High peak and average power Ti:sapphire thin disk amplifier with extraction during pumping.

Area of Science:

• Laser physics
• Optics and photonics

Background:

• Traditional multi-pass Ti:sapphire laser systems require cryogenic cooling to manage thermal effects.
• Thermal lensing and amplified spontaneous emission limit the power and efficiency of high-energy laser systems.

Purpose of the Study:

• To investigate the first-time application of the extraction during pumping (EDP) amplification scheme combined with thin disk (TD) technology for Ti:sapphire laser media.
• To demonstrate high energy broadband amplification at room temperature, overcoming limitations of traditional methods.

Main Methods:

• Proof-of-principle experiment using a room-temperature, water-cooled EDP-TD head.
• Amplification of stretched femtosecond pulses at a 10 Hz repetition rate.
• Comparison with cryogenically cooled, traditional multi-pass schemes.

Main Results:

• Successful high energy broadband amplification achieved in the EDP-TD Ti:sapphire laser head.
• Demonstrated operation at room temperature with water cooling, eliminating the need for cryogenic systems.
• Overcame thermal effects and transverse amplified spontaneous emission, enabling higher power output.

Conclusions:

• The EDP-TD combination is a viable and effective method for high-energy Ti:sapphire laser amplification.
• This approach overcomes thermal limitations, paving the way for Ti:sa lasers with petawatt peak and hundreds of watts of average power.
• Represents a significant advancement in laser technology, offering higher efficiency and reduced operational complexity.