Output Power Of Dye Laser Research Articles

Characterization and optimization of a homemade ring dye laser

ObjectivesThe characteristics of dye laser such as purity, concentration and dye solvent velocity have significant effects on the output power of laser. The main objective was to investigate the effects of the dye solvent velocity on the laser output power. Methods/Statistical analysisA homemade ring dye laser (Rhodamine 6G) was used and the liquid dye was injected by a liquid jet and pumped by beam of a 6W argon ion laser (λ=488nm). By using mechanical pumping, the liquid pressure was controlled and different velocities were selected. FindingsIt was observed that by increasing the pressure, the output power of dye laser, was increased initially and then in a certain pressure variation region (0.65–0.69MPa), some slight changes were detected. By increasing more dye liquid pressure, the laser output was decreased considerably. The maximum output laser power obtained in a wavelength ranges within 5702–6072Å, was approximately 140mW. It was seen that by increasing the pumping power, the dye laser output power was increased. Moreover, for each specific wavelength, there was a threshold power (in pumping laser) for dye laser emission in order to be initiated. For example for the laser emission at 5763Å and 5990Å, the minimum pumping laser powers are ~4.1 and 5.2W, respectively. Dye solvent velocity in output power of dye laser is not appropriately discussed in previous studies, so it can be stated that in the current study, it was carried out with different conditions. Application/ImprovementsApplying suitable dye solvent velocity is one of the important issues in designing ring dye laser that has been correctly discussed and utilized in the current study.

Study of a new dye cell for a high repetition rate dye laser

In this paper, performance of a transversely pumped high repetition rate narrow spectral width tunable dye laser, which makes use of a very simple dye cell, has been investigated. The dye cell is made of a single piece glass tube, which is free from edges and additional holder for windows as generally used in dye cells. The scheme essentially involves the pinching of glass tube in such a way that smooth profile for liquid flow exists near the optical pumping region. This ensures the minimization of dye solution flow induced instabilities near the dye laser axis. The performance of this dye cell was evaluated by using it in a dye laser system having narrow linewidth dispersive resonator, pumped by a high repetition rate copper vapor laser, by means of the Fabry–Perot interferometer setup. The dye laser spectral stability was within ±5% over the observation period of 75min. The efficiency of the dye laser with uncoated optics was reasonably good. The output power of dye laser was also fairly steady over the observation period of more than an hour.

Studies on 20 kHz pulse repetition rate class narrow line-width dye laser

This paper presents a first comprehensive study on 20kHz pulse repetition rate (PRR) class dye laser with an emphasis to bring out the role of dye solution flow rate on the laser power, line-width, wavelength stability and pulse characteristics of a narrow line-width dye laser. The study was performed for Rh6G–ethanol dye solution for flow rates from 2 to 12lpm. The dye laser based on glass dye cell and the pump source was copper hydrogen bromide (Cu–HBr) laser at a fixed average power of 8W and repetition rate of 18kHz. The dye laser resonator was grazing incidence grating (GIG) cavity with double prism beam expander. A high precision wavelength-meter was used to record the online variation in dye laser line-width and wavelength. It is established that the dye solution flow rate significantly affected the dye laser performance. The best dye laser spectral purity was obtained at 3–4lpm flow rate regime. The line-width and wavelength stability worsened both below and above the flow rates of 3–4lpm. The best dye laser output power was obtained at 9lpm flow rate and it decreased only slightly as flow rate is increased to 12lpm. The dye solution flow rate also affected the dye laser pulse shape and width.

Pump polarization effects in cw dye lasers

The effects of pump polarization on the performance of cw dye lasers have been investigated. A recently developed semiclassical model for synchronously pumped mode-locked dye lasers is adapted to the problem of cw dye-laser oscillation, and analytic expressions are obtained for the relationship between the pump power, pump polarization, and dye-laser output power. The theoretical results are compared with experimental data obtained using an argon-laser-pumped rhodamine 6G dye laser.

Optically biased tunable femtosecond dye laser and spectral windowing of the compressed second harmonic of Nd:YAG

We describe a technique for enhancing tunable ultrashort pulse pumped dye laser performance based on the use of "long" pump pulses to optically bias the cavity toward minimal losses. Increases in dye laser output power of 155 percent and powers as high as 125 mW have been measured with pulse durations under 300 fs. Optical pulses as short as 180 fs are reported for this ultrashort pulse pumped dye laser oscillator. We also report the first measurements of the spectral windowing of compressed 532 nm pulses for temporal pulse shaping, in the optimal group velocity dispersion limit. Temporal pulse shaping is demonstrated with small losses in power and minimal pulse broadening.

Powerful single-frequency ring dye laser spanning the visible spectrum

With an improved water-base dye solvent and 24-W all-lines pumping from an argon laser, we have generated 5.6 W of stabilized single-frequency output from a ring laser in rhodamine 6G dye. With this solvent, a mixture of ammonyx-LO and ethylene glycol chilled to 10 degrees C, thermal distortion of the jet no longer limits the dye laser output power, and the tuning curves reported here are all limited by available pump input levels. This single-frequency system has been optimized over the entire visible spectrum (407-887 nm), and results for the eleven best dyes are presented.

Power stabilization method for a synchronously-pumped dye laser system

The average power stability of the synchronously-pumped dye laser can be improved by a factor of more than 5 by altering the optical feedback stabilization circuitry of the conventional laser system. Noise fluctuations in dye laser output power which normally occur are largely eliminated by changes in the pumping power of the ion laser. The slight loss in dye laser output power which is incurred by the beam splitter is largely offset by an increase in available ion laser power.

Notizen: Triplet Quenching by Oxygen in a Rhodamine 6G Laser

Measurements of dye laser output power vs. oxygen content of the dye solution are reported and compared with a simple theoretical model. The triplet lifetime of rhodamine 6G in oxygen-free methanol at room temperature is seen to lie between 1 and 100 μsec, with 2 μsec giving the best fit of the experimental data.