A laser apparatus according to the present invention may comprise: a plurality of reflection mirrors which form a resonance path so as for light to be amplified by an induced emission; a medium having a first surface which forms a vertical surface with respect to the resonance path, and a second interface which does not form a vertical surface with respect to the resonance path, and absorbs energy from a light source and amplifies and emits the light; and a saturable absorber having a second surface which forms a vertical surface with respect to the resonance path, and a second interface which does not form a vertical surface with respect to the resonance path, and generates ultrashort pulses. The laser apparatus according to the present invention has the effects of cutting a saturable absorber having a specific crystallographic axis to thereby make polarization capacity in one direction advantageous and minimize propagation loss. In addition, the laser apparatus according to the present invention has the effect of maximizing transmittivity maintenance capacity of polarization orientation in one direction by arranging a medium and a saturable medium so as to have a specific inclined plane.

A fingerprint sensor-compatible overlay material which uses anisotropic conductive material to enable accurate imaging of a fingerprint through an overlay is disclosed. The anisotropic conductive material has increased conductivity in a direction orthogonal to the fingerprint sensor, increasing the capacitive coupling of the fingerprint to the sensor surface, allowing the fingerprint sensor to accurately image the fingerprint through the overlay. Methods for forming a fingerprint sensor-compatible overlay are also disclosed.

There is provided a photoacoustic measurement apparatus capable of appropriately detecting a single failure state even in the single failure state so that it is possible to prevent an operation in the single failure state from continuing. There are included: a laser light source having a flash lamp and a laser medium; an excitation light source power supply having a capacitor for supplying a charge voltage to the flash lamp, a charging circuit for charging the capacitor, a first voltage dividing circuit and a second voltage dividing circuit for dividing a voltage charged in the capacitor, and a failure detection circuit that detects a failure by comparing voltages obtained by voltage division of the first voltage dividing circuit and the second voltage dividing circuit; and an ultrasound probe that detects photoacoustic waves generated inside a subject by emission of light emitted from the laser light source to the subject.

There is provided a photoacoustic measurement apparatus capable of appropriately detecting a single failure state even in the single failure state so that it is possible to prevent an operation in the single failure state from continuing. There are included: a laser light source having a flash lamp and a laser medium; an excitation light source power supply having a capacitor for supplying a charge voltage to the flash lamp, a charging circuit for charging the capacitor, a first voltage dividing circuit and a second voltage dividing circuit for dividing a voltage charged in the capacitor, and a failure detection circuit that detects a failure by comparing voltages obtained by voltage division of the first voltage dividing circuit and the second voltage dividing circuit; and an ultrasound probe that detects photoacoustic waves generated inside a subject by emission of light emitted from the laser light source to the subject.

A pulse laser includes a laser medium, a charge storage unit, a power source unit configured to supply an electrical charge to the charge storage unit, an excitation unit configured to cause irradiation of the laser medium with excitation light onto the laser medium by being supplied the electrical charge stored in the charge storage unit, a switching unit configured to repeatedly supply the charge stored in the charge storage unit to the excitation unit, an energy monitoring unit configured to monitor energy stored in the charge storage unit, and a control unit configured to prevent the switching unit from supplying the electrical charge stored in the charge storage unit to the excitation unit when the energy monitored by the energy monitoring unit is larger than a threshold.

A pulse laser includes a laser medium, a charge storage unit, a power source unit configured to supply an electrical charge to the charge storage unit, an excitation unit configured to cause irradiation of the laser medium with excitation light onto the laser medium by being supplied the electrical charge stored in the charge storage unit, a switching unit configured to repeatedly supply the charge stored in the charge storage unit to the excitation unit, an energy monitoring unit configured to monitor energy stored in the charge storage unit, and a control unit configured to prevent the switching unit from supplying the electrical charge stored in the charge storage unit to the excitation unit when the energy monitored by the energy monitoring unit is larger than a threshold.

Provided is an apparatus for acquiring object information, the apparatus including: first and second laser output unit outputting first and second pulsed laser; a laser controlling unit configured to control each laser output unit; a first or second detecting unit configured to detect an emission timing of laser and output a first or second detection signal; a probe configured to receive an acoustic wave from an object being irradiated with the laser; and a signal processing unit configured to acquire specific information of the object, based on the acoustic wave. The laser controlling unit controls output of at least one of the laser output units so as to decrease a time difference between subsequent first and second pulsed lasers to be output.

A laser device according to the present invention may comprise: a pumping laser supply unit for emitting a pumping laser having a nano-second pulse width; and a laser output unit disposed at one side of the pumping laser supply unit and generating an output laser which is pumped by the pumping laser to have a nano-second pulse width corresponding to the pulse width of the pumping laser.

A laser device according to the present invention may comprise: a pumping laser supply unit for emitting a pumping laser having a nano-second pulse width; and a laser output unit disposed at one side of the pumping laser supply unit and generating an output laser which is pumped by the pumping laser to have a nano-second pulse width corresponding to the pulse width of the pumping laser.

A frequency-doubled laser, including: a first reflecting mirror, a second reflecting mirror, a gain medium, a telescope module, a polarizing element, and a nonlinear crystal; the first reflecting mirror and the second reflecting mirror are spaced apart to form a resonator of the frequency-doubled laser; the polarizing element, the gain medium, the telescope module, and the nonlinear crystal are located in the resonator, and the telescope module is located between the gain medium and the nonlinear crystal. The present disclosure further provides a method of generating harmonic laser. The frequency-doubled laser and the method of generating harmonic laser make the position of nonlinear crystal more flexible, and the possibility of damage to the nonlinear crystal is reduced.