Differences

This shows you the differences between two versions of the page.

--- d2:dbr_laser [2019/09/24 21:11] – [Inputs, Outputs, and Controls] Michael Radunsky
+++ d2:dbr_laser [2019/09/24 21:26] – [Description] Michael Radunsky
@@ Line 17: / Line 17: @@
 =====Description=====
+<WRAP center round box 60%>
+| {{ :warning-sign.png?200&nolink }}    | The D2-100 laser module is factory aligned.  It is not advised that the user attempts to re-align the laser in the field.  If the laser becomes misaligned, please return the unit to the factory for realignment.  |
+</WRAP>
 The DBR laser module is comprised of a distributed feedback (DBR) laser diode in a precision temperature-controlled housing with beam conditioning optics and an optical isolator.  DBR laser diodes are fabricated with the feedback grating patterned directly over the gain section of the diode.  They are highly immune to vibrations and by virtue of a very short cavity (~ 1 mm), they can be current tuned over more than 50 GHz.  The result is a robust laser capable of very fast servo control for easy locking to atomic transitions.  The module contains no moving parts or piezo-electrics and is therefore inherently robust and rugged.
@@ Line 76: / Line 81: @@
-=====Inputs, Outputs, and Controls=====
+=====Laser Control Signals=====
-**Cable Connector**
+==== Temperature Control Loops ====
 The connections to the TECs and thermistors are made to an 8-pin Hirose connector (see <tabref TECconnectortable> for identity of connectors).  The pin definitions are:
@@ Line 108: / Line 113: @@
 NOTE:  Earlier models use a push-pull connector for the 8-pin connector to the DBR module.  To remove take care to apply opposition forces with the thumb and forefinger knuckles against the housing.  Excessive force could displace the output beam and require realignment.
-**Laser Current (SMA)**
+==== Laser Current (SMA) ====
 <WRAP center round important 60%>
 Never connect or disconnect the D2-100 Laser to a laser controller that is energized.  Always power down the laser controller completely before making connections to this laser.
@@ Line 120: / Line 125: @@
-=====Aligning the DBR Laser Module=====
-The module should not need adjustments, but if necessary the following procedure can be used to fine tune the beam positioning.
-  - Loosen the three locking screws on the back of the DBR module ½ turn past the crack point.
-  - With a 0.050" Allen driver, adjust the vertical adjustment setscrew on the top of the DBR housing to level the beam.
-  - Adjust the horizontal adjustment 4-40 set screw on the left side of the DBR housing (See <imgref DBR_lock_screws>).
-  - Alternatively, use the spectroscopy module as a beam target.  Place the spectroscopy module as far down the table as possible, bolt it down, and center the beam to the input hole.
-  - Gently retighten the three locking screws.