Laser apparatus

Details Laser apparatus Laser apparatus

1996-02-22

1997-05-20

Scott, Jr., Leon

Coherent light generators

Particular temperature control

Liquid coolant

372 34, 372 33, 372 38, H01S 304

Patent

active

056319177

ABSTRACT:
To adapt temperature control of a secondary cooling water to the temperature of a primary cooling water: A control apparatus computes duty factor D from measured open time period T.sub.ON and closed time period T.sub.OFF of a solenoid valve (step B3) for each cycle of the solenoid valve operation (step B2). The apparatus classifies the computed duty factor into one of a plurality of predetermined ranges and conditionally updates the reference temperature Pt of the secondary cooling water based on the classification (B5, B6, B7). If the reference temperature has reached an upper limit P.sub.MAX and if the duty factor has exceeded an upper limit, e.g., 95 percent (B8), the apparatus stops the operation of a laser oscillator and provides an alarm.

REFERENCES:
patent: 4507789 (1985-03-01), Daly et al.

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