Double-QW Gain Chip

Pulse Width Nearly Halved

Compared with single-quantum-well gain chips, the double-quantum-well structure weakens narrowband filtering and reduces group delay dispersion, reducing mode-locked pulse width by 46% while improving thermal characteristics and wavelength tuning range.

Zhenglu, Chen · Tao, Wang · Zhu, Renjiang · Jiang, Lidan · Jiang, Maohua · Tong, Cunzhu · Fanghong, Zhang · Zhang, Peng

Optics and Laser Technology 2026

Specifications

Pulse width reduction

{'zh': '46', 'en': '46'} %

Red shift rate reduction

{'zh': '33', 'en': '33'} %

Wavelength tuning range extension

{'zh': '26', 'en': '26'} %

Advantages

Pulse width nearly halved

The double-quantum-well structure weakens narrowband filtering and reduces group delay dispersion, leading to a 46% reduction in SESAM mode-locked pulse width compared to the single-quantum-well case.

Less wavelength drift

The red shift rate of emission wavelength with increasing temperature is reduced by 33% for the double-well gain chip, indicating better thermal stability.

Broader tuning range

The wavelength tuning range of the continuous-wave double-well SDL is extended by 26% compared to the single-well SDL, increasing versatility.

Applications

• Ultrafast Lasers：Shorter pulse width enhances ultrafast laser performance for high-temporal-resolution applications.
• Optical Frequency Combs：Broader tuning range and stable wavelength facilitate wider-spectrum frequency combs.
• Precision Optical Metrology：Stable wavelength and shorter pulses improve precision in metrology.
• Pulsed Laser Processing：Shorter pulses and higher peak power suit precision material processing.