Figure - available via license: CC BY
Content may be subject to copyright.
Source publication
We have experimentally demonstrated an efficient all-fiber passively Q-switched Yb-doped fiber laser with Samarium doped fiber as a saturable absorber. Average output power of 3.4 W at a repetition rate of 250 kHz and a pulse width of 1.1 microseconds was obtained at a pump power of 9.0 W. By using this fiber laser system and an MgO-...
Similar publications
We have developed a watt-level random laser at 532 nm. The laser is based on a 1064 nm random distributed ytterbium (Yb) gain-assisted fiber laser seed with a 0.35 nm linewidth and 900 mW polarized output power. A study for the optimal length of the random distributed mirror was carried out. A Yb-doped fiber master oscillator power amplifier archit...
Citations
... SHG has only subfemtosecond response times compared to fluorescence in the nanosecond range; thereby, it provides a huge opportunity for newly developed technology such as optical displays that require fast response times. 31,32 Here, we present a SHG-based full-color display as a proofof-concept demonstration for the first time, motivated by the advantageous nonlinear photon transformations described above. To develop a novel laser-projection display with microscale pixel patterns for use as full-color luminescence, Se nanowires (NWs) were synthesized as an optically functional nanomaterial and precisely positioned in a highly uniform fashion on a lithographically patterned substrate. ...
The second-harmonic generation (SHG) phenomenon, which readily supports the characteristic advantages of promising laser-based display systems, brings a new concept to advanced displays. Here, we demonstrate a laser projection display that utilizes the fabrication and design principles in individual micron-scale pixel arrays by depositing colloidal Se nanowires, a nonlinear optical nanomaterial for full-color light emission. Our system reveals the manufacturing process of planar light-emitting elements without the use of complex color segments, and the layout represents a full-color laser display with high-resolution pixels extracted from the combination of a pulsed femtosecond laser scanning process to access the frequency up-conversion technique based on a wavelength-tunable manner. The work presents attractive features for newly emerging multifunctional optical components composed of unique nanomaterials that can be applied for displays, bioimaging, and other optoelectronic devices.
... However, the spectral output of a Q-switched fiber laser typically consists of 1 E-mail: ee13d057@ee.iitm.ac.in P r e -p r i n t multiple wavelengths [5], and an intra-cavity filter is required to demonstrate spectrally clean pulses [6,7]. As such, the use of an intra-cavity tunable filter facilitates an appropriate control of the output wavelength required for the above applications [8,9,10]. ...
We investigate numerically the impact of spectral filtering on pulse characteristics in anomalous dispersion erbium-doped fiber laser mode-locked with carbon nanotube-based saturable absorber. The laser can operate only in a single-pulse state without a filter, while it will transit to bound soliton states once the saturation energy of the gain fiber and the bandwidth of the filter are carefully chosen, respectively. Further analyzation shows that the operation of a single-pulse lasing from dissipative soliton to conventional soliton can be selectively targeted by changing the bandwidth of the filter through the loss and frequency narrowing effects. Laser performances, such as spectrum structure, pulse duration, pulse energy and peak power in both the frequency and the time domains, will all be affected. This paper provides a guidance for the mode-locked fiber laser and proposes a feasible way to control the pulse dynamics.
... However, the spectral output of a Q-switched fiber laser typically consists of 1 E-mail: ee13d057@ee.iitm.ac.in P r e -p r i n t multiple wavelengths [5], and an intra-cavity filter is required to demonstrate spectrally clean pulses [6,7]. As such, the use of an intra-cavity tunable filter facilitates an appropriate control of the output wavelength required for the above applications [8,9,10]. ...
We present a numerical simulation, validated by experimental analysis, of the effect of wavelength filtering on pulse dynamics of a wavelength-tunable Erbium-doped fiber Q-switched laser in a ring configuration. Travelling wave time-dependent model is implemented using finite difference time domain (FDTD) method to accurately simulate the population dynamics and the pulse evolution in the ring laser. Such a model is experimentally validated for a wavelength tunable Q-switched fiber laser and stable Q-switched pulses are obtained over a wavelength tuning range of ∼30 nm in the C-band.
... Gan Further author information: (Send correspondence to Deepa Venkitesh.) Deepa Venkitesh: E-mail: deepa@ee.iitm.ac.in et al. 5 have demostrated SHG using 13.6 µJ, 1.1 µs pulses at 250 kHz repetition rate, using FBG for enhancing the spectral quality of the output. ...
... It is inferred that the simulation model is capable of predicting the experimental output with considerable accuracy. The center wavelength of the filter is tuned across the C-band and output characteristics were observed in spectral and temporal domain, as shown in figure (5). It is observed that Q-switching operation could be carried out over the entire C-band, and is limited only by the filter characteristics. ...
The details of the design and implementation of a narrow linewidth,
wavelength-tunable and variable repetition-rate short pulse Q-switched
fiber laser are discussed. A traveling wave model is used in conjunction
with Finite different time domain method to account for propagation
delays, spatial distribution of powers and population densities in the
laser. A tunable repetition rate and tunable wavelength laser is
demonstrated experimentally, yielding pulses of peak power 7.1 W, width
212 ns (at 1533 nm) and a repetition rate of 10 kHz. The paper further
discusses the simulation and experimental results of the characteristic
features of tunable wavelength and tunable repetition rate pulsed laser.
... Recently such crystal saturable absorbers have also been applied to fiber lasers. For example, passively Qswitched Er doped fiber lasers using Co 2+ :ZnSe [22,23], Er-Yb co-doped fiber lasers using Co 2+ :ZnS [24], Cr 2+ :ZnSe [25] [28,29] or Sm [30] doped fiber, and using a fiber Bragg grating as a rear mirror. [15][16][17]. ...
... The first is the all-fiber design, which has the major advantage over free space optics of compactness, robustness and freedom from adjustment. All fiber passive switching has been achieved by splicing Yb double clad fiber to a piece of Sm doped fiber [30]; however, the pulse duration is in the µs range and the peak power is only ∼12 W. A Cr 4+ :YAG crystal fiber laser [104] and amplifier [28] have also been reported, which might be employed as a saturable absorber in all fiber passively Q-switched fiber lasers. The model calculations described in this thesis will also be applicable to simulating such an all-fiber passively Q-switched fiber laser. ...
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
The chapter describes fundamental aspects of non-linear optics and introduces the reader to a wide range of nonlinear optical phenomena. The description starts with Maxwell’s equations, nonlinear polarization and followed by nonlinear wave equation, and its application to several important high order nonlinear processes. The covered nonlinear processes are described in details at both theoretical and practical levels, including examples of demonstrated fiber lasers with nonlinear frequency conversion.
