scholarly journals Generation of Entangled Photons by A Short Coherence Length Violet Diode Laser

2013 ◽  
Vol 6 (2) ◽  
pp. 77-85
Author(s):  
Ra'ad Subhi Abbood ◽  
Ahmed I. Khaleel ◽  
Shelan Kh. Tawfeeq
Keyword(s):  
Diode Laser ◽  
Output Power ◽  
Coherence Length ◽  
Count Rate ◽  
Coherence Time ◽  
Optic Axis ◽  
Phase Matching ◽  
Type Ii ◽  
Entangled Photons ◽  
Coincidence Count Rate

Pumping a BBO crystal by a violet diode laser with a wavelength of (405  nm) output power of (24 mW) and a line width of (3nm) was employed to generate entangled  photons with a wavelength of 810 nm by achieving type II phase matching conditions. The coincidence count rate obtained in this experiment was in the range of (18000) counts/s. Two BBO crystals with different thicknesses of (4 mm and 2 mm) were tested, where maximum count rates of about (18000) counts/s was obtained with a (5*5*2) mm BBO crystal where the short coherence time for the pumping source was tolerated by using shorter  BBO crystals. Also, the effect of compensating crystal on the walk-off effect was studied. The coincidence count rates were increased by using these crystals when their optic axes were fixed in the opposite direction relative to the optic axis of the original BBO crystal

Theoretical analysis of collinear spontaneous parametric down conversion properties in BiB3O6

2014 ◽  
Vol 23 (02) ◽  
pp. 1450021
Author(s):  
Meizhi Zhang ◽  
Guangwen Huo
Keyword(s):  
Dielectric Dispersion ◽  
Phase Matching ◽  
Biaxial Crystal ◽  
Type I ◽  
Type Ii ◽  
Entangled Photons ◽  
Parametric Down Conversion ◽  
Effective Phase ◽  
Down Conversion

In this paper, we report on the collinear spontaneous parametric down conversion (SPDC) with quantum theory in angle picture. Based on angle-dependent refractive index of biaxial crystal and the dielectric dispersion, we numerically simulate the effective nonlinear coefficients of BiB 3 O 6 (BIBO) crystal in principle planes. The results indicate that the most effective phase matching scheme is the type I in yz plane, while the secondary options are the type I, type II in xz plane. Considering the derivation of angular phase matching conditions, the calculation is convenient, and it is superior in determination of the spatial distribution of entangled photons.

Diode-laser-pumped tunable 896–9395-nm neodymium-doped fiber laser with 43-mW output power

1998 ◽  
Vol 37 (15) ◽  
pp. 3276 ◽  
Author(s):  
Anthony L. Cook ◽  
Herbert D. Hendricks
Keyword(s):  
Fiber Laser ◽  
Diode Laser ◽  
Output Power

Reduction of the spectral width and beam divergence of a BBO-OPO by using collinear type-II phase matching and back reflection of the pump beam

2001 ◽  
Vol 72 (5) ◽  
pp. 583-589 ◽  
Author(s):  
G. Anstett ◽  
G. Göritz ◽  
D. Kabs ◽  
R. Urschel ◽  
R. Wallenstein ◽  
...  
Keyword(s):  
Pump Beam ◽  
Spectral Width ◽  
Beam Divergence ◽  
Phase Matching ◽  
Type Ii ◽  
Back Reflection

Influence of Rapid Thermal Annealing on Self-assembled Quantum-dot Superluminescent Diodes

2005 ◽  
Vol 866 ◽  
Author(s):  
Z.Y. Zhang ◽  
Y.Y. Tsui ◽  
R. Fedosejevs ◽  
Z.G. Wang
Keyword(s):  
Output Power ◽  
Wavelength Division Multiplexing ◽  
Coherence Length ◽  
Spectral Width ◽  
Antireflection Coating ◽  
Light Sources ◽  
High Output Power ◽  
Rayleigh Backscattering ◽  
Superluminescent Diodes ◽  
High Output

Superluminescent diodes (SLD) have great potential for application as light sources including optical gyroscopes and sensors, optical time domain reflectometers (OTDR) and wavelength-division multiplexing (WDM) system testing. High output power and large spectral bandwidth are key features for SLD. High output power has been attempted by antireflection coating of the facet and utilizing the tapered active region. In addition, as the spectral width broadened, the coherence length is reduced. The short coherence length can reduce the Rayleigh backscattering in fiber gyroscope systems and can improve the spatial resolution in OTDR application. Therefore, broadening spectral width of SLD offers an advantage for obtaining the ultimate sensitivity in these applications.

High-Power Low-Threshold Optically Pumped Type-ll Quantum-Well Lasers

1997 ◽  
Vol 484 ◽  
Author(s):  
Chih-Hsiang Lin ◽  
S. J. Murry ◽  
Rui Q. Yang ◽  
S. S. Pei ◽  
H. Q. Le ◽  
...  
Keyword(s):  
Quantum Well ◽  
Output Power ◽  
Optical Pumping ◽  
Internal Quantum Efficiency ◽  
Characteristic Temperature ◽  
Stimulated Emission ◽  
Free Carrier Absorption ◽  
Type Ii ◽  
Optically Pumped ◽  
Internal Loss

AbstractStimulated emission in InAs/InGaSb/InAs/AlSb type-II quantum-well (QW) lasers was observed up to room temperature at 4.5 μm, optically pumped by a pulsed 2-μm Tm:YAG laser. The absorbed threshold peak pump intensity was only 1.1 kW/cm2 at 300 K, with a characteristic temperature T0 of 61.6 K for temperatures up to 300 K. We will also study the effects of internal loss on the efficiency and output power for type-II QW lasers via optical pumping. Using a 0.98-μm InGaAs linear diode array, the devices exhibited an internal quantum efficiency of 67% at temperatures up to 190 K, and was capable of < 1. 1-W peak output power per facet in 6-μs pulses at 85 K. The internal loss of the devices exhibited an increase from 18 cm−1 near 70 K to ∼ 60–100 cm−1 near 180 K, which was possibly due to inter-valence band free carrier absorption.

Fiber-coupled diode laser systems up to 2-kW output power

2000 ◽  
Author(s):  
Friedhelm Dorsch ◽  
Veit Bluemel ◽  
Matthias Schroeder ◽  
Dirk Lorenzen ◽  
Petra Hennig ◽  
...  
Keyword(s):  
Diode Laser ◽  
Output Power ◽  
Laser Systems

Bandwidth analysis of non-collinear fourth and fifth harmonic generation in nonlinear uniaxial crystals

2017 ◽  
Vol 26 (01) ◽  
pp. 1750014
Author(s):  
Dongsheng Song ◽  
Yuanlin Zheng ◽  
Xiaohui Zhao ◽  
Zengyan Cai ◽  
Xianfeng Chen
Keyword(s):  
Numerical Calculation ◽  
Harmonic Generation ◽  
Phase Matching ◽  
Type I ◽  
Type Ii ◽  
Optimal Angle ◽  
Fourth Harmonic ◽  
Calculation Results ◽  
Bandwidth Analysis

The optimal angle bandwidth and wavelength bandwidth of fourth-harmonic generation (FHG) and fifth-harmonic generation (FIFHG) of the 1064[Formula: see text]nm laser are analyzed based on the numerical calculation results of non-collinear type-I and type-II phase matching processes for general nonlinear uniaxial crystals with 1[Formula: see text]cm length. The non-collinear phase matching angles and effective nonlinear coefficients of FHG and FIFHG are calculated. The optimal angle bandwidth and wavelength bandwidth are obtained. The results are beneficial to broadband and efficient non-collinear phase matching FHG and FIFHG experiments and studies.

1030nm DBR tapered diode laser with up to 16 W of optical output power

2017 ◽  
Author(s):  
A. Müller ◽  
C. Zink ◽  
J. Fricke ◽  
F. Bugge ◽  
O. Brox ◽  
...  
Keyword(s):  
Diode Laser ◽  
Output Power ◽  
Optical Output Power ◽  
Optical Output ◽  
Tapered Diode Laser
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