SAF Gain Chips, 1320 nm Center Wavelength

InP Gain Chip on Submount or Submount with Heatsink
Ultra-Low Reflectance at Angled Facet
Custom Coatings Available

Actual Size Compared
to US One Cent Coin

SAF1144C

Chip on Submount

SAF1144H

Chip on Submount
with Heatsink

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Overview
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Parameter	Min	Typ	Max
Operating Current (I_OP)	-	600 mA	800 mA
Center Wavelength	1290 nm	1320 nm	1340 nm
ASE Power @ I_OP	10 mW	20 mW	-
Peak Gain @ I_OP	-	30 dB	-
Optical Bandwidth	30 nm	50 nm	-
Gain Ripple (RMS) @ I_OP Res. BW = 0.1 nm	-	0.35 dB	1 dB
Angled Facet Reflectivity	-	0.005%	0.01%
Normal Facet Reflectivity	-	10%
Forward Voltage	-	1.3 V	1.8 V
Chip Length	-	2.0 mm	-
Waveguide Refractive Index	-	3.2	-
Lateral Beam Exit Angle	-	26.5°	-
Transverse Beam Divergence (FWHM)	-	28°	-
Lateral Beam Divergence (FWHM)	-	12°	-

Features

Broad Tuning Range
High Output Power
Ultra-Low Angled Facet Reflectance: 0.005% (Typ)
Gain Medium for Narrow Linewidth Fiber Bragg Grating Lasers
Gain Medium for Widely Tunable External Cavity Semiconductor Lasers

Single Angled Facet (SAF) gain chips use a geometric technique to further reduce the reflection on one end of the chip by curving the ridge waveguide so that it is not normally incident to the chip facet. This, in combination with an AR coating on that facet, virtually eliminates back reflections that can create unwanted feedback into the laser cavity. As a result, SAF gain chips are superior to standard gain chips when used in Extended Cavity Lasers (ECLs), particularly tunable ECLs, since any residual reflection from the AR-coated Fabry-Perot (FP) gain chip facet often limits the stability, output power, and spectral quality of the laser.

Our 1320 nm SAF gain chip is available in two configurations. The SAF1144C chip is offered on a submount, while the SAF1144H is provided on the same submount with a heatsink and connected cathode and anode leads.

Other SAF Gain Chips
1320 or 1550 nm Chip in Half Butterfly
1220 nm Chip on Submount or Heatsink
1450 nm Chip on Submount or Heatsink
1550 or 1590 nm Chip on Submount or Heatsink
1650 nm Chip on Submount or Heatsink

Sample Results of an SAF1144 Used in a Basic Littman-Metcalf Configuration

SAF1144 Performance in a Littman Metcalf Cavity

For more information on using a SAF gain chip in an external cavity laser see the online External Cavity Diode Laser Tutorial.

Click to Enlarge

Click to Enlarge
Diagram of the Anode and Cathode Pins of the SAF1144C

Click to Enlarge
Diagram of the Anode and Cathode Pins of the SAF1144H

Posted Comments:

leosolutions1 (posted 2017-02-13 20:03:26.343)

Dear Madam or Sir, I would like to use your SAF1144C Single Angle Facet Gain Chip, but my setup requires a Ø9mm package, for instance as used in M9-915-0300. Could you provide the Ø9mm packaging also for the SAF1144C? Thank you, Barbara -- Laser & Electro-Optic Solutions via della Terra, 47 I-38068 Rovereto Italy email: leosolutions1@gmail.com www.leosolutions.it

tfrisch (posted 2017-02-16 02:08:23.0)

Hello Barbara, thank you for contacting Thorlabs. In most applications, both facets of the SAF1144C are used, and in my experience most 9mm diameter packages have only 1 window from which light could enter or exit the package. I will reach out to you directly about the geometry of your application.

avle (posted 2013-04-03 03:37:32.637)

Could you send a custom quote for SAF1144H with a 90% reflectivity coating instead of 10?

jlow (posted 2013-04-03 13:27:00.0)

Response from Jeremy at Thorlabs: We will get in contact with you on the quote.

bdada (posted 2011-10-06 19:52:00.0)

Response from Buki at Thorlabs: The standard SAF1144H with 10% AR coating has a cavity length of 2mm. For a 90% AR equivalent of SAF1144H, we would recommend a 1mm cavity length. We can provide a custom version with a 90% AR coating and we will contact you directly to discuss the details.

votava (posted 2011-10-06 05:50:25.0)

Hello, this is rather a question than a comment. I would like to ask if the SAF1144H gain chip is also available with the 90% normal facet reflectivity (as is offered with the 1450nm gain chip). I would like to use both chips in identical external cavity laser designs for compatibility. Thank you in advance for your information, with best regards, Ondrej Votava, Ph.D.