Abstract

During recent years pulsed CO2 lasers for fusion research have been under construction in the I. V. Kurchatov Institute of Atomic Energy and the D. V. Efremov Electro-Physical Apparatus Institute. Efforts are being concentrated at present on two approaches: (1) microsecond laser pulse plasma heating in solenoids and θ pinches (UTRO system) and (2) nanosecond CO2 laser utilization for inertial confinement fusion. The TIR-1 system was created to develop nanosecond CO2 laser technology and to study laser–target interaction at 10 μm. This system is designed to deliver ~1-kJ energy in one beam of ~1-nsec duration. The TIR-1 system consists of an oscillator–preamplifier system that produces an ~1-nsec laser pulse with an energy contrast ratio of ~106, a large-aperture (30 × 30-cm2) triple-pass amplifier capable of providing ≈1 kJ in a 1-nsec pulse, a target chamber with diagnostic equipment, and associated engineering systems.

© 1980 Optical Society of America

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Figures (13)

Fig. 1
Fig. 1

Optical schematic of the oscillator–preamplifier system.

Fig. 2
Fig. 2

OPS output pulse shape.

Fig. 3
Fig. 3

Laser pulse duration dependence on pure CO2 pressure (resonator length 75 cm).

Fig. 4
Fig. 4

Gain-switched pulse FWHM dependence on N2 content in the laser mixture (total mixture pressure, 3 atm; resonator length, 40 cm).

Fig. 5
Fig. 5

Gain-switched pulse FWHM dependence on He content in a laser mixture (total mixture pressure, 3 atm).

Fig. 6
Fig. 6

Laser energy vs discharge energy for the following mixtures: CO2:N2:He = 4:1:4 (○); CO2:N2:He = 4:1:8 (△); CO2:N2:He = 4:1:12 (●).

Fig. 7
Fig. 7

Schematic diagram of a final amplifier stage.

Fig. 8
Fig. 8

Optical schematic of the triple-pass amplifier.

Fig. 9
Fig. 9

Gas isolator mixture spectrum.

Fig. 10
Fig. 10

Bleaching of the isolator gas mixture by a 2-nsec laser pulse.

Fig. 11
Fig. 11

Small-signal gain coefficient dependence on the initial discharge voltage for the final amplifier stage (see text for comments). Curve 1, +; curve 2, □; curve 3, ○; curve 4, △.

Fig. 12
Fig. 12

Small-signal gain coefficient distribution across the aperture of the final amplifier stage (see text for comments). Curve 1, △; curve 2, □.

Fig. 13
Fig. 13

Small-signal gain time dependence for the final amplifier stage.

Equations (1)

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r G = 1 - ( 1 - r Al ) / exp { 2 l [ g 0 ( G ) - g 0 ( Al ) ] } .

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