Programmable power supply for a CO2 laser used in the tissue ablation

Andreea Rodica Sterian; Claudia Laurenta Popescu; Mihai C. Piscureanu

doi:10.1117/12.519082

4 November 2003 Programmable power supply for a CO₂ laser used in the tissue ablation

Andreea Rodica Sterian, Claudia Laurenta Popescu, Mihai C. Piscureanu

Proceedings Volume 5226, 12th International School on Quantum Electronics: Laser Physics and Applications; (2003) https://doi.org/10.1117/12.519082
Event: 12th International School on Quantum Electronics Laser Physics and Applications, 2002, Varna, Bulgaria

Abstract

A power supply for a CO₂ laser used in the tissue ablation capable to control the laser emission in the superpulse operation having a well established waveform was designed. The minimal configuration of the apparatus has four blocks: the DC/DC converter having an improper transfer factor, the electronic commutator for laser pulses control, the network for pulse forming and the controller. The DC/DC converter of the resonant type, having the pulse width modulation (PWM) uses the forced commutator to control the voltage and the current in the transfer process of the power and the stabilization of the laser. It is composed of a resonant half-bridge inverter with serial resonant circuit and an AC/DC class E converter. The commutator of saturable inductor type is based on the B-H characteristics of a ferromagnetic material. The magnetic compression of pulses is realized by a LC elements network, every element being realized by a saturable inductor and one shunt capacitor. A pulse forming network of π type composed of saturable inductor and capacitor is used to match the high voltage supply and the laser tube impedance. For dc operation this circuit represents a LC low pass filter but for pulse operation it is a charge transfer circuit. The controller supervises the inverter and commutator operation, by specific signals from operator (microprocessor), having a structure suited for programmable operation of the CO₂ lasers. Two different error amplifier digitally controlled are used in the feedback loop circuits for the current and the voltage, respectively. By optimization of this modular structure of the power supply, three modes of operation of the power supply (dc, repetitive pulses and super pulses) are ensured in the ablation experiments of the tissues.

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Andreea Rodica Sterian, Claudia Laurenta Popescu, and Mihai C. Piscureanu "Programmable power supply for a CO₂ laser used in the tissue ablation", Proc. SPIE 5226, 12th International School on Quantum Electronics: Laser Physics and Applications, (4 November 2003); https://doi.org/10.1117/12.519082

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KEYWORDS

Pulsed laser operation

Power supplies

Carbon dioxide lasers

Laser ablation

Capacitors

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