Laser Biophysics

Question 1

L.A.S.E.R

Answer 1

Light
Amplification
By Stimulated
Emission
Of Radiation

Question 2

Light

Answer 2

Recognized by its wavelength and wavelength is measured in nanometers

Question 3

Ionizing radiation.

Answer 3

Gamma Rays, X-Rays, Ultraviolet light
1-399 nm
Cancer causing

Question 4

Aesthetic laser wavelength

Answer 4

400-780nm visible light
Fitz 1-3

Question 5

Laser Medium

Answer 5

Stagnant lighy passes through the medium gives you the wavelength which allows you to go deep, shallow, in between. True lasers have mediums

Question 6

4 types of mediums

Answer 6

Solid
Liquid
Gas
Semiconductor

Question 7

Solid

Answer 7

Ruby 694 nm
Alexandrite 755 nm
Nd:YAG 1064 nm
Erbium YAG 2940 nm

Question 8

Liquid

Answer 8

Pulsed Dye Laser
Rhodamine 585 nm (PDL)

Question 9

Gas

Answer 9

Argon 510 nm
Carbon Dioxide 10,600 nm

Question 10

Semiconductor

Answer 10

Diode 810 nm
Not solid

Question 11

Two types of delivery systems

Answer 11

Fiber optic
Articulating arm

Question 12

True light qualities

Answer 12

Coherent
Monochromatic
Collimated

Question 13

Intense Pulsed Light

Answer 13

Non collimated
Polychromatic
Non coherent

Question 14

Wavelength

Answer 14

Nanometers (NM)=depth in skin

Question 15

Fluence

Answer 15

Joules (J)=power/energy/“heat” - turn it up

Question 16

Absorption coefficient (AC)

Answer 16

Targeted chromophore(TC)= selective photothermalysis = target-light, heat, destroy

Question 17

Pulse Duration

Answer 17

Pulse width=time in the tissue/distance between peaks (crests) of heat (epidermal cooling=millisecond (ms), nanoseconds (ns), or picoseconds (ps)

Question 18

What makes laser light unique?

Answer 18

Collimated
Coherent
Monochromatic
More damaging to eyes

Question 19

Pulsed Light Systems

Answer 19

Polychromatic
Divergent, Non-Coherent
Less Damaging to the eye

Question 20

For laser energy to produce any biological effect in skin, it must be absorbed

Answer 20

TRUE

Question 21

When matter is exposed to light the following actions must take place

Answer 21

Scattering- deviations fro straight path by inconsistency in medium
Transmission-
Absorption-
Reflection

Question 22

Chromo=COLOR PHORE=carrier
4 main components of skin that selectively absorb laser light

Answer 22

1. Melanin (pigment) - hair, age spots, freckles
2. Hemoglobin (blood) - spider veins, rosacea, vascular birthmarks
3. Water (wrinkles)- Intra and Extra cellular water
4. Tattoo ink

Question 23

Targeted Chromophore

Answer 23

Intended target of the laser treatment
Melanin for laser hair reduction

Question 24

Competing Chromophore

Answer 24

A Chromophore in the treatment area that is a competing target for the laser. Melanin in the skin is a competing chromophore when performing LHR

Question 25

Chromophore Sheilding

Answer 25

Intended targeted chromophore is shielded by another chromophore. Tattoo pigment

Question 26

Selective Photothermolysis
PHOTO= LIGHT THERMO= HEAT LYSIS=DESTRUCTION

Answer 26

Process of selectively delivering thermal injury to a specific target based on its absorption characteristics while allowing the surrounding tissue to remain un damaged