The design of the laser source is described at Laser4DIY Micro Chip Laser. Here we focus on assembling the laser source
The Micro Chip Laser block is our pulsed IR laser source and integrates several functionalities into one assembly:
Apart from the optical components, it consists of several parts, most of them are machined, either from copper (Cu), aluminum (Al) or acrylic (PMMA). These need to be mounted in the following order (bottom-to-top):
Additionally, the following is also needed
The STEP files for the machined parts can be found on github: https://github.com/Laser4DIY/LaserSource
Details on the other parts can be found in the BOM below.
For now, we only assembly the cooling stack. The optical components are added later, when the electrical and cooling setup is working.
Assemble the pieces in the order as listed above. Do not add optical components yet. The stacked parts are hold together by 4 M3 screws. MC-bracket-A and -B are hold by 2 M4 screws. Just screw them in loosely now, we will have to add the crystal later.
For setting up the optical components, we have chosen to use a custom bread board made from 8mm thick aluminum:
It features a grid of holes with M6 threads that allow the use of standard fixtures for optical components. The micro chip laser block is designed to be placed directly on the bread board as well, the height of the optical axis matches the one of standard components.
There is a 1 inch wide hole in the board, which can take up a beam expander mechanic and a lens. There the laser beam is mirrored downwards and focused onto the PCB lying on the table below.
The bread board is laser cut, you can find the dxf for it in the github repository: https://github.com/Laser4DIY/Laser4DIY_Enclosure/tree/main/lasercut/8mm_aluminum
Optical components are very sensitive!
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Now we start setting up the components for the laser source:
Item | Qty | Description | Part | Supplier | Comment |
Optical Components | |||||
1 | 1 | Nd:Yag Resonator wit Cr:Yag | Coupletech | custom, specs see Laser4DIY Micro Chip Laser | |
2 | 1 | Grin-Lens | GRIN2908 | Thorlabs | |
3 | 1 | Pumping-Diode | WSLD-808-010-E.FAC | EQ Photonics | |
4 | 5 | Clamp big | CF175 | Thorlabs | |
5 | 1 | Clamp middle | CF125 | Thorlabs | |
6 | 1 | Clamp Small | CF038 | Thorlabs | |
7 | 3 | Lens holding Assembly | 3 parts: PH20E/M + LMR1/M + TR20V/M | Thorlabs | |
8 | 1 | Clamp Micro | CL8 | Thorlabs | |
9 | 2 | Beam Expander Mechanic | 2 parts: SM1L05 + SM1V05 | Thorlabs | |
10 | 5 | Mirror Holder with Post | 2 parts: KM100 + RS1P4M | Thorlabs | |
11 | 2 | Mirror 1" 1064nm | NB07-K14 | Thorlabs | |
12 | 2 | Mirror 1" 532nm | NB07-K12 | Thorlabs | |
13 | (1) | Beamsplitter 1" 1064/808nm | DMLP900 | Thorlabs | Only needed for version with optical amplifier (details to be added) |
14 | 2 | Lens 1" f=50mm 1064nm | LBF254-050-C | Thorlabs | |
15 | 1 | Lens 1" f=75mm 53nm | LBF254-075-A | Thorlabs | |
16 | 1 | Mirror Holder Downwards | AB90A(M) | Thorlabs | |
17 | 1 | Lens 1" F=25mm 532nm | LB1761-A | Thorlabs | |
18 | 1 | Lens 1" F=-25mm 1064nm | LD2297-C | Thorlabs | |
19 | (1) | Amplifier Crystal Nd:Yvo4 | Only needed for version with optical amplifier (details to be added) | ||
20 | 1 | KTP Crystal SHG 1064nm | KTP Crystal 5x5x10mm | Shalom EO | |
21 | 1 | Crystal holder | AD5T | Thorlabs | |
Cooling | |||||
1 | Peltier Element 70W, 15V, 30 x 30 x 4 mm | Conrad | |||
1 | NTC 10k, ring lug mounting | e.g. Vishay NTCALUG01T103G501 | |||
2 | Screw connection, angled, R1/8 , Ø 8 mm | SMC KQ2L08-01AS | reichelt | ||
Other Components | |||||
1 | Indium Foil 50*50*0.1mm | Needed to wrap the laser crystal | |||
30 | Cable holder, self-adhesive | reichelt | Also useful for cable management in the whole device |