We report on a high-power passively mode-locked TEM(00)Nd:YVO(4) oscillator, 888 nm diode-pumped, with pulse durations adjustable between 46 ps and 12 ps. The duration tunability was obtained by varying the output coupler (OC) transmission while avoiding resorting to spatial hole burning (SHB) for pulse shortening. At a repetition rate of 91 MHz and for an output power ranging from 15 Wto45 W, we produced SHB-free 12-ps-to32-ps-long pulses. Within this range of power, these are the shortest pulse durations obtained directly from Nd:YVO(4) oscillators.
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http://dx.doi.org/10.1364/OL.35.001644 | DOI Listing |
Nanomaterials (Basel)
January 2025
School of Physics and Optoelectronic Engineering, Beijing University of Technology, Beijing 100124, China.
This paper investigates the thermal effects in fused-tapered passive optical fibers under near-infrared absorption. The thermal effect is primarily caused by impurities, such as OH-, which absorb incident light and generate heat. Using the finite element method, the volume changes during fiber tapering were simulated, influencing power density and thermal distribution.
View Article and Find Full Text PDFSensors (Basel)
December 2024
Hangzhou Institute of Technology, Xidian University, Hangzhou 311200, China.
A highly sensitive sulfur dioxide (SO) photoacoustic gas sensor was developed for the sulfur hexafluoride (SF) decomposition detection in electric power systems by using a novel 266 nm low-cost high-power solid-state pulse laser and a high -factor differential photoacoustic cell. The ultraviolet (UV) pulse laser is based on a passive -switching technology with a high output power of 28 mW. The photoacoustic signal was normalized to the laser power to solve the fluctuation of the photoacoustic signal due to the power instability of the UV laser.
View Article and Find Full Text PDFSensors (Basel)
November 2024
Engineering and Design Department, Western Washington University, Bellingham, WA 98225, USA.
Autism spectrum disorder (ASD) is a chronic neurological disorder with the severity directly linked to the diagnosis age. The severity can be reduced if diagnosis and intervention are early (age < 2 years). This work presents a novel ear-worn wearable EEG system designed to aid in the early detection of ASD.
View Article and Find Full Text PDFWe have proposed and demonstrated the generation of a high-repetition-rate ultrashort pulse with long-term stability and low noise based on a harmonic mode-locked (HML) figure-9 fiber laser. Different HML orders from the 2nd to the 13th are generated by adjusting the pump power, net dispersion, and wave plate angles. A 2-GHz HML pulse is obtained with a 155-MHz fundamental repetition rate in a Yb-doped fiber laser, and the corresponding supermode suppression level is as high as 50 dB.
View Article and Find Full Text PDFACS Appl Mater Interfaces
November 2024
Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China.
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