Abstract: Systems and methods for providing a separate interest rate for an individual transaction are disclosed. A system may provide a service associated with a account having an account balance and an associated first interest rate. The system may include a service device having one or more memory devices storing instructions and one or more processors configured to execute the instructions to perform a separate interest rate service process. The process may include providing a separate interest rate service offer to a client device and receiving a separate interest rate selection from the client device. The process may also include determining a selected portion of the account balance corresponding to an amount to which a second interest rate, different from the first interest rate, is to be applied based on the separate interest rate selection.

Abstract: A frequency-converted laser apparatus includes an optical pumping source that produces fundamental laser radiation and an external resonant cavity having one beam path direction-marked frequency conversion crystal within said resonant cavity or just beam path direction-marked frequency conversion crystals without an additional resonant cavity. The “to-be-used” direction of said frequency conversion crystal is well defined or clearly marked. The frequency converted laser radiation after said frequency conversion crystal shows better beam quality and much higher power stability if said frequency conversion crystal is used in the “to-be-used” direction.

Abstract: A frequency-converted laser apparatus includes an optical pumping source that produces fundamental laser radiation and an external resonant cavity having one beam path direction-marked frequency conversion crystal within said resonant cavity or just beam path direction-marked frequency conversion crystals without an additional resonant cavity. The “to-be-used” direction of said frequency conversion crystal is well defined or clearly marked. The frequency converted laser radiation after said frequency conversion crystal shows better beam quality and much higher power stability if said frequency conversion crystal is used in the “to-be-used” direction.