By Rudiger Paschotta
This consultant presents the fundamental details on laser pulse new release, together with Q switching, achieve switching, mode locking, and the amplification of ultrashort pulses to excessive energies. Pulse characterization is usually lined, in addition to the actual points and diverse technical limitations.
you will need to notice that laser pulses span an vastly huge parameter house when it comes to pulse length, pulse strength, and wavelength. this is often attainable purely with quite a lot of suggestions, the most typical of that are mentioned during this box Guide.
This advisor is designed for practitioners, researchers, clients of pulsed and ultrafast laser structures, and an individual eager to study extra in regards to the strength of alternative pulse iteration methods.
- thesaurus of Symbols
- advent to Optical Pulses
- Q Switching
- achieve Switching
- Mode Locking
- Amplification of Ultrashort Pulses
- Pulse Characterization
Read or Download Field Guide to Laser Pulse Generation (SPIE Vol. FG14) PDF
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Extra info for Field Guide to Laser Pulse Generation (SPIE Vol. FG14)
This can very much depend on the pulse shaping mechanism used in a laser, and the parameters need to be consistent with the overall laser design. For example, a lower modulation depth can be sufficient when the pulse duration is not too short and soliton pulse shaping effects are employed. The SESAM then needs only to start and stabilize the mode locking but not to enforce a short pulse duration. On the other hand, fiber lasers often require SESAMs with a high modulation depth. 2. A suitable material combination and device design has to be worked out so that the desired parameters can be reached.
Mode Locking 33 Mode Locking Mode locking is the most important technique for generating pulses with picosecond and femtosecond durations. When a laser is mode locked, one or sometimes several pulses are circulating in the laser resonator. The case of a single pulse is most common. Each time the pulse hits the output coupler mirror, a part of its energy is emitted, so the laser output is a regular pulse train. The gain medium replenishes the pulse energy in each roundtrip. The pulse repetition rate is determined by the resonator’s round-trip time and the number of pulses.
18 Laser Pulse Generation Dynamics of Passive Q Switching In a passively Q-switched laser, the pulse generation process is different: 1. Initially, the losses introduced by the passive Q switch are too high for laser operation to start. 2. However, once the laser gain becomes slightly larger than the total losses, lasing begins at a low power level and initially grows at a low rate. 3. Ideally, the saturation energy of the absorber is much lower than that of the gain medium so that the generated laser light can quickly saturate the absorption well before it affects the gain.