Saturable absorbers V:YAG and Cr:YAG | סופחים הניתנים לרוויה

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MATERIAL CHARACTERISTICS
Formula	Cr⁴⁺:Y₃Al₅O₁₂
Crystal structure	cubic – la3d
Ground-state absorption cross-section at 1064 nm	4 x 10^-18 cm²
Excited-state absorption cross-section at 1064 nm	7 x 10^-19 cm²
Recovery time	4 µs

MATERIAL CHARACTERISTICS
Formula	V³⁺:Y₃Al₅O₁₂
Crystal structure	cubic – la3d
Ground-state absorption cross-section at 1064 nm	1.5 x 10^-18 cm²
Excited-state absorption cross-section at 1064 nm	3 x 10^-19 cm²
Ground-state absorption cross-section at 1338 nm	2.5 x 10^-18 cm²
Excited-state absorption cross-section at 1338 nm	4.5 x 10-¹⁹ cm²
Ground-state absorption cross-section at 1444 nm	1.8 x 10^-18 cm²
Excited-state absorption cross-section at 1444 nm	3 x 10^-19 cm²
Recovery time	5 ns

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10 In-Demand Saturable Absorbers & Pulsing Devices

Semiconductor Saturable Absorber Mirrors (SESAMs): These are thin-film devices built on a mirror substrate. They are a popular and versatile option, especially for mode-locking applications, which produce even shorter, femtosecond pulses. Their properties can be precisely engineered to match specific laser parameters.
Graphene and Other 2D Materials: Single or few-layer sheets of materials like graphene and molybdenum disulfide ( $M o S_{2}$ ) are highly in-demand due to their broadband saturable absorption properties. This means they can be used with a wide range of laser wavelengths, making them very versatile.
Cobalt-doped Spinel ( $C o^{2} + : M g A l_{2} O_{4}$ ): A solid-state crystal like V:YAG and Cr:YAG, Co:spinel is a leading choice for passive Q-switching, particularly for lasers operating in the 1.5 µm eye-safe spectral region, which is important for military and lidar applications.
Carbon Nanotubes (CNTs): Similar to graphene, carbon nanotubes can be used as broadband saturable absorbers, especially in compact, fiber-based laser systems. They offer a good balance of fast recovery time and low-cost manufacturing.
Dyes: Certain organic dyes exhibit saturable absorption and are historically significant. While often replaced by solid-state alternatives for high-power applications, they are still used in some laboratory and research settings for specific wavelengths, particularly in the visible spectrum.
Acousto-Optic (AO) Q-switches: These are an example of active Q-switching devices. They use a radio frequency signal to generate sound waves in a crystal, which diffracts the laser beam and modulates the cavity losses. AO Q-switches are in demand for applications that require precise control over pulse repetition rate.
Electro-Optic (EO) Q-switches: Another type of active Q-switcher, these use a voltage to change the refractive index of a crystal (like BBO or KD*P), which rotates the polarization of light and controls the laser cavity losses. They can generate much higher peak powers than passive Q-switches.
Chromium-doped Yttrium Orthosilicate ( $C r^{4+} : Y S i O_{5}$ ): Often referred to as Cr:YSO, this is another solid-state saturable absorber crystal used for passive Q-switching in similar wavelength ranges to Cr:YAG.
Lead Sulfide Quantum Dots ( $P b S$ QDs): These tiny semiconductor crystals are gaining traction as saturable absorbers for mid-infrared lasers. Their properties can be tuned by changing their size, offering great design flexibility for specific wavelengths.
Black Phosphorus: As another two-dimensional material, black phosphorus is a promising new saturable absorber for both Q-switching and mode-locking, particularly in the near- and mid-infrared ranges.

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