Laser output measuring apparatus

Details Laser output measuring apparatus Laser output measuring apparatus

1999-02-19

2000-02-08

Paschall, Mark

Electric heating

Heating devices

With power supply and voltage or current regulation or...

H05B 102

Patent

active

060230533

ABSTRACT:
A laser beam LB, which has entered a housing, travels via a reflection mirror and through a beam diffusion plate, ND filters 42 and a visible rays cut-off filter 44 to impinge on a beam receiving surface of a photodiode 46. A resistance heating element 48 in the form of, e.g., a metal film resistor and a power transistor 50 for the supply of electric power to the resistance heating element 48 are fixedly secured by bolts via respective insulating sheets with thermal conductivity to external wall surfaces of thick sidewalls 28d and 28e of a thermally conductive second retainer 28. The second retainer 28 is heated by both heat generated by the resistance heating element 48 and heat generated by the transistor 50. The second retainer 28 is provided also with a temperature sensor 52. A temperature control circuit accepts an output signal from the temperature sensor 52 and provides control of an output signal from the transistor 50 so as to allow the temperature of the second retainer 28 to conform to a set temperature.

REFERENCES:
patent: 4413446 (1983-11-01), Rogers
patent: 4440506 (1984-04-01), Eitel
patent: 4865446 (1989-09-01), Inoue et al.
patent: 5156459 (1992-10-01), Baker

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