Powerful single-frequency CO2 laser for plasma diagnostics

Hidemi Takahashi, Minoru Kimura, Yasuyuki Morita, Reiji Sano

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

A cw 240-W CO2 laser has been developed for plasma scattering measurements. The laser oscillates only on the 10P(20) transition (10.5912-μm wavelength) at a single longitudinal as well as transverse mode with linear polarization. These properties are obtained by using an adequately long cavity with a folded beam configuration. Part of the output beam was heterodyned with a local oscillator laser to confirm the single-frequency oscillation. The short-term frequency stability was 200 kHz (7×10-9) for an observation time of 1/15 s. The shift of the oscillating frequency due to the discharge current was 360 kHz/mA and the frequency shift due to the total gas pressure was 4.1 MHz/Torr. These frequency shifts are mostly attributable to the change of the refractive index of the laser gas.

Original languageEnglish
Pages (from-to)1632-1635
Number of pages4
JournalReview of Scientific Instruments
Volume55
Issue number10
DOIs
Publication statusPublished - 1984
Externally publishedYes

ASJC Scopus subject areas

  • Instrumentation

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