Dr. Hongzhi Yang Profile

Dr. Hongzhi Yang

at Qian Xuesen Lab

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Publications (2)

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Proceedings Article | 27 March 2022 Paper

High beam quality and high energy Ho:YLF laser

Jianyong Xue, Lei Wang, Yuan Gao, Ziyue Zhang, Yefei Mao, Hongzhi Yang

Proceedings Volume 12169, 121690V (2022) https://doi.org/10.1117/12.2620751

KEYWORDS: Pulsed laser operation, Crystals, Q switched lasers, Continuous wave operation, Laser energy, Resonators, Solid state lasers, Laser crystals

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The capability of monitoring the greenhouse distribution and variation is of the essence for mankind sustainable development. Differential absorption lidar (DIAL) based on high energy 2 μm pulse lasers are favorable for the atmospheric CO₂ concentration remote sensing. Here we present a high energy Q-switched Ho:YLF laser with a ring cavity resonantly pumped by two self-made 1940 nm Tm:YAP solid-state lasers through polarization beam combining. In the operation of continuous-wave (CW), the maximum output power was 7.39 W at 2065.15 nm as the incident pump power was 33 W, corresponding to a slope efficiency and an optical-to-optical conversion efficiency were 40.75 % and 22.39 %. At 300 Hz, a maximum pulse energy of 21.23 mJ was obtained with the pulse width of 90 ns under 30.8 W pump power. The energy instability during 30 minutes was 1.01 % at the maximum pulse output energy. The beam quality factor M2 were 1.009 in x direction and 1.020 in y direction, respectively. The high energy high stability Ho:YLF laser also makes excellent potential sources for the following amplifiers as well as other applications such as surgery. With the continuing double pulse injection locking, a single frequency high energy pulse laser will be achieved for the CO₂ sensing DIAL.

Proceedings Article | 1 April 2020 Presentation + Paper

Temporal Talbot effect using an intensity-modulating frequency-shifting loop

Hongzhi Yang, Marc Brunel, Marc Vallet, Changming Zhao, Haiyang Zhang, Lei Wang

Proceedings Volume 11354, 113542G (2020) https://doi.org/10.1117/12.2555699

KEYWORDS: Amplitude modulation, Electrooptic modulators

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We investigate an all-fibered frequency-shifting loop (FSL) that includes an electro-optic intensity modulator (EOM) and an optical amplifier, and is seeded by a continuous-wave laser. At variance with frequency-shifted feedback lasers that contain an acousto-optic frequency shifter (AOFS), the EOM creates at each round-trip two side-bands that recirculate inside the loop. We experimentally and theoretically investigate the time response of the FSL in the fractional Talbot condition. Experimental results show that the intensity-modulating FSL generates short pulses with a repetition rate multiplication. We observe pulses at repetition rates tunable between 5.867 MHz and 715.8 MHz. The system is also modeled by a simple linear interference model that takes the amplitude modulation function and loop delay into account. The model predicts the fractional Talbot property as in AOFS-based systems, but with an additional amplitude modulation of the pulse train, in good agreement with the experimental results. This experiment shows an alternative approach to AOFS loops, taking advantage of the inherent bandwidth and tunability of the EOM. This fractional Talbot laser may find applications in optical sampling, THz generation and ultrafast data processing systems.

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