RU2398324C1 - Active material for liquid optical quantum generators and amplifiers - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: active material contains phosphorus oxotrichloride (POCl₃), boron trichloride and neodymium trifluoroacetate Nd(CF₃CO₂)₃. The ingredients can be taken in the following quantitative ratio in wt %: phosphorus oxotrichloride 85-98, boron trichloride 1-10, neodymium trifluoroacetate 0.2-5.0. Boron trichloride may contain the ¹⁰B isotope in amount of 20-95% of the total weight of boron isotopes.

EFFECT: high output power of laser radiation.

3 cl

Description

The invention relates to the field of creating new liquid laser materials suitable for use in optical quantum generators (OCGs) and optical quantum amplifiers (OCUs) both with conventional optical pumping and with pumping products of nuclear reactions.

Known active material activated by rare-earth elements for optical quantum generators and optical quantum amplifiers (AS USSR No. 330505, priority dated 11/23/1966, IPC H01S 3/14. Belan VR, Zhabotinsky ME, Zolin V .F. Et al. Active material activated by rare-earth elements for optical quantum generators and optical quantum amplifiers. Publ. Bul. No. 8, 1972). In a known technical solution, the active material consists of the following ingredients, weight%:

phosphorus oxychloride 15-90 metal halides 1-60 rare earth element 0.1-25

The disadvantage of this active material is that it cannot be used for pumping nuclear reaction products, since it does not contain elements dividing by neurons.

The closest technical solution to the claimed active material is the active material POCl ₃ -SnCl ₄ -Nd ³⁺ -UO ² (RF Patent No. 2075143 dated 06/20/1994, IPC H01S 3/20. Dyachenko PP, Seregina EA , Tikhonov GV Active material for liquid lasers and amplifiers). The active material consists of the following ingredients, wt.%:

phosphorus oxotrichloride (POCl ₃ ) 60-98 tin tetrachloride (SnCl ₄ ) 1-20, neodymium 0.2-20 uranyl perchlorate UO ₂ (ClO ₄ ) ₂ 0,1-10

The disadvantages of the known active material are:

- a relatively wide luminescence line of the laser transition of 10–20 nm, which leads to a decrease in the stimulated emission cross section and to an increase in the threshold for the generation of liquid laser in comparison with laser in crystals.

- the active material for nuclear pumping should be prepared using a special technology, since it contains fissile material uranium-235.

The objective of the invention is to remedy these disadvantages, namely,

- obtaining an active material with a relatively narrow luminescence line of the laser transition, which leads to an increase in the stimulated emission cross section and to a decrease in the generation threshold of liquid laser;

- the exception of special operations with uranium-235.

To eliminate these drawbacks in the active material for liquid lasers and amplifiers based on phosphorus oksotrihlorida serves in the active material in place of the tin tetrachloride and perchlorate uranyl introduce boron trichloride BCl ₃ and trifluoroacetate neodymium Nd (CF ₃ CO _{2) 3.}

In special cases, the preparation of the active material is proposed:

- firstly, in the active material to provide the following ratio of ingredients, wt.%:

phosphorus oxotrichloride, POCl ₃ 85-98 boron trichloride, BCl ₃ 1-10 neodymium trifluoroacetate, Nd (CF ₃ CO ₂ ) ₃ 0.2-5

secondly, boron trichloride may contain an isotope ¹⁰ B in an amount of 20-95 wt.% of the total content of boron isotopes.

The technical result consists in increasing the output power of laser radiation and in reducing the cost of production.

In the active material, boron trichloride promotes the dissolution of neodymium trifluoroacetate in phosphorus oxotrichloride and together with it forms a matrix into which active neodymium ions are embedded. This matrix creates a favorable environment for luminescent neodymium ions, providing a small nonradiative dissipation of the excitation energy of these ions and weak concentration quenching of luminescence.

An example of a specific implementation of the active material

The active material POCl ₃ -BCl ₃ -Nd ^{3+ was} synthesized, containing in its composition a natural mixture of boron isotopes, in the following quantitative ratio of ingredients, in wt.%:

phosphorus oxotrichloride, POCl ₃ 90 boron trichloride, BCl ₃ 8 neodymium trifluoroacetate, Nd (CF ₃ COO) ₃ 2

10 samples were prepared from the active material, its spectral and luminescent characteristics were studied both under optical excitation and under neutron excitation conditions in a BARS-6 pulsed two-zone reactor at the SSC RF-IPPE.

The synthesized active material has the following characteristics:

luminescence decay time Nd ³⁺ , μs 200 luminescence bandwidth Nd ³⁺ by the laser transition ⁴ F _3/2 → ⁴ I _11/2 , nm 5.2 ± 0.1 laser stimulated emission cross section transition ⁴ F _3/2 → ⁴ I _11/2 , cm ² 1.5 · 10 ^-19 linear absorption coefficient at a wavelength laser transition 1053 nm, cm ^-1 3 · 10 ^-3

This active material has a 2.5-3.0 times smaller luminescence bandwidth of the Nd ³⁺ ion, corresponding to the laser transition ⁴ F _3/2 → ⁴ I _11/2 Δλ = 5.2 ± 0.2 nm, and therefore , a larger cross section for the stimulated emission of a given laser transition is σ _e = 1.5 · 10 ^-19 cm ² than in other laser fluids. An increase in the stimulated emission cross section leads to an increase in the gain and a significant increase in the pump efficiency of Nd ³⁺ . In addition, natural boron trichloride contains 20% of the ¹⁰ B isotope, the concentration of which can be increased to 95% when using boron trichloride enriched in the ¹⁰ B isotope. Due to the large cross section of the nuclear reaction ¹⁰ B (n, α) ⁷ Li, when neutron material in a nuclear reactor will be able to directly convert the energy of this nuclear reaction into laser radiation energy.

Claims (3)

1. Active material for liquid optical quantum generators and amplifiers based on phosphorus oxytrichloride, characterized in that the composition includes boron trichloride and neodymium trifluoroacetate Nd (CF ₃ CO ₂ ) ₃ . 2. The active material according to claim 1, characterized in that it contains, wt.%:
phosphorus oxotrichloride (POCl ₃ ) 85-98 boron trichloride (BCl ₃ ) 1-10 neodymium trifluoroacetate Nd (CF ₃ COO) ₃ 0.2-5.0 3. The active material according to claim 2, characterized in that the boron trichloride contains a ¹⁰ V isotope in an amount of 20-95 wt.% Of the total content of boron isotopes.