Laser

Question 1

LASER

Answer 1

Light Amplification by Stimulated Emission of Radiation

Question 2

LED

Answer 2

Light-Emitting Diode

Question 3

SLD

Answer 3

Single Light-Emitting Diode

Question 4

Properties of Lasers

Answer 4

Light Source
Wavelength
Frequency
Energy Density
Power Density

Question 5

Class 1 Laser

Answer 5

< 0.5 mW
No Hazard

Question 6

Class 1M

Answer 6

No Hazard because of large diameter or divergent

Question 7

Class 2

Answer 7

<1 mW
Safe for momentary viewing, provokes a blink reflex

Question 8

Class 3A

Answer 8

< 5 mW
Commonly used in laser pointers
Eye hazard with prolonged exposure

Question 9

Class 3B

Answer 9

< 500 mW

Question 10

Class 3B

Answer 10

< 500 mW
Can cause permanent eye damage with brief exposure
Minor skin burns with prolonged exposure

Question 11

Class 4

Answer 11

> 500 mW
Surgical and industrial cutting lasers
Permanent eye injury, burns

Question 12

Promotes ATP, Collagen production, inflammation, and inhibits bacterial growth

Answer 12

632.8 or 670 nm

Question 13

Contraindications of lasers

Answer 13

Direct irradiation of the eyes
Malignancy
With 4-6 mos of radiotherapy
Over hemorrhaging areas

Question 14

Precautions

Answer 14

Pregnancy
Epiphyseal plates
Impaired sensation or mentation
Photophobia