Abstract
A stable and simple Yb:YAG rod amplifier based on chirped pulse amplification in a water cooling system has been demonstrated. The output power of 38 W at a 250 kHz repetition rate with a spectrum width of 4 nm centered at 1030 nm, which support Fourier-transform limited pulse duration of 389 fs has been generated. The compressed power of 23.9 W with pulse duration of 985 fs has been obtained with a chirped volume Bragg grating compressor. The power stability is measured to be 1.414% when the output power is 35 W. The system is worthwhile to popularize for its good performance and inexpensive cost.
Highlights
High average power, high repetition rate ultrafast lasers have a promising prospect in science and industrial applications, such as attosecond pulse generation, materials processing and coherent control [1]–[3]
Cryogenic cooling technology is an effective way to produce high power, high repetition rate laser because Yb: YAG crystal’s quasi-three-level system in room temperature will be converted to four level system in cryogenic temperature [6], which is more efficient in laser amplification
With homemade all fiber laser which can output power of 7.4 W as the seeder, a maximum amplified output power of 38 W has been achieved at 250 KHz, which corresponds to optical-optical efficiency of 22.6%
Summary
High repetition rate ultrafast lasers have a promising prospect in science and industrial applications, such as attosecond pulse generation, materials processing and coherent control [1]–[3]. Based on cryogenic cooled Yb:YAG amplifier, 287 W, 5.5 ps at 78 MHz has been acquired, in which the optical-optical efficiency reaches 41% when the pump power is 700 W [7]. 40 mJ at 2 kHz repetition rate has been obtained based on two-stage cryogenic chirped-pulse Yb:YAG amplifier [5], in which the beam quality is below 1.1. 250 W output power at 100 kHz repetition rate with a super–Gaussian spatial [8] has been demonstrated based on four pass Yb:YAG amplification, the extraction efficiency reaches 50% with cryogenically temperature when the pump power is. Based on two stage cascaded thin disk multipass amplifier, 14 kW at 100 kHz repetition rate laser has been produced [11], which corresponds to pulse energy of 140 mJ. The amplification module shows good amplification performance, which is a promising substitute of single crystal fiber (SCF)
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