FINAL EXAM Do any 10 of the 11 problems. 11. sure to cross out the problem you d
ID: 1318397 • Letter: F
Question
FINAL EXAM Do any 10 of the 11 problems. 11. sure to cross out the problem you do not you try all be want graded. 1.) Many laser systems can produce several different wavelengths of light. As an example, the Neon can be manufactured to produce ora green and infrared light as well as the 'standard" red laser output. Some lasers can be made so the user can select among the several possible wavelengths a) When designing building a laser to output just one of its possible wavelengths (i e, building a green HeNe laser), how would you go about building it to select the single wavelength you want the laser to produce? b) When designing building a laser to have the user select between its possible output wavelengths (i e, building an Argon ion laser so the user can select one of its 5 possible blue and green output wavelengths), how would you go about building it so the user can select the wavelength they want the laser to produce?Explanation / Answer
1.
GREEN (543.5 nm) HELIUM NEON LASERS
Helium Neon lasers operating at 632.8nm (red) wavelength. The Green HeNe laser operating at 543.5nm wavelength.
Shelf Life : 10 years
Operating Life : 22,000 hours
These lasers incorporate patented symmetrical cathode design that provides exceptional pointing stability. Precision moulded preform frit seal is used for reliable zero-leak hard seals. A zirconium aluminium alloy getter is activated to remove trace gas residues.
Mode : TEMoo,
Beam Dia : 1.0mm,
Beam Div : 1.0mrad.
For cylindrical laserheads (where power supply is separate), kinematic mount is avalable as option. Otherwise, choose Self-contained models as shown in the photograph at right.
Further, besides Green, other models are available in Red, Yellow and Orage colours. They serve as low cost sources of well-defined monochromatic wavelengths so very useful for studying characteristics of optical elements and materials using either the reflective or the transmissive properties.
Beam Dia. : < 3 mm.
Beam Divergence : < 1.2 mrad.
Input Operating Voltage : 230 V / 50 Hz mains.
2.--------------------------------------------------------------------------------------------------------------
RED (632.8 nm)
lasers operating at 632.8nm (red) with nominal output powers of : 2.0 mW, 5.0 mW, and 7.0 mW. Special features include :
Shelf Life : 10 years
Operating Life : 22,000 hours
These lasers incorporate patented symmetrical cathode design that provides exceptional pointing stability. Precision moulded preform frit seal is used for reliable zero-leak hard seals. A zirconium aluminium alloy getter is activated to remove trace gas residues.
Mode : TEMoo, Beam Dia : 1.0mm, Beam Div : 1.0mrad. Choice of polarization : Random or Linear.
For cylindrical laserheads (where power supply is separate), kinematic mount is avalable as option. Otherwise, choose Self-contained models as shown in the photograph here.
Further, besides Red, other models are available in Green, Yellow and Orage colours. They serve as low cost sources of well-defined monochromatic wavelengths so very useful for studying characteristics of optical elements and materials using either the reflective or the transmissive properties.
YELLOW (594.1nm) & ORANGE (611.9nm)
lasers operating at 632.8nm (red) and 543.5nm (green) wavelengths. The Yellow Helium Neon laser operating at 594.1nm (one milliwatt) and the Orange Helium Neon laser operating at 611.9nm (two milliwatts) are now offered. Special features include :
Shelf Life : 10 years
Operating Life : 22,000 hours
These lasers incorporate patented symmetrical cathode design that provides exceptional pointing stability. Precision moulded preform frit seal is used for reliable zero-leak hard seals. A zirconium aluminium alloy getter is activated to remove trace gas residues.
Mode : TEMoo, Beam Dia : 1.0mm, Beam Div : 1.0mrad.
Laser head has a choice of square and cylindrical shape. Also available in self-contained model of dimension 470 x 105 x 100 mm.
The advantages of these lasers are that of being low cost sources of well-defined monochromatic wavelengths so very useful for studying characteristics of optical elements and materials using either the reflective or the transmissive properties.
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