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Channel Industries, 839 Ward Drive, Santa Barbara, CA 93111 (model C5400: 3 in. long, 1.625 in. in diameter, and with 0.125-in. wall thickness; strain coefficient 4.24 × 10−8∊/V).
Laser frequency shift as a function of piezovoltage V and heater current A is given byΔf(V,A)=−25GHz−(0.0094GHz/V)ΔV−(64GHz/A)ΔA,where the constant term represents the frequency offset at nominal operating conditions of 4-mA plasma tube current and 100-mA heater current (into 50 Ω). The expression for longitudinal stress on the laser plasma tube isΔσ(V,A)=−3.8MPa+(0.0021MPa/V)ΔV+(2.9MPa/A)ΔA.These expressions are not simply related because the heater current affects both the piezo and plasma tube, resulting in very little stress on the tube for a large change in frequency.
Basicon Inc., 11895 NW Cornell Road, Portland, OR 97229.
Block diagram showing the main and auxiliary (heavy dashed line) feedback loops for frequency tunable hard-sealed laser.
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