In this Letter, we demonstrate a 360 fold spectral bandwidth reduction of femtosecond laser pulses using the method of sum frequency generation of pulses with opposite chirps. The reduction has been achieved in a compact setup in which a single chirped volume Bragg grating replaces conventional stretcher and compressor units. Starting with 180 fs pulses, we have obtained, with a 30% overall efficiency, pulses longer than 100 ps with the spectral bandwidth of 0.23 cm (7 GHz). We also discuss our method on theoretical grounds.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1364/OL.41.002394 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
In this study, we demonstrated a few-cycle pulse generation system delivering an 8-fs and 13-nJ pulse. The oscillator of this system is a mode-locked fiber laser based on a nonlinear amplifying loop mirror (NALM), which is injected into the gain management nonlinear (GMN) amplifier after pre-chirp management by a chirped fiber Bragg grating (CFBG) and a passive fiber. Subsequently, a hollow-core photonic bandgap (HC-PBG) fiber is employed to compensate for the dispersion, achieving a pulse duration of 49.
View Article and Find Full Text PDFDevelopment of an ultrafast laser system based on a Yb-doped fiber and a Yb:YAG thin-rod for the preclinical study of pigmented lesions treatment using a Hartley guinea pig.
Biomed Opt Express
November 2024
Applied Electromagnetic Wave Research Center, Korea Electrotechnology Research Institute (KERI), Ansan 15588, Republic of Korea.
In this research, we developed an ultrafast laser system based on a Yb-doped fiber oscillator and Yb:YAG thin-rod amplifier to investigate the efficacy of the laser for the treatment of pigmented lesions. The developed laser exhibited an output power of 22.7 W, center wavelength of 1030 nm, repetition rate of 495 kHz, pulse energy of 45.
View Article and Find Full Text PDFPredictors of left atrial appendage emptying velocity: Derivation and validation of CHIRP(M) score.
Heart Rhythm
October 2024
Department of Cardiovascular Medicine, The University of Kansas Medical Center, Kansas City, Kansas. Electronic address:
Article Synopsis
- Atrial fibrillation (AF) can weaken the left atrial appendage, increasing the risk of stroke, which can be measured through left atrial appendage emptying velocity (LAAev) via transesophageal echocardiogram (TEE).
- A study evaluated factors that lead to reduced LAAev (<30 cm/s) in patients with AF, using logistic regression to create a risk prediction model called the CHIRPM score based on various clinical and echocardiographic traits.
- The model was validated against a dataset, showing that both low and high CHIRPM scores significantly correlated with LAAev levels, offering a new way to assess stroke risk among individuals with AF.
In this Letter, we propose a crackless high-aspect-ratio processing method based on a temporally shaped ultrafast laser. The laser pulse is temporally split into two sub pulses: one with smaller energy is used to excite electrons but without ablation so that the applied pressure to the sample is weak, and the other one is used to heat the electrons and achieve material removal after it is temporally stretched by a chirped volume Bragg grating (CVBG). Compared with the conventional ultrafast laser processing, the crack generation is almost suppressed by using this proposed method.
View Article and Find Full Text PDFFormation and properties of spatially inhomogeneous plasma density gratings.
Phys Rev E
November 2023
Institut für Theoretische Physik I, Heinrich-Heine-Universität Düsseldorf, D-40225 Düsseldorf, Germany.
Volume plasma density gratings receive increasing interest since, compared to solid-state optical media, they posses significantly higher damage thresholds. The gratings are produced by counterpropagating laser pulses in underdense plasma. When analyzing their optical properties, usually they are assumed to be homogeneous in space.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!