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balanced photodetector  (Thorlabs)

 
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    Thorlabs balanced photodetector
    Conceptual illustration of beam‑deflection‑based optical ultrasound sensing enhanced by multiple reflection. (a) Layout of the multi‑reflection cavity formed by mirrors M2 and M3. The probe beam (IN) undergoes multiple reflections between the mirrors and is finally reflected back; its output includes a stationary retro‑reflected component (O1) and acoustically deflected components (O2, O3). (b) Balanced differential detection optical path. A linearly polarized laser beam is split by a polarizing beam splitter (PBS) into probe and reference arms. The probe beam enters the multi‑reflection cavity, where it undergoes multiple round‑trips through the ultrasound (US) field in the detection zone. Through repeated acousto‑optic interactions, the signal beam accumulates angular deflection, travel back, is subsequently reflected by the PBS, and coupled via a multimode fiber (MMF2) to one input of a balanced <t>photodetector</t> (BPD). The reference beam is fiber‑guided to the other BPD input for common‑mode noise cancellation. (c) Beam paths in the multi-reflection cavity, showing the gradual decrease of the incidence angle by an amount equal to the mirrors’ mutual angle β . Abbreviations: PBS, polarizing beam splitter; BPD, balanced photodetector; MMF, multimode fiber; US, ultrasound; L, lens; M, mirror, HWP, half‑wave plate; QWP, quarter‑wave plate.
    Balanced Photodetector, supplied by Thorlabs, used in various techniques. Bioz Stars score: 86/100, based on 1 PubMed citations. ZERO BIAS - scores, article reviews, protocol conditions and more
    https://www.bioz.com/result/balanced photodetector/product/Thorlabs
    Average 86 stars, based on 1 article reviews
    balanced photodetector - by Bioz Stars, 2026-05
    86/100 stars

    Images

    1) Product Images from "Multiple reflection: A Route to enhanced sensitivity in beam-deflection optical ultrasound sensing"

    Article Title: Multiple reflection: A Route to enhanced sensitivity in beam-deflection optical ultrasound sensing

    Journal: Photoacoustics

    doi: 10.1016/j.pacs.2026.100821

    Conceptual illustration of beam‑deflection‑based optical ultrasound sensing enhanced by multiple reflection. (a) Layout of the multi‑reflection cavity formed by mirrors M2 and M3. The probe beam (IN) undergoes multiple reflections between the mirrors and is finally reflected back; its output includes a stationary retro‑reflected component (O1) and acoustically deflected components (O2, O3). (b) Balanced differential detection optical path. A linearly polarized laser beam is split by a polarizing beam splitter (PBS) into probe and reference arms. The probe beam enters the multi‑reflection cavity, where it undergoes multiple round‑trips through the ultrasound (US) field in the detection zone. Through repeated acousto‑optic interactions, the signal beam accumulates angular deflection, travel back, is subsequently reflected by the PBS, and coupled via a multimode fiber (MMF2) to one input of a balanced photodetector (BPD). The reference beam is fiber‑guided to the other BPD input for common‑mode noise cancellation. (c) Beam paths in the multi-reflection cavity, showing the gradual decrease of the incidence angle by an amount equal to the mirrors’ mutual angle β . Abbreviations: PBS, polarizing beam splitter; BPD, balanced photodetector; MMF, multimode fiber; US, ultrasound; L, lens; M, mirror, HWP, half‑wave plate; QWP, quarter‑wave plate.
    Figure Legend Snippet: Conceptual illustration of beam‑deflection‑based optical ultrasound sensing enhanced by multiple reflection. (a) Layout of the multi‑reflection cavity formed by mirrors M2 and M3. The probe beam (IN) undergoes multiple reflections between the mirrors and is finally reflected back; its output includes a stationary retro‑reflected component (O1) and acoustically deflected components (O2, O3). (b) Balanced differential detection optical path. A linearly polarized laser beam is split by a polarizing beam splitter (PBS) into probe and reference arms. The probe beam enters the multi‑reflection cavity, where it undergoes multiple round‑trips through the ultrasound (US) field in the detection zone. Through repeated acousto‑optic interactions, the signal beam accumulates angular deflection, travel back, is subsequently reflected by the PBS, and coupled via a multimode fiber (MMF2) to one input of a balanced photodetector (BPD). The reference beam is fiber‑guided to the other BPD input for common‑mode noise cancellation. (c) Beam paths in the multi-reflection cavity, showing the gradual decrease of the incidence angle by an amount equal to the mirrors’ mutual angle β . Abbreviations: PBS, polarizing beam splitter; BPD, balanced photodetector; MMF, multimode fiber; US, ultrasound; L, lens; M, mirror, HWP, half‑wave plate; QWP, quarter‑wave plate.

    Techniques Used:



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    Conceptual illustration of beam‑deflection‑based optical ultrasound sensing enhanced by multiple reflection. (a) Layout of the multi‑reflection cavity formed by mirrors M2 and M3. The probe beam (IN) undergoes multiple reflections between the mirrors and is finally reflected back; its output includes a stationary retro‑reflected component (O1) and acoustically deflected components (O2, O3). (b) Balanced differential detection optical path. A linearly polarized laser beam is split by a polarizing beam splitter (PBS) into probe and reference arms. The probe beam enters the multi‑reflection cavity, where it undergoes multiple round‑trips through the ultrasound (US) field in the detection zone. Through repeated acousto‑optic interactions, the signal beam accumulates angular deflection, travel back, is subsequently reflected by the PBS, and coupled via a multimode fiber (MMF2) to one input of a balanced <t>photodetector</t> (BPD). The reference beam is fiber‑guided to the other BPD input for common‑mode noise cancellation. (c) Beam paths in the multi-reflection cavity, showing the gradual decrease of the incidence angle by an amount equal to the mirrors’ mutual angle β . Abbreviations: PBS, polarizing beam splitter; BPD, balanced photodetector; MMF, multimode fiber; US, ultrasound; L, lens; M, mirror, HWP, half‑wave plate; QWP, quarter‑wave plate.
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    Conceptual illustration of beam‑deflection‑based optical ultrasound sensing enhanced by multiple reflection. (a) Layout of the multi‑reflection cavity formed by mirrors M2 and M3. The probe beam (IN) undergoes multiple reflections between the mirrors and is finally reflected back; its output includes a stationary retro‑reflected component (O1) and acoustically deflected components (O2, O3). (b) Balanced differential detection optical path. A linearly polarized laser beam is split by a polarizing beam splitter (PBS) into probe and reference arms. The probe beam enters the multi‑reflection cavity, where it undergoes multiple round‑trips through the ultrasound (US) field in the detection zone. Through repeated acousto‑optic interactions, the signal beam accumulates angular deflection, travel back, is subsequently reflected by the PBS, and coupled via a multimode fiber (MMF2) to one input of a balanced <t>photodetector</t> (BPD). The reference beam is fiber‑guided to the other BPD input for common‑mode noise cancellation. (c) Beam paths in the multi-reflection cavity, showing the gradual decrease of the incidence angle by an amount equal to the mirrors’ mutual angle β . Abbreviations: PBS, polarizing beam splitter; BPD, balanced photodetector; MMF, multimode fiber; US, ultrasound; L, lens; M, mirror, HWP, half‑wave plate; QWP, quarter‑wave plate.
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    Conceptual illustration of beam‑deflection‑based optical ultrasound sensing enhanced by multiple reflection. (a) Layout of the multi‑reflection cavity formed by mirrors M2 and M3. The probe beam (IN) undergoes multiple reflections between the mirrors and is finally reflected back; its output includes a stationary retro‑reflected component (O1) and acoustically deflected components (O2, O3). (b) Balanced differential detection optical path. A linearly polarized laser beam is split by a polarizing beam splitter (PBS) into probe and reference arms. The probe beam enters the multi‑reflection cavity, where it undergoes multiple round‑trips through the ultrasound (US) field in the detection zone. Through repeated acousto‑optic interactions, the signal beam accumulates angular deflection, travel back, is subsequently reflected by the PBS, and coupled via a multimode fiber (MMF2) to one input of a balanced <t>photodetector</t> (BPD). The reference beam is fiber‑guided to the other BPD input for common‑mode noise cancellation. (c) Beam paths in the multi-reflection cavity, showing the gradual decrease of the incidence angle by an amount equal to the mirrors’ mutual angle β . Abbreviations: PBS, polarizing beam splitter; BPD, balanced photodetector; MMF, multimode fiber; US, ultrasound; L, lens; M, mirror, HWP, half‑wave plate; QWP, quarter‑wave plate.
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    Conceptual illustration of beam‑deflection‑based optical ultrasound sensing enhanced by multiple reflection. (a) Layout of the multi‑reflection cavity formed by mirrors M2 and M3. The probe beam (IN) undergoes multiple reflections between the mirrors and is finally reflected back; its output includes a stationary retro‑reflected component (O1) and acoustically deflected components (O2, O3). (b) Balanced differential detection optical path. A linearly polarized laser beam is split by a polarizing beam splitter (PBS) into probe and reference arms. The probe beam enters the multi‑reflection cavity, where it undergoes multiple round‑trips through the ultrasound (US) field in the detection zone. Through repeated acousto‑optic interactions, the signal beam accumulates angular deflection, travel back, is subsequently reflected by the PBS, and coupled via a multimode fiber (MMF2) to one input of a balanced <t>photodetector</t> (BPD). The reference beam is fiber‑guided to the other BPD input for common‑mode noise cancellation. (c) Beam paths in the multi-reflection cavity, showing the gradual decrease of the incidence angle by an amount equal to the mirrors’ mutual angle β . Abbreviations: PBS, polarizing beam splitter; BPD, balanced photodetector; MMF, multimode fiber; US, ultrasound; L, lens; M, mirror, HWP, half‑wave plate; QWP, quarter‑wave plate.
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    Image Search Results


    Conceptual illustration of beam‑deflection‑based optical ultrasound sensing enhanced by multiple reflection. (a) Layout of the multi‑reflection cavity formed by mirrors M2 and M3. The probe beam (IN) undergoes multiple reflections between the mirrors and is finally reflected back; its output includes a stationary retro‑reflected component (O1) and acoustically deflected components (O2, O3). (b) Balanced differential detection optical path. A linearly polarized laser beam is split by a polarizing beam splitter (PBS) into probe and reference arms. The probe beam enters the multi‑reflection cavity, where it undergoes multiple round‑trips through the ultrasound (US) field in the detection zone. Through repeated acousto‑optic interactions, the signal beam accumulates angular deflection, travel back, is subsequently reflected by the PBS, and coupled via a multimode fiber (MMF2) to one input of a balanced photodetector (BPD). The reference beam is fiber‑guided to the other BPD input for common‑mode noise cancellation. (c) Beam paths in the multi-reflection cavity, showing the gradual decrease of the incidence angle by an amount equal to the mirrors’ mutual angle β . Abbreviations: PBS, polarizing beam splitter; BPD, balanced photodetector; MMF, multimode fiber; US, ultrasound; L, lens; M, mirror, HWP, half‑wave plate; QWP, quarter‑wave plate.

    Journal: Photoacoustics

    Article Title: Multiple reflection: A Route to enhanced sensitivity in beam-deflection optical ultrasound sensing

    doi: 10.1016/j.pacs.2026.100821

    Figure Lengend Snippet: Conceptual illustration of beam‑deflection‑based optical ultrasound sensing enhanced by multiple reflection. (a) Layout of the multi‑reflection cavity formed by mirrors M2 and M3. The probe beam (IN) undergoes multiple reflections between the mirrors and is finally reflected back; its output includes a stationary retro‑reflected component (O1) and acoustically deflected components (O2, O3). (b) Balanced differential detection optical path. A linearly polarized laser beam is split by a polarizing beam splitter (PBS) into probe and reference arms. The probe beam enters the multi‑reflection cavity, where it undergoes multiple round‑trips through the ultrasound (US) field in the detection zone. Through repeated acousto‑optic interactions, the signal beam accumulates angular deflection, travel back, is subsequently reflected by the PBS, and coupled via a multimode fiber (MMF2) to one input of a balanced photodetector (BPD). The reference beam is fiber‑guided to the other BPD input for common‑mode noise cancellation. (c) Beam paths in the multi-reflection cavity, showing the gradual decrease of the incidence angle by an amount equal to the mirrors’ mutual angle β . Abbreviations: PBS, polarizing beam splitter; BPD, balanced photodetector; MMF, multimode fiber; US, ultrasound; L, lens; M, mirror, HWP, half‑wave plate; QWP, quarter‑wave plate.

    Article Snippet: This signal beam was coupled through a lens (L4) into a multimode fiber (MMF2) and directed to one input of a balanced photodetector (BPD; PDB435A, Thorlabs).

    Techniques: