Laser

What component would you use to (choose from the list on thefollowing page)

1._______________separate a gas from a vacuum but allow light totravel from one to the other with little or no effect on thelight

2._______________direct a beam back in the direction from whichit came

3._______________place in a laser cavity to limit output to asingle longitudinal mode

4._______________\"correct\" a beam with an oval cross section,creating a circular cross section

5._______________filter all visible wavelengths by the sameamount

6._______________pass only a narrow band of wavelengths in abeam of light

7._______________allow visible light to pass, but reflect IR

8._______________remove optical noise from a beam to produce asmooth, clean spot of light

9._______________prevent reflection from an optical element

10.______________pass all wavelengths except for a narrowband

11.______________create polarized light without the use of apolarizing filter

12.______________reduce or eliminate the divergence of a laserbeam

13_______________ create long duration pulses from a cw laserbeam

14_______________change the wavelength of light to half itsprevious value

15_______________change the wavelength of light by scattering inan optical fiber

16_______________divide a beam into two parts

17_______________ create circularly polarized light fromlinearly polarized light

18_______________ create a short laser pulse with high peakpower

19_______________create a train of femtosecond (really, reallyshort) pulses

20_______________rotate the direction of polarization using avoltage controlled device

LIST OF LASER ACCESSORIES

1. hot mirror
2. ND filter
3. spatial filter
4. AR coatings
5. narrow band transmission filter
6. notch filter
7. collimator, or telescope
8. retroreflector
9. Beam splitter
10. Window
11. Brewster window
12. retarder (wave plate)
13. etalon
14. Cylindrical lens
15. Pockels cell
16. second harmonic generation (SHG) crystal
17. mechanical chopper
18. Q switch
19. mode locker
20. Cascaded raman resonator