40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
  40m Log  Not logged in ELOG logo
Entry  Thu Apr 1 00:43:33 2010, Mott, Update, General, PZT response for the innolight Innolight_Bode.png
    Reply  Thu Apr 1 07:17:15 2010, Koji, Update, General, PZT response for the innolight 
       Reply  Thu Apr 1 10:21:58 2010, Mott, Update, General, PZT response for the innolight Innolight_Response.pngLightwave_response.png
          Reply  Thu Apr 1 10:47:48 2010, Koji, Update, General, PZT response for the innolight 
             Reply  Thu Apr 1 12:07:22 2010, rana, Update, General, PZT response for the innolight 
                Reply  Thu Apr 1 18:05:29 2010, Mott, Update, General, PZT response for the innolight Innolight_Response_calFix.pngLightwave_response_calFix.png
                   Reply  Thu Apr 1 18:44:40 2010, Koji, Update, General, PZT response for the innolight 
                      Reply  Thu Apr 1 19:59:32 2010, Mott, Update, General, PZT response for the innolight Innolight_AM_Response.pngInnolight_AM_PM.pngInnoVsLW_PM.pngInnolight_AM_Response.pngLightwave_AM_PM.png
                         Reply  Mon Apr 12 14:20:10 2010, kiwamu, Update, Green Locking, PZT response for the innolight 
                            Reply  Tue Apr 13 19:53:06 2010, Mott, Update, Green Locking, PZT response for the innolight and lightwave 6x
Message ID: 2756     Entry time: Thu Apr 1 19:59:32 2010     In reply to: 2755     Reply to this: 2788
Author: Mott 
Type: Update 
Category: General 
Subject: PZT response for the innolight 

 

 We measured the Amplitude Modulation response of the PZTs, to find regions with large phase modulation but small amplitude modulation.

We did this by blocking 1 arm of the PLL, feeding the source output of the Network Analyzer into the PZT input of the laser in question, and reading the output of the PD on the NA.  We calibrated by dividing by the DC voltage of the PD (scaled by the ratio of the AC gain to DC gain of the New Focus PD).

The AM response of the Innolight looks fairly smooth up to ~1MHz, and it is significantly below the PM response for most of its range.  The region between 20 and 30 kHz shows very good separation of about 10^3 rad/RIN (and up to 10^5 rad/RIN at ~21.88 kHz, where there is the negative spike in the AM response). The region between 1.5 MHz and 2MHz also looks viable if it is desirable to actuate at higher frequencies.

The Lightwave offers very good AM/PM separation up to about 500 kHz, but becomes quite noisy about 1MHz.

Attachment 1: Innolight_AM_Response.png  19 kB  | Hide | Hide all
Innolight_AM_Response.png
Attachment 2: Innolight_AM_PM.png  35 kB  | Hide | Hide all
Innolight_AM_PM.png
Attachment 3: InnoVsLW_PM.png  28 kB  | Hide | Hide all
InnoVsLW_PM.png
Attachment 4: Innolight_AM_Response.png  19 kB  Uploaded Thu Apr 1 21:03:14 2010  | Hide | Hide all
Innolight_AM_Response.png
Attachment 5: Lightwave_AM_PM.png  27 kB  Uploaded Thu Apr 1 21:03:31 2010  | Hide | Hide all
Lightwave_AM_PM.png
ELOG V3.1.3-