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We proposed an optomechanical system to quantify the net force on a strand ofcleaved silica optical fiber in situ as the laser light was being guidedthrough it. Four strands of the fiber were bond to both sides of a macroscopicoscillator, whose movements were accurately monitored by a Michelsoninterferometer. The laser light was propagating with variable optical powersand frequency modulations. Experimentally, we discovered that the driving forcefor the oscillator consisted of not only the optical force of the light exitingfrom the cleaved facets but also the tension along the fiber induced by thelight guided therewithin. The net driving force was determined only by theoptical power, refractive index of the fiber, and the speed of light, whichpinpoints its fundamental origin.

Quantitative in situ measurement of optical force along a strand of cleaved silica optical fiber induced by the light guided therewithin