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Laser Material Processing Laboratory

Laser material processing laboratory develops valuable experimental protocols for managing glass based photonic structures. Among the others we evidence the smoothing of planar waveguide surface in order to reduce scattering losses and the fabrication of transparent glass ceramic waveguides.


Instrumentation:

Laser CO2 TEA S50 made by BCC LLC Bulgaria


Figure 1: TEA CO2 laser system for laser material processing


Technical Data:

 Gas mixture  CO2 33%, He 33%, N2 33%
 Energy per pulse  0,8 Joule in Multimode, 150 mJ TEM00
 Pulse length  typically 380 nsec = 2 MW for pulse
 Repetition rate  from 1 Hz to 100 Hz
 Beam dimension  15mm x 15mm in multimode
8 mm in TEM00
 Divergence  3,5 mrad in Multimode
1,3 mrad in TEM00
 Time for ready  10 - 15 min
 Max energy consumption  4KW



Figure 2: Optical bench for CO2 laser material processing
(a) beam output (b) beam collimator (c) lens (d) sample holder
(e) power meter head S314C (f) power meter electronic PM100D


Lens:

 N.2 ZnSe lens plano-convex
 OPHIR - LP 38-127-3.0
 Diameter: 38.1 mm (1.5"), Focal length: 127.0 mm (5.0"), Edge thickness: 3.0 mm
 Standard coating (transparent, A < 0,2%)
 N.2 ZnSe Cylindrical Lens
 ULO Optics - 15ZCP100
 Diameter: 38.0 mm, Focal length: 100.0 mm, Edge thickness: 3.0 mm
 Coating AR/AR


Power meter:

  • Thorlabs Optical Power Meter PM100D
  • With Thermal Sensors for General Applications - S314C and S302C
   S314C  S302C
 Wavelength Range  0.25 - 11 µm  0.19 - 25 µm
 Power Range  10 mW - 40 W  100 µW - 2 W
 Detector Type  Thermal Surface Absorber  Stabilized Thermal Absorber
 Resolution  1 mW  1 µW


Figure 3: Power meter PM100D


Tapered fiber fabrication setup

Tapered fiber is one of the more frequently used methods to inject the light in a microresonators. The typical example is the add-drop configuration used for spherical microresonators. Hence is crucial to develop the skill in the artisanal fabrication of the tapers. Using the home-made setup shown in Figure 4 tapered fibers with a 1 µm waist can be prepared.



Figure 4: Tapered fiber fabrication setup