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| d2:d2_250_heterodyne_module [2016/05/12 21:58] – echandler | d2:d2_250_heterodyne_module [2021/08/26 15:26] (current) – external edit 127.0.0.1 |
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| Mount both laser modules and the D2-250 Heterodyne Module to an optical breadboard or table. Leave sufficient space between the lasers and optical modules to allow for the adjustment of the hex screws and insertion of the F220FC-B Fiber Coupler and VPN00460 Fiber Optic Cable. Turn on both lasers. During mounting, align the first laser such that the beam enters "INPUT1" and exits "OUTPUT1" centered through each aperture. Repeat with the second laser through "INPUT2" and "OUTPUT2". | Mount both laser modules and the D2-250 Heterodyne Module to an optical breadboard or table. Leave sufficient space between the lasers and optical modules to allow for the adjustment of the hex screws and insertion of the F220FC-B Fiber Coupler and VPN00460 Fiber Optic Cable. Turn on both lasers. During mounting, align the first laser such that the beam enters "INPUT1" and exits "OUTPUT1" centered through each aperture. Repeat with the second laser through "INPUT2" and "OUTPUT2". |
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| <imgcaption 250-top|D2-250 and Laser Mounting>{{ :d2:d2_250:LaserHeterodyneMount.jpg?300 }}</imgcaption> | <imgcaption sys-top|D2-250 and Laser Mounting>{{ :d2:d2_250:LaserHeterodyneMount.jpg?300 }}</imgcaption> |
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| Turn OFF both lasers, then screw the F220FC-B Fiber Coupler into the "FC Port" on the D2-250 and hand tighten. Screw in the FC/APC connector of the VPN00460 Fiber Optic Cable into the F220FC-B Fiber Coupler and hand tighten. | Turn OFF both lasers, then screw the F220FC-B Fiber Coupler into the "FC Port" on the D2-250 and hand tighten. Screw in the FC/APC connector of the VPN00460 Fiber Optic Cable into the F220FC-B Fiber Coupler and hand tighten. |
| With the power meter, observe the output power through the VPN00460 Fiber Optic Cable. With the 5/64" hex key, adjust the first kinematic mount in the "INPUT1" beam path (Stage 1) to optimize the optical power observed (and thus the fiber coupling). Using a note card or IR card to observe the "MIXER" output very near to the D2-250, adjust the first kinematic mount in the "INPUT2" beam path (Stage 2) and overlap the observed beams. In the far field, adjust the "MIXER" kinematic mount (Stage 3) until both beams overlap. Some iteration may be required between the second beam and the final kinematic mount. | With the power meter, observe the output power through the VPN00460 Fiber Optic Cable. With the 5/64" hex key, adjust the first kinematic mount in the "INPUT1" beam path (Stage 1) to optimize the optical power observed (and thus the fiber coupling). Using a note card or IR card to observe the "MIXER" output very near to the D2-250, adjust the first kinematic mount in the "INPUT2" beam path (Stage 2) and overlap the observed beams. In the far field, adjust the "MIXER" kinematic mount (Stage 3) until both beams overlap. Some iteration may be required between the second beam and the final kinematic mount. |
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| <imgcaption 250-top|D2-250 Interior>{{ :d2:d2_250:LaserHeterodyneAlign.jpg?300 }}</imgcaption> | <imgcaption 250-top-photo|D2-250 Interior>{{ :d2:d2_250:LaserHeterodyneAlign.jpg?300 }}</imgcaption> |
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| Fully optimize the coupling into the fiber by adjusting the "INPUT2" kinematic mount and the "MIXER" kinematic mount to optimize the power observed on the power meter. | Fully optimize the coupling into the fiber by adjusting the "INPUT2" kinematic mount and the "MIXER" kinematic mount to optimize the power observed on the power meter. |
| Block laser #1, and rotate the "INPUT2" waveplate to reduce the observed power below 0.50mW. Block laser #2, and rotate the "INPUT1" waveplate to reduce the observed power below 0.50mW. To protect the D2-160 Beat Note module, the combined power should not exceed 1mW. The SC fiber end can now be connected to the D2-160 or other beat note detector. | Block laser #1, and rotate the "INPUT2" waveplate to reduce the observed power below 0.50mW. Block laser #2, and rotate the "INPUT1" waveplate to reduce the observed power below 0.50mW. To protect the D2-160 Beat Note module, the combined power should not exceed 1mW. The SC fiber end can now be connected to the D2-160 or other beat note detector. |
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| <imgcaption 250-top|D2-250 Heterodyne Module>{{ :d2:d2_250:d2-215-top-down.png?300 }}</imgcaption> | |
