A note on the dispersion of a prism used as a beam expander in a nitrogen laser pumped dye laser

It is shown that the dispersion of the prism material in a grating tuned dye laser containing an intracavity prism beam expander cannot be neglected in practical situations.     

The use of a diffraction grating as a beam expander in a dye laser cavity

The use of a diffraction grating as a dispersive one-dimensional beam expander with variable expansion ratio is described. The idea is applied to intracavity beam expansion in a dye laser cavity containing two gratings in a tandem configuration. By varying the beam expansion ratio up to 60 the laser linewidth may be reduced continously down to 0.1 cm^-1. Linewidth calculations based on single pass estimates are presented and found to agree with experimental results.     

Power output coupling in a dye laser pumped by a nitrogen laser

A simple model for the operation of a pulsed dye laser, transversely pumped by a nitrogen laser, is presented. We consider the combined effect of the transmission of the laser output coupler, its distance from the dye cell and the saturated gain characteristics of the dye laser medium, on the operation of the laser. Experimental results are interpreted in terms of this model.     

Wavelength tuning of nitrogen pumped dye laser

In this paper a method is described for continuous wavelength tuning of nitrogen pumped dye laser by changing the concentration of an additional dye in the lasing solution.     

Observation of photon echoes using a nitrogen laser pumped dye laser

Photon echoes have been observed using a nitrogen laser pumped dye laser as the excitation source. The echo was obtained in the ³H₄→³P₀ transition in Pr³⁺:LaF₃. The dependence of echoes on magnetic field and temperature was measured.     

Comparative study of beam expanders used in nitrogen laser pumed dye lasers

Four methods of beam expanding in nitrogen laser pumped dye lasers were investigated, and compared. The most important parameters of beam expanders were considered i.e. the magnification, and the efficiency of feedback. Besides the optimalization of multiple-prism beam expanders, a new combined beam expander was studied, and optimalized. This combined, prism-grating beam expander produced high efficiency of feedback in a wide range of magnifications and easily produced single mode operation with 4% energy conversion efficiency.     

Narrow linewidth,tunable dye laser by multiple-prism beam expander

12 mJ, 10-Hz green pulses from frequency doubled Nd:YAG laser was used for pumping Rhodamine 6G in a dye laser based on multiple-prism beam expander. In order to increase the stability of the output pulse, a unique dye cell with variable dimensions of active medium was designed and constructed. By using multiple-prism dispersion theory, conditions for zero-dispersion in two and four-prism beam expander configuration was calculated. In the case of two-prism configuration, tuning range of dye laser was 565–595 nm and the linewidth of pulse at 580 nm was about 1.8 nm and it is in good agreement with the calculated amount of 1.6 nm. Furthermore, using four-prism configuration tuning range of 570–585 nm was measured and the linewidth of output pulse at 575 nm was reduced up to 0.33 nm. This value may be further improved up to 0.22 nm according these calculations. In this arrangement, creation of parasitic modes, aberration in two dimensions and most of the alignment problems with the lens telescopes were resolved.     

Subnanosecond amplified spontaneous emission pulses by a nitrogen pumped dye laser

Pulses of 100 ps duration and peak power up to 100 kW are obtained with a dye laser pumped by an atmospheric pressure nitrogen laser of 0.5 ns duration. The shortening of the dye laser pulses is attributed to amplified spontaneous emission.     

Amplified spontaneous emission from nitrogen laser pumped dye lasers

The nitrogen laser pumped dye laser output has been studied with emphasis on the behaviour of amplified spontaneous emission (ASE) with respect to the tuning wavelength, pump energy, dyes and their concentration and solvents. Spectral spread of ASE is narrower than fluorescence and its maximum is shifted towards the red side. However, lasing occurs beyond the ASE region. ASE is small at high gain wavelength and increases at the edges of the gain curve. Laser energy is highest at the ASE peak with minimum ASE present in the output. ASE is reduced with increased laser energy in the energy transfer dye lasers.     

Generation of tunable subnanosecond laser pulses with a nitrogen laser pumped dye laser amplifier system

A simple method for generating single tunable subnanosecond dye laser pulses is described. A Rhodamin 6G dye laser is transversely pumped by a subnanosecond UV pulse of a TEA nitrogen laser. The narrowband output of the dye laser is amplified and shortened in a synchronously pumped amplifier. Narrowband pulses with a duration of 30–40 ps (fwhm) and a pulse power of 30 kW are obtained. They are tunable over the range of 580–600 nm.     

The generation of tunable near IR radiation using a nitrogen laser pumped dye laser

Excitation transfer between the two components of a dye mixture has allowed a near IR dye laser to be pumped by a nitrogen laser. Several dye mixtures were employed to achieve lasing at all wavelengths within the range 6400–7720 Å. The output pulse powers were in excess of 10 kW over most of this range.     

Effects of prism beam expander and slits on excimer laser linewidth narrowing module

Theoretical simulation and experiments based on a prism beam expander and an echelle grating are conducted to study the dependence of linewidth and pulse energy on incidence angle and slit width. With a larger prism incident angle or narrower slit width, the linewidth becomes narrower while the laser pulse energy becomes lower. However, the pulse energy can be improved by optimally designing the prism beam expander. In addition, a subpicometer linewidth ArF laser is obtained with a double-prism beam expander and an echelle grating.     

直角棱镜激光衰减器的研究与实验

本文在分析平面反射和棱镜内光束传输规律的基础上,提出以直角棱镜用做无像差激光衰减器,并在宽、窄Ｈｅ Ｎｅ光束条件下,通过对激光光束质量因子Ｍ２的测量,验证棱镜反射应用衰减器对光束质量无显著影响。     

Color center laser pumped with a DCM dye laser

A CW, DCM dye laser has been used to pump a RbCl:Li crystal in a color center laser. The DCM dye laser was pumped by the 488 nm and 514.5 nm lines of an argon ion laser. When used in a broad band configuration the dye laser had a power output in the TEM₀₀ mode in excess of 600 mW at a wavelength of 655 nm. An output power in excess of 10 mW at 2.73 μm was possible from the RbCl:Li crystal in a Burleigh FCL for an input power of 600 mW at 655 nm. This method of pumping for the RbCl:Li alleviates the need for both argon ion and krypton ion laser pumps for the Burleigh FCL. All three crystals can be pumped to the specification power levels with a single argon ion laser.     

Color center laser pumped by a flashlamp-pumped dye laser

A reliable, pulsed, color center laser is described which provides a pulse energy up to 0.4 mJ in a wavelength range from 2.4 μm to 3.3 μm at a bandwidth below 20 GHz. A simple, broadband, flashlamp-pumped dye laser is used as the pump source. A new transverse pumping scheme of F-centers is described using hydrogenated color center crystal which allows to pump color center lasers with high energy pump pulses.     

Continuous wave dye laser pumped by a HeNe laser

Continuous wave operation of a dye laser pumped at 633 nm by a HeNe laser is reported. A jet of a cooled solution of Oxazine 1 in ethanol was used as the laser medium in an asymmetric spherical cavity. With mirrors of high reflectivity a threshold as low as 10 mW could be achieved.     

A subpicosecond dye laser pumped by a xenon ion laser

A pulsed xenon ion laser has been used to pump a rhodamine 6G dye laser utilizing a ring resonator. The dye laser has been passively mode-locked; a pulsewidth of 0.5 ps and a 50 kW peak power have been obtained.Work partly supported by Italian C.N.R.     

A mode-locked dye laser pumped by a xenon ion laser

Passive mode-locking of a rhodamine 6G dye laser has been achieved, using a pulsed xenon ion laser as a pumping source. A pulse width of 5 ps and a peak power of 4 kW have been obtained. Thermal problems were encountered, which adversely affected the operation of the dye laser. Work is in progress to improve these results.     

Modeling a distributed feedback dye laser pumped by a Nd-glass laser

A mathematical model has been developed to describe the dynamic emission of a distributed feedback dye laser (DFDL) pumped by a Nd-glass laser. The model is based on the coupled-wave theory. It allows the investigation of the temporal behavior of the Nd-glass pumping laser source and the DFDL pulses. The model allows studying the effect of the variation of the laser input parameters of the Nd-glass laser, such as maximum amplification coefficient, loss coefficient and pumping rate on the characteristics of DFDL pulses regarding the pulse width, delay time and separation time. The feedback process of the DFDL is provided either by changes of the refractive index or by optical gain or by both together. The model estimates the following: temporal behavior of the density of emitted radiation, energy densities of the first excited singlet and triplet states, DFDL output power, cavity decay time and the temperature of the produced grating. The numerical solution of the nonlinear coupled rate equation system predicts the generation of DFDL picosecond pulses. The calculated results are in good agreement with the available experimental data. The calculations were done using rhodamine 6G dissolved in ethanol as the investigated matrix.