30  W single-frequency continuous-wave master oscillator power amplifier laser at 1342  nm

Abstract

We present a power-scalable high-power single-frequency continuous-wave 1342 nm master oscillator power amplifier (MOPA) system that consists of a polarized single-frequency 1342 nm LD seed laser, a Raman fiber preamplifier, and a three-stage N d : Y V O 4 power amplifier. The single-frequency output power of 30 W at 1342 nm is achieved with the beam quality factors M 2 = 1 . 26 , and the power stability for 1 h is better than ± 0 . 5 % .

Wavelength tunable continuous wave single-frequency 1342 nm amplifier exceeding 44 W

“…This system consisted of a distributed feedback laser (DFB) diode seed laser, a Raman fiber pre-amplifier, and fivestage Nd:YVO 4 rod amplifiers. After improving the cooling structure of the heat sinks and optimizing the laser mode and pump power, an output power of 44.1 W. Compared with our previous results [13] both beam quality and output power have been improved. As far as we know, this is the highest power from a continuous-wave single-frequency 1341.6 nm amplifier based on a Nd:YVO 4 rod structure.…”

“…Meanwhile, the MOPA method also allows us to tune the laser in a large range, so that we can easily align the absorption peaks of different isotopes of lithium in cold atom experiments. Recently, we have demonstrated a high power singlefrequency 1342 nm MOPA system with a output power of 30 W, where the beam quality factors of M 2 for the laser were measured to be 1.25 and 1.26 along the horizontal and vertical directions, respectively [13]. For obtaining higher output power with good beam quality, increasing the number of laser amplifiers and optimizing the system in a fine way is effective.…”

12.6 W single-frequency continuous-wave 671 nm laser with an external second harmonic generation cavity

“…Finally, we acquire a 30 W single-frequency CW 1342 nm TEM 00 mode laser with an aperture blocking the higher-order modes. More details were described in [14].…”

“…An optical isolator ISO2 is used to prevent the backward propagating light from the power-amplifier. More details are described in [14].…”