External cavity scheme used for device characterization
(top view)
(side view)
The Gain-Module is a similar device to the Gain-Chip, but has one side coupled into single mode fiber. It is greatly applicable for building tunable lasers with a fiber output. Factory made fiber coupling ensures optimized coupling efficiency, long-term stability and excellent reliability. The Gain-Module eliminates the need for a number of components typically used in schemes with a bare Gain-Chip, thus substantially improving system reliability and reducing costs. A further feature of the Gain-module is temperature stability due to the built-in TEC and a high precision thermistor.
The device comprises a Gain-chip of "Type C" with a curved stripe. The facet where the stripe is tilted is designed for external feedback and features deep AR coating, resulting in extremely low back-reflection to the chip waveguide. It ensures the blocking of self-lasing and as well eliminates issues related to the compound cavity when operating in the external cavity system. This results in a very fine spectral line with high Side-Mode Suppression Ratio (SMSR) inherent across the full tuning range. The facet with a perpendicular stripe has the appropriate reflection (typically in the range of 5-15%) to simultaneously provide broad wavelength tuning with high output power. Reflection of this facet in a standard device is optimized for operation in an external cavity setup which provides efficient feedback (about 50%) to the chip (schematically shown in the picture). For schemes with lower feedback, we would recommend a customized device with a different coating on the facet to provide optimized reflection.
Tips for designing the external cavity:
Note: The operating wavelength, facet reflection and other parameters can be optimized for a particular application and design of external cavity system. Our knowledgeable Application Team is ready to consult and advise on the optimal solution based on your needs and application. Please, for a customized solution.
Part number indentification: GC-1030-130-YY-200
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Available fibers: PM:
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Typical parameters* of gain-modules |
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Part number | Central wavelength of tuning range |
Tuning range width |
Wavelength of maximum power |
Output power ex fiber |
Fast axis beam divergence |
Slow axis beam divergence |
Ripples (RMS) |
Stripe length |
Operating current |
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nm | nm | nm | mW | deg | deg | dB | mm | mA | |||
GM-1030-150-YY-150 | 1030 | 150 | 1060 | 150 | 36 | 7 | 0.3 | 1.4 | 400 | ||
GM-1030-130-YY-200 | 1030 | 130 | 1050 | 200 | 19 | 7 | 0.2 | 2.8 | 400 | ||
GM-1060-150-YY-250 | 1060 | 150 | 1100 | 280 | 16 | 6.5 | 0.1 | 3 | 600 | ||
GM-1140-120-YY-130 | 1140 | 120 | 1170 | 130 | 39 | 6 | 0.05 | 3 | 600 |
* - @ CW, 25C heatsink temperature, external cavity in Littrow configuration with ≈50% feedback
Any customized wavelength from the 780-1330 nm range is possible. Please, for the details.