Abstract
A tunable pulsed dual-wavelength laser is presented based on an Nd:YVO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">4</sub> /Nd:GdVO <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">4</sup> combined crystals pair as amplifying medium. By employing pulse width adjustment of an 808 nm laser diode pumping, and a Cr <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">4+</sup> :YAG crystal for Q-switching, synchronized dual-wavelength laser pulses were obtained at 1063 nm and 1064 nm. Time jitter between the two wavelength pulses is reduced to about 10% of the laser pulse duration. Adjusting the pump beam operation parameters and tuning the crystals pair steady-state temperature between 10 °C and 50 °C, the frequency separation between the dual-wavelength laser pulses gradually decreases from 344.11 GHz to 305.99 GHz. The relative peak powers and the pulses time synchronization remain stable during their frequency separation tuning.
Highlights
In the past a few years, the dual-wavelength lasers have shown great potentials in the applications of optical radio frequency (RF) to terahertz (THz) wave generation, Doppler lidar in coherent detection, spectroscopic study and so on [1]–[14]
The output dual-wavelength laser signals split by a wedge plate into two parts, one part feeds to a high-resolution optical spectrum analyzer (OSA, AQ6370B, Yokogawa Electric Co., Ltd.) to monitor the frequency separations, the other part is polarization-split into two beams through a polarization beam splitter (PBS) and feed to two silicon detectors (DET10A2) to monitor the pulse time jittering
The pulse widths are about 200 ns. It is found around 24 KHz pulse repetition frequency, when the passive Q-switched pulse is of 1063 nm and the self-triggered pulse is of 1064 nm, the dual-wavelength laser pulses obtain higher peak powers and better balanced peak power distribution
Summary
Yizhi Ke, Miao Hu , Mengmeng Xu, Mengying Xia, Huimin Zhou, Qiliang Li , Xuefang Zhou , Guowei Yang , and Meihua Bi College of Communication Engineering, Hangzhou Dianzi University, Hangzhou 310018, China DOI:10.1109/JPHOT.2021.3054838 This work is licensed under a Creative Commons Attribution 4.0 License. For more information, see https://creativecommons.org/licenses/by/4.0/
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
