saturable absorption


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saturable absorption

[′sach·rə·bəl ab′sȯrp·shən]
(optics)
A decrease in the absorption coefficient of certain nonlinear materials at high intensities in the incident radiation.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
By using a repetition rate of 1 Hz, induced transparency (saturable absorption) is obtained, while the increase in the repetition rate to 10Hz notably produces the signature of a multiphotonic absorption (induced absorption) process in the sample.
Compared with traditional saturable absorbers, such as semiconductor saturable absorber mirrors (SESAMs) [10,11], single-walled carbon nanotubes (SWCNTs) [12], graphene [13], transitional metal dichalcogenides [14,15], black phosphorus [16,17], topological insulator saturable absorber possesses many good qualities, such as low saturable absorption threshold, large modulation depth [18, 19], short recovery time [20, 21], and wavelength independent saturable absorption [22].
Runcorn et al., "Wideband saturable absorption in few-layer molybdenum diselenide (Mo[Se.sub.2]) for Q-switching Yb-, Er- and Tm-doped fiber lasers," Optics Express, vol.
This indicates the reverse saturable absorption (RSA) type of process.
Monolithic cavity devices with gain, gain modulation and saturable absorption functions integrated on a single semiconductor chip are easy-to-use.
If [[chi].sup.(3).sub.I] < 0, then the z-scan will produce a peak near the focus, indicating induced transparency (due to saturable absorption, for example).
Figure 2(a) shows the typical open-aperture curve of the Mo[Te.sub.2] sample, which manifests that the material can exhibit nonlinear saturable absorption characteristics.
If the ESA cross section is larger than that of the ground state, [[sigma].sub.ex] > [[sigma].sub.g], then the absorption process is referred to as reverse saturable absorption (RSA) (32-34).
Since the Nd:glass (the first generation of SA) was successfully used for pulse generation in 1966 [7], a wide variety of SAs have been intensively developed, such as Semiconductor Saturable Absorption Mirrors (SESAMs) [8, 9], Carbon Nanotubes (CNTs) [1013], graphene [14-18], Topological Insulator (TI) [19, 20], and Transition Metal Dichalcogenides (TMDs) [21-24].
The absorption may be clue to two photon absorption (TPA), excited state absorption (ESA), reverse saturable absorption (RSA), etc.
The experiment results reveal the saturable absorption behaviors of the TI: [Bi.sub.2][Te.sub.3], with normalized modulation depth of 47% and saturable intensity of 32 [micro]W/[cm.sup.2].