![]() Obviously, the saturated output power (other than the saturation power) depends on the pump power. The saturation power should not be confused with the saturated output power, which is usually not precisely defined but means the output power achieved for an input signal power which causes significant amplifier saturation. in a mode-locked laser, the ratio of continuous-wave intracavity power to saturation power is an important parameter for the initial pulse formation process. For a saturable absorber, as used e.g.This is remarkable because the laser intensity in this situation is thus determined only by a property of the gain medium, not by resonator losses etc. The laser intensity in the gain medium of a four-level laser equals the saturation intensity if the pump power is twice the threshold pump power.It determines the amount of input power of an amplifier required for achieving most of the possible output power.The saturation power plays an important role in various areas of laser physics and laser or amplifier design. When the power equals the saturation power, the gain is reduced to half the small-signal gain.Ī comparison with the equations for the saturation energy shows that the saturation power can be calculated as the saturation energy divided by the upper-state lifetime. Calculator for the Saturation Power Wavelength:Įnter input values with units, where appropriate.Īfter you have modified some inputs, click the “calc” button to recalculate the output.Īttention: The buttons do not work, as Javascript is turned off in your browser! Figure 1: Dependence of laser gain on the optical power, calculated for the steady state. The quantity is zero for four-level gain media but should not be forgotten for quasi-three-level gain media. Where is the photon energy at the signal wavelength, and are the emission and absorption cross-sections at the emission wavelength, is the upper-state lifetime, and is the effective mode area. For high gain, it is common to refer to the output power.įor a low-gain laser amplifier, saturation intensity and power can be calculated according to ![]() Usually it is assumed that the gain is small, i.e. The saturation intensity is the corresponding optical intensity, i.e., the saturation power per unit area. Similarly, the saturation power of a saturable absorber is defined, although saturable absorbers are usually not meant to be operated in the steady state. The saturation power of a laser gain medium is the optical power of an input signal which in the steady state leads to a reduction in the gain to half of its small-signal value. ![]()
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