Su-Peng Yu ◽  
Daniel C. Cole ◽  
Hojoong Jung ◽  
Gregory T. Moille ◽  
Kartik Srinivasan ◽  
...  

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Rostislav Arkhipov ◽  
Anton Pakhomov ◽  
Mikhail Arkhipov ◽  
Ihar Babushkin ◽  
Nikolay Rosanov

AbstractHere we consider coherent mode-locking (CML) regimes in single-section cavity lasers, taking place for pulse durations less than atomic population and phase relaxation times, which arise due to coherent Rabi oscillations of the atomic inversion. Typically, CML is introduced for lasers with two sections, the gain and absorber ones. Here we show that, for certain combination of the cavity length and relaxation parameters, a very stable CML in a laser, containing only gain section, may arise. The mode-locking is unconditionally self-starting and appears due to balance of intra-pulse de-excitation and slow interpulse-scale pump-induced relaxation processes. We also discuss the scaling of the system to shorter pulse durations, showing a possibility of mode-locking for few-cycle pulses.


2021 ◽  
pp. 126747
Author(s):  
Sheida Mahmoodi ◽  
Christoph Bacher ◽  
Alexander Heidt ◽  
Christoph Lätt ◽  
Daryoush Abdollahpour ◽  
...  

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