Font Size: a A A

Theoretical Lnvestigation On The Tuning Characteristics Of High Power TE(A) CO2 Lasers

Posted on:2002-07-23Degree:DoctorType:Dissertation
Country:ChinaCandidate:J WuFull Text:PDF
GTID:1118360032951968Subject:Physical Electronics
Abstract/Summary:PDF Full Text Request
In this paper, we deduced the six-temperature mode rate equations that can be applied to one or multi-frequency oscillation in a tunable TE(A) CO2 laser. By using these equations, the frequency-tuning characteristics of TE(A) CO2 lasers, using such techniques as grating, F-P modulator, or injection locking, can be investigated theoretically.Also, in this paper, a mathematical mode was set up to derive the pumping electron density from the laser discharge circuit. With all relevant collision cross-section data of C02-N2-He-CO molecules, the relationship of the electron collision ionization coefficient, electron-neutral particle attachment coefficient and electron drift velocity with the discharge parameter F/N could be obtained by solving Boltzmann equation, so the time evolution of the pumping electron density in any given laser discharge circuit could be solved numerically. For instance, the evolution of laser discharge voltage, current and pumping electron density, either in a CLR discharge circuit or a PFN discharge circuit, was studied in detail under different gas mixtures and pressures.In a word, we solved the correlation problem of the rate equations of a TE(A) CO2 laser and its actual discharge pumping circuit, and established a frequency-tuning theory systematically. As examples, we thoroughly investigated the tuning characteristics of a high power tunable TE(A) CO2 laser using grating, F-P modulator or injection locking tuning and obtained many valuable theoretical results. Some experiments were also carried out on a high power tunable TEA CO2 laser, which showed good agreement with the theoretical analyses.
Keywords/Search Tags:Tunable TE(A) CO2 lasers, Six temperature mode, Rate equations, Pumping electron density, Grating, F-P modulator, Injection locking, Pulse forming network (PFN)
PDF Full Text Request
Related items