L20 Flashcards
Relaxation oscillations
- occur when the pump rate abruptly increases,
- leading to damped oscillations in intensity and gain until new steady-state values are reached.
Gain clamping
- Occurs when the pump rate increases gradually above the threshold
- leading to a rapid increase in light intensity
Damped harmonic oscillator
Name an example and details
- A laser cavity behaves as a damped harmonic oscillator
- Overshoot and decay are influenced by the cavity and gain medium structure.
Spatial hole burning
Is the distortion of the gain shape caused by saturation effects of a standing wave.
i dont understand what this is about
Purcell effect
Is the enhancement of spontaneous emission rates in atoms within a resonant cavity.
Pulsed laser
Pulsed lasers produce bursts of light by controlling the population inversion and photon flux.
Q-switching
Modulating losses with an active or passive element to generate high-energy pulses.
Femtosecond pulses
Femtosecond pulses: Extremely short laser pulses, achieved through mode locking techniques.
Kerr-lens mode-locking
Nonlinear phase delay in a medium causes self-focusing, used for passive mode locking of lasers.
non-linear relevant?
Intra-cavity self-phase-modulation
High optical intensity causes a nonlinear phase delay, described as a nonlinear change in the refractive index.
belongs to non-linear optics?
Nobel Prize 2023
Awarded for generating attosecond pulses of light to study electron dynamics in matter.
Laser types
Examples of laser types include:
- UV-VIS lasers
- IR lasers
- CO2 lasers
- Free Electron lasers
Laser gain bandwidth
add context?
Laser gain bandwidth varies for different solid-state materials.
Lasing media
Lasing media for compact solid-state lasers include edge-emitting and surface-emitting configurations.
Material challenges
add context!
Challenges in creating blue laser diodes involve high melting temperatures and lattice constant mismatches.
AlN buffer layers
Proposed by Akasaki to address issues in blue diode laser production.
Vertical CSEL
Vertical CSEL: Easy to integrate to fibers, with heating effects in the multiple layer structure.
Edge emitting lasers
Principle of edge emitting lasers: p-n junction devices, forward biased, converting energy to photons.
Compact solid-state lasers
Materials for compact solid-state lasers include GaN, GaAs, SiC, TiO2, ZnO, MgAl2O4, and MgO.