Session Index

An efficient dual-wavelength CW mid-infrared laser is demonstrated using an intracavity optical parametric oscillator (OPO). By using the dual-wavelength pump wave from a composite Nd:YVO4/Nd:GdVO4 gain medium, the quasi-phase-matched (QPM) OPO process is found to have shared resonance at signal wave share for reducing threshold power.

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We have demonstrated a compact and cost-effective ytterbium-doped all-fiber laser operating at 976 nm. By utilizing a commercially available ytterbium-doped fiber with a length of only 18 cm, we achieved a lasing power of 10.3 W, with a slope efficiency of 25.4%. To our knowledge, our work presents the shortest gain fiber ever documented in the literature capable of delivering tens-of-watt 976-nm lasing power. The design is compatible with conventional fiber components, simplifying the monolithic assembly process. Notably, the incorporation of such a short gain fiber obviated the need for additional measures to suppress the strong 1.03-μm emission.

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A hybrid system is proposed in this study, which combines optical injection and optoelectronic feedback to generate a square-wave signal while analyzing the relationship between the delay time of modulation and the frequency and waveform. In addition, the impact of frequency peak density on the flatness of the square waveform is investigated. This research provides a new option for existing square-wave signal generation techniques and has the opportunity to reduce the cost and complexity of future signal generation and electronic equipment.

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Focusing the laser pulse into a capillary filled with neon gas for interaction, and generating phase-matched HHG in the water window by balancing plasma dispersion with dipole phase. The result of using ANSYS to simulate the flow field in the capillary show that this design can achieve the gas density distribution required for the experiment.

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An LED-side-pumped Nd: YAG/Cr4+: YAG passively Q-switched (PQS) laser containing an extracavity optical parametric oscillator (EOPO) is demonstrated. The PQS pulse energy is optimized to 24 mJ at 1064 nm. By using the double-pass EOPO operation, the pump-to-signal conversion efficiency increases to 45.8%, the output energy of the signal pulse is up to 10.98 mJ with a pulse width of 23.5ns, and the peak power is 459kW. This study demonstrates the possibility of using LED-pumped eye-safe lasers to achieve low-cost, long-range flash LiDAR systems.

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A new mode-locked fiber laser configuration based on a silicon-photonics micro- ring cascaded with an electro-absorption-modulator is carefully examined. We experimentally demonstrate both active and passive mode-locking operation in the same configuration. The distinctive features of the laser are the highly stable pulse train and the wide coherent optical comb spectrum.

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We optimized the waveguide structure of two types of InGaN-based photonic crystal surface-emitting laser (PCSEL) via optical mode simulation. In order to minimize threshold materials gain (gth), we calculated the confinement factor and quality factor of PCSEL with varying waveguide layer thicknesses in the separate confinement heterostructure (SCH). Optimal mode intensity profile revealed the coupling between the fundamental mode of SCH and parasitic leaky modes in the cladding layer or substrate as the main root cause of a low quality factor. With an optimized thickness design, gth of PCSEL with air voids in the n-side could be below 2000 cm-1.

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In this paper, chaotic pulses are generated in semiconductor lasers subjected to both optoelectronic feedback and optical injection by numerical simulation. The detuning frequency between the two semiconductor lasers is the key factor to generate chaotic pulses. The chaotic pulses generated show the broad bandwidths of around 38 GHz and the magnitude drops are effectively reduced in frequency domain compared to the semiconductor laser only applying optoelectronic feedback loop.

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We investigated the random lasing characteristics of cesium lead bromide quantum dots (CsPbBr3 QDs) on patterned silk fibroin (SF) films. The patterned SF film was produced from nanocasting of rose-petal. By applying mechanical stress on the flexible PET substrate, the flexible RL was demonstrated with a 7.7 nm blue-shift relative to the flat CsPbBr3 QDs/SF film.

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The most common approach to investigate the pulse width of an ultrafast laser is through autocorrelation by either two-photon absorption (TPA) or second-harmonic generation (SHG). However, in comparison, SHG-based measurements are more inconvenient as they require a phase-matching condition and may necessitate a sensitive detector. Conversely, TPA-based measurements are simpler and more cost-effective, utilizing only a photodiode or light-emitting diode (LED). Our study employs an ultraviolet (UV) photodiode to generate the TPA signal and directly harvests the corresponding current through a source meter—eliminating the need for amplifiers, oscilloscopes, or data acquisition systems (DAS).

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At high power, stimulated Raman scattering competes with stimulated polariton scattering to saturate the THz-radiation output from a THz parametric source. We demonstrated the generation of ultra-high-power narrow-line THz radiation from KTP by suppressing the stimulated Raman scattering, achieving 17.2-μJ pulse energy over an ~80-ps pulse width at 5.7 THz.

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A narrow-linewidth DFBLD with the <±0.0001°C feedback control exhibits an ultra-long-term wavelength stability of <0.1pm for secure BPSK encryption and decryption. The delay-interferometric decoding the BPSK security code with a bit-amplitude fluctuation of <0.5% is demonstrated to enable an error-free BER of <8.6×10^-10.


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The development of compact, efficient and high quality postcompression schemes for laser pulses of relatively low μJ-level energies is of particular interest for MHz high-repetition rate fiber lasers. Here, we demonstrated the use of an all-solid-state medium within a Herriott-type multi-pass cell to postcompress 3 uJ femtosecond pulses from 172 fs to 47 fs with an efficiency of 72%.

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