Cr: Tm: Ho: YAG; 2094nm; HTC:YAG-manufacture,factory,supplier from China

1. 4  ~ 3 μm laser crystals doped with Er2+, U4+, Ho3+, Dy3+  As an active ion, Ho3+ has achieved laser output in the ~3 μm band (5I6→5I7). In 1976, researchers first realized 2.9 μm laser output in Ho:YAP crystal. In 1990, Bowman et al. obtained 2.85 μm and 2.92 μm laser outputs in Ho:YAP crystals, and obtained 2.92 μm band-tuned laser outputs in Ho:YAP crystals in the following year. In 2017, Nie et al. pumped Ho, Pr: LiLuF4 crystals with a 1 150 nm Raman fiber laser, achieving 2.95 μm watt-level laser output for the first time. In 2018, Zhang et al.

MEASUREMENT TECHNIQUEThe measurement technique consists primarily of a measurement of the variation of the angle of deviation with temperature. The crystals to be measured were 60-60-60° prisms approximately 15 mm on a side. They were attached to a temperature-controlled mount in a vacuum chamber. The temperature could be varied by varying the temperature of a liquid bath above the mount. Temperature was measured by thermocouples attached above and below the crystal. The crystal temperature was assumed to be the average of the two temperatures.

Conclusion Considering comprehensive factors such as wide absorption bandwidth, large absorption cross section, long upper energy level lifetime (ms to tens of ms) (see Table 2), ion cross relaxation, increased quantum efficiency, and mature LD pump source, Tm3+ in the 2 μm band, Ho3+ and Er3+ in the 3 μm band must be one of the most important and basic laser sources in the mid-infrared band from 2 to 20 μm, and will compete with Nd3+ and Yb3+ in the 1 μm band.

03 Experimental results and analysisWhen the green light input power is lower than 4 W, the matching temperature of the BBO crystal has little effect on the output power of the quadrupled 266 nm laser, and when the optimal power of ultraviolet light output is achieved, the temperature offset ΔT of the heating device also tends to be consistent; when the green light input power is greater than 8 W, the higher the matching temperature of the BBO crystal (www.wisoptic.com), the smaller the temperature offset ΔT of the heating device, and the higher the output power of the 266 nm la

Experimental SetupIn order to obtain a 266 nm deep ultraviolet laser with high efficiency and stable operation, this paper built an all-solid-state 266 nm deep ultraviolet laser generation device as shown in Figure 1, which consists of a cavity-dumped all-solid-state Nd:YVO4 laser, a double-frequency system, and a quadruple-frequency system.Fig.

03 Experimental results and analysisBy optimizing the cavity length parameters of Nd:YVO4 (www.wisoptic.com) laser under high-power pump injection, a 1064 nm high peak power narrow pulse laser output with an average power of 26 W, a repetition frequency of 20 kHz, and a single pulse width of 5 ns was obtained when the 888 nm pump light power was 65 W; after the 1064 nm fundamental frequency infrared light was doubled by the LBO crystal, a 532 nm laser with a maximum power of 16 W was finally obtained, and the infrared to green light conversion efficiency reached 61.5%.

Introduction 532nm solid-state lasers are widely used in industry and medicine. In the field of scientific research, continuous, high-stability 532nm green light and kilohertz, high-energy nanosecond 532nm laser are the most ideal pump source solutions for titanium sapphire oscillators and amplifiers respectively. The basic route is to use an 808nm/880nm semiconductor laser as the pump source, generate a 1064nm laser in an Nd:YVO4 or Nd:YAG crystal, and then perform frequency doubling (SHG) through a frequency doubling crystal to generate a continuous or pulsed 532nm laser.

04 Theoretical study of thermal properties The above experiment shows that the BBO crystal (www.wisoptic.com) generates serious heat in the process of frequency quadrupling. It is known that the energy band gap of the BBO crystal is 6.56 eV, while the single photon energy of 266 nm and 532 nm lasers is 4.66 eV and 2.33 eV respectively. Theoretically, the crystal does not have single photon absorption of 266 nm and 532 nm lasers.

Introduction High-power all-solid-state deep ultraviolet (DUV) lasers have many important applications in scientific research, medical diagnosis, and industrial manufacturing, such as Raman spectroscopy, photobioimaging, integrated circuit etching, and precision micromachining, due to their compact structure, high single-photon energy, and good long-term stability.

2. Theoretical analysis2.1 Temperature robustnessTemperature robustness refers to the stability of the frequency-doubled crystal with respect to temperature. Specifically, when the temperature fluctuates, the power of the frequency-doubled light will not be greatly affected. The influence of temperature on the frequency doubling process mainly comes from the influence on the phase mismatch.