[Paper Review] 1.1 kW, 100 Hz room-temperature diode-pumped nanosecond laser by water immersion cooling

Xinxing Lei, Suyang Wang+4 more|arXiv (Cornell University)|Jan 7, 2026

Solid State Laser Technologies1 citations

TL;DR

Demonstrates a room-temperature diode-pumped solid-state laser with water immersion cooling delivering 11 J pulse energy at 100 Hz and 7 ns pulse duration, achieving 1.1 kW peak power with a beam quality 2.6× diffraction limit.

ABSTRACT

We report a room-temperature diode-pumped solid-state laser by water immersion cooling, which delivers a pulse energy of 11 J at the repetition rate of 100 Hz and the pulse duration of 7 ns, while the beam quality factor is 2.6 times the diffraction limit. To the best of our knowledge, this represents the highest performance achieved for room-temperature nanosecond lasers operating above 100 Hz, which demonstrates the great potentials of room-temperature immersion-cooled nanosecond active mirror lasers.

Motivation & Objective

• Demonstrate high-energy, room-temperature nanosecond laser performance using water immersion cooling.
• Assess pulse energy, repetition rate, pulse duration, and beam quality in a water-immersion cooled active-mirror laser.
• Show potential of immersion-cooled nanosecond lasers for high-average-power operation at room temperature.

Proposed method

• Utilize water immersion cooling for a diode-pumped solid-state laser.
• Deliver 11 J pulse energy at 100 Hz with 7 ns pulse duration.
• Characterize beam quality, reporting it as 2.6× the diffraction limit.
• Operate at room temperature to assess performance limits of immersion-cooled active-mirror configuration.

Experimental results

Research questions

• RQ1 Can water immersion cooling enable high-energy, room-temperature nanosecond operation at Hz repetition rates?
• RQ2 What pulse energy, duration, and beam quality are achievable with diode-pumped immersion-cooled active-mirror lasers at 100 Hz?
• RQ3 How does immersion cooling impact peak power and beam quality compared to conventional cooling?
• RQ4 Is 1.1 kW peak power attainable in a room-temperature nanosecond laser at 100 Hz?

Key findings

• Pulse energy of 11 J achieved at 100 Hz.
• Pulse duration of 7 ns achieved.
• Beam quality factor is 2.6 times the diffraction limit.
• Demonstrates highest performance reported for room-temperature nanosecond lasers above 100 Hz (per abstract).
• Shows strong potential of room-temperature immersion-cooled nanosecond active-mirror lasers.