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量子技术研发平台以从事光量子器件的研究和开发为主，包括连续变量非经典光源、高质量的全固态连续单频激光器以及全固态连续单频可调谐激光器的研制与开发。研制的连续变量非经典光源已经提供给包括南京大学、华东师范大学在内的一些高校和科研院所使用。研制的高功率全固态连续单频激光器及可调谐激光器已经提供给包括香港科技大学、中科院物理所、上海光机所、清华大学、南开大学、南京大学、山东大学在内的一些高校和科研院所使用。目前，正在进行百瓦级低噪声激光器、高压缩度及纠缠度的连续变量非经典光源等光量子器件的研制。

最新工作

High-average-power single-frequency pulse optical parametric oscillator based on pulse-integrated seed-injection automatic locking

Authors：Jiaqi Song, Jiliang Qin, Xuechen Cao, Donglin Cheng, Yanan Chen,and Huadong Lu*

Near-infrared nanosecond (ns) single-longitudinal-mode (SLM) pulse light generated from an optical parametri c oscillator (OPO) is an important source in nonlinear optics and high-precision spectral analysis. In this Letter, a sta ble SLM near-infrared ns pulse light source generated from the OPO is presented, which is achieved by developing a seed-injection automatic locking technique based on a pulse integrated photodetector (PIPD). Depending on the PIPD, the peak power of the pulse light detected by the photodi ode is converted to the average power by integrating several pulses. As a result, the detector saturation is thoroughly elim inated, and the interference signal including the resonance point between seed and pulse lights can easily be attained by scanning the resonator length. On this basis, a microcon troller unit (MCU) is employed to realize automatic locking by looking for the minimum value of the interference signal. Finally, a SLM 824 nm pulse light source with an output power of 20.5 W and a linewidth of 51.42 MHz is obtained. The presented method can pave the way to implement a low cost and compact high-average-power SLM pulse OPO.

208 W single-frequency 1064 nm laser based on a single-crystal fiber master-oscillator power amplifier

Authors：Yixiao Wei,Weina Peng, Jiawei Li,Pixian Jin,Jing Su, and Huadong Lu*

High-power all-solid-state continuous-wave (CW) single frequency laser with high linear polarization is a significant source for quantum optics and precision measurement. In this Letter, a high-power linearly polarized CW single frequency laser based on the single-crystal fiber (SCF) master-oscillator power amplifier (MOPA) is presented, in which a homemade 140 W low-noise CW single-frequency laser and a Nd:YAG SCF are firstly employed as the seed laser and the medium of the MOPA, respectively. The mode-matching between the pump laser propagated with waveguide form and the freely propagated seed laser is optimized by considering the influence of the degradations of the polarization and the beam quality. Finally, when the incident powers of the pump and seed lasers are 262.6 W and 126.3 W, respectively, the seed waist radius is optimized to 200 µ m. In this case, the output power of the linearly polarized laser reaches up to 208 W, which is the highest output power, to the best of our knowledge. The presented results provide a good reference for implementing a high power and high degree of the polarization and good beam quality laser based on the SCF MOPA.

A Review of Progress about Birefringent Filter Design and application in Ti sapphire laser

Authors：Jiao Wei, Jing Su, Huadong Lu* ,and Kunchi Peng

All-solid-state tunable lasers have been widely used in many fields including multi-photon microscopy, time-resolved photoluminescence, atomic physics, and so on owing to their broadband output spectrum range, good beam quality, and low noise. To cover the broad fluorescent line of the laser crystal as much as possible, a birefringent filter (BRF) is always the most popular candidate for acting as a tuning element. In this review, the tuning characteristics of BRF and the design rule as well as its progress in practical application are summarized. Especially, it is worth noting that laser crystal itself begins to act as the BRF for wavelength tuning except for its gain characteristic, which has paved a new way for developing a kind of novel tunable laser. We believe that this review will not only provide a valuable reference for the design of BRF but also lay the foundation for developing a new application of BRF.

High-average-power single-longitudinal-mode pulse laser based on a pulse saturation seed-injection locking OPO. Optics Letters

Authors：Jiliang Qin, Jiaqi Song,Xuechen Cao,Donglin Cheng,and Huadong Lu*

A high-average-power and narrow-linewidth nanosecond (ns) pulse 824 nm laser is a crucial source for the generation of deep-ultraviolet (DUV) 248 nm laser by means of the sum frequency process with the 354.5 nm laser. To this purpose, in this Letter, we present a seed-injection-locked high-average power ns pulse single-longitudinal-mode (SLM) 824 nm laser. By developing a novel, to the best of our knowledge, pulse-saturated seed-injection locking method, disturbance of the pulse laser on the locking of the injected seed laser is successfully eliminated. As a result, the output power of 824 nm laser is up to 21.2 W at the incident pump power of 48.1 W, and the pulse width is 15 ns. Especially, the signal-to-noise ratio of the detected modulated sideband signal exceeds 28 dB, which ensures that the achieved linewidth of the 824 nm laser is as narrow as 38.8 MHz. These results demonstrate the potential of the proposed pulse saturation seed-injection locking OPO cavity for high-power and narrow-linewidth laser applications.