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- Researchers developed a wavelength-selectable deep-red laser using a Nd:YLF/KGW Raman laser, driven by a 1314 nm acousto-optic Q-switched laser.
- The setup generated two first-Stokes waves and employed a bismuth borate (BIBO) crystal for frequency conversion, producing four deep-red emissions at 692, 698, 731, and 745 nm.
- The system achieved average output powers ranging from 2.4 to 3.6 W, with high peak powers and short pulse durations, indicating its reliability for multi-wavelength deep-red laser applications.
Dual trace inter-pulse interferometer for measurement of phase stability of ultra short laser pulse train.
Rev Sci Instrum
February 2021
Laser Technology Division, Raja Ramanna Centre for Advanced Technology, Indore 452013, India and Homi Bhabha National Institute, Mumbai 400094, India.
A dual trace intra-pulse and inter-pulse spatio-spectral interferometer has been set up to study the temporal stability of a ∼200 fs duration laser pulse train from a cw mode-locked laser oscillator. Simultaneous recording of twin interferograms helps identify the phase error in inter-pulse interferograms due to the diagnostic setup kept in a standard laboratory environment. Applicability of inter-pulse tilted pulse-front interferograms has been demonstrated to constitute an alternative inexpensive method for visual detection and estimation of phase slippage and pulse repetition frequency of an ultra short pulse train.
View Article and Find Full Text PDFPulse dynamics controlling is of great importance for high quality pulse generation in ultra-short pulse fiber lasers. The pulse quality characteristics in terms of pulse duration, energy, chirp profile, tunability, as well as noise feature substantially depend on intracavity pulse propagation dynamics. Here we found that a nonlinear amplifying loop mirror mode-locked thulium-doped fiber laser can switch among enabling operation conventional soliton, stretched-pulse soliton and dissipative soliton regimes only by manipulating an intracavity phase bias device.
View Article and Find Full Text PDFWe propose a passively mode-locked fiber optical parametric oscillator assisted with optical time-stretch. Thanks to the lately developed optical time-stretch technique, the onset oscillating spectral components can be temporally dispersed across the pump envelope and further compete for the parametric gain with the other parts of onset oscillating sidebands within the pump envelope. By matching the amount of dispersion in optical time-stretch with the pulse width of the quasi-CW pump and oscillating one of the parametric sidebands inside the fiber cavity, we numerically show that the fiber parametric oscillator can be operated in a single pulse regime.
View Article and Find Full Text PDFWe report on the gyroscopic effect detection in the bidirectional ultra-short pulse hybridly mode-locked erbium-doped all-fiber ring soliton laser. Owing to the Kerr nonlinearity contribution through self-phase modulation and self-steepening effects to the carrier-to-envelope phase slip of both clockwise and counterclockwise solitons, wideband controllable tuning of a gyroscope bias point has been demonstrated by means of appropriate adjustment of either intracavity polarization or pump power. Angular velocity detected ranges from 0.
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