SAM – saturable absorber mirror
SAM – saturable absorber mirror
SAM – saturable absorber mirror
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Refractive index > GaAs | AlAs | Al x Ga 1-x As | In x Ga 1-x As> Devices > Bragg <strong>mirror</strong> | <strong>SAM</strong> | R<strong>SAM</strong> | SANOS | SOC | PCAR<strong>SAM</strong> - Resonant Saturable Absorber Mirror> Contents● How does a R<strong>SAM</strong> work?● R<strong>SAM</strong> applications● Resonance wavelength● Bandwidth● Saturation intensity● Intensity dependent reflectance● Relaxation time> How does a R<strong>SAM</strong> work?The resonant <strong>saturable</strong> <strong>absorber</strong> <strong>mirror</strong> (R<strong>SAM</strong>) is a similardevice as a <strong>saturable</strong> <strong>absorber</strong> <strong>mirror</strong> (<strong>SAM</strong>), but has a larger<strong>saturable</strong> absorption, a smaller bandwidth and a lowersaturation fluence. The R<strong>SAM</strong> is designed as a resonantGires<strong>–</strong>Tournois interferometer with <strong>absorber</strong> layerspositioned at the antinodes of the optical field inside theresonator cavity.The R<strong>SAM</strong> is a nonlinear optical device, having a lowreflectance for week optical signals like noise and a highreflectance for high power signals like optical pulses. Opticalpulses saturate the <strong>absorber</strong> material inside the resonantcavity of the R<strong>SAM</strong>. Due to the short recovery time of the<strong>absorber</strong> material the R<strong>SAM</strong> blocks immediately after thereflected pulse the optical noise floor.Important parameters of the R<strong>SAM</strong> are the●●●Resonance wavelengthBandwidthSaturation power density or the saturation fluence.> R<strong>SAM</strong> applicationsThe main applications for R<strong>SAM</strong>s are:● optical noise suppression, for example after an EDFA or a pulse picker (unsaturated R<strong>SAM</strong> reflectance = 0) -->SANOS (SAturable NOise Suppressor)● opto-optical wavelength conversion (unsaturated R<strong>SAM</strong> reflectance = 0)● passive mode-locking of fiber lasers (unsaturated R<strong>SAM</strong> reflectance > 0).> Resonance wavelengthInfluence of the angle of incidenceThe resonance wavelength λ of the Gires<strong>–</strong>Tournois interferometer depends on the angle of incidence ϕ and is given byeq.(1)withSeongKyeong Photonics 16 info@skphotonics.com