Measure Wave Plate’s Retardance and Adjust Via Wavelength Tuning | Thorlabs Insights скачать в хорошем качестве

Measure Wave Plate’s Retardance and Adjust Via Wavelength Tuning | Thorlabs Insights

When using a wave plate, the retardance it provides is not necessarily the expected quarter or half wave. Several factors affect the retardance within the system, including the light’s wavelength and angle of incidence, the ambient temperature, and manufacturing tolerances. These variables make it difficult to predict the exact retardance provided under the application’s operating conditions, which can be problematic when a setup’s performance is sensitive to the light’s polarization state. In this video, we demonstrate a technique for measuring the wave plate’s effective retardance under the application’s operating conditions. The approach requires two linear polarizers, a power sensor, and a power meter. The method for obtaining the two required power measurements and calculating the effective retardance is shown. In addition, we use measurements taken with a turnkey polarimeter to verify our results. When the retardance provided by the wave plate does not meet the application’s requirements, one option for obtaining the desired retardance could include tuning the light’s wavelength. We demonstrate this approach by temperature-tuning our laser’s wavelength in two 1 nm steps. After each step, we re-measure the wave plate’s retardance. The total 2 nm change in wavelength provided a 0.11π change in retardance. This illustrates that relatively small changes in the light’s wavelength can significantly affect the wave plate's retardance. 0:00 Introduction 1:11 Align Setup 5:00 Measure & Verify Retardance 6:29 Wavelength-Tune to 1/4-Wave Retardance 8:42 Measure & Verify Tuned Retardance 9:49 Increase Laser Wavelength +1 nm 10:21 Measure Effect on Retardance Components used in this Demonstration Include: -CLD1010LP Laser Diode/ Temperature Controller: https://www.thorlabs.com/newgrouppage... -LP633-SF50 Pigtailed Laser Diode (633 nm): https://www.thorlabs.com/newgrouppage... -TN632R5F2 Fiber Coupler, 50:50 Split: https://www.thorlabs.com/newgrouppage... -BFCT Component Fiber Tray: https://www.thorlabs.com/newgrouppage... -Fiber Optic Connector Mating Sleeves: https://www.thorlabs.com/newgrouppage... -Fiber Patch Cable, Single Mode: https://www.thorlabs.com/newgrouppage... -BM075 Magnetic Button Clamps: https://www.thorlabs.com/newgrouppage... -FOFMS Fiber Optic Attenuator Mount: https://www.thorlabs.com/newgrouppage... -CFH2-V Variable Insert for Fiber Optic Filter Mounts: https://www.thorlabs.com/newgrouppage... -Fiber Patch Cable, Multimode: https://www.thorlabs.com/newgrouppage... -CCS100 Spectrometer: https://www.thorlabs.com/newgrouppage... -PM400 Power Meter: https://www.thorlabs.com/newgrouppage... -TC12FC-633 Triplet Collimator: https://www.thorlabs.com/newgrouppage... -AD127F Adapter, SM1 to Ø0.5”: https://www.thorlabs.com/newgrouppage... -KS1T Kinematic Mirror Mount: https://www.thorlabs.com/newgrouppage... -LPVIS050-MP2 Mounted Linear Polarizer: https://www.thorlabs.com/newgrouppage... -SM1A6 Adapter, SM1 to SM05: https://www.thorlabs.com/newgrouppage... -RSP1D Rotation Mount, Adjustable Zero: https://www.thorlabs.com/newgrouppage... -Post Collars: https://www.thorlabs.com/newgrouppage... -WPMQ10M-633 Quarter-Wave Plate, Multi-Order: https://www.thorlabs.com/newgrouppage... -PRM1 Rotation Mount, High-Precision: https://www.thorlabs.com/newgrouppage... -RSP1X225 Rotation Mount, Indexed: https://www.thorlabs.com/newgrouppage... -S130C Power Sensor: https://www.thorlabs.com/newgrouppage... -SM1A29 Adapter, for Power Sensor: https://www.thorlabs.com/newgrouppage... -SM1A1 Adapter, SM1 to SM05: https://www.thorlabs.com/newgrouppage... -Lens Tubes, Ø0.5”: https://www.thorlabs.com/newgrouppage... -PAX1000VIS Polarimeter: https://www.thorlabs.com/newgrouppage... -KM200PM Kinematic Prism Mount: https://www.thorlabs.com/newgrouppage... For more Insights: https://www.thorlabs.com/newgrouppage...