全固态589 nm复合腔连续波和频激光器

给出了一种复合腔结构和频激光器,用2台激光二极管阵列(LDA)经过光纤耦合分别单独端面抽运Nd:YVO₄和Nd:YAG晶体,其中Nd:YVO₄和Nd:YAG晶体所选择的能级跃迁分别为⁴F_3/2-⁴I_11/2和⁴F_3/2-⁴I_13/2,其对应激光跃迁波长分别为1 064 nm和1 319 nm,两基频激光束分别在两个子谐振腔中振荡,在其交叠区利用KTP II类临界相位匹配(CPM)进行腔内和频,获得了589 nm的和频激光。当抽运功率为8 W/14 W时获得了340 mW连续波TEM₀₀黄激光输出。光束质量因子M²<1.2,激光输出功率噪声低,4 h功率不稳定度小于±3％。该复合腔结构是实现LDA泵浦589 nm全固态黄光激光器一种有效的和频方法。

All-solid-state continuous-wave doubly resonant all intra-cavity sum-frequency laser at 589 nm

A resonator designed for doubly resonant continuous-wave intra-cavity sum-frequency mixing (SFM) laser is studied. Nd:YVO₄ and Nd:YAG are pumped by two Laser Diode Array (LDA) which were coupled by optical fiber respectively, 1 064 nm wavelength is obtained from ⁴F_3/2-⁴I_11/2 transition in Nd:YVO₄ and 1 319 nm wavelength is obtained from ⁴F_3/2-⁴I_13/2 transition in Nd:YAG. Both laser beams are oscillated in two sub-cavity, and a KTP with type II Critical Phase Match (CPM) is used at the overlap of the two fundamental laser beams to realize the 589 nm SFM laser. An output power of 340 mW continuous-wave TEM₀₀ yellow laser could be obtained with 8 W/14 W pump power. The output power is with low noise and a M² factor of less than 1.2. The power instability is less than ±3％ within 4 h. Doubly resonant is an effective solution to realize 589 nm all solid state yellow laser pumped by LDA.