Passive mode-locked cesium diode-pumped alkali laser.

Area of Science:

• Laser Physics
• Quantum Optics
• Materials Science

Background:

• Diode-pumped alkali lasers (DPALs) are efficient sources of coherent light.
• Mode-locking is crucial for generating ultrashort laser pulses.
• Passive mode-locking offers simpler system designs compared to active methods.

Purpose of the Study:

• To demonstrate passive mode-locking in a diode-pumped alkali laser (DPAL) for the first time.
• To investigate the generation of ultrashort pulses from a passively mode-locked DPAL.
• To characterize the performance of the developed mode-locking technique.

Main Methods:

• Utilized an intracavity cesium vapor cell buffered with methane for passive mode-locking.
• Employed a continuously pumped cesium DPAL with a static gain medium.
• Observed pulse trains using a high-bandwidth detector (2.0 GHz).

Main Results:

• Achieved passive mode-locking in a DPAL system.
• Observed pulse durations less than 460 ps, limited by detector bandwidth.
• Calculated a minimum pulse duration of 57 ps.

Conclusions:

• Successfully demonstrated the first passive mode-locking in a DPAL.
• The technique enables the generation of ultrashort pulses from DPALs.
• This advancement opens possibilities for compact and efficient ultrashort pulse laser sources.