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Syneron-Candela > Laser Physics > Flashcards

Laser Physics Flashcards

0
Q

What are the three principles of aesthetic lasers?

A
  1. Selective Photothermolysis
  2. Pulse Duration
  3. Thermal Relaxation Time
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1
Q

What does LASER stand for?

A 
Light
Amplification be the
Stimulated
Emission of
Radiation
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2
Q

What is TRT?

A

Thermal relaxation time

The TRT is the time necessary for target tissue to lose 50% of its heat to surrounding tissue due to thermal diffusion.

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3
Q

What are the basic elements needed to achieve SPTL?

A
  1. A wavelength that reaches and preferentially is absorbed by the desired target.
  2. A pulse duration equal to or less than the TRT.
  3. Sufficient fluence to reach a damaging temperature in the target.
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4
Q

532?

A

KTP laser & frequency doubled Nd:Yag.

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5
Q

694?

A

Ruby laser.

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6
Q

755?

A

Alexandrite laser.

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7
Q

1064?

A

Nd:YAG laser.

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8
Q

2940?

A

Er:YAG laser.

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9
Q

10600?

A

Co2 laser.

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10
Q

577-630?

A

Dye laser.

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11
Q

190-390?

A

Excimer laser.

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12
Q

488-514?

A

Argon laser.

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13
Q

What are the 4 components of a laser?

A
  1. Medium
  2. Optical cavity
  3. Power supply
  4. Delivery system
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14
Q

What are the three properties of laser light?

A
  1. Monochromacity- all of the photons are the same wavelength
  2. Collimated- all of the photons are traveling parallel
  3. Coherent-all of the light waves are in phase
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15
Q

What does spot size measure?

A

The size of a laser beam in diameter.

16
Q

What is fluence?

A

The amount of energy delivered into a tissue over a certain area. Noted as:

Fluence=Joules/cm^2

17
Q

What determines the depth of penetration?

A

Wavelength and the chromophore.

18
Q

What are the three main chromophores?

A
  1. Oxy-hemoglobin (red)
  2. Melanin (brown)
  3. Water
19
Q

What procedures target hemoglobin?

A
  1. Hair removal

2. Vascular lesions

20
Q

What procedures target melanin?

A
  1. Hair removal

2. Pigmented lesions

21
Q

What procedures target water?

A
  1. Body contouring
  2. Resurfacing
  3. Rejuvenation
  4. Tightening
22
Q

810?

A

Diode laser.

23
Q

What is the TRT for fine hair?

A

10-30ms

24
Q

What is the TRT for course hair?

A

60-100ms

25
Q

What are the four elements of system power?

A
  1. Spot size
  2. Repetition Rate
  3. Pulse duration
  4. Fluence
26
Q

What determines a laser’s rep rate?

A

Hertz.

27
Q

Which two elements of laser power are almost always preset?

A

Spot size and rep rate.

28
Q

Which two elements of lasers vary?

A

Pulse duration and Fluence

Syneron-Candela (3 decks)

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