Monochromatic light adjustable-ratio polarization-independent beam splitter

Abstract

The invention discloses a monochromatic light adjustable-ratio polarization-independent beam splitter comprising five light beam displacers (BDs) which are arranged in sequence and recorded as BD1-BD5. After incident light enter BD1, the incident light is divided into an upper light beam and a lower light beam; the upper light beam and the lower light beam correspondingly pass through a half wave plate and a glass compensation plate and then enter BD2, and both the upper light beam and the lower light beam are shifted downward through the spatial walk-off function of BD2; the upper light beam and the lower light beam pass through corresponding half wave plates and then enter BD3, BD3 respectively divide the upper light beam and the lower light beam into two light beams, and therefore, four light beams distributed from top to bottom are formed; the four light beams enter BD4 after passing through a half wave plate, BD4 combines the two light beams in the middle into one light beam, and therefore, three light beams distributed from top to bottom are formed; the three light beams correspondingly pass through a half wave plate, a glass compensation plate and a half wave plate and then enter BD5, BD5 combines the light beam in the middle with the upper and lower light beams respectively, and therefore, an upper light beam and a lower light beam are formed and emitted out. By adopting the beam splitter of the invention, adjustment of beam splitting in any ratio can be realized, and high precision is achieved.

Description

technical field [0001] The invention relates to the field of optical technology, in particular to a polarization-independent beam splitter with adjustable ratio of monochromatic light. Background technique [0002] The beam splitter is the basic device of various optical instruments and experiments. It can split a beam of light into two beams of light or combine two beams of light into one beam of light. Now the polarization-independent beam splitter of the mainstream of space light is the surface coating Type beam splitter (Beam Splitter BS for short), divided into two types: one is 45-degree type BS, but because the current coating process is difficult to coat the reflective and transmissive film well, the ratio cannot be well controlled, And often this kind of coating type BS can only achieve 50:50 for o light (ordinary light), or 50:50 for e light (extraordinary light), but cannot achieve both; the other kind of BS is 0-degree reflective BS , this kind of BS can achieve...

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Problems solved by technology

[0002] The beam splitter is the basic device of various optical instruments and experiments. It can split a beam of light into two beams of light or combine two beams of light into one beam of light. Now the polarization-independent beam splitter of the mainstream of space light is the surface coating Type beam splitter (Beam Splitter BS for short), divided into two types: one is 45-degree type BS, but because the current coating process is difficult to coat the reflective and transmissive film well, the ratio cannot be well controlled, And often this kind of coating type BS can only achieve 50:50 for o light (ordinary light), or 50:50 for e light (extraordinary light), but cannot achieve both; the other kind of BS is 0-degree reflective BS , this kind of BS can achieve a very good splitting ratio, but because it is 0-degree reflection, it is inconvenient in practical application; and these two kinds of BSs cannot adjust the splitting ratio, and cannot achieve arbitrary ratio adjustment

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