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53 Cards in this Set
- Front
- Back
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Gas laser adoration spectrum is |
Well defined |
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Gas lasers have to be pumped using |
Electron bombardment |
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Do gas atoms have few or many energy levels |
Many |
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What is a gas lasers usual efficiency |
1-10% |
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What is a gas lasers standard output power |
mW - W |
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What gas laser is high power/high efficiency |
CO2 |
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What is a gas lasers usual gain |
1.01 - 1.1 |
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Why are electrons used as a pump source |
They do not need a precise energy as they collide with atoms rather than being absorbed |
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How are electrons confined in lasing dye molecules |
Infinite potential well |
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What are 2 draw backs of using dye as a gain medium |
Often toxic, excited dye molecules are often unstable |
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Are dye molecule's absorption bands wide or defined |
Wide |
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Why are dye molecules energy bands wide? |
Molecular vibrations |
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How are Dye lasers pumped? |
Optically |
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What is a Dye lasers standard gain? |
1.1 - 10 |
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What is a dye lasers standard power output |
mW - W |
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Are Dye lasers tunable? |
Yes |
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How can one produce precise wavelengths from wide elision spectrums? |
Complex cavities |
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How can the band gap of a semiconductor laser be engineered? |
Ratio of dopant ions |
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How large is the active part of a semiconductor laser? |
5 - 100 um |
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Why is a semiconductor laser's small size a drawback? |
Hard to remove heat |
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How is a semiconductor laser pumped? |
Electrically |
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Is a semiconductors emission spectrum broad or narrow? |
Broad |
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Has a semiconductor laser got high or low efficiency? |
High |
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What are semiconductor lasers often used for? |
Pump lasers |
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What is the standard gain for a semiconductor laser? |
1.1 - 10 |
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What two types of metal are used for solid state lasers? |
Transition and rare earth |
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What type of empty energy states are needed for a dopant ion |
Inner states |
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Which type of metal has the most buried energy states? |
Rare earth |
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What widens the energy levels in solid state lasers? |
Phonons |
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How must a solid state laser be pumped? |
Optically |
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Why can solid state lasers be a primary laser? |
Can use a flashlamp to pump |
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What is typical working power of solid state laser? |
mW - KW |
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What is typical gain of solid state laser? |
1.1 - 10 |
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Are solid state lasers tunable? |
Yes |
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What is the typical thickness of the core of a fiber laser? |
10um |
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What is the typical thickness of the inner cladding of a fiber laser |
200um |
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What is the typical width of the outer cladding of a fiber laser? |
250um |
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What is the core of a fiber laser made of? |
Transparent glass doped with rare earth metal |
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Where is the pump light confined in a fiber laser? |
The inner cladding |
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What is the distribution of refractive index like in a fiber laser? |
Highest in core, lowest in outer cladding |
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Definition of brightness |
Power per unit area per unit solid angle. Must be conserved |
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What is brightness proportional to? |
P/(NAD)^2 |
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What is the typical working power of a fiber laser? |
mW - kW |
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What is the efficiency of a fiber laser? |
Up to 90% |
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Is spectral emission of fiber laser broad? |
Yes |
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What is typical gain of fiber lasers? |
Up to 1000 |
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How are fiber lasers pumped? |
Diode laser |
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Can fiber lasers emit visible light? |
No |
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What are 3 methods of implementing a wavelength dependent loss? |
Dichromic mirror, diffraction grating and Prisms |
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3 methods of active Q switching |
Mechanical, acouto-optic, electro-optic |
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Passive method of Q switching |
Saturable absorber |
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Timescale of Q switching |
n * cavity round trip time |
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Two methods to facilitate energy conservation and phasematching when combining photons |
Birefringent phasematching and quasiphasematching |
