Timeline for Ultra-narrow beam spread LASER diode
Current License: CC BY-SA 4.0
16 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Apr 4, 2020 at 9:07 | vote | accept | Gab | ||
| Apr 3, 2020 at 18:56 | answer | added | WhatRoughBeast | timeline score: 1 | |
| Apr 3, 2020 at 18:52 | answer | added | analogsystemsrf | timeline score: 1 | |
| Apr 3, 2020 at 18:38 | comment | added | DKNguyen | Roithner laser tech has the cheapest collimators and mounting tubes to hold the lens and TO package that I have found: roithner-laser.com/ld_mounts.html | |
| Apr 3, 2020 at 18:37 | comment | added | tuskiomi | what do you need as a beam arclength? most modern lasers have around 6mrad (0.34 degrees). | |
| Apr 3, 2020 at 17:34 | answer | added | user1850479 | timeline score: 2 | |
| Apr 3, 2020 at 17:31 | comment | added | Gab | @jonathanjo No it's not, but I would like it to be at least about 20 cm | |
| Apr 3, 2020 at 17:30 | comment | added | Gab | @ThePhoton Yes I understand that reducing the divergence angle would also increase the beam diameter. 0.5 degree FWHM is barely acceptable for my application and would lead to around 2mm of beam diameter at 20 cm. | |
| Apr 3, 2020 at 17:30 | comment | added | Marcus Müller | @ThePhoton ah, true; I wonder whether a camera lens (used one with one of the old screw mounts) with the laser source being in the film plane, and the focal distance set to infinity, would do in a pinch. Might need to try this out... | |
| Apr 3, 2020 at 17:28 | comment | added | jonathanjo | Is the distance between the laser and the sensor fixed? | |
| Apr 3, 2020 at 17:26 | comment | added | Spehro 'speff' Pefhany | An ordinary cheap laser module has a dot about 1mm diameter at 30cm if you adjust the focus (not all have adjustable focus). | |
| Apr 3, 2020 at 17:25 | comment | added | The Photon | @MarcusMüller, it looks like this device is already quite well collimated. A beam expander or telescope is probably a better fit here. Or choose a more divergent laser, and use a collimator, but then a 2nd beam-expander lens might also be needed to get better than 1 degree divergence. | |
| Apr 3, 2020 at 17:23 | comment | added | The Photon | It sounds like you already understand there's a fundamental trade-off between beam diameter and divergence angle, is that correct? It looks like the Hamamatsu part is at least typically quite a bit better than 1 degree, maybe 0.5 degrees FWHM. Is that not accpetable for your application? | |
| Apr 3, 2020 at 17:22 | comment | added | Axis | thorlabs.com/… | |
| Apr 3, 2020 at 17:21 | comment | added | Marcus Müller | collimator lens. | |
| Apr 3, 2020 at 17:17 | history | asked | Gab | CC BY-SA 4.0 |