How does a mode locked laser work?
The basis of the technique is to induce a fixed phase relationship between the longitudinal modes of the laser’s resonant cavity. Constructive interference between these modes can cause the laser light to be produced as a train of pulses. The laser is then said to be “phase-locked” or “mode-locked”.
How does a saturable absorber work?
A saturable absorber is an optical component with a certain absorption loss for light, which is reduced at high optical intensities. Such nonlinear absorption can occur, e.g., in a medium with absorbing dopant ions, when a strong optical intensity leads to depletion of the ground state of these ions.
What is active mode locking?
Active mode locking involves the periodic modulation of the resonator losses or of the round-trip phase change, achieved e.g. with an acousto-optic or electro-optic modulator, a Mach–Zehnder integrated-optic modulator, or a semiconductor electroabsorption modulator.
What is reverse saturable absorption?
A reverse saturable absorber (RSA) is a material whose excited state absorption cross section at wavelength λ, σex(λ), is larger than the ground state absorption cross section, σgr (λ) and which possesses four other necessary properties detailed below.
What is the difference between Q switching and mode locking?
The Q-switched lasers can generate the output pulses with high energy and short pulse width. On the other hand, the mode-locking process could be achieved by locking the relatives’ phases of oscillating photons inside the cavity (Zaitsu and Tsuchiya, 2018).
What is mode-locked fiber laser?
Fiber lasers have a number of qualities which make them attractive for ultrashort pulse generation in the picosecond or femtosecond region via active or passive mode locking: The gain bandwidth of rare-earth-doped fibers is large – typically tens of nanometers – which allows the generation of femtosecond pulses.
What does saturable process mean?
The drug then passes through the portal vein to the liver and then into the systemic circulation. If any of these processes becomes saturated, then increases in the administered dose will not correspond to increases in amount of drug absorbed into the body. This is called saturable drug absorption.
What is saturable transport?
Saturable transport systems have the advantage of being responsive to physiological and pathological stimuli. Since saturable systems can regulate peptide entry into the brain, they have the potential to play controlling roles in feeding behavior.
What is a saturable process?
What is reverse absorption?
Reverse saturable absorption. A class of nonlinear absorbers in which the excited state absorption is large compared to the ground state absorption can undergo a process called reverse saturable absorption (RSA), also known as reversible saturable absorption.
What is the Q switch in the laser?
What is Q-Switching? The term “Q-switch” refers to the type of pulse created by the laser. Unlike common laser pointers that create a continuous laser beam, Q-switched lasers create laser beam pulses that last mere billionths of a second.
Why is optical resonator needed in laser?
lasers. An optical resonator is needed to build up the light energy in the beam. The resonator is formed by placing a pair of mirrors facing each other so that light emitted along the line between the mirrors is reflected back and forth.
What does saturable metabolism mean?
These metabolic and carrier-mediated excretory clearance pathways are capacity-limited, becoming saturated at sufficiently high substrate concentrations. Saturable metabolic clearance processes lead to dose-dependent pharmacokinetics for many chemicals.
What is saturable transport system?
What does a saturable process mean?
What is the meaning of saturable?
capable of being saturated
: capable of being saturated.