Marek Skorczakowski

Electrooptically Q-switched mid-infrared Er:YAG laser for medical applications

An actively Q-switched Er:YAG laser generating pulses at 2.94 microm has been developed and investigated. For a single Er:YAG generator at 3 Hz repetition rate, pulses of 91.2 ns duration and 137 mJ energy have been obtained. It corresponds to pulse train with high-peak power of ~ 1.5 MW. For 10 Hz repetition rate 30 mJ of output energy in single pulse has been achieved. These results, according to our knowledge, are the best world-wide achievements.

Numerical model of a Q-switched double-clad fiber laser

The time-energy characteristics of a Q-switched neodymiumdoped double-clad fiber laser are presented. Based on the proposed differential equations, a numerical model is developed to simulate this fiber laser. Using this model pulse duration and the energy of generated pulses can be predicted.

Pulsed ytterbium-doped large mode area double-clad fiber amplifier in MOFPA configuration

A pulsed master oscillator fiber power amplifier working in nanosecond range has been developed. An ytterbium-doped double-clad (large mode area) optical fiber was used as an amplifying medium. Actively Q-switched Nd:YVO laser was used as a seed of light pulses. The system worked at the repetition rate from 10 kHz to 40 kHz. At the amplifier output, pulses of 10.9 kW peak-power were achieved. The laser system worked at the slope efficiency of 30%.

Laser radiation sources applied to HpD diagnosis and therapy

The paper presents laser sets, including forsterite laser, applicable for the HpD therapy. We describe the laser sets pumped by the Q-switched Nd:YAG laser pulse, generating radiation within a therapeutic range and diagnostic one as well as the set generating within the q-W regime. We discuss the results of investigations carried out with the laser set for diagnosis. The set comprises the KZnF3 laser with a ruby pump. The forsterite laser pumped by the q-CW Nd:YAG laser, at 20 W of a pump power, can generate radiation of average power of about 400 mW at wavelength of (lambda) equals 1270 nm or radiation of average power of 150 mW at wavelength of 630 nm. The tunable range of the set is (lambda) equals +/- 20 nm FH and (Delta) (lambda) equals +/- 10 nm for the SH of forsterite laser. We have also analyzed other laser sets fulfilling requirements of the HpD diagnosis and therapy.

The Theoretical Model of Simultaneous Utilization of a Saturable Absorber as a Q-Switch and as a lasing Medium

A theoretical model of simultaneous saturable absorber Q-switched laser action in an active laser medium (LM) and laser action in saturable absorber (SA) is proposed. The new theoretical model of a double laser operation when both laser actions are coupled with SA medium is described. Results of numerical calculations are presented for a few different cases. The most important conclusions are the following: 1) simultaneous laser action in a passively Q-switched LM and in a SA is possible, 2) change of the laser beam diameter in the SA is useful in order to obtain to efficient Q-switch or to optimize the SA output, 3) LM and SA laser actions may overlap in a specific case.

30 mJ, TEM00, high repetition rate, mechanically Q-switched Er:YAG laser operating at 2940 nm

The 2940 nm Er:YAG laser Q-switched mechanically by means of a rotating mirror was developed. It generated the output pulses of up to 30 mJ energy, below 300 ns duration and record repetition rate of 25 Hz. The developed laser was effectively used for the investigation of laser beam interaction with selected organic matter simulants.

High-power Q-switched Er:YAG laser designed for medical applications

In this paper we report on a record 1.4 MW peak power, actively Q-switched Er:YAG laser operating at 2.94 μm. As a result of our experiment, at 3 Hz repetition rate, we achieved 91 ns pulses with 137 mJ energy. At higher repetition rate (10 Hz) the laser generated 100 ns pulses with 35 mJ energy. These results, according to our knowledge, are the best that have been ever achieved.

2.94 μm Electro-Optically Q-Switched Er:YAG Laser with High Output Energy

A Q-switched Er:YAG laser was developed. At 3Hz repetition rate, pulses of 91.2ns duration and 137mJ energy were obtained. For 10Hz repetition rate 30mJ of output energy in single pulse was achieved.

High-power diode-pumped Yb-doped silica fiber laser generating in near-infrared range

In this paper high power Yb-doped double-clad fiber laser is presented. A Yb3+-silica fiber laser has been cladding pumped at 937 nm by a InGaAs semiconductor laser diode and operated with the slope efficiency of 73 ± 3% with respect to the incident pump power. We obtained 4 W cw-output power when working with 20-m long fiber with laser core in 7 μm diameter (cut-off wavelength - 1 μm) and pump core in 120 x 120 μm (rectangle-shaped, NA = 0.6). Yb-doping concentration has been at the level 3 - 10 • 1019 cm-3 and attenuation in laser core has been 8 - 12 dB/km. The fiber laser operated at 1084 nm.

Ophthalmological LH-58 set with the holmium laser

The paper presents a description of a construction of the ophthalmological set LH-58 with the holmium laser. Results of preliminary medical tests of eye lens curvature correction carried out by means of this set are given.