Unit 2: Lasers

Question 1

Round-trip reduction factor

Answer 1

Question 2

Stimulated Emission Rate

Answer 2

Question 3

Absorption Rate

Answer 3

Question 4

Photon Number Rate (Reduction Rate)

Answer 4

Question 5

Gain Coefficient

Answer 5

Question 6

For the gain coefficient equation, if … what do we have?

Answer 6

Question 7

Fundamental form of gain coefficient equation

Answer 7

Question 8

Emission Cross-Section

Answer 8

Question 9

Stimulated Emission Rate in terms of “A” Einstein Coefficient

Answer 9

Question 10

“A” Einstein Coefficient relation to Spontaneous Emission Time constant and “B” Einstein Coefficient
- Equation string

Answer 10

Question 11

Ratio of Spontaneous to Stimulated Emission
- Equation String

Answer 11

Question 12

Temporal coherence of a light source
(Coherence time constant)

Answer 12

Question 13

Coherence Length

Answer 13

Question 14

Key laser equation

Answer 14

Question 15

Steady State Condition

Answer 15

Question 16

For Key Laser Equation:
- with no photons in the cavity

Answer 16

Question 17

Reminder:

Answer 17

(Don’t know how to format this derivation)

Question 18

Threshold gain requirement

Answer 18

Question 19

Optical Path Length

Answer 19

Question 20

Frequencies
- “counting integer” p

Answer 20

Question 21

Separation of Nodes

Answer 21

Question 22

Level of gain coefficient required for a specific cavity

Answer 22

Question 23

Optical cavity lifetime

Answer 23

Question 24

Quality factor of cavity, Q

Answer 24

Question 25

Resonant width of cavity

Answer 25

Question 26

Frequency

Answer 26

Question 27

Answer 27

Question 28

Lineshape function

Answer 28

Question 29

Standard Deviation

Answer 29

Question 30

FWHM

Answer 30

Question 31

Answer 31

Question 32

Answer 32

Question 33

Show that for an electrostatic transition E_2 to E_1, the small signal gain of a laser can be written as:

Answer 33

Question 34

Definitions for all terms in the expression:

Answer 34

Question 35

What is meant by the term **Cavity Time Constant** - Definition - Equation

Answer 35

Question 36

What is meant by the term **Cavity Q Factor** - Definition - Equation

Answer 36

Question 37

The purpose and operation of an optical pump in a laser - 3 step purpose - 4 step operation

Answer 37

Question 38

The definitions of all terms in the key laser equation

Answer 38

Question 39

Using the key laser equation, show how one can get the intensity of the light produced by a laser

Answer 39

Question 40

Describe the fundamental properties of a continuous laser

Answer 40

Question 41

Optical Cavity

Answer 41

Question 42

Gain Medium

Answer 42

Question 43

Q-Switching

Answer 43

Question 44

Optical Pumping, Optical Cavity & Gain Medium => Connection

Answer 44