If you have a problem with a laser beam focusing and the laser beam spot is not small enough you may use a digital microscope for the laser beam focusing process
You may use a USB digital microscope for laser beam focusing and check laser beam focus quite easily and see the image of the laser spot on your computer or cell phone
there are plenty of such microscopes on the market
Move the laser up and down to get the minimum laser beam spot.
Parameters of a digital microscope
Specifications:
Image Sensor: 0.3M HD CMOS Sensor (Digital 2M)
Controller: High-Speed DSP
Lens: Micro-Scope Lens
Focus Range: Manual Focus from 0~200mm
SnapShot: Software and Hardware
Video Capture Resolution: 640×480
Still Image Capture Resolution: 1600×1200(2M Pixel),1280×960(1.3M Pixel),800×600, 640×480
Frame Rate: Max. 30f/s Under 600 Lux Brightness
Flicker Control: 50Hz / 60Hz Option
Video Format: AVI
SnapShot Format: JPEG
Light Source: 8 White Light LED (with adjust controller on USB cable)
Magnification Ratio: 250-1000X (Manual)
Power Supply: USB Port (5V DC)
Software: Driver and Measurement
System Requirement: Pentium Computer with 700MHz & Above, 20M HD Space CD ROM Driver, 128MB RAM, Direct X VGA Card
PC Interface: USB2.0 & USB1.1
Operation System: WIN XP/VISTA/WIN 7/8 32 Bites & 64 Bites
| Product Key Features | |
| Magnification Range | 250x |
| Custom Bundle | No |
| Viewer | Monitor/Display |
| Microscope Structure | Upright |
| Modified Item | No |
| Microscope Type | Digital Microscope |
| Dimensions | |
| Weight | 0.6lb. |
| Width | 16cm |
| Height | 6cm |
| Length | 23cm |
| Additional Product Features | |
| Non-Domestic Product | No |
| Type | Digital Microscope |
| Intended Use/Discipline | Laboratory |
Digital microscope mount
https://www.thingiverse.com/thing:4544718
Use an Endurance laser for object highlighting
