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Picosecond kilohertz-class cryogenically cooled multistage Yb-doped chirped pulse amplifier
Optics Letters
|February 16, 2017
Summary
A new cryogenic chirped pulse amplifier uses two Yb-doped gain materials for broader bandwidth. This laser system achieves high pulse energy and average power with excellent beam quality.
Area of Science:
- Laser Physics
- Materials Science
Background:
- Chirped pulse amplification (CPA) is a technique for amplifying ultrashort laser pulses.
- Yb-doped gain media are widely used in high-power laser systems.
Purpose of the Study:
- To develop a multistage cryogenic chirped pulse amplifier with enhanced bandwidth.
- To investigate the performance of a hybrid gain medium system.
Main Methods:
- Utilized a Yb:GSAG regenerative amplifier followed by a Yb:YAG power amplifier.
- Operated the system at cryogenic temperatures and a 1.25 kHz pulse repetition frequency.
Main Results:
- Achieved 90 mJ uncompressed and 67 mJ compressed pulse energy.
- Demonstrated 113 W uncompressed and 84 W compressed average power.
- Obtained a pulse width of 3.0 ps FWHM and near-diffraction-limited beam quality (M²<1.3).
Conclusions:
- A hybrid Yb:GSAG/Yb:YAG system offers broader bandwidth than single-gain-medium systems.
- The developed cryogenic CPA system delivers high energy and power with excellent beam quality.
