scholarly journals Low-threshold and narrow-linewidth perovskite microlasers pumped by a localized waveguide source

Nanophotonics ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Hui Liu ◽  
Haoran Yu ◽  
Lun Dai ◽  
Zhi Li ◽  
Jianjun Chen
Keyword(s):  
Pump Power ◽  
Integrated Circuits ◽  
Free Space ◽  
Plane Waveguide ◽  
Spatial Mismatch ◽  
High Pump Power ◽  
Pump Power Threshold ◽  
Power Threshold ◽  
High Pump ◽  
Laser Modes

Abstract For the widely used vertically pumped (VP) method with a free-space beam, very little pump power is absorbed by the gain materials in microlasers because of the large spatial mismatch of areas between laser modes and free-space pump beams together with small thicknesses of gain materials, resulting in a high pump power threshold. Here, an in-plane-waveguide-pump (IPWP) method with a localized waveguide source is proposed to reduce pump power threshold of perovskite microlasers. Owing to reduced spatial mismatch of areas between laser modes and localized waveguide sources as well as increased absorption distances, the pump power threshold of the IPWP method is decreased to approximately 6% that of the VP method. Moreover, under the same multiple of the pump power threshold, the laser linewidth in the IPWP method is narrowed to approximately 70% that in the VP method. By using the IPWP method, selective pumping two adjacent (separation 2 or 3 μm) parallel-located perovskite microlasers is experimentally demonstrated, and no crosstalk is observed. This IPWP method may have applications in low-energy and high-density microlasers and photonic integrated circuits.

scholarly journals Observation of direction instability in a fiber ring laser

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Muhammad Assad Arshad ◽  
Alexander Hartung ◽  
Arni Candra Pratiwi ◽  
Matthias Jäger
Keyword(s):  
Pump Power ◽  
Ring Laser ◽  
Instability Threshold ◽  
Fiber Ring Laser ◽  
Fiber Ring ◽  
Pump Power Threshold ◽  
Power Threshold ◽  
Length Scaling

AbstractWe report on the observation of a new phenomenon occurring in a fiber ring laser. This phenomenon is about the transition from an initially bidirectional emission of a reciprocal fiber ring laser to a unidirectional emission at a certain pump power threshold. In addition, the final direction is not predefined but appears to be randomly chosen every time the threshold is exceeded. Therefore, we term this new phenomenon direction instability. Furthermore, we provide a first discussion of how the instability threshold is influenced by the length and the loss of the cavity. We show that the threshold follows a power times length scaling, indicating a nonlinear origin.

NON-DEMOLITIVE PHOTON NUMBER MEASUREMENT VIA χ(2) NONLINEARITY

1999 ◽  
Vol 13 (28) ◽  
pp. 3383-3392 ◽  
Author(s):  
STEFANIA CASTELLETTO ◽  
IVO PIETRO DEGIOVANNI ◽  
MARIA LUISA RASTELLO
Keyword(s):  
Pump Power ◽  
Beam Splitter ◽  
Nonlinear Crystal ◽  
Photon Number ◽  
High Accuracy ◽  
Relative Uncertainty ◽  
Theoretical Evaluation ◽  
High Pump Power ◽  
Coherent Field ◽  
High Pump

The aim of this paper is to present a possible experiment for measuring photon number by a non-demolitive scheme. We show that, in principle, it is possible to deduce the number of photons of an intense pump coherent field by measuring the phase-shift on two frequency conjugated beams due to the interaction with the pump in a nonlinear crystal, which exhibits χ(2) nonlinearity. We perform a theoretical evaluation of the relative uncertainty associated to the photon number measurement, obtaining high accuracy results when high pump power levels, low coupling between pump and crystal and squeezing generators are used. The accuracy obtained are compared with results obtainable with a beam splitter setup.

Design of EDFA based 16 channel WDM system using counter directional high pump power

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Md. Asraful Sekh ◽  
Mijanur Rahim ◽  
Anjumanara Begam
Keyword(s):  
Pump Power ◽  
Wavelength Division Multiplexing ◽  
Input Power ◽  
Low Noise ◽  
Fiber Amplifiers ◽  
Wavelength Division ◽  
High Pump Power ◽  
Erbium Doped ◽  
High Pump ◽  
Channel Wavelength

Abstract In this paper, design of erbium-doped fiber amplifiers (EDFA) based 16 channel wavelength-division multiplexing (WDM) system for different pump powers and input signal levels using counter propagating pumping scheme is reported. Wavelength range between 1548 and 1560 nm in C-band with channel spacing of 0.75 nm at a bit rate of 10 Gbps are used. Input power given to all the channels is taken between −20 and −35 dBm with 3 dBm variation. Pump power levels between 100 and 500 mW at 980 nm wavelength are used. Low gain flatness with high gains and low noise figures are achieved with the proposed scheme.

Strain and Temperature Discrimination Using High-Birefringence Erbium-Doped Fiber Loop Mirror With High Pump Power Laser

2008 ◽  
Vol 20 (12) ◽  
pp. 1033-1035 ◽  
Author(s):  
Orlando Frazao ◽  
Diogo Egypto ◽  
Lucas Aragao-Bittencourt ◽  
Maria T. M. R. Giraldi ◽  
Manuel B. Marques
Keyword(s):  
Pump Power ◽  
Power Laser ◽  
High Birefringence ◽  
High Pump Power ◽  
Erbium Doped ◽  
High Pump ◽  
Fiber Loop Mirror ◽  
Loop Mirror ◽  
Fiber Loop

Two-LP-Mode Six-Core Cladding Pumped EDFA With High Pump Power Density

2018 ◽  
Vol 36 (2) ◽  
pp. 331-335 ◽  
Author(s):  
Masaki Wada ◽  
Taiji Sakamoto ◽  
Shinichi Aozasa ◽  
Takayoshi Mori ◽  
Takashi Yamamoto ◽  
...  
Keyword(s):  
Pump Power ◽  
Power Density ◽  
Pump Power Density ◽  
High Pump Power ◽  
High Pump

Large Phase Sensitive Gain in Periodically Poled Lithium–Niobate With High Pump Power

2011 ◽  
Vol 23 (7) ◽  
pp. 426-428 ◽  
Author(s):  
Benjamin J. Puttnam ◽  
Dániel Mazroa ◽  
Satoshi Shinada ◽  
Naoya Wada
Keyword(s):  
Pump Power ◽  
Lithium Niobate ◽  
Periodically Poled ◽  
Periodically Poled Lithium Niobate ◽  
High Pump Power ◽  
Large Phase ◽  
High Pump ◽  
Phase Sensitive

scholarly journals Power-efficient generation of two-octave mid-IR frequency combs in a germanium microresonator

Nanophotonics ◽  
2018 ◽  
Vol 7 (8) ◽  
pp. 1461-1467 ◽  
Author(s):  
Yuhao Guo ◽  
Jing Wang ◽  
Zhaohong Han ◽  
Kazumi Wada ◽  
Lionel C. Kimerling ◽  
...  
Keyword(s):  
Pump Power ◽  
Frequency Comb ◽  
Wide Band ◽  
Power Efficient ◽  
Frequency Combs ◽  
Dispersion Engineering ◽  
High Pump Power ◽  
High Pump ◽  
Limited Power ◽  
Comb Generation

AbstractOctave-spanning frequency comb generation in the deep mid-infrared (>5.5 μm) typically requires a high pump power, which is challenging because of the limited power of narrow linewidth lasers at long wavelengths. We propose twofold dispersion engineering for a Ge-on-Si microcavity to enable both dispersion flattening and dispersion hybridization over a wide band from 3.5 to 10 μm. A two-octave mode-locked Kerr frequency comb can be generated from 2.3 to 10.2 μm, with a pump power as low as 180 mW. It has been shown that dispersion flattening greatly enhances the spectral broadening of the generated comb, whereas dispersion hybridization improves its spectral flatness.

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