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groups:mg:project_ptb-cavity:mode_matching_second_try [2017/09/07 08:35] – ssauergroups:mg:project_ptb-cavity:mode_matching_second_try [2017/10/04 11:50] (current) – ssauer
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-====== Mode Matching - second try ======+====== Mode Matching - two curve mirrors ======
  
 ==== Mirror configuration ==== ==== Mirror configuration ====
 +{{ :groups:mg:project_ptb-cavity:img_3440.jpg?400|}}
 ==Parameter== ==Parameter==
     * Radius of curvature of mirror R1: R1= 1 m     * Radius of curvature of mirror R1: R1= 1 m
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       * mirror R2/lense 1 and lense 2: X       * mirror R2/lense 1 and lense 2: X
       * mirror R2/lense 1 and collimatorlense: 600mm - X       * mirror R2/lense 1 and collimatorlense: 600mm - X
-        * 615mm = optical way of the incoupling breadboard (450mm) + thickness breadboard (10mm) + distance between breadboard and vacuumchamber (30mm) + distance between vacuumchamber and cavity mirror R2 (130mm)  +        * 600mm (+15mm) = optical way of the incoupling breadboard (450mm) + thickness breadboard (10mm) + distance between breadboard and vacuumchamber (30mm) + distance between vacuumchamber and cavity mirror R2 (130mm)  
-      * collimatorlense and fiber: 2.75 µm+      * collimatorlense and fiber: 2.75 mm
  
 We used the programm //Strahl.exe// (@IQ) or //STRAHLFP.EXE// (@PTB) (same software, but different names).\\ We used the programm //Strahl.exe// (@IQ) or //STRAHLFP.EXE// (@PTB) (same software, but different names).\\
 +**Step 0: Choose parameter**\\
 +  * Wellenlänge: 1542 nm
 +  * Brechungsindex: 1 (Air)
 +
 +  * Welcher Resonatortyp: linearer Resonator
 +
 **Step 1: Beam waist calculation from resonator**\\ **Step 1: Beam waist calculation from resonator**\\
 +  * Nr. 1: Spiegel 1 with Brennweite  500 mm; Einfallwinkel: 0
 +  * Nr. 2: Abstand 480 mm
 +  * Nr. 3: Spiegel 2 with Brennweite  500 mm; Einfallwinkel: 0
  
-**Step 2: **\\+-> Waistradius: 457 µm; Strahlradius on the mirrors: 525.2 µm\\  
  
 +**Step 2: **\\
 +  * Change Spiegel 2 to Linse 1
 +    * Brechungsindex: 1.5
 +    * Brennweite: -2000 mm
 +<note important>The values of the Waistradius and Strahlradius must not change!!!</note>
 **Step 3: **\\ **Step 3: **\\
 +  * Nr. 4: Abstand with Variable X
 +  * Nr. 5: Linse 2 with Variable Y
 +  * Nr. 6: Abstand 600 - X
 +  * Nr. 7: Linse 3 with Brennweite 2.75 mm
 +  * Nr. 8: Abstand 2.75 mm
 +
 +  * Zielwaist: 5.2 µm
 +**Step 4: Playing with the parameters X and Y for the best Überlapp**\\
  
-**Step 4: **\\+Case: //Mirror R2/lense 1 and collimatorlense: 600mm - X// 
 +^ Lense focal length Y [mm]                      |  400   |  300   |  **250**   |  200   |  175   | 
 +^ Distance between mirror R2 and lense 2 X [mm]  |  179    |  208   |  **243**   |  316   |  357   | 
 +^ Überlapp [%]                                   |  83.1  |  97.6  |  **99.5**  |  87.9  |  77.4  |
  
-**Step 4b**\\+Case: //Mirror R2/lense 1 and collimatorlense: 615mm - X// 
 +^ Lense focal length Y [mm]                      |  400   |  300   |  **250**   |  200   |  175   | 
 +^ Distance between mirror R2 and lense 2 X [mm]  |  170   |  215   |  **265**   |  332   |  357   | 
 +^ Überlapp [%]                                   |  83.2  |  97.9  |  **99.2**  |  87.0  |  76.3  |
  
 +**Step 5: Check what is happend for the wavelength 1560 nm**\\
  
 +No effect!