…nm/˚C Bragg Mirror Reflectivity 5 10-98 >99.9 % Reflectivity Tolerance 1 -5 — +5 % Grating Slant Angle — Features & Benefits
* Increases spectral brightness of lasers
* Reduces thermal dependence of lasers
* Reduces unwanted spectral components
* Ultra-narrow bandwidth
* Low loss
* Highly stable…
4. Micromirror array
A DLP micromirror array 1264 x 768 from Texas Instruments was obtained from a
commercial projector. The mirror pixel size was not specified but was estimated to be 10 m
x 10 m. The DLP is connected to the board by a flexible cable, which enabled alignment of
anticipate that the concept can also be applied to arrays and stacks of high power laser diodes.
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Reflectivity and Phase (GDD) control
· A wavelength range 600 nm to 1000 nm is
· Silver mirrors have a naturally flat phase at
600 nm to 1000 nm and work reasonably well.
The down-side is the relatively high 3% loss
…has a physical
dimension of 13×3×14 mm. The thickness of 14 mm results in a narrow reflective bandwidth
of ~ 0.013 nm (~7 GHz). The reflection band is centered at 763.8 nm and the reflectivity is
about 25%. The light-passing surfaces on microlenses and VBG are all AR coated.
such nontraditional highly aspheric/freeform optics. With traditional optics, you
1220s: Development of glass.
1222: Broad sheet glass was first produced
in Sussex, England.
1500s: Development of mirrors. The method
of making mirrors out of plate glass was
…This was tested beyond
normal operation by measuring the wavefront of a
reference laser beam reflected off the OPSL chip (i.e.
with there the chip acts as passive mirror). Even when
pump power was focused to a small spot diameter on
the OPSL chip, thus creating thermal…
…alignment within a beam delivery system, and degradation in the performance of individual beam delivery optics (such as a drop in reflectivity on a mirror). Pulse shape is also an important parameter, particularly for applications in the thermal processing regime that commonly utilize modulated…
…laser diode in an external cavity laser (HECL) configuration was detailed by Accuwave Corporation in 19932. Reflection mode VHGs (also called Volume Bragg gratings (VBGs), Bragg mirrors, bulk Bragg gratings, or 3-D Bragg gratings) utilize a photosensitive bulk material in which a periodic change…
…produce different lines, the first step in determining the operating wavelength is to use cavity mirrors that are highly reflective
only at the desired wavelength. The low reflectivity of the mirrors at all the other lines will prevent these from reaching the threshold for laser action.
…uniform distribution of RF energy along the
electrodes (see Figure 2-4).
One of the 100% reflecting end mirrors partially covers the electrode
area. The gap at the end of the mirror forms the output path for the
laser beam. The beam exiting in this gap passes through a zinc
…rear of the machine and travels through a series of mirrors
converting the linear polarized source laser beam to circular polarization, and also providing feedback isolation to protect the laser
from excess surface material reflections. It then encounters a
2-mirror periscope which…