Field Guide to Lasers (SPIE Field Guide Vol. FG12) (Field by Rudiger Paschotta

By Rudiger Paschotta

This advisor offers an summary at the crucial sorts of lasers and their key homes in addition to an advent into an important actual and technological facets of lasers. except describing the fundamental rules (such as prompted emission and the homes of optical resonators), this consultant discusses the varied very important homes of laser crystals, the impression of thermal results on laser functionality, tools of wavelength tuning and pulse iteration, and laser noise. Practitioners also will achieve priceless perception from comments on laser defense and procure new principles approximately easy methods to make the laser improvement strategy extra efficient.

Contents

- thesaurus of Symbols
- simple ideas of Lasers
- Laser Beams
- Optical Resonators
- Waveguides
- Semiconductor Lasers
- Solid-State Bulk Lasers
- Fiber and Waveguide Lasers
- Dye Lasers
- fuel Lasers
- different different types of Lasers
- Narrow-Linewidth Operation
- Tunable Lasers
- Q Switching
- achieve Switching
- Mode Locking
- hollow space Dumping
- Nonlinear Frequency Conversion
- Laser Noise
- Laser protection
- layout and improvement
- Bibliography
- Index

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Additional resources for Field Guide to Lasers (SPIE Field Guide Vol. FG12) (Field Guide Series)

Example text

Optical Resonators 25 Bandwidth and Finesse of a Resonator A resonance of an optical resonator can be excited, for example, by injecting light from outside onto a partially transmissive mirror of the resonator. Resonant enhancement is possible if (a) the incident light has good spatial overlap with a resonator mode, and (b) the frequency of incident light approximately matches a mode frequency. The figure shows the power in a resonator when the optical frequency is scanned through two subsequent axial resonances, and the profile of the input beam matches that of the fundamental modes.

Optical amplification via stimulated emission is possible for a sufficiently high carrier density in the conduction band. In this situation, electrons near the bottom of the conduction band make transitions to the highest (and depleted) energy levels of the valence band, which can also be described as recombination with holes in the valence band. The photon energy is at or somewhat above the bandgap energy, and this determines the emission wavelength. Optical pumping is possible at a somewhat shorter wavelength and involves the fast relaxation of carriers in both bands.

For a Gaussian beam, the brightness is the optical power divided by the square of the wavelength. Some high-power lasers have a rather low beam quality and thus only a moderate brightness. For example, laser diode stacks can produce kilowatt powers but have a much lower brightness than a diffraction-limited 100-mW laser. , some solid-state bulk lasers and fiber lasers) generate an output with a much higher brightness than their pump source; they are then sometimes called brightness converters. The design of a laser often becomes more difficult when the available pump brightness is low or when the output brightness must be high.

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