Stimulated Emission Cross Section
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In this paper we discuss the quantum efficiency of the metastable 4 f 3 2 state in nd yag.
Stimulated emission cross section. The stimulated emission cross sections at 1064 4f3 2 4i11 2 and 1342 nm 4f3 2 4i13 2 in nb yvo 4 were determined by measurement of laser thresholds as a function of output mirror reflectivity. The nd yvo4 crystal has large stimulated emission cross sections at both 1064nm and 1342nm. The stimulated emission cross section of an a axis cut nd yvo4 crystal at 1064nm is about 4 times higher than that of the nd yag crystal.
The stimulated emission cross section of various solid state gain mediums can be determined through this method. We show that the vibronic interaction disrupts the equality between absorption and emission cross section reciprocity upon. The stimulated emission cross section is where a 21 is the einstein a coefficient λ is the wavelength in vacuum n is the refractive index of the medium dimensionless and.
Although the lifetime of nd yvo4 is about 2 7 times shorter than that of nd yag. Through reference 11 12 and the temperature increase of about 40 c the stimulated emission cross. The rate of stimulated emission processes for an excited atom can be calculated as the product of the so called emission cross section and the photon flux number of photons per unit area and time.
In laser physics transition cross sections are used to quantify the likelihood of optically induced transition events e g. Stimulated emission cross section. For a laser ion in a certain electronic state the rate of transitions in events per second is given as the corresponding cross section times the photon flux in photons per square meter and second.
Of absorption or stimulated emission. The photon flux can be calculated as the optical intensity divided by the photon energy. The stimulated emission cross section in square meters is where a 21 is the einstein a coefficient in radians per second λ is the wavelength in meters n is the refractive index of the medium dimensionless and g ν is the spectral line shape function in seconds.
The stimulated emission cross section is about 11 12 10 19 cm 2 at room temperature 10 11.
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