Homework Answers
Q9)option d is false , radiation emitted by CO2 laser does not propagate well in optical fibre .because it requires a beam transfer method using a mirror its flexibility is lower than using a solid state laser, such as Nd: YAG laser which adopts a fiber-optic cable.
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These compoun is controlled by the energy gap separating the bands Question 9 (1 point) Which...
9. Which of the following statements is false? a) Ho: Yag laser is used in lithotripsy...
9. Which of the following statements is false? a) Ho: Yag laser is used in lithotripsy b) Kr laser can be used in photodynamic therapy to excite exogenous fluorophores c) Alexandrite lasers can be used for tattoo removals d) Radiation emitted by the CO2 laser propagates well in all optical fibers e) radiation emitted by Er: Yag lasers are strongly absorbed by water
10. Which of the following statements is correct? a) large amount of heat is applied during...
10. Which of the following statements is correct? a) large amount of heat is applied during biostimulation b) exogenous fluorophores are never used in photodynamic therapy c) process of stimulated emission has never been applied in laser d) ArF lasers emit beams at a wavelength = 193 nm and they cannot be focused to very small spots e) Er: Yag has never been used clinically to smash calculi
Question 19 (1 point) Which of the following statement is false? The process of fluorescence is...
Question 19 (1 point) Which of the following statement is false? The process of fluorescence is used when exciting exogenous fluorophores Er:Yag laser radiation is strongly absorbed by tissue The penetration of Er:Yag laser is very small in tissue FREDDY Nd:Yag can be used in lithotripsy Ho:Yag cannot be used in lithotripsy.
Question 31 (2 points) Which of the following statement is false? Er:Yag and CO2 lasers can...
Question 31 (2 points) Which of the following statement is false? Er:Yag and CO2 lasers can vaporize tissue because they strongly absorbed in tissue He-Ne is often used in biostimulation to raise tissue temperature around 40°C Argon and Nd:Yag are the lasers of choice to stop bleeding Nd:Yag laser can be efficient in the treatment of capsulotomy Er:Yag and CO2 laser can be used to correct the curvature of the cornea Question 32 (1 point) Which of the following statement...
Question 33 (1 point) Which two amongst the five following statements are true? 1) Nd:Yag lasers...
Question 33 (1 point) Which two amongst the five following statements are true? 1) Nd:Yag lasers penetrate deeply into skin because they are not absorbed much by tissue 2) Nd: Yag is the ideal laser to use to correct the cornea 3) Er:Yag lasers are not absorbed at all by tissue 4) Argon lasers are very efficient to smash stones in lithotripsy surgery 5) The Ruby laser was the first laser that was invented 1) and 5) 2) and 3)...
Question 6 (1 point) Five groups of three different lasers are listed below. Which group is...
Question 6 (1 point) Five groups of three different lasers are listed below. Which group is listing three lasers emitting in the visible spectrum? Nd:Yag, ArF, excimer laser Ruby, Nd:Yag, He:Ne Argon, Ruby, KrF Alexandrite, Er:Yag, CO2 Ruby, Argon, He:Ne Question 7 (2 points) The incident radiation intensity entering the material that is used to make a pair of safety glasses is 107 W/cm2 and the intensity of the radiation measured after transmission is 1W/cm2. What is the optical density...
Question 13 (1 point) Calculate the relaxation time for the pulsed laser as described in question...
Question 13 (1 point) Calculate the relaxation time for the pulsed laser as described in question 12. Use K - 10-3 cm2 / 5 and a = 15000 cm 1 16.7 ms 16.7 us 1.1 us 1.1 ms None of the other answers
Question 17 (1 point) Which of the following statements makes sense during eye surgery on the...
Question 17 (1 point) Which of the following statements makes sense during eye surgery on the retina? CO2 lasers should be used as they emit at a long wavelength and they are focused on a larger spot size Arf lasers are good laser to use because they emit at short wavelength Er: Yag laser emitting at 3 um should be used A laser with a good penetration in aqueous media is desirable Any laser focused on the cornea can be...
Question 19 (1 point) Which of the following statement is false? The process of fluorescence is used when exciting exogenous fluorophores Er:Yag laser radiation is strongly absorbed by tissue The penetration of Er:Yag laser is very small in tissue FREDDY Nd:Yag can be used in lithotripsy Ho:Yag cannot be used in lithotripsy.
Question 31 (2 points) Which of the following statement is false? Er:Yag and CO2 lasers can vaporize tissue because they strongly absorbed in tissue He-Ne is often used in biostimulation to raise tissue temperature around 40°C Argon and Nd:Yag are the lasers of choice to stop bleeding Nd:Yag laser can be efficient in the treatment of capsulotomy Er:Yag and CO2 laser can be used to correct the curvature of the cornea Question 32 (1 point) Which of the following statement...
Question 33 (1 point) Which two amongst the five following statements are true? 1) Nd:Yag lasers penetrate deeply into skin because they are not absorbed much by tissue 2) Nd: Yag is the ideal laser to use to correct the cornea 3) Er:Yag lasers are not absorbed at all by tissue 4) Argon lasers are very efficient to smash stones in lithotripsy surgery 5) The Ruby laser was the first laser that was invented 1) and 5) 2) and 3)...
Question 6 (1 point) Five groups of three different lasers are listed below. Which group is listing three lasers emitting in the visible spectrum? Nd:Yag, ArF, excimer laser Ruby, Nd:Yag, He:Ne Argon, Ruby, KrF Alexandrite, Er:Yag, CO2 Ruby, Argon, He:Ne Question 7 (2 points) The incident radiation intensity entering the material that is used to make a pair of safety glasses is 107 W/cm2 and the intensity of the radiation measured after transmission is 1W/cm2. What is the optical density...
Question 13 (1 point) Calculate the relaxation time for the pulsed laser as described in question 12. Use K - 10-3 cm2 / 5 and a = 15000 cm 1 16.7 ms 16.7 us 1.1 us 1.1 ms None of the other answers
Question 17 (1 point) Which of the following statements makes sense during eye surgery on the retina? CO2 lasers should be used as they emit at a long wavelength and they are focused on a larger spot size Arf lasers are good laser to use because they emit at short wavelength Er: Yag laser emitting at 3 um should be used A laser with a good penetration in aqueous media is desirable Any laser focused on the cornea can be...
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