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Brief Introduction

The development platform for quantum technology is focused on the research and development of the quantum optics devices, including continuous variable nonclassical light sources, high-quality all-solid-state continious-wave single frequency lasers and all-solid-state continious-wave single frequency tunable lasers. The continuous variable nonclassical light sources have been supplied to Nanjing University, East China Normal University, and so on. The all-solid-state continious-wave single frequency high-power lasers and tunable lasers have been utilized in Hong Kong University of Science and Technology, Institute of Physics, Shanghai Institute of Optics and Fine Mechanics, Tsinghua University, Nankai University, Nanjing University, Shandong University, et al. Nowadays, the platform is concentrated on the development of hundred watts level low-noise lasers, high squeezing degree and entanglement degree continuous variable nonclassical light sources.

Recent research work

Diving angle optimization of BRF in a single-frequency continuous-wave wideband tunable titanium:sapphire laser

Authors:Jiao Wei , XueChen Cao , Pixian Jin ,Jing Su Huadong Lu* ,Kunchi Peng

In this study, the optimal condition of a multi-plate birefringent filter (BRF) used in a single-frequency continuous-wave (CW) tunable laser is theoretically and experimentally investigated. The dependence of the optimal condition on the diving angle of the BRF optical axis is first deduced. Based on the proposed optimal condition, the diving angle of the BRF optical axis is optimized to 29.1 ° . Subsequently, a novel off-axis multi-plate BRF with a thickness ratio of 1:2:5:9 and the thinnest plate of 0.5 mm is designed and utilized in a tunable titanium:sapphire (Ti:S) laser. As a result, the operating wavelength of the Ti:S laser is successfully tuned from 691.48 to 995.55 nm by rotating the BRF 18 ° . The obtained tuning slope efficiency and maximum tuning range are 16.9 nm/ ° and 304.07 nm, respectively. The experimental results agree well with the theoretical analysis results, which provide a feasible approach for designing BRFs to satisfy the requirements of other single-frequency CW wideband tunable lasers.

Realization of a 101 W single-frequency continuous wave all-solid-state 1064 nm laser by means of mode self-reproduction

Authors:Yongrui Guo, Minzhi Xu, Weina Peng, Jing Su, Huadong Lu*, Kunchi Peng

Yongrui Guo, Minzhi Xu, Weina Peng, Jing Su, Huadong Lu*, Kunchi Peng

We realized a 101 W single-frequency continuous wave(CW) all-solid-state 1064 nm laser by means of mode self-reproduction in this Letter. Two identical laser crystals were placed into a resonator to relax the thermal lens of the laser crystals, and an imaging system was employed to realize cavity mode self-reproduced at the places of the laser crystals. Single-frequency operation of the resonator was realized by employing a new kind of high extinction ratio optical diode based on the terbium scandium aluminum garnet crystal to realize a stable unidirectional operation of the laser, together with introducing a large enough nonlinear loss to the resonator to effectively suppress the multi-mode oscillation and mode hopping of the laser. As a result, a 101 W single-frequency 1064 nm laser in a single-ring resonator was achieved with 42.3% optical efficiency. The measured power stability for 8 h and the beam quality were better than ±0.73% and 1.2, respectively.

Influence of the pump scheme on the output power and the intensity noise of a single-frequency continuous-wave laser

Authors:Yongrui Guo , Weina Peng , Jing Su , Huadong Lu* , Kunchi Peng

The influence of the pump scheme on the intensity noise of the single-frequency continuous-wave (CW) laser is investigated in this paper, which is implemented in a single- frequency CW Nd:YVO 4 1064 nm laser by comparing the traditional 808 nm pumping scheme (TPS) to the direct 888 nm pumping scheme (DPS). Under the conditions that the lasers with TPS and DPS have the same cavity structure and the cavity mirrors, as well as the same operation state including the thermal lens of the laser crystals and the mode-matching between the pump laser mode and the laser cavity mode at the laser crystals, the output power of the laser with DPS is up-to 32.0 W, which is far higher than that of 21.1 W for the laser with TPS. However, the intensity noise of the DPS laser including resonant relaxation oscillation (RRO) frequency of 809 kHz, RRO peak amplitude of 31.6 dB/Hz above the shot noise level (SNL) and the SNL cutoff frequency of 4.2 MHz, respectively, is also higher than that of 606 kHz, 20.4 dB/Hz and 2.4 MHz for the TPS laser. After further analyses, we find that the laser crystal with high doping concentration and long optical length is employed for DPS laser in order to improve the pump laser absorption efficiency, which can simultaneously increase the dipole coupling between the active atoms and the laser cavity, and then results in a high RRO frequency with a large amplitude peak as well as a high SNL cutoff frequency of the laser.