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• http://www.qphotonics.com/Single-mode-fiber-coupled-laser-diode-2mW-840.html
• http://www.qphotonics.com/Single-mode-fiber-coupled-laser-diode-10mW-1060nm.html

Optics

Barrel connector from diode to attenuator: ADAFC1 mounted on bracket ADABD2

Adjustable attenuator (up to 50 dB):

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• 840 nm: get custom aligned version of F280FC-B
• 1060 nm: F220FC-1064

Neutral density filter (anti-reflective coating, why not) for fixed attenuation (between two retaining rings SM05RR - needs wrench spanner SPW603):

• 840 nm: NE530B-B for OD 1.9 (cuts 2 mW to 26 uW)
• 1060 nm: NE540B-B for OD 2.6 (cuts 10 mW to 28 uW)how much attenuation needed here?

Lens (in holder S05TM09 - does this need retaining rings? - needs wrench needs spanner SPW908):

• 840 nm: C280TME-B
• 1060 nm: C280TME-C

Get some extra retaining rings (two per tube) in case we need to clamp down the lens holder or something, who knows.

Mounting

3-inch lens tube: SM05M30

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Bottom of X stage is 3-3/8" high. Bottom edge of Z stage (Deltron LRS2-1) moves from 6-1/2" to 7-1/2" high.

Mounting plate sticks out 3.75" from the bottom edge of the Z stage.

About 1 m run from stage to the back of the hood; 1 m from back of hood to electronics.

Laser power scratch work

Sensor is 320 um thick, so MIP = 124 keV, or 2e-14 J.

840 um light is above bandgap so ~1/4 of the energy is wasted; 1060 um light has 150 um attenuation length so ~1/8 of energy is lost out the back. Ignore both effects.

Assume 2 ns pulse width, then we need 2e-14 J/2e-9 s = 1e-5 W, or 10 uW. If we use wider pulses we need to attenuate more.