d2:quick_start_opls
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d2:quick_start_opls [2017/08/04 15:35] – [D2-135 Locking] Michael Radunsky | d2:quick_start_opls [2019/03/08 18:24] – [D2-250 or D2-150 Alignment] Michael Radunsky | ||
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At this point you should have two lasers temperature stabilized and running at their operating current. The two lasers should be within a few GHz of the same frequency of each other. (If unsure of the laser frequency, you can use a spectroscopy module to get one laser on transition and then temporarily move the spectroscopy module to the other laser to get it near the same transition.) | At this point you should have two lasers temperature stabilized and running at their operating current. The two lasers should be within a few GHz of the same frequency of each other. (If unsure of the laser frequency, you can use a spectroscopy module to get one laser on transition and then temporarily move the spectroscopy module to the other laser to get it near the same transition.) | ||
- | ===== D2-150 Alignment ===== | + | ===== D2-250 or D2-150 Alignment ===== |
//This section assumes you are using the [[d2: | //This section assumes you are using the [[d2: | ||
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=== First Laser Alignment === | === First Laser Alignment === | ||
- | Use a power meter to measure the power out from the fiber connected to the D2-150. Block the laser that has two adjustments and measure the power from the laser with one adjustment that gets coupled into the fiber. Use the two adjustments on the beam splitter that affects the laser position to maximize the power into the fiber. If you cannot measure any light from the fiber, it is often helpful to put light into the fiber (opposite direction from how the system operates) and see how well that light gets back to the laser. Adjust the same beam splitter so the light is aimed directly at the laser source. This should get the alignment close enough to measure the power in the fiber to use for further optimization. Aim for 500 μW of power although a few hundred microwatts should be sufficient. <html>< | + | Use a power meter to measure the power out from the fiber connected to the D2-150. Block the laser that has two adjustments and measure the power from the laser with one adjustment that gets coupled into the fiber. Use the two adjustments on the beam splitter that affects the laser position to maximize the power into the fiber. If you cannot measure any light from the fiber, it is often helpful to put light into the fiber (opposite direction from how the system operates) and see how well that light gets back to the laser. Adjust the same beam splitter so the light is aimed directly at the laser source. This should get the alignment close enough to measure the power in the fiber to use for further optimization. Aim for 500 μW of power although a few hundred microwatts should be sufficient. <color red>The detector in the D2-160 or D2-135-FC can be damaged by more than 1 mW input power, so be careful not to couple in too much light.</color> |
=== Second Laser Alignment === | === Second Laser Alignment === | ||
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=== Finding a Beat Note === | === Finding a Beat Note === | ||
- | <WRAP right round box 450px>< | + | <WRAP right round box 450px>< |
- | Plug the fiber into either the D2-160 or D2-135-FC (obsolete). If using the D2-160, use a short RF SMA cable to connect the D2-160 to the D2-135-SMA. Look at the D2-135' | + | Plug the fiber into either the D2-160 or D2-135-FC (obsolete). If using the D2-160, use a short RF SMA cable to connect the D2-160 to the D2-135-SMA. Look at the D2-135' |
===== D2-135 Locking ===== | ===== D2-135 Locking ===== | ||
Getting a phase lock can be tricky, as the servo feedback must be pretty well optimized to your laser to get a phase lock. The narrower the linewidth of the laser and the higher the bandwidth of the laser, the easier it is to get a phase lock. The first step is to get an error signal with a steep slope at the desired offset frequency and then a basic lock. | Getting a phase lock can be tricky, as the servo feedback must be pretty well optimized to your laser to get a phase lock. The narrower the linewidth of the laser and the higher the bandwidth of the laser, the easier it is to get a phase lock. The first step is to get an error signal with a steep slope at the desired offset frequency and then a basic lock. | ||
- | Connect the D2-135' | + | Connect the D2-135' |
d2/quick_start_opls.txt · Last modified: 2021/08/26 15:26 by 127.0.0.1