Wavelength stabilized light source

A wavelength stabilized light source comprising:

• a semiconductor laser for oscillating excitation light;
• a wavelength selecting element having a band pass characteristic that the transmissivity of specified wavelength light is increased;
• reflection means for applying optical feedback to the semiconductor laser through the wavelength selecting element;
• and
• an optical resonator containing a laser medium to be excited by excitation light and a nonlinear optical element for wavelength conversion,
• wherein the oscillation wavelength of the semiconductor laser is stabilized within the absorption spectrum of the laser medium.

A wavelength stabilized light source comprising:

• a first semiconductor laser for oscillating excitation light;
• a second semiconductor laser for oscillating mixing light;
• a wavelength selecting element having a band pass characteristic that the transmissivity of specified wavelength light is increased;
• an optical resonator containing a laser medium to be excited by excitation light and a nonlinear optical element for wavelength conversion;
• and
• reflection means for applying optical feedback to the first and second semiconductor lasers through the wavelength selecting element.

A wavelength stabilized light source comprising:

• a semiconductor laser for oscillating excitation light;
• a laser medium for emitting fundamental wave laser light by being excited by light of a predetermined wavelength within the range of wavelength of the excitation light;
• an optical resonator including the laser medium;
• a wavelength selecting element composed of polarization means and a birefringence element, the wavelength selecting element giving priority of transmission to the light of the predetermined wavelength of the excitation light;
• and
• reflection means for applying optical feedback to the semiconductor laser through the wavelength selecting element.

A wavelength stabilized light source comprising:

• a semiconductor laser for oscillating laser light;
• a nonlinear optical element for wavelength conversion of a laser light of a predetermined wavelength within the wavelength range of the laser light and emitting short wavelength laser light;
• a wavelength selecting element composed of polarization means and a birefringence element, the wavelength selecting element giving priority of transmission of the light of the predetermined wavelength of the laser light;
• and
• reflection means for applying optical feedback to the semiconductor laser through the wavelength selecting element.

A wavelength stabilized light source comprising:

• a semiconductor laser for oscillating excitation light;
• a laser medium for emitting fundamental wave laser light by being excited by light of a predetermined wavelength within the range of wavelength of the excitation light;
• a nonlinear optical element for converting the wavelength of the fundamental wave laser light and emitting short wavelength laser light;
• an optical resonator including the laser medium and the nonlinear optical element;
• a wavelength selecting element composed of polarization means and a birefringence element, the wavelength selecting element giving priority of transmission to the light of the predetermined wavelength of the excitation light;
• and
• reflection means for applying optical feedback to the semiconductor laser through the wavelength selecting element.

A wavelength stabilized light source comprising:

• a first semiconductor laser for oscillating excitation light;
• a second semiconductor laser for oscillating mixing light;
• a laser medium for emitting fundamental wave laser light by being excited by light of a predetermined wavelength within the range of wavelength of the excitation light;
• a nonlinear optical element for emitting laser light of a certain wavelength by mixing the fundamental wave laser light and the mixing light;
• an optical resonator including the laser medium and the nonlinear optical element;
• a wavelength selecting element composed of polarization means and a birefringence element, the wavelength selecting element giving priority of transmission to the light of the predetermined wavelength of the excitation light;
• and
• reflection means for applying optical feedback to the first semiconductor laser through the wavelength selecting element.

A wavelength stabilized light source comprising:

• a first semiconductor laser for oscillating excitation light;
• a second semiconductor laser for oscillating mixing light;
• a laser medium for emitting fundamental wave laser light by being excited by light of a predetermined wavelength within the range of wavelength of the excitation light;
• a nonlinear optical element for emitting laser light of a certain wavelength by mixing the fundamental wave laser light and the mixing light;
• an optical resonator including the laser medium and the nonlinear optical element;
• a wavelength selecting element composed of polarization means and a birefringence element, the wavelength selecting element giving priority of transmission to the light of the predetermined wavelength of the mixing light;
• and
• reflection means for applying optical feedback to the second semiconductor laser through the wavelength selecting element.

A wavelength stabilized light source comprising:

• a first semiconductor laser for oscillating excitation light;
• a second semiconductor laser for oscillating mixing light;
• a laser medium for emitting fundamental wave laser light by being excited by light of a first predetermined wavelength within the range of wavelength of the excitation light;
• a nonlinear optical element for emitting laser light of a certain wavelength by mixing light of a second predetermined wavelength within the range of wavelength of the mixing light and the fundamental wave laser light;
• an optical resonator including the laser medium and the non-linear optical element;
• a first wavelength selecting element composed of polarization means and a birefringence element, the first wavelength selecting element giving priority of transmission to the light of the first predetermined wavelength of the excitation light;
• first reflection means for applying optical feedback to the first semiconductor laser through the first wavelength selecting element;
• a second wavelength selecting element composed of polarization means and a birefringence element, the second wavelength selecting element giving priority of transmission to the light of the second predetermined wavelength of the excitation light;
• and
• second reflection means for applying optical feedback to the second semiconductor laser through the second wavelength selecting element.

A wavelength stabilized light source comprising:

• a semiconductor laser for oscillating fundamental light;
• a wavelength selecting element having a band pass characteristic that the transmissivity of specified wavelength light is increased;
• a nonlinear optical element for generating harmonic waves by converting the wavelength of a fundamental wave having passed through the wavelength selecting element;
• and
• fundamental wave reflection means for reflecting the fundamental wave passed through the nonlinear optical element and applying optical feedback to the semiconductor laser through the wavelength selecting element;
• and
• harmonic wave reflection means for superposing the harmonic waves generated by the nonlinear optical element in one direction.