THERMAL LENS FORMING ELEMENT

摘要

PROBLEM TO BE SOLVED: To form and annihilate a thermal lens fast over a wide use temperature range without depending upon the direction of an element.

SOLUTION: A thermal lens forming element 1 includes a first space 11 serving as a control light absorbing region, which is configured as a columnar body or an N prismatic body (wherein N is an integer equal to or greater than 4) and filled with a control light absorbing dyestuff solution containing a solvent having a viscosity of 0 to 3 mPa s at 160°C or above and a ratio of the viscosity of the solvent at 160°C to a viscosity of the solvent at 40°C not less than 1 and not greater than 6, wherein the columnar body or the N prismatic body has a central axis coinciding with an optical axis of incident signal light. The first space 11 is connected to a second space 13 via a solution introduction channel 12 and a dam 17. The dyestuff solution and a bubble 14 of an inert gas are confined in the second space 13.

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