scholarly journals Practical Broad-Band Tuning of Dye Lasers by Solvent Shifting

1986 ◽  
Vol 6 (6) ◽  
pp. 361-371 ◽  
Author(s):  
Susan M. Grenci ◽  
George R. Bird ◽  
Brian W. Keelan ◽  
Ahmed H. Zewail
Keyword(s):  
Wavelength Range ◽  
Tuning Range ◽  
Broad Band ◽  
Laser Wavelength ◽  
Solvent Composition ◽  
Laser Dye ◽  
Emission Profile ◽  
Laser Experiments ◽  
Pure Methanol ◽  
Dye Solutions

We have operated a dye laser over a broad wavelength range (593.8–667.0 nm) by shifting the dye emission profile with incremental changes of solvent composition. This was accomplished with the laser operating continuously, and only minor adjustment of the laser optics was required. Solvent tuning was facilitated by the critical dependence of the optimum laser wavelength on concentration of the second solvent. Using the known solvent-sensitive laser dye 9-diethylaminobenzo[a]phenoxaz-5-one (DBP), 87% of the tuning range from pure xylenes to pure methanol was covered by cumulative addition of 24 vol. % methanol to the starting xylenes solution. The optimum dye concentration was found to be independent of solvent composition, so that maximum laser power could be maintained by mixing equimolar dye solutions in the two solvents. These results establish the practicality of solvent-tuning as a method of conducting laser experiments over a broad wavelength range.

scholarly journals Investigation of Ce-=SUP=-3+-=/SUP=- impurity centers in UV active media Ce:LiCaAlF-=SUB=-6-=/SUB=- and Ce:LiSr-=SUB=-0.8-=/SUB=-Ca-=SUB=-0.2-=/SUB=-AlF-=SUB=-6-=/SUB=- -=SUP=-*-=/SUP=-

2019 ◽  
Vol 61 (5) ◽  
pp. 855
Author(s):  
A.A. Shavelev ◽  
A.S. Nizamutdinov ◽  
V.V. Semashko ◽  
S.L. Korableva ◽  
M.A. Marisov ◽  
...  
Keyword(s):  
Mixed Crystal ◽  
Tuning Range ◽  
Laser Wavelength ◽  
Wavelength Tuning ◽  
Kinetic Properties ◽  
Segregation Coefficient ◽  
Active Media ◽  
Differential Efficiency ◽  
Fluoride Crystals ◽  
Laser Experiments

Fluoride crystals with the colquiriite structure LiCaAlF6 doped with Ce3+ ions are used as active media for lasers of ultraviolet spectral range with advantages of laser wavelength tuning range and no photoinduced degradation of laser properties. In this work we show that the multicenter character of Ce3+ segregation in this matrix agrees with the previously known peculiarities. On the basis of spectral-kinetic properties investigation, we show the increase of segregation coefficient for Ce3+ in LiSr0.8Ca0.2AlF6 mixed crystal. In laser experiments with Ce : LiCaAlF6 crystal, the differential efficiency of 47% and the wavelength tuning from 281 to 312 nm have been reached.

scholarly journals Experimental evidence of the generation of multi-hundred megabar pressures in 0.26 μm wavelength laser experiments

1986 ◽  
Vol 4 (3-4) ◽  
pp. 413-419 ◽  
Author(s):  
R. Fabbro ◽  
B. Faral ◽  
J. Virmont ◽  
H. Pepin ◽  
F. Cottet ◽  
...  
Keyword(s):  
Shock Wave ◽  
Experimental Evidence ◽  
Laser Wavelength ◽  
Aluminium Foil ◽  
Step Method ◽  
X Ray ◽  
Laser Experiments ◽  
The Impact

A 9 μm thick aluminium foil is accelerated to a velocity of about 160 km/s by a laser of 0.26 μm wavelength and intensity of 1015 W/cm2 and collides with an aluminium impact foil. The measurement of the velocity of the induced shock wave in the impact foil, using a step method at the rear of the impact foil, gives pressures in the multi-hundred megabar range. The dynamics and constraints of this shock wave are presented and the effect of X-ray preheating, which can be important at this laser wavelength, is discussed.

scholarly journals Electro-Steering Tapered Fiber-Optic Device with Liquid Crystal Cladding

2019 ◽  
Vol 2019 ◽  
pp. 1-11 ◽  
Author(s):  
Joanna Korec ◽  
Karol A. Stasiewicz ◽  
Olga Strzeżysz ◽  
Przemysław Kula ◽  
Leszek R. Jaroszewicz
Keyword(s):  
Electromagnetic Wave ◽  
Liquid Crystal ◽  
Wavelength Range ◽  
Electromagnetic Wave Propagation ◽  
Fiber Optic ◽  
Broad Band ◽  
Fiber Taper ◽  
Optical Fiber Taper ◽  
Structure Liquid

The paper presents the results of design, manufacturing, and characterization of a hybrid broad band in-line fiber-optic device. It uses nematic liquid crystal as cladding with electro-steering properties in a biconical optical fiber taper structure. Liquid crystal mixtures denoted as 6CHBT and E7 are designed for electric as well as temperature control of electromagnetic wave propagation in a broad wavelength range. The applied taper with 10±0.5 μm diameters has losses lower than 0.5 dB in whole investigated spectrum range. Three kinds of initial liquid crystal molecules’ orientations (parallel, orthogonal, and twist) in relation to the light beam propagating in a taper were applied. The performance of a tuned cladding was studied at an electric field of the range of 0–190 V and the temperature range from 20°C up to 42°C and 59°C for 6CHBT and E7, respectively. The induced reorientation of liquid crystal molecules was measured at a broad wavelength range (550-1550 nm).

scholarly journals Enlargement of the organic solid-state DFB laser wavelength tuning range by the use of two complementary luminescent dyes doped into the host matrix

2017 ◽  
Vol 19 (27) ◽  
pp. 18068-18075 ◽  
Author(s):  
Kacper Parafiniuk ◽  
Lech Sznitko ◽  
Dominika Wawrzynczyk ◽  
Andrzej Miniewicz ◽  
Jaroslaw Mysliwiec
Keyword(s):  
Solid State ◽  
Tuning Range ◽  
Laser Wavelength ◽  
Polymeric Matrix ◽  
Wavelength Tuning ◽  
Molecular Aggregates ◽  
Host Matrix ◽  
Organic Solid ◽  
Dfb Laser ◽  
Organic Solid State

Broad range tunable DFB lasing was achieved by the utilization of two dyes forming molecular aggregates within the polymeric matrix.

Absorption spectroscopy of laser excited europium vapour

1983 ◽  
Vol 387 (1793) ◽  
pp. 389-406 ◽  
Keyword(s):  
Wavelength Range ◽  
Background Radiation ◽  
Line Strength ◽  
Broad Band ◽  
Dye Laser ◽  
Resonance Radiation ◽  
Nitrogen Laser ◽  
Principal Resonance ◽  
Ionization Limit ◽  
D Orbitals

Absorption spectra of europium vapour irradiated by intense, monochromatic resonance radiation at the wavelengths of the three principal resonance lines, 4f 7 6s 2 , 8 S ( J = 7/2) → 4f 7 6s6p, y 8 P ( J = 5/2,7/2, and 9/2) at 466.2, 462.7 and 459.4 nm respectively, have been photographed at high resolution. Pulsed resonance radiation was obtained from a tunable, narrowband dye laser pumped by a nitrogen laser: a broad-band dye laser pumped by the same nitrogen laser provided background radiation. Our spectra covered the ranges 380-400 nm, and 410-450 nm, each one showing transitions from a single resonance level to upper levels in the region of either the 4f 7 6s, 7 S or the 4f 7 6s, 9 S ionization limit of Eu II. In the shorter wavelength range the spectra consisted of weak autoionized series converging towards the 7 S limit. In the longer wavelength range the three spectra were surprisingly dissimilar. The majority of the upper levels could be arranged into five highly-perturbed series, one corresponding to each of the J values 3/2, 5/2, 7/2, 9/2 and 11/2. These series arose from excitation of the 6p electron to high lying d-orbitals. The absorption transitions to the series members are only prominent in regions where the series are strongly perturbed, indicating that most of the line strength is derived from the perturbing levels. Possible origins for the perturbing levels are discussed. Little evidence was found for a series arising from excitation of the 6p electron to high lying s-orbitals.

scholarly journals Coumarin 4 Laser dye/PVP Polymer/Al2O3 Nanoparticle Thin Films Induced by Er: YAG Laser Radiation

2019 ◽  
Vol 54 (4) ◽  
Author(s):  
Mithaq M. Mehdy Al-Sultani
Keyword(s):  
Thin Films ◽  
Electrical Conductivity ◽  
Dielectric Constant ◽  
Magnetic Susceptibility ◽  
Electrical Properties ◽  
Response Time ◽  
Electrical Response ◽  
Laser Wavelength ◽  
Laser Dye ◽  
Yag Laser

In this paper, thin films were made of 10-4 mol/l of Coumarin 4 laser dye dissolved in ethanol, 0.3 g of PVP polymer and 0.04 g of Al2O3 nanoparticles. The electrical properties such as dielectric constant, phase velocity of laser photons inside the film, the film permittivity and permeability, medium impedance, electrical conductivity, skin depth, the electrical response time, magnetic susceptibility and dielectric time have been studied for the prepared thin films at two different Er:YAG laser wavelengths of 1645nm and 1617 nm based on various laser powers in one time and with changed laser exposure periods in the other time. It is observed that the highest laser power consolidates each value of dielectric constant, dielectric time, electrical conductivity, the electrical response time, magnetic susceptibility and the permeability of film because of increasing the abundant energy in films within laser irradiation. The most important conclusion is that the electrical properties were much higher for the prepared thin films irradiated with 1645nm Er: YAG laser wavelength than for those irradiated with 1617nm laser wavelength.

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