Temperature-dependent absorptivity and cutting capability of CO{sub 2}, Nd:YAG and chemical oxygen-iodine lasers
- Univ. of Central Florida, Orlando, FL (United States)
- Philips Lab., Kirtland AFB, Albuquerque, NM (United States)
The most widely used high power industrial lasers are the Nd:YAG and CO{sub 2} lasers. The chemical oxygen iodine laser (COIL), whose wavelength (1.315 {micro}m) is between that of the Nd:YAG (1.06 {micro}m) and CO{sub 2} (10.6{micro}m) lasers, is another high power laser for industrial applications. The cutting capability of these lasers is investigated in this paper. The cut depth strongly depends on the absorptivity of the cut material, kerf width and cutting speed. The absorptivity is an unknown parameter for which experimental data at high temperatures are currently unavailable. Theoretical values of the absorptivities of various metals are obtained using the Hagen-Ruben relationship. It is found that the absorptivity of a metal is linearly proportional to the square root of its resistivity and also inversely proportional to the square root of the wavelength. The absorptivities of the COIL and Nd:YAG lasers are 2.84 and 3.16 times larger than that of the CO{sub 2} laser, respectively. Based on these theoretical values of the absorptivity, the cut depths for several metals are analyzed at various laser powers and cutting speeds for these lasers. For identical cutting parameters, the cut depths for stainless steel and titanium are deeper than those of most other metals. Due to the wavelength dependence of the absorptivity, the cut depths for COIL and Nd:YAG lasers are expected to be 2.84 and 3.16 times deeper than that for the CO{sub 2} laser.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 477277
- Journal Information:
- Journal of Laser Applications, Vol. 9, Issue 2; Other Information: PBD: Apr 1997
- Country of Publication:
- United States
- Language:
- English
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